武威盆地儿马湖凹陷构造演化与热史模拟  

Tectonic Evolution and Thermal History Simulation of Ermahu Sag,Wuwei Basin

作　　者：雒春雨 宋立军 杨浩 史婵媛[4] 张欢 LUO Chunyu;SONG Lijun;YANG Hao;SHI Chanyuan;ZHANG Huan(School of Earth Science and Engineering,Xi'an Shiyou University,Xi'an 710065,Shaan Xi,China;Shaanxi Provincial Key Laboratory of Oil and Gas Accumulation,Xi'an Shiyou University,Xi'an 710065,ShaanXi,China;Central South Bureau,General Administration of Metallurgy and Geology of China,Wuhan 430081,Hubei,China;Research Institute of Exploration and Development,Changqing Oilfield Company,Xi'an 710018,ShaanXi,China)

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]陕西省油气成藏重点实验室,陕西西安710065 [3]中国冶金地质总局中南局,湖北武汉430081 [4]长庆油田分公司勘探开发研究院,陕西西安710018

出　　处：《西北地质》2022年第4期194-203,共10页Northwestern Geology

基　　金：西安石油大学研究生创新实践资助项目(YCS19112023)资助。

摘　　要：儿马湖凹陷位于武威盆地北部凹陷西部的一个次级构造单元,该凹陷石炭系煤系地层发育,有一定油气勘探潜力。笔者利用平衡剖面技术和盆地成藏模拟技术,对该地区的构造演化和热史进行了研究。研究揭示:(1)儿马湖凹陷为一个受多条北东向正断层控制发育的复式断陷;(2)该凹陷经历了4个阶段:石炭纪—二叠纪裂陷阶段、三叠纪—早中侏罗世抬升剥蚀阶段、晚侏罗世—白垩纪二次裂陷阶段和古近纪—新近纪—第四纪坳陷阶段。(3)儿马湖凹陷石炭系烃源岩热演化程度较高,二叠纪末期进入生油阶段,三叠纪末期已经进入生气阶段,现今整体处于高成熟-过成熟阶段。本研究对该凹陷、武威盆地及走廊盆地形成演化认识和油气勘探具有一定参考价值。Ermahu depression is located in a secondary structural unit in the west of the northern depression of Wuwei Basin.The Carboniferous coal measure strata are developed in this depression,and there is a certain potential for CBM exploration.However,for a long time,the structural evolution process and the maturity history of organic matter in this depression have not been studied.In this paper,the structural evolution and thermal history of this area have been studied by using the balanced profile technique and reservoir forming simulation technique.The results show that:(1)Erma Lake depression is a compound fault depression controlled by several NE trending normal faults;(2)The depression experienced four stages:Carboniferous-Permian rifting stage,Triassic-Early-Middle Jurassic uplifting and denudation stage,Late Jurassic-Early Cretaceous secondary rifting stage and Tertiary-Quaternary depression stage;(3)The thermal evolution of the Carboniferous source rocks in the Ermahu Sag is relatively high.The Carboniferous source rocks entered the stage of oil generation at the end of Permian,and entered the stage of gas generation at the end of Triassic,and are currently in the stage of high maturity-over-maturity.

关 键 词：儿马湖凹陷 平衡剖面 构造特征 构造演化 热演化史模拟 

分 类 号：P542.1[天文地球—构造地质学]