论文部分内容阅读
通过对近年来在北黄海盆地的油气勘探认识的总结,结合区域地质研究成果,从盆地的基底结构、地质结构和主要构造类型等方面对北黄海盆地的地质构造特征进行了分析。提出北黄海盆地是在前中生代结晶基底之上发展起来的,盆地经历了走滑拉分(J3-K1)、断陷(E2-E3)、拗陷(N—Q)3次主要的沉降作用过程,形成了下、中、上3个构造层,在盆地内发育了断裂、褶皱和潜山3种基本构造类型。盆地的这种构造特征为盆地内油气的生成运聚提供了物质基础和边界条件,特别是晚侏罗世—早白垩世由于走滑拉分形成的下构造层具有较好的生烃物质基础,同时还有良好的圈闭发育条件,后期的构造改造也有利于油气的生成聚集,应是北黄海盆地的主要勘探对象。
Based on the summary of oil and gas exploration in the North Yellow Sea Basin in recent years and the research results of regional geology, the geological structure characteristics of North Yellow Sea Basin are analyzed from the basement structure, geological structure and main tectonic types of the basin. It is proposed that the North Yellow Sea Basin developed on the basis of the pre-Mesozoic crystalline basement. The basin underwent three major subsidences of J3-K1, E2-E3 and N-Q. Process, the formation of the next, middle and upper three tectonic layer, developed in the basin of the fault, fold and buried hill three kinds of basic tectonic types. The tectonic features of the basin provide material basis and boundary conditions for the formation and migration of oil and gas in the basin. In particular, the lower tectonic layer of the Late Jurassic-Early Cretaceous due to the strike-slip division has a good hydrocarbon-generating material basis At the same time, there are also favorable conditions for the development of traps. The structural reconstruction at the later stage is also conducive to the formation and accumulation of oil and gas and should be the major exploration target in the North Yellow Sea Basin.