... of economic importance that is the host reservoir for some of Canada’s largest conventional gas fields ( Morrow et al., 1990 ; Morrow and Aulstead, 1995; Hannigan et al., 2006 ). Other studies are devoted to the origin of specific stratigraphic units: such as Noble and Ferguson (1970) concerning...

... the main play in eastern Colorado. Southeastern Colorado was the site of significant exploration and development drilling in Pennsylvanian Morrow trends. A total of 56 new field wildcats marked a 47% increase in wildcat completions over the 38 new field wildcats of 1979. Weld County led completions...

... are extensively altered by the dolomitization process in the Kahi section, Nizampur Basin. The primary objective of this study is to investigate this multiphase dolomitization and to elucidate its possible mechanism. Field investigation shows both host limestone (oolitic, fossiliferous, and massive) and dolomites...

... wildcat wells in the Texas Panhandle was high, with ten new fields discovered, of which five were in Hansford County. One of these, the Twin field, produced the first Morrow oil in the Hansford County area. Also in 1954, gas production was established in the Stratford gas area (northwestern Sherman County...

.... twinned an old dry hole, 5.5 mi south of the Stockholm pool, at the 1 Evans “E” in Sec. 11, T16S, R43W. The well was completed for 82 BOPD and 528 MCFGD from the Morrow (5, Table 3 ), and was named Stockholm Southwest field. This is the first deep production in the county. Other production is from...

... Field, where the sub-surface structure has been worked out in as much detail as has been done in the Cushing Field. Indications of similar conditions from different places in Oklahoma and Kansas are so numerous however, that the mode of folding as demonstrated for the Cushing Field can be considered...

... ), kutnohorite [CaMn(CO 3 ) 2 ] (e.g., Frondel and Bauer 1955 ; Peacor et al. 1987 ), PbMg(CO 3 ) 2 ( Morrow and Ricketts 1986 ; Pimentel and Pina 2016 ), SrMg(CO 3 ) 2 ( Froese 1967 ), BaMn(CO 3 ) 2 ( Böttcher et al. 2012a , 2012b ; Schmidt et al. 2013 ), CdMg(CO 3 ) 2 ( Tareen et al. 1995 ; Bromiley...

... of calcite at distances <200–300 μm from the PSS. At greater distances, the gouge layers continued to deform mainly by twinning and fracturing. * E-mail: [email protected] . 3 5 2012 10 7 2012 15 7 2012 © 2012 Geological Society of America 2012 Our results suggest...

..., and bedding planes. The dolomite-limestone contacts are very sharp and generally cut primary features such as bedding planes and sedimentary structures ( Fig. 2B ). All of these features are commonly accepted as criteria for late diagenetic dolomitization (compare with Morrow et al. 1990 , Coniglio et al...

... pool produced 1,196 bbl of oil and approximately 3,597 mmcf of gas from the Morrow between 1956 and 1965. In Morton County west of the Hugoton gas area, the Wilburton field, which has a cumulative recovery of more than 10.6 million bbl of oil and 45.4 bcf of gas, continued to add new reserves...

... volcanic zone. (B) Major structural and tectonic elements and main oil/condensate accumulations in Taranaki Basin, including the Waihapa-Ngaere field (modified from King and Thrasher 1996 ). (C) Location and current status of the seven onshore wells providing core from the Tikorangi Formation...

... of closely spaced planar fractures. High-resolution electron backscatter diffraction mapping reveals that some of the planar microstructures in {112} contain deformation twin lamellae that range from 50 nm to 200 nm in width on the polished surface and occur in up to three crystallographic orientations...

... and questionably into the Black Hills of South Dakota. The Carmel-Twin Creek map is also extended, recent work having established the presence of Middle Jurassic and early Upper Jurassic beds over a larger area than that shown on previous maps. The sandstone facies of the Entrada becomes more shaly, silty...

... to the stress field that caused the twinning in the majority of grains in a given thin section. A high percentage of negative expected values (>40%) indicates that a second, non-coaxial twinning event occurred ( Teufel, 1980 ). Two twinning strains (PEV and NEV groups, respectively) can be analyzed...

... the Crossfield gas field trend in the Southern Alberta plains where the Crossfield Member forms a stratigraphic trap as it wedges out into the Stettler Formation. Figure 1. A. Map of study areas in Alberta (modified from Martindale et.al., 2004 ). This map also shows the general lithology distribution...

... with blue plastic. An inexpensive and clever solution to the problem of observing small pores through an optical microscope was devised by Canadian Hunter Exploration Ltd. ( Gies, 1987 ) for use on tight gas sandstones in the Elmworth field of Alberta. Instead of the blue coloration, a brightred...

... was completed flowing 11.3 MMCFGD (319,790 mVday) in the Atoka reservoir. These wells and other simultaneous Morrow completions of similar potential attracted considerable attention, and drilling activity in the area boomed. During the next 2 years, the field was rapidly developed, with 37 more wells...

... Ewing (1993) . A similar diagram can be drawn for Tarrant County, in the deepest part of the Fort Worth basin ( Figure 3 ). Although the Paleozoic is entirely covered there, abundant subsurface control shows Lower Cretaceous rocks (Twin Mountain and Travis Peak formations) resting on Strawn...

... a lacy-carbon copper grid. The TEM investigations were carried out at 200 kV with a FEI Tecnai F20 X-Twin instrument, equipped with a high-angle annular dark-field detector and an energy-dispersive X-ray spectrometer, which allowed for qualitative compositional analysis. At Les Pradals...