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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
DOI: 10.1306/03052418150
Impact of CO2 influx on sandstone reservoir quality: A case study of the Quantou Formation, southern Songliao Basin, China
Zheng Cao,1 Chengyan Lin,2 Chunmei Dong,3 Lihua Ren,4 Keyu Liu,5 Karem Azmy,6 Hairuo Qing,7 and Jason Cosford8
1Geology Key Laboratory of Shandong Province, Qingdao, Shandong, China; National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, Shandong, China; Research Laboratory of China University of Petroleum (East China), Key Laboratory of Oil and Gas Reservoir, Qingdao, Shandong, China; School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong, China; School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing, China; Department of Geology, University of Regina, Regina, Saskatchewan, Canada; [email protected]
2Geology Key Laboratory of Shandong Province, Qingdao, Shandong, China; National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, Shandong, China; Research Laboratory of China University of Petroleum (East China), Key Laboratory of Oil and Gas Reservoir, Qingdao, Shandong, China; School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong, China; [email protected]
3Geology Key Laboratory of Shandong Province, Qingdao, Shandong, China; National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, Shandong, China; Research Laboratory of China University of Petroleum (East China), Key Laboratory of Oil and Gas Reservoir, Qingdao, Shandong, China; School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong, China; [email protected]
4Geology Key Laboratory of Shandong Province, Qingdao, Shandong, China; National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, Shandong, China; Research Laboratory of China University of Petroleum (East China), Key Laboratory of Oil and Gas Reservoir, Qingdao, Shandong, China; School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong, China; [email protected]
5Geology Key Laboratory of Shandong Province, Qingdao, Shandong, China; National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, Shandong, China; Research Laboratory of China University of Petroleum (East China), Key Laboratory of Oil and Gas Reservoir, Qingdao, Shandong, China; School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong, China; [email protected]
6Department of Earth Sciences, Memorial University of Newfoundland, St. John’s, Newfoundland, Canada; [email protected]
7Department of Geology, University of Regina, Regina, Saskatchewan, Canada; [email protected]
8Department of Geology, University of Regina, Regina, Saskatchewan, Canada; [email protected]
ABSTRACT
The CO2-gas reservoirs have been recorded in many petroliferous basins worldwide. However, the impact of deep inorganic CO2 influx on reservoir quality has received little attention. Here, a new set of mineralogical and geochemical data collected from the Lower Cretaceous Quantou Formation sandstones in the southern Songliao Basin are presented to address this issue. The sandstones were broadly subdivided into two zones based on their mineralogical compositions: (1) a normal zone with higher porosity (average 13.7%) and permeability (average 3.27 md) that is located >10 km from the Gudian fault (composed of ferrocalcite, ankerite, quartz, mixed-layer illite/smectite (I/S), kaolinite, illite, and chlorite); and (2) a dawsonite-bearing zone with relatively poor reservoir quality (average 10.1% and 0.4 md) adjacent to the Gudian fault (consisting of dawsonite, ankerite, quartz, I/S, and illite). The carbon sources for dawsonite and ankerite in the dawsonite-bearing zone (δ13C = −5.7‰ to −0.8‰ and δ18O = −20.6‰ to −17.1‰, and Sr = 0.710216–0.712472) are mostly a mix of mantle magmatic CO2 and crustal CO2, with a small amount of organic CO2, which is the opposite of that for the ferrocalcite and ankerite in the normal zone (δ13C = −10.5‰ to −2.3‰, δ18O = −19.3‰ to −14.9‰, and Sr = 0.712060–0.714030). Observations of the dawsonite-bearing zone demonstrate higher contents of carbonate and quartz cements, specific clay mineral types (mixed-layer I/S with Reichweite order of R = 3 and illite), and poor reservoir quality and oil productivity due to the influx of deep inorganic CO2 dating to circa 65–44 Ma.
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