摘要:
南黄海盆地北部坳陷北部断阶带主要定型于古近纪末期,在2条同向正断层持续强烈活动控制下,形成一个断背斜样式的坳中隆构造,并被坳陷期新近系和第四系地层覆盖,具有烃源岩后期埋藏较深、离深凹近和双向供烃的特点。同时,局部发育断背斜圈闭、鼻状构造圈闭、超覆和不整合等,这些圈闭与生储盖组合形成了很好的空间匹配关系,有利于油气聚集。通过对该北部断阶带中-新生代断裂活动特征、局部构造活动演化和石油地质意义的研究,探讨该区的勘探意义。
Abstract:
The northern fault zone of the Northern Sag was formed in the period of Late Paleogene in the South Yellow Sea Basin. It occurs between two normal strongly active faults as a depression-uplift structure on a faulted anticline covered by the Neogene and Quaternary deposited in the depression stage. The source rocks, which formed latter in time, are deeply buried and close to the depression center, and characterized by bidirectional oil supply. Faulted anticline traps, nose structure traps, and the overlap and unconformity sealed traps are locally developed, which matched well with source rocks, reservoirs and cap rocks, forming a good combination for hydrocarbon accumulation. In this paper, we based our conclusions on the research of the Mesozoic-Cenozoic movement of the northern part of the faulted terraces, together with local tectonic evolution and their petroleum potentials. Exploration targets are suggested based on the research.
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