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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
DOI: 10.1306/01202218109
Identifying the key source rocks in heterogeneous saline lacustrine shales: Paleogene shales in the Dongpu depression, Bohai Bay Basin, eastern China
Tao Hu,1 Xiongqi Pang,2 Tianwu Xu,3 Changrong Li,4 Shu Jiang,5 Qifeng Wang,6 Yuanyuan Chen,7 Hongan Zhang,8 Chuang Huang,9 Shuangyi Gong,10 and Zhongchen Gao11
1State Key Laboratory for Petroleum Resources and Prospecting, Beijing, China; Basin and Reservoir Research Center, College of Geosciences, China University of Petroleum (Beijing), Beijing, China; [email protected]; [email protected]
2State Key Laboratory for Petroleum Resources and Prospecting, Beijing, China; Basin and Reservoir Research Center, College of Geosciences, China University of Petroleum (Beijing), Beijing, China; [email protected]
3Research Institute of Exploration and Development, Zhongyuan Oilfield Company, Sinopec, Zhengzhou, Henan, China; [email protected]
4State Key Laboratory of Petroleum Resources and Prospecting, Beijing, China; College of Geosciences, China University of Petroleum (Beijing), Beijing, China; [email protected]
5Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan, Hubei, China; [email protected]
6Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China; [email protected]
7State Key Laboratory for Petroleum Resources and Prospecting, Beijing, China; Basin and Reservoir Research Center, College of Geosciences, China University of Petroleum (Beijing), Beijing, China; [email protected]
8Zhongyuan Oilfield Company, Sinopec, Puyang, Henan, China; [email protected]
9Research Institute of Exploration and Development, Yanchang Oilfield Company, Yanan, Shanxi, China; [email protected]
10State Key Laboratory for Petroleum Resources and Prospecting, Beijing, China; Basin and Reservoir Research Center, College of Geosciences, China University of Petroleum (Beijing), Beijing, China; [email protected]
11Petroleum Exploration and Production Research Institute, Jianghan Oilfield, Wuhan, Hubei, China; [email protected]
Abstract
Extensive, thick, and heterogeneous lacustrine shales occur globally with some regarded as source rocks, but which facies are the key contributors remains unclear. Previous studies have considered that all of the heterogeneous shales were source rocks in the Dongpu depression, but exploration does not support this assumption. Based on 40 yr of geochemical data collection, this study investigated the hydrocarbon generation and expulsion potential of these shales. The results show that laminated shales, though relatively limited in thickness and area, contain much higher organic matter contents and more oil-prone organic matter. Thermal simulation analysis shows that hydrocarbon generation and expulsion potential of laminated shales are much higher and more favorable for hydrocarbon expulsion. Oil-source correlation analyses between oil and shales indicate that northern oils feature pristane/phytane ratios (Pr/Ph) less than 0.7, gammacerane (gammacerane/C30-hopane) indices greater than 0.5, and L-shaped distributions of ααα-C27-20R, ααα-C28-20R, and ααα-C29-20R regular steranes, and are similar to the biomarker characteristics of northern laminated shales with total organic carbon (TOC) contents greater than 1 wt. %. In contrast, northern massive shales are characterized by a high Pr/Ph and low gammacerane index. Southern oils feature Pr/Ph greater than 0.7, gammacerane indices less than 0.5, and L-shaped distributions of regular steranes that are similar to the biomarker characteristics of southern laminated shales. Southern massive shales were characterized by high Pr/Ph, low gammacerane indices, and reversed L- and V-shaped distributions. Laminated shales with TOC contents greater than 1 wt. % are the key source rocks in these heterogeneous Paleogene shales.
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