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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
DOI: 10.1306/10052321152
Characteristics and origin of the ultradeep Ordovician fault-karst reservoirs: An example from the Shunbei-Yuejin area, Tarim Basin
Jian Wang,1 Xintong Wang,2 Yingchang Cao,3 Fang Hao,4 Yuhan Pang,5 Lu Yun,6 Haijun Yang,7 and Mingfeng Xie8
1National Key Laboratory of Deep Oil & Gas, Qingdao, China; School of Geosciences, China University of Petroleum (East China), Qingdao, China; Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; [email protected]
2Department of Geology, School of Geosciences, China University of Petroleum (East China), Qingdao, China; [email protected]
3National Key Laboratory of Deep Oil & Gas, Qingdao, China; School of Geosciences, China University of Petroleum (East China), Qingdao, China; Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; [email protected]
4National Key Laboratory of Deep Oil & Gas, Qingdao, China; School of Geosciences, China University of Petroleum (East China), Qingdao, China; Chinese Academy of Sciences, Beijing, China; [email protected]
5CNPC Engineering Technology R&D Company, Beijing, China; [email protected]
6Northwest Oilfield of China Petrochemical Group, Urumqi, China; [email protected]
7PetroChina Tarim Oilfield Company, Korla, China; [email protected]
8Department of Geology, School of Geosciences, China University of Petroleum (East China), Qingdao, China; [email protected]
ABSTRACT
Fault-controlled reservoirs are critical hydrocarbon-bearing reservoirs in carbonate rocks. The ultradeep Ordovician fault-karst reservoirs in the Tarim Basin are representative carbonate reservoirs whose formation was controlled by tectonics. An integrated analysis of seismic, drilling, logging, and core data and the petrology and geochemistry of the area suggest that the strike-slip fault, lithology, and diagenetic fluids affected the size and formation of the fault-karst reservoirs. The meteoric water dissolution during episodes I–III in the middle Caledonian Orogeny was critical in the formation of the fault-karst reservoirs. In contrast, organic acid, magmatic-hydrothermal fluid, and Mg-rich high-salinity fluid had a negligible effect on the development of these reservoirs. The impact of meteoric water was likely limited in the strike-slip fault zone due to its short exposure time. The releasing bend, grainstone, and packstone were more conducive than the restraining bend, single fault, wackestone, and mudstone to the development of the fault core and fault damage zone in the strike-slip fault, resulting in meteoric water dissolution. The size of the fault-karst reservoir increased from south to north due to the onlap of Upper Ordovician strata in the north. The formation mechanism and development pattern of fault-karst reservoirs in the study area provide information for the analysis of carbonate reservoirs formed under similar conditions.
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