Differential enrichment mechanisms of organic matter in middle-upper Triassic lacustrine mudstone,north Kuqa depression(Tarim Basin,China):An integrated approach utilizing inorganic and organic geochemical evidenceOA
The Kuqa Depression,recognized as one of the best hydrocarbon-enriched depressions within the Tarim Basin,has long been debated regarding its principal source intervals,which has restricted petroleum exploration and development in this area.This study focuses on the hydrocarbon source rocks of the Middle-Upper Triassic Karamayi Formation and Upper Triassic Huangshanjie Formation in the northern part of the Kuqa Depression through a comprehensive organic and elemental investigation.The examinations indicate that the source rocks of the Karamayi Formation-Huangshanjie Formation are dark mudstones developed in a lacustrine setting.The organic matter abundance generally ranges from fair to good.The organic matter type is mainly TypeⅡ,with a portion being TypeⅢ,and the source rocks have reached a mature stage.During the depositional period of the source rocks in the Karamayi Formation,variations in paleoproductivity,characteristics of ancient water bodies and intensity of hydrothermal activity together influenced the organic matter enrichment model of the Misbrac section,which is controlled by preservation conditions and paleoproductivity.In contrast,the Heiyingshan and Kuqa River sections exhibit paleoproductivity-dominated enrichment mechanisms.During the depositional period of the Huangshanjie Formation,the organic matter enrichment model in the study area is controlled by both the preservation conditions and paleoproductivity.
Dejiang Li;Qun Zhao;Lingyu Zhao;Yanpeng Chen;Ze Deng;Xiangchun Chang;Bingbing Shi;Runye Han;Shangbin Wang
Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China Key Laboratory of Coal-Rock Gas,CNPC,Hebei Langfang 065007,China National Energy Shale Gas R&D(Experiment)Center,Hebei Langfang 065007,ChinaResearch Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China Key Laboratory of Coal-Rock Gas,CNPC,Hebei Langfang 065007,China National Energy Shale Gas R&D(Experiment)Center,Hebei Langfang 065007,ChinaCollege of Earth Sciences&Engineering,Shandong University of Science and Technology,Qingdao 266590,ChinaResearch Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China Key Laboratory of Coal-Rock Gas,CNPC,Hebei Langfang 065007,China National Energy Shale Gas R&D(Experiment)Center,Hebei Langfang 065007,ChinaResearch Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China Key Laboratory of Coal-Rock Gas,CNPC,Hebei Langfang 065007,China National Energy Shale Gas R&D(Experiment)Center,Hebei Langfang 065007,ChinaCollege of Earth Sciences&Engineering,Shandong University of Science and Technology,Qingdao 266590,ChinaCollege of Earth Sciences&Engineering,Shandong University of Science and Technology,Qingdao 266590,ChinaCollege of Earth Sciences&Engineering,Shandong University of Science and Technology,Qingdao 266590,ChinaCollege of Earth Sciences&Engineering,Shandong University of Science and Technology,Qingdao 266590,China
天文与地球科学
Organic matter enrichmentLacustrine source rocksMain controlling factorsTarim Basin
《Acta Geochimica》 2026 (2)
P.422-438,17
National Natural Science Foundation of China,no.42072172,Xiangchun Chang,no.42372160,Xiangchun Chang。
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