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Pliocene short-term climate changes preserved in continental shallow lacustrine-palustrine carbonates: Western Opache Formation, Atacama Desert, Chile
Porosity In Microbial Carbonate Reservoirs in the Middle Triassic Leikoupo Formation (Anisian Stage), Sichuan Basin, China
Microbial carbonates developed in the Middle Triassic (Leikoupo Formation, Anisian Stage) of the western Sichuan Basin. The microbial components have been identified and include Renaclis-resembling , Rivularia lissaviensis , Carpathocodium anae , Hedstroemia moldavica , Bacinellacodium calcareus , and Paraortonella getica . These form stromatolitic, laminitic, thrombolitic, spongiostromata stones, dendrolites, and oncolitic structures. Microbial carbonate reservoirs occur in submember unit (SMU) 3-3 in the Zhongba area of the northern segment and SMU 4-3 in the middle segment of the western Sichuan Basin, both of which are of low porosity and permeability. Core descriptions and thin-section analysis show that reservoir porosity is mostly microbial coelom pores, framework pores, fenestral pores, and inter- and intraclot dissolved pores, within which the pores of ≥200 μm in diameter and throat of (40~50) μm are the most important. The SMU 4-3 microbial carbonate reservoirs are more thoroughly studied because of recent exploration activities, including the identification of three reservoir intervals. The middle reservoir interval, composed of thrombolitic and stromatolitic dolostone, hosts the reservoir of best quality. However, this high-quality interval loses effective porosity and thins to the northeast. It is proposed that extreme geological conditions, dolomitization, and burial dissolution influenced the development and distribution of the microbial carbonate reservoirs. The dolomitization process is thought to be penecontemporaneous to very early postdeposition. This early dolomitization contributed significantly to porosity of the microbial carbonate reservoirs and was likely enhanced through burial dissolution.
Permeability and acoustic velocity controlling factors determined from x-ray tomography images of carbonate rocks
PUNCTUATED GROWTH OF MICROBIAL CONES WITHIN EARLY CAMBRIAN ONCOIDS, BAYAN GOL FORMATION, WESTERN MONGOLIA
Deposition and Diagenesis of Marine Oncoids: Implications For Development of Carbonate Porosity
Abstract The great geological success in OGX's oil prospecting at the Albian-Cenomanian carbonate shelf on the southern Campos basin involves at least three different geologic components: (1) the appropriate geographic position of the traps within a low geopressure zone, away from the high pressure oil kitchen (external rift) and beyond the most prolific oil carrier bed of the Campos basin–the Cabo Frio fault system (Papa Terra, Maromba, Polvo and Peregrino oil fields and all of the discoveries made by OGX); (2) the Late Cretaceous and mainly early Tertiary magmatic events that contributed to the generation of an intensive and extensive high secondary porosity and increased permeability by thermobaric effects on the carbonate rocks; and (3) the presence of a high energy carbonate depositional system in the Quissamã Formation (Albian) and Imbetiba Formation (Cenomanian), which involves lateral accretion [e.g. , Pipeline (1-OGX-2A-RJS well), Waimea (1-OGX-3-RJS well), Etna (1-OGX-6-RJS well), Fuji (1-OGX-8-RJS well), Illimani (1-OGX-28D-RJS well), Peró (1-OGX-14-RJS well), and Tamborá (1-OGX-52-RJS well)] and vertical stacking [e.g., Waikiki (1-OGX-25-RJS well)] of thickening and shoaling upward carbonate depositional cycles. The oil accumulations in the Quissamã Formation are well defined by logs and pressure data (Pipeline, Etna, Illimani, Fuji, Waimea and Tambora wells) and are typically related to five tilted fault block trends (faults strike direction northeast/southwest), subparallel to the Cabo Frio fault system, all of which are filled to the spill-point, and each has a different oil/ water contacts. As a general rule the antithetic faults act as the major controlling seal for the oil accumulations in these three-way dip closure structures. The last successfully tested exploration model was a stratigraphic-structural trap formed by the updip pinch out of prograding carbonate shoals in the Imbetiba Formation relative to regional structural dip. This was drilled by the 1-OGX-14-RJS well (Peró Prospect) with an oil column of approximately 60 m based on pressures and well log data.