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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
DOI: 10.1306/12202221020
Evolution of pore space in tight sandstone: The roles of dissolution, calcite cementation, and clay growth
Nengwu Zhou,1 Min Wang,2 Shuangfang Lu,3 Wei Liu,4 Ying Guan,5 and Changqi Yu6
1Sanya Offshore Oil & Gas Research Institute, Northeast Petroleum University, Sanya, People’s Republic of China; [email protected]
2Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, People’s Republic of China; [email protected]
3Sanya Offshore Oil & Gas Research Institute, Northeast Petroleum University, Sanya, People’s Republic of China; [email protected]
4Research Institute of Zhanjiang Company, China National Offshore Oil Corporation (CNOOC), Zhanjiang, Guangdong, People’s Republic of China; [email protected]
5CNOOC Gas & Power Group Co., Ltd., Beijing, People’s Republic of China; [email protected]
6Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, People’s Republic of China; [email protected]
Abstract
Pore space transforms through mineral precipitation and dissolution, providing insights into the dynamic changes in the pore structure of rocks over time. In this paper, we quantified the levels in the diagenetic alteration of tight sandstone in the Qingshankou Formation from the Upper Cretaceous in the Songliao Basin and illustrated the evolutionary processes of pore type and pore size distribution, along with porosity and permeability, with dissolution, calcite cementation, and clay growth. More important, we investigated the microscopic observation and pore size distribution of sandstone exhibiting varying levels of dissolution, calcite cementation, and clay growth and found that mineral precipitation and dissolution were inhibited in pores
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