Petroleum Science >2020,??Issue 6:??- DOI: https://doi.org/10.1007/s12182-020-00487-1
Hydrocarbon generation from lacustrine shales with retained oil during thermal maturation
Open?Access
文章信息
pdf下載
作者：Xin-He Shao, Xiong-Qi Pang, Mao-Wen Li, Zhi-Ming Li & Yi Zhao
作者單位：
Affiliations
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, China
Xin-He Shao, Xiong-Qi Pang & Yi Zhao
College of Geosciences, China University of Petroleum, Beijing, 102249, China
Xin-He Shao, Xiong-Qi Pang & Yi Zhao
State Key Laboratory of Shale Oil and Shale Gas Resources and Effective Development, SINOPEC Petroleum Exploration and Production Research Institute, Beijing, 100083, China
Mao-Wen Li
SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi Institute of Petroleum Geology, Wuxi, 214126, Jiangsu, China
Mao-Wen Li & Zhi-Ming Li
Corresponding author
Correspondence to Xiong-Qi Pang.
投稿時間：2020-9-4
引用方式：Shao, X., Pang, X., Li, M. et al. Hydrocarbon generation from lacustrine shales with retained oil during thermal maturation. Pet. Sci. (2020). https://doi.org/10.1007/s12182-020-00487-1
文章摘要
Thermal maturation in the shale oil/gas system is inherently complex due to the competitive interplays between hydrocarbon generation and retention processes. To study hydrocarbon generation characteristics from shales within different stages of thermal maturation under the influence of retained oil, we performed Micro-Scale Sealed Vessels (MSSV) pyrolysis on a set of artificially matured lacustrine shale samples from the Shahejie Formation in the Dongpu Depression in Bohai Bay Basin, China. Experimental results show that hydrocarbon yields of shale samples with or without retained oil at various thermal maturities follow different evolution paths. Heavy components (C15+) in samples crack at high temperatures and generally follow a sequence, where they first transform into C6–14 then to C2–5 and C1. Methane accounts for most of the gaseous products at high temperatures in all samples, with different origins. The cracking of C2–5 is the main methane-generating process in samples with retained oil, whereas the source of methane in samples without retained oil is kerogen. In the studied shales, retained oils at early-mature stage retard the transformation of liquid to gaseous hydrocarbon and prompt the cracking of C2–5 to C1 to some extent. TSR reaction related to gypsum in the studied samples is the primary reason that can explain the loss of hydrocarbon yields, especially at high temperatures. In addition, transformation of volatile hydrocarbons to gas and coke also accounts for the loss of generated hydrocarbon, as a secondary factor.
