【摘要】 陆内裂谷盆地是重要的含油气盆地类型之一。在讨论裂谷盆地成因、构造样式和沉积体系的基础上 ,重点讨论主动型和被动型裂谷含油气系统的成藏模式差异。主动型裂谷一般边界断层较缓 ,沉降速率大 ,火山活动频繁 ,地热梯度高 ,由于多次热扰动 ,同裂谷期发育的粗—细—粗的沉积旋回中形成多个次级旋回 ,构成良好的“自生自储自盖式成藏组合” ,发育滚动背斜、披覆背斜和潜山圈闭油气藏 ,油气储量主要分布在同裂谷期层序中。被动型裂谷通常边界断层较陡 ,伸展速率和沉降速率小 ,火山活动不发育 ,地热梯度低 ,同裂谷期沉积旋回中的次级旋回不明显 ,后裂谷期的辫状河砂体是主要的储集层 ,上覆的新生裂谷期滨、浅湖相泥岩是有效的区域盖层 ,形成良好的“下生上储上盖式成藏组合” ,反向断块是最主要的油气藏圈闭类型 ,油气储量主要分布在后裂谷期层序中。图 3参 2 5更多还原

【Abstract】 The extreme gravity trending east to west caused by tertiary basalt and diabase rocks in Xin′gang region, north of Huanghua Depression was ever interpreted as Paleozoic buried hills. Magma intrusion and volcanism during late Oligocene to early Miocene occurred in response to massive extension of east China, causing the formation of igneous diapirism structure traps, improving maturity of source rock. Katathermal fluid of mantle origin extracted and enriched dispersed organic material and speeded source rock transformation rate by catalytic action and hydrogenation. Magma upflowing channels, which were also the channels of oil and gas migration, caused reservoir distribution either in Es₃ as found in other Beitang areas and in Es₁, Ed and even in the Neogene system. The seismic data below igneous rocks are very poor and always image the pseudo-morphic deep structure, so the variable velocity mapping method should be used in the process of seismic interpretation.更多还原