- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
North Africa
-
Egypt
-
Sinai Egypt (1)
-
-
Tunisia (1)
-
-
-
Asia
-
Arabian Peninsula
-
Oman
-
Oman Mountains (5)
-
-
Saudi Arabia (4)
-
United Arab Emirates
-
Abu Dhabi (1)
-
-
-
Far East
-
China
-
Xinjiang China
-
Tarim Basin (1)
-
-
Xizang China
-
Lhasa Block (1)
-
-
-
Japan (1)
-
-
Middle East
-
Iraq (3)
-
Israel (1)
-
Mesopotamia (2)
-
Turkey
-
Pontic Mountains (1)
-
-
-
Qiangtang Terrane (1)
-
-
Atlantic Ocean
-
North Atlantic
-
Georges Bank (1)
-
-
-
Canada
-
Western Canada
-
British Columbia
-
Vancouver Island (1)
-
-
-
-
Caribbean region
-
West Indies
-
Antilles
-
Greater Antilles
-
Cuba (4)
-
Jamaica (3)
-
Puerto Rico (2)
-
-
-
-
-
Chicxulub Crater (1)
-
Europe
-
Alps
-
Western Alps
-
Dauphine Alps
-
Vercors (2)
-
-
-
-
Central Europe
-
Austria
-
Tyrol Austria (1)
-
-
Switzerland (1)
-
-
Jura Mountains (1)
-
Pyrenees
-
Spanish Pyrenees (2)
-
-
Southern Europe
-
Greece (1)
-
Iberian Peninsula
-
Spain
-
Aragon Spain
-
Teruel Spain (1)
-
-
Basque Provinces Spain (1)
-
Cantabrian Basin (1)
-
Prebetic Zone (1)
-
Spanish Pyrenees (2)
-
Valencia region
-
Alicante Spain (1)
-
-
-
-
Italy
-
Apulia Italy (1)
-
Sardinia Italy (1)
-
-
-
Western Europe
-
France
-
Aquitaine Basin (1)
-
Charentes (1)
-
Dauphine Alps
-
Vercors (2)
-
-
Languedoc (1)
-
Pyrenees-Atlantiques France (2)
-
Var France (1)
-
-
Navarre (1)
-
United Kingdom
-
Great Britain
-
England (1)
-
-
-
-
-
Indian Ocean
-
Arabian Sea
-
Persian Gulf (2)
-
-
-
Mediterranean region (2)
-
Mexico
-
Baja California (3)
-
Chiapas Mexico (2)
-
Guerrero Mexico (2)
-
Guerrero Terrane (1)
-
San Luis Potosi Mexico (1)
-
Sonora Mexico (1)
-
Tamaulipas Mexico (1)
-
-
North America
-
Coast plutonic complex (1)
-
Great Plains (1)
-
Gulf Coastal Plain (3)
-
-
Pacific Ocean
-
East Pacific
-
Northeast Pacific (1)
-
-
North Pacific
-
Mid-Pacific Mountains (1)
-
Northeast Pacific (1)
-
Northwest Pacific
-
Wodejebato Seamount (1)
-
-
-
West Pacific
-
Northwest Pacific
-
Wodejebato Seamount (1)
-
-
-
-
Peninsular Ranges (1)
-
Sinai (1)
-
South America
-
Colombia (1)
-
-
United States
-
Alabama (1)
-
Arizona
-
Cochise County Arizona
-
Bisbee Arizona (1)
-
-
-
Arkansas (1)
-
Atlantic Coastal Plain (2)
-
California
-
Mendocino County California (1)
-
Orange County California (1)
-
Riverside County California (1)
-
Salinian Block (1)
-
San Diego County California (1)
-
Santa Barbara County California (1)
-
Ventura County California (1)
-
-
Eastern U.S. (1)
-
Florida (1)
-
Georgia (1)
-
Kansas (1)
-
Louisiana
-
Natchitoches Parish Louisiana (1)
-
-
Mississippi (1)
-
North Carolina (1)
-
South Carolina (1)
-
Texas
-
Comal County Texas (1)
-
Kimble County Texas (1)
-
Pecos County Texas (1)
-
Val Verde County Texas (1)
-
-
Washington (1)
-
-
-
commodities
-
energy sources (1)
-
oil and gas fields (6)
-
petroleum
-
natural gas (2)
-
-
-
elements, isotopes
-
carbon
-
C-13/C-12 (5)
-
organic carbon (1)
-
-
chemical ratios (3)
-
isotope ratios (6)
-
isotopes
-
stable isotopes
-
C-13/C-12 (5)
-
O-18/O-16 (4)
-
Sr-87/Sr-86 (2)
-
-
-
metals
-
alkaline earth metals
-
magnesium (1)
-
strontium
-
Sr-87/Sr-86 (2)
-
-
-
-
oxygen
-
O-18/O-16 (4)
-
-
phosphorus (1)
-
-
fossils
-
burrows (1)
-
Chordata
-
Vertebrata (1)
-
-
ichnofossils
-
Trypanites (1)
-
-
Invertebrata
-
Arthropoda
-
Mandibulata
-
Crustacea
-
Malacostraca
-
Brachyura (1)
-
-
Ostracoda (1)
-
-
-
-
Brachiopoda (2)
-
Cnidaria
-
Anthozoa (11)
-
-
Echinodermata
-
Crinozoa
-
Crinoidea (1)
-
-
Echinozoa
-
Echinoidea (3)
-
-
-
Mollusca
-
Bivalvia
-
Heterodonta
-
Hippuritacea
-
Radiolitidae (2)
-
-
Rudistae (78)
-
-
Ostreoidea
-
Ostreidae
-
Ostrea (1)
-
-
-
-
Cephalopoda
-
Ammonoidea
-
Ammonites (2)
-
-
-
Gastropoda (4)
-
-
Porifera
-
Demospongea (1)
-
Stromatoporoidea (1)
-
-
Protista
-
Foraminifera
-
Miliolina
-
Miliolacea
-
Miliolidae (1)
-
-
-
Rotaliina
-
Orbitoidacea
-
Orbitoididae (1)
-
-
-
Textulariina
-
Lituolacea
-
Orbitolinidae
-
Orbitolina (1)
-
-
-
-
-
-
Vermes (1)
-
-
microfossils (26)
-
palynomorphs
-
miospores
-
pollen (1)
-
-
-
Plantae
-
algae
-
calcareous algae (1)
-
Chlorophyta (1)
-
Coccolithophoraceae (1)
-
nannofossils (2)
-
Rhodophyta
-
Corallinaceae (1)
-
-
-
-
problematic fossils
-
Calcisphaerulidae (1)
-
-
thallophytes (1)
-
-
geochronology methods
-
paleomagnetism (1)
-
sclerochronology (1)
-
-
geologic age
-
Cenozoic
-
Tertiary
-
Neogene
-
Miocene
-
lower Miocene (1)
-
-
-
Paleogene
-
Eocene
-
middle Eocene
-
Lutetian (1)
-
-
-
Paleocene
-
lower Paleocene
-
K-T boundary (3)
-
-
-
-
-
-
Mesozoic
-
Cretaceous
-
Comanchean
-
Edwards Formation (1)
-
Glen Rose Formation (1)
-
-
Lower Cretaceous
-
Albian (13)
-
Aptian
-
lower Aptian (1)
-
Shuaiba Formation (6)
-
-
Barremian (8)
-
Berriasian (1)
-
Edwards Formation (1)
-
Glen Rose Formation (1)
-
Hauterivian (2)
-
Mural Limestone (3)
-
Sligo Formation (1)
-
Urgonian (3)
-
Valanginian (1)
-
-
Middle Cretaceous (9)
-
Natih Formation (2)
-
Upper Cretaceous
-
Campanian
-
lower Campanian (1)
-
-
Cenomanian (10)
-
Coniacian (3)
-
Gulfian
-
Prairie Bluff Chalk (1)
-
-
K-T boundary (3)
-
Maestrichtian
-
upper Maestrichtian (1)
-
-
Ripley Formation (1)
-
Rosario Formation (1)
-
Santonian (4)
-
Selma Group (1)
-
Senonian (20)
-
Smoky Hill Chalk Member (1)
-
Turonian (7)
-
-
-
Jurassic
-
Lower Jurassic
-
Toarcian (1)
-
upper Liassic (1)
-
-
Middle Jurassic
-
Bajocian (1)
-
-
Upper Jurassic (2)
-
-
upper Mesozoic (1)
-
-
-
metamorphic rocks
-
turbidite (2)
-
-
minerals
-
carbonates
-
aragonite (4)
-
calcite (6)
-
-
-
Primary terms
-
Africa
-
North Africa
-
Egypt
-
Sinai Egypt (1)
-
-
Tunisia (1)
-
-
-
Asia
-
Arabian Peninsula
-
Oman
-
Oman Mountains (5)
-
-
Saudi Arabia (4)
-
United Arab Emirates
-
Abu Dhabi (1)
-
-
-
Far East
-
China
-
Xinjiang China
-
Tarim Basin (1)
-
-
Xizang China
-
Lhasa Block (1)
-
-
-
Japan (1)
-
-
Middle East
-
Iraq (3)
-
Israel (1)
-
Mesopotamia (2)
-
Turkey
-
Pontic Mountains (1)
-
-
-
Qiangtang Terrane (1)
-
-
associations (1)
-
Atlantic Ocean
-
North Atlantic
-
Georges Bank (1)
-
-
-
biogeography (16)
-
biography (1)
-
Canada
-
Western Canada
-
British Columbia
-
Vancouver Island (1)
-
-
-
-
carbon
-
C-13/C-12 (5)
-
organic carbon (1)
-
-
Caribbean region
-
West Indies
-
Antilles
-
Greater Antilles
-
Cuba (4)
-
Jamaica (3)
-
Puerto Rico (2)
-
-
-
-
-
Cenozoic
-
Tertiary
-
Neogene
-
Miocene
-
lower Miocene (1)
-
-
-
Paleogene
-
Eocene
-
middle Eocene
-
Lutetian (1)
-
-
-
Paleocene
-
lower Paleocene
-
K-T boundary (3)
-
-
-
-
-
-
Chordata
-
Vertebrata (1)
-
-
climate change (1)
-
continental drift (2)
-
crust (1)
-
diagenesis (7)
-
economic geology (2)
-
energy sources (1)
-
Europe
-
Alps
-
Western Alps
-
Dauphine Alps
-
Vercors (2)
-
-
-
-
Central Europe
-
Austria
-
Tyrol Austria (1)
-
-
Switzerland (1)
-
-
Jura Mountains (1)
-
Pyrenees
-
Spanish Pyrenees (2)
-
-
Southern Europe
-
Greece (1)
-
Iberian Peninsula
-
Spain
-
Aragon Spain
-
Teruel Spain (1)
-
-
Basque Provinces Spain (1)
-
Cantabrian Basin (1)
-
Prebetic Zone (1)
-
Spanish Pyrenees (2)
-
Valencia region
-
Alicante Spain (1)
-
-
-
-
Italy
-
Apulia Italy (1)
-
Sardinia Italy (1)
-
-
-
Western Europe
-
France
-
Aquitaine Basin (1)
-
Charentes (1)
-
Dauphine Alps
-
Vercors (2)
-
-
Languedoc (1)
-
Pyrenees-Atlantiques France (2)
-
Var France (1)
-
-
Navarre (1)
-
United Kingdom
-
Great Britain
-
England (1)
-
-
-
-
-
faults (5)
-
folds (3)
-
geochemistry (3)
-
geophysical methods (1)
-
ichnofossils
-
Trypanites (1)
-
-
Indian Ocean
-
Arabian Sea
-
Persian Gulf (2)
-
-
-
Invertebrata
-
Arthropoda
-
Mandibulata
-
Crustacea
-
Malacostraca
-
Brachyura (1)
-
-
Ostracoda (1)
-
-
-
-
Brachiopoda (2)
-
Cnidaria
-
Anthozoa (11)
-
-
Echinodermata
-
Crinozoa
-
Crinoidea (1)
-
-
Echinozoa
-
Echinoidea (3)
-
-
-
Mollusca
-
Bivalvia
-
Heterodonta
-
Hippuritacea
-
Radiolitidae (2)
-
-
Rudistae (78)
-
-
Ostreoidea
-
Ostreidae
-
Ostrea (1)
-
-
-
-
Cephalopoda
-
Ammonoidea
-
Ammonites (2)
-
-
-
Gastropoda (4)
-
-
Porifera
-
Demospongea (1)
-
Stromatoporoidea (1)
-
-
Protista
-
Foraminifera
-
Miliolina
-
Miliolacea
-
Miliolidae (1)
-
-
-
Rotaliina
-
Orbitoidacea
-
Orbitoididae (1)
-
-
-
Textulariina
-
Lituolacea
-
Orbitolinidae
-
Orbitolina (1)
-
-
-
-
-
-
Vermes (1)
-
-
isotopes
-
stable isotopes
-
C-13/C-12 (5)
-
O-18/O-16 (4)
-
Sr-87/Sr-86 (2)
-
-
-
mantle (1)
-
maps (1)
-
marine installations (1)
-
Mediterranean region (2)
-
Mesozoic
-
Cretaceous
-
Comanchean
-
Edwards Formation (1)
-
Glen Rose Formation (1)
-
-
Lower Cretaceous
-
Albian (13)
-
Aptian
-
lower Aptian (1)
-
Shuaiba Formation (6)
-
-
Barremian (8)
-
Berriasian (1)
-
Edwards Formation (1)
-
Glen Rose Formation (1)
-
Hauterivian (2)
-
Mural Limestone (3)
-
Sligo Formation (1)
-
Urgonian (3)
-
Valanginian (1)
-
-
Middle Cretaceous (9)
-
Natih Formation (2)
-
Upper Cretaceous
-
Campanian
-
lower Campanian (1)
-
-
Cenomanian (10)
-
Coniacian (3)
-
Gulfian
-
Prairie Bluff Chalk (1)
-
-
K-T boundary (3)
-
Maestrichtian
-
upper Maestrichtian (1)
-
-
Ripley Formation (1)
-
Rosario Formation (1)
-
Santonian (4)
-
Selma Group (1)
-
Senonian (20)
-
Smoky Hill Chalk Member (1)
-
Turonian (7)
-
-
-
Jurassic
-
Lower Jurassic
-
Toarcian (1)
-
upper Liassic (1)
-
-
Middle Jurassic
-
Bajocian (1)
-
-
Upper Jurassic (2)
-
-
upper Mesozoic (1)
-
-
metals
-
alkaline earth metals
-
magnesium (1)
-
strontium
-
Sr-87/Sr-86 (2)
-
-
-
-
Mexico
-
Baja California (3)
-
Chiapas Mexico (2)
-
Guerrero Mexico (2)
-
Guerrero Terrane (1)
-
San Luis Potosi Mexico (1)
-
Sonora Mexico (1)
-
Tamaulipas Mexico (1)
-
-
North America
-
Coast plutonic complex (1)
-
Great Plains (1)
-
Gulf Coastal Plain (3)
-
-
Ocean Drilling Program
-
Leg 144
-
ODP Site 877 (1)
-
-
-
ocean floors (1)
-
oil and gas fields (6)
-
oxygen
-
O-18/O-16 (4)
-
-
Pacific Ocean
-
East Pacific
-
Northeast Pacific (1)
-
-
North Pacific
-
Mid-Pacific Mountains (1)
-
Northeast Pacific (1)
-
Northwest Pacific
-
Wodejebato Seamount (1)
-
-
-
West Pacific
-
Northwest Pacific
-
Wodejebato Seamount (1)
-
-
-
-
paleoclimatology (9)
-
paleoecology (21)
-
paleogeography (15)
-
paleomagnetism (1)
-
paleontology (5)
-
palynomorphs
-
miospores
-
pollen (1)
-
-
-
petroleum
-
natural gas (2)
-
-
phosphorus (1)
-
Plantae
-
algae
-
calcareous algae (1)
-
Chlorophyta (1)
-
Coccolithophoraceae (1)
-
nannofossils (2)
-
Rhodophyta
-
Corallinaceae (1)
-
-
-
-
plate tectonics (3)
-
problematic fossils
-
Calcisphaerulidae (1)
-
-
reefs (16)
-
sea-level changes (8)
-
sedimentary petrology (7)
-
sedimentary rocks
-
carbonate rocks
-
boundstone (2)
-
grainstone (3)
-
limestone
-
biocalcarenite (1)
-
micrite (2)
-
microbialite (2)
-
-
packstone (5)
-
rudstone (1)
-
wackestone (4)
-
-
chemically precipitated rocks
-
chert (2)
-
evaporites
-
salt (1)
-
-
-
clastic rocks
-
black shale (2)
-
conglomerate (3)
-
marl (1)
-
mudstone (4)
-
sandstone (2)
-
-
-
sedimentary structures
-
biogenic structures
-
algal structures (1)
-
bioherms (3)
-
carbonate banks (1)
-
oncolites (1)
-
stromatolites (1)
-
-
planar bedding structures
-
laminations (1)
-
ripple drift-cross laminations (1)
-
-
-
sedimentation (11)
-
sediments
-
carbonate sediments (1)
-
clastic sediments
-
clay (1)
-
-
-
South America
-
Colombia (1)
-
-
stratigraphy (14)
-
symposia (1)
-
tectonics
-
neotectonics (1)
-
-
thallophytes (1)
-
United States
-
Alabama (1)
-
Arizona
-
Cochise County Arizona
-
Bisbee Arizona (1)
-
-
-
Arkansas (1)
-
Atlantic Coastal Plain (2)
-
California
-
Mendocino County California (1)
-
Orange County California (1)
-
Riverside County California (1)
-
Salinian Block (1)
-
San Diego County California (1)
-
Santa Barbara County California (1)
-
Ventura County California (1)
-
-
Eastern U.S. (1)
-
Florida (1)
-
Georgia (1)
-
Kansas (1)
-
Louisiana
-
Natchitoches Parish Louisiana (1)
-
-
Mississippi (1)
-
North Carolina (1)
-
South Carolina (1)
-
Texas
-
Comal County Texas (1)
-
Kimble County Texas (1)
-
Pecos County Texas (1)
-
Val Verde County Texas (1)
-
-
Washington (1)
-
-
well-logging (2)
-
-
rock formations
-
Huqf Supergroup (1)
-
Mendez Formation (1)
-
Taylor Group (1)
-
-
sedimentary rocks
-
floatstone (1)
-
molasse (1)
-
oolite (1)
-
sedimentary rocks
-
carbonate rocks
-
boundstone (2)
-
grainstone (3)
-
limestone
-
biocalcarenite (1)
-
micrite (2)
-
microbialite (2)
-
-
packstone (5)
-
rudstone (1)
-
wackestone (4)
-
-
chemically precipitated rocks
-
chert (2)
-
evaporites
-
salt (1)
-
-
-
clastic rocks
-
black shale (2)
-
conglomerate (3)
-
marl (1)
-
mudstone (4)
-
sandstone (2)
-
-
-
siliciclastics (1)
-
turbidite (2)
-
-
sedimentary structures
-
burrows (1)
-
sedimentary structures
-
biogenic structures
-
algal structures (1)
-
bioherms (3)
-
carbonate banks (1)
-
oncolites (1)
-
stromatolites (1)
-
-
planar bedding structures
-
laminations (1)
-
ripple drift-cross laminations (1)
-
-
-
-
sediments
-
oolite (1)
-
sediments
-
carbonate sediments (1)
-
clastic sediments
-
clay (1)
-
-
-
siliciclastics (1)
-
turbidite (2)
-
Rudistae
Questioning carbonate facies model definition with reference to the Lower Cretaceous Urgonian platform (SE France Basin)
Taxonomy and paleobiogeography of rudist bivalves from Upper Cretaceous strata, Gulf Coastal Plain and Puerto Rico, USA
Review of the syn-rift to early post-rift depositional systems of the Cretaceous Mauléon rift: sedimentary record of continental crust hyperextension and mantle denudation (Western Pyrenees)
Large-scale vertical movements in Cenomanian to Santonian carbonate platform in Iberia: indicators of a Coniacian pre-orogenic compressive stress
ABSTRACT The Guerrero-Morelos carbonate platform (southwestern Mexico) is one of the rare platforms that persisted throughout the Cenomanian–Turonian oceanic anoxic event 2 (OAE 2). Two sections from this carbonate platform exhibit the typical δ 13 C positive excursion characterizing the OAE 2. This enables the precise distribution of larger benthic foraminifers and their biotic response to paleoenvironmental changes to be characterized during this event. At Axaxacualco, oligotrophic conditions prevailed during the δ 13 C positive excursion in the distal part of the carbonate platform. In the more proximal part, at Barranca del Cañon, OAE 2 impact was more significant and is marked by thick laminated microbialite deposition, indicating mesotrophic conditions. Low phosphorus and trace-element contents confirm the persistence of oligotrophic to mesotrophic conditions throughout OAE 2 in the Central Mexico carbonate platform despite the proximity of the Caribbean-Colombian oceanic plateau. Before the δ 13 C positive excursion, which characterizes the OAE 2, the microfauna assemblage was well diversified, including corals, rudists, and large benthic foraminifera ( Pseudorhapydionina chiapanensis , Pseudorhapydionina dubia , Cuneolina parva , Dicyclina sp., Chrysalidina gradata , and large miliolids). During the δ 13 C positive excursion, significant biotic changes occurred, with increasing dominance of organisms adapted to high-stress conditions. Endobenthic assemblages such as Nezzazatinella sp. and Nezzazata sp. were still present. The green symbiotic benthic foraminifera nearly disappeared, except C. parva and Dicyclina sp. During the basal Turonian, the carbonate platform returned to a more open and oxygenated environment, with the reappearance of pre-OAE microfauna, but without the large benthic foraminifera, which did not survive. The definitive drowning of the Guerrero-Morelos carbonate platform took place after the early Turonian, well above the end of the δ 13 C shift. The deposition of black shale and turbidites, which indicate deeper, anoxic environments, precluded large benthic foraminifera reestablishment. Correlation with the pelagic environments of the Eastbourne section (UK) reveals a synchronicity of biotic responses between basin and platform environments. Low-oxygen conditions are marked by multiple blooms of Heterohelix species in the basin, corresponding to an assemblage dominated by ? Decastronema , Thaumatoporella , and Istriloculina on the carbonate platforms.
SEQUENCE STRATIGRAPHIC AND PALEOECOLOGIC ANALYSIS OF AN ALBIAN CORAL-RUDIST PATCH REEF, ARIZONA, USA
Aptian carbonate platform development in the Southern Iberian Palaeomargin (Prebetic of Alicante, SE Spain)
Although carbonate reservoirs often have high total pore volumes, permeability often does not show a strong correlation to total porosity. Carbonate pore networks are also widely recognized as being highly heterogeneous, with marked variability in pore size (from submicron to millimeter scale and above) within an individual core plug. It is perhaps for this reason that there has been relatively little quantification of carbonate pore size and shape, despite significant advances in our ability to image naturally porous media using electron microscopy and advanced X-ray imaging. This study focuses on four samples of limestone from the uppermost Shuaiba Formation in northern Oman. These samples were selected for X-ray computerized tomography (CT) and environmental scanning electron microscope (ESEM) imaging and quantitative analysis following a detailed reservoir quality evaluation of the study interval across seven fields. This interval has been well studied sedimentologically, but the processes and timing of diagenetic modification, and the nature of the resultant pore network are less well understood. The samples represent a range of lithofacies associations that occur immediately beneath the Shuaiba–Nahr Umr unconformity, within an interval that is recognized for possessing higher permeability than the underlying reservoir. The samples were imaged at multiple scales, and their pore network was analyzed. Within the sample set, over 70% of the total pore volume was <1 μm in diameter. The three-dimensional (3D) equivalent pore radii within individual samples ranged from <0.1 μm to >100 μm, with the size of the X-ray imaged samples being limited to 1 mm 3 . The average aspect ratios of all pores was <2, and it was highest in micropores (<1 μm pore radii). Mean coordination number was <3 in all samples, and it was highest within micropores. Since most pore throat radii are <1 μm, this most likely reflects the higher resolution needed to image micropores. Multivariant analysis shows that permeability prediction is improved when pore topological parameters are known. The highest measured permeability within the data set occurred in the sample with the highest volume of resolved porosity, highest aspect ratio, and highest coordination number. However, average permeability overall was highest in those facies associations with abundant macropores, where the representative elemental volume is greater than the sample size required for X-ray CT analysis and even routine core analysis. In these samples, high permeability is facilitated by the connectivity of a low volume of large (>>30 μm) pores embedded within a network of micropores. In these samples, sweep efficiency during hydrocarbon production is likely to be poor. The results of this study provide one of the first detailed data sets of 3D pore shape and size within this volumetrically important reservoir and insight into pore connectivity within microporous reservoirs on the Arabian Plate. The results provide good evidence that the >1 μm fraction of these rocks contributes to single-phase flow, but they demonstrate the complexity of pore shape even at the micron scale.
Abstract: An integrated sedimentological and petrophysical approach was implemented to define the role of facies diversity and cyclicity on the reservoir quality of the Mishrif Formation in several oil fields in southern Iraq. The reservoir quality in most regressive cycles was enhanced upwards from deep-marine facies towards the shallower shelf-margin facies. The change in reservoir quality could be detected in the facies stacked systematically within the regressive cycles, which was also easily recognized using the porosity logs. The impact of early diagenetic overprints was quite obvious in developing both reservoir and non-reservoir rock types within the Mishrif Formation in the study area. A simple rock-typing nomenclature was proposed based on the available data in order to classify the existing reservoir (R) and non-reservoir (S) rock types. The best-recognized reservoir rock types were rudistid microfacies with grain-dominated fabrics (including both grainstone (R1) and grain-dominated packstone (R2)), which were subjected to an early diagenetic dissolution process, usually located beneath discontinuity surfaces. Such reservoir units or rock types have a regional extent within the southern Mesopotamian Basin, as they have often developed during the Mishrif shelf-margin progradation. In addition, the other important reservoir rock type was a microbialite (i.e. peloidal mud-dominated packstone (R3)), which was additionally characterized by micropores within the mud-dominated portion of the facies. However, owing to the variable intensity of the diagenetic effects and differences in the depositional texture components, the reservoir quality in this rock type could vary regionally. The regional distribution of the rudistid grainstone and grain-dominated packstone reservoir rock types (R1 and R2) was mostly related to the palaeogeographical highs that existed during deposition. However, such reservoir rock types could pinch out within the depositional sequences, showing their potential to become stratigraphic traps outside the structural crest of the field. The delineation of the reservoir rock types within a sequence-stratigraphic framework can be quite beneficial for reservoir prediction and exploration within and outside of the field.
Campanian and Maastrichtian plagioptychid rudists (Hippuritida, Bivalvia) of the Chiapas Central Depression, southern Mexico
Calcite/aragonite ratio fluctuations in Aptian rudist bivalves: Correlation with changing temperatures
Ground-penetrating radar imaging of Albian rudist buildups, central Texas
Rudist bivalves and the Pacific in the Late Jurassic and Early Cretaceous
Sedimentological characterization of the mid-Cretaceous Mishrif reservoir in southern Mesopotamian Basin, Iraq
Toarcian and Bajocian ammonites from the Haushi-Huqf Massif of southwestern Oman and the Hawasina Nappes of the Oman Mountains: Implications for paleoecology and paleobiogeography
A New Early Campanian Rudist Fauna from San Luis Potosi in Mexico and its Taxonomic and Stratigraphic Significance
RUDISTS OF TIBET AND THE TARIM BASIN, CHINA: SIGNIFICANCE TO REQUIENIIDAE PHYLOGENY
SYSTEMATIC AND BIOSTRATIGRAPHIC SIGNIFICANCE OF THE AMERICAN RUDIST BIVALVE DURANIA AGUILAE ADKINS, 1930
An appreciation of Lawrence John Chubb (1887–1971), stratigrapher, educator, and historian of Jamaican geology
After service in the Great War, Lawrence John Chubb (1887–1971) entered University College London at the late age of 31 and remained there, as a student and, subsequently, staff member for 30 years. At this time Chubb's research interests were British Paleozoic stratigraphy and the geology of the Pacific islands. He retired in 1950 and joined the new Geological Survey Department of Jamaica as a geologist, later becoming deputy director (1957) and acting director (1961–1963). Chubb developed a new research program on the Cretaceous of Jamaica and the tropical Americas, with specialist expertise in the systematics of the rudist bivalves. He also founded and led the Jamaica Group of the Geologists' Association in 1955, which became the Geological Society of Jamaica in 1960; he was the first president of both organizations. He was the first historian of the geology of Jamaica, and wrote accessible biographies of De la Beche, Barrett, and Zans, the latter co-authored with John Williams, all of which are reproduced in the present volume.