Sedimentary environment and organic matter enrichment of marine-continental transitional shale in the Shanxi-Taiyuan Formations in western Linqing Depression, Bohai Bay Basin, China
WANG Yang1,2, ZHANG Hanyu1,2, ZHU Yanming1,2, QIN Yong1,2, CHEN Shangbin1,2, WANG Zhixuan1,2, CAO Wan1,2
1 China University of Mining and Technology,Key Laboratory of Coalbed Methane Resources & Reservoir Formation Process,Ministry of Education,Jiangsu Xuzhou 221008, China; 2 China University of Mining and Technology,School of Resources and Geosciences,Jiangsu Xuzhou 221116, China
Abstract The exploration and development of marine-continental transitional shale gas is in the primary stage. The Shanxi-Taiyuan Formations shale has good hydrocarbon generation potential and is also an important horizon for the development of marine-continental transitional shale gas in China. In order to explore the relationship between sedimentary environment and organic matter enrichment of the Shanxi-Taiyuan Formations shale in the western Linqing Depression,Bohai Bay Basin,Well XJ1 was investigated in detail by means of petrology,organic geochemistry,element geochemistry and numerical analysis. The results show that the Shanxi-Taiyuan Formations shale is characterized by a low content of brittle minerals,a high content of clay minerals and a high resistance to hydraulic fracturing. It is also found that the Shanxi-Taiyuan Formations shale comprises a high-quality source rock with an average TOC content of 4.03%,which has the potential for shale gas exploration and development. During the deposition of the Taiyuan Formation mudstone/shale,the study area featured an anoxic,moderately stagnant oceanic environment under a warm and humid climate,with frequent variaions in terrigenous debris influx,low deposition rate and low to medium paleoproductivity level. During the deposition of the Shanxi Formation mudstone/shale,the study area featured anoxic,moderately to strongly stagnant and brackish to brine seawater under complex and ever-changing paleoclimatic conditions,with a stable and high terrigenous debris influx,medium deposition rate and medium to high paleoproductivity level. Given the linear correlation,grey correlation and robust regression analysis between paleoenvironmental conditions and TOC content,it is concluded that the enrichment of organic matter in the Taiyuan shale is mainly controlled by paleoclimate,paleoredox and ancient water salinity conditions,while the enrichment of organic matter in the Shanxi shale is mainly controlled by paleoclimate and terrigenous debris input conditions.
Fund:National Natural Science Foundation of China(Nos. 42172156,41802183,42030810)and the Talent Cultivation Project of China University of Mining and Technology(No.2022YCPY0201)
About author: WANG Yang, born in 1989,is an associate professor,doctoral supervisor,and the associate director of School of Resources and Geosciences,China University of Mining and Technology. His main research direction is coalbed methane and shale gas geology. E-mail: wangycumt@163.com.
Cite this article:
WANG Yang,ZHANG Hanyu,ZHU Yanming et al. Sedimentary environment and organic matter enrichment of marine-continental transitional shale in the Shanxi-Taiyuan Formations in western Linqing Depression, Bohai Bay Basin, China[J]. JOPC, 2024, 26(5): 1090-1107.
WANG Yang,ZHANG Hanyu,ZHU Yanming et al. Sedimentary environment and organic matter enrichment of marine-continental transitional shale in the Shanxi-Taiyuan Formations in western Linqing Depression, Bohai Bay Basin, China[J]. JOPC, 2024, 26(5): 1090-1107.
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