地质科学2024，Vol.59Issue(2)：330-340,11.DOI:10.12017/dzkx.2024.023
准噶尔盆地沙湾凹陷二叠系下乌尔禾组烃源岩类型与热演化研究
Research on the source rock types and thermal evolution of the Permian Lower Wuerhe Formation in the Shawan Sag,Junggar Basin
摘要
Abstract
The lower play in Shawan Sag is rich in oil and gas resources,and the Lower Wuerhe Formation has been proven to be the main source rock.However,the thermal evolution and hydrocarbon generation history of the source rock have not been clearly understood due to the deep burial and low research degree,which limits the understanding of the hydrocarbon migration and accumulation in lower play.Based on geochemistry data of source rock,the basic characteristic of the source rock is analyzed,and the thermal evolution and hydrocarbon generation history of the Lower Wuerhe Formation are reconstructed by basin modeling,and then the hydrocarbon accumulation process is preliminarily analyzed.The results show that the source rocks of the Lower Wuerhe Formation in the Shawan Sag are mainly Type Ⅱ organic matter,with an average organic carbon content of 0.82%and a potential hydrocarbon generation of 5.32 mg/g,which are medium source rocks.The current maturity is approximately 1.27%and they are in the mature to highly mature stage.The result of thermal evolution simulation shows that the source rocks entered the threshold of hydrocarbon generation(Ro = 0.5%)since the Late Triassic and reached the peak of oil generation(Ro = 1.0%)in the Jurassic-Late Cretaceous.After the end of the Cretaceous,the thermal evolution of organic matter entered a high maturity stage(Ro＞1.3%)and the kerogen was cracked to produce wet gas.The ultra-deep reservoir experiences multi-stage oil and gas charge,multi-stage mixed oil and gas charge and the fault differential activity result in the coexistence of multi-phase oil and gas reservoirs in different formations in the Shawan Sag.The research and understanding have established a strong basis for comprehending the mechanisms and procedures involved in the ultra-deep hydrocarbon accumulation within the Junggar Basin.关键词
烃源岩/热演化/生烃史/盆地模拟/沙湾凹陷Key words
Source rock/Thermal evolution/Hydrocarbon generation history/Basin modeling/Shawan Sag分类
天文与地球科学引用本文复制引用
曾治平,王金铎,李超,徐冰冰,范婕,刘德志,李松涛,张增宝..准噶尔盆地沙湾凹陷二叠系下乌尔禾组烃源岩类型与热演化研究[J].地质科学,2024,59(2):330-340,11.基金项目
中国石化科技部项目"准噶尔盆地腹部超深层P—T成储成藏机制及勘探方向"(编号:P22128)资助 （编号:P22128）
