Effects of the Sedimentary Environment on Organic-Rich Shale in the Intracratonic Sag of the Sichuan Basin, China
Source abstract
Abstract
The enrichment of organic matter in high-quality marine shale is generally controlled by factors such as the redox conditions of sedimentary environments, productivity levels, terrigenous input, and ancient productivity. However, the controlling effect of the sedimentary environment on organic matter enrichment in intracratonic sag is still unclear. This study takes samples from the Qiongzhusi formation shale in southern Sichuan Basin as the research object, focusing on trace elements as well as rare earth elements in different stratigraphic intervals. The provenance of the Qiongzhusi formation shale is mainly terrigenous, with sediment sources mainly consisting of sedimentary rocks and granites. The primary sedimentary environment transitions from a continental margin setting, influenced by rift-related tectonic activity and sediment influx from adjacent landmasses, to an open oceanic environment characterized by mid-ocean ridge processes and oceanic plate subduction zones. During sedimentation, saline water was present, with predominant sedimentary environments ranging from shallow water to deep water continental shelves. The shale in the study area is characterized by a higher content of silicates and a lower content of carbonate minerals. Its siliceous sources are mainly influenced by biogenic and terrigenous debris, indicating higher ancient primary productivity and representing a favorable target for shale gas exploration.
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Research context
OpenAlex topics: Hydrocarbon exploration and reservoir analysis · Methane Hydrates and Related Phenomena · Geological and Geophysical Studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Shale Gas Research Institute of Petrochina Southwest Oil & Gas Field Company, Chengdu 610051, China
Sichuan Provincial Key Laboratory of Shale Gas Evaluation and Exploitation, Chengdu 610051, China
National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610051, China
School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610051, China
State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, China
Funding
China Petroleum Natural Gas Group Co. Ltd. Science and Technology Project entitled ‘The new layer of favorable area optimization and exploration evaluation of key technology research’ · PetroChina Southwest Oil and Gas Field Company entitled ‘Research on the enrichment law of shale gas in the Qiongzhusi Formation of the Deyang Anyue Rift Trough’ · China National Petroleum Corporation Gas Reservoir Evaluation Project entitled ‘Characterization of the Paleogeomorphology of the Qiongzhusi Formation Shale in the Middle Section of the Deyang Anyue Rift Trough and Comprehensive Evaluation of Favorable Areas’ · National Natural Science Foundation of China project ‘Surface Properties of Deep Shale Nano-Pore Media and Confinement Effects on Fluid Occurrence’
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