哈山地区构造演化与油气充注耦合关系研究

Coupling Relationship between Tectonic Evolution and Hydrocarbon Charging in Hashan Area

哈山地区构造演化史、油气充注过程及构造演化与油气充注耦合关系认识不清是制约该区油气勘探推进的关键难题。研究在构造地质学理论指导下结合元素分析等方法揭示了哈山地区的构造演化历程,认为该区经历了早二叠世后碰撞拉张伸展期、晚二叠世强烈逆冲推覆期、三叠纪冲断叠加期、侏罗纪-白垩纪振荡隆升期和新生代左旋走滑调整期5个构造演化阶段。利用油包裹体荧光特性、烃类包裹体伴生的盐水包裹体均一温度分析;并结合埋藏史,确定了该区的3期油气充注,并确定其时间分别为距今250 Ma、200 Ma和130 Ma。在此基础上,分析了构造运动与油气充注的耦合关系,明确了多期逆冲推覆构造运动控制了油气的充注成藏过程,指出研究区存在3个构造运动与油气充注的耦合期,为探索研究区油气成藏演化规律和深化油气勘探提供了地质支持。

The tectonic evolution, hydrocarbon charging history and the coupling relationship between them is unclear in Hashan area, which restrict the oil and gas exploration work. In the guidance of structural geology theory and elemental composition analysis, the research area＇ s tectonic evolution history is revealed, the 5 evolution stage include： Early Permian post-collisional tension-extending stage, Late Permian thrust-nappe stage, Triassic thrust- stack stage, Jurassic-Cretaceous oscillation-uplift stage and Cenozoic left lateral strike-slip adjust stage. Using the fluorescent colors of oil inclusion and coexisting salt-water inclusion homogenization, temperature and combined with the thermal and burial histories, three different hydrocarbon charging timing have been identified： 250 Ma, 200 Ma and 130 Ma. On this basis, it studied the coupling relationship between tectonic and hydrocarbon charging, the multi-stage thrust-nappe tectonic movement control the hydrocarbon charging and accumulation process, there are 3 coupling stage of tectonic movement and hydrocarbon charging. It provide geology support to the research hydrocarbon accumulation-evolution law and carry on the oil and gas exploration work.