渤海湾盆地沧东凹陷南皮斜坡地质特征与油气成藏

发布时间：2018-02-11 00:21

本文关键词： 南皮斜坡构造油藏自源成藏连续性成藏　出处：《天然气地球科学》2017年09期 　论文类型：期刊论文

【摘要】：随着沧东凹陷正向构造带油气藏勘探程度的不断提高,成藏区带规模发现遇到瓶颈,勘探思路必须由构造油气藏勘探向斜坡连续性油气藏勘探转变。通过对沧东凹陷南皮斜坡精细构造解释、沉积微相划分、烃源岩特征及区域控砂控藏机制的分析,获得南皮斜坡地质特征与油气成藏模式的认识。研究表明,南皮斜坡为宽缓继承性斜坡,构造呈现高、中、低斜坡三分性特点,古近系孔店组二段(孔二段Ek_2)发育辫状河三角洲沉积,孔店组一段(孔一段Ek_1)底部发育浅水三角洲、上部发育冲积扇沉积,有利砂体大面积发育,孔二段发育好—很好烃源岩,生烃强度大。以构造、砂体、烃源岩及已知油藏匹配,形成自源成藏、它源成藏两大成藏组合系统,并构建孔二段有效生油岩范围内,中斜坡孔二段主砂体区常规油藏聚集,低斜坡远端细粒沉积岩类与油页岩叠合形成致密油,含油气系统范围内常规油与致密油叠加连片,形成"连续性成藏"油气成藏模式;孔一段受孔二段有效烃源岩控制下,形成"底部砂组近源大面积充注、上部继承性断裂网状沟通"的复合聚油模式。
[Abstract]:With the increasing exploration of oil and gas reservoirs in the forward structural zone of Cangdong Sag, the scale of the zone-forming zone has been found to be a bottleneck. The exploration idea must be changed from structural oil and gas reservoir exploration to continuous oil and gas reservoir exploration on slope. The fine structure interpretation, sedimentary microfacies division, source rock characteristics and regional sand control and reservoir control mechanism of Nanpi slope in Cangdong depression are analyzed. The geological characteristics and hydrocarbon accumulation model of Nanpi slope are obtained. The study shows that Nanpi slope is a wide and slow inherited slope with high, middle and low slope features. The braided river delta deposits are developed in the second member (Ek2) of the Gongdian formation of the Paleogene, the shallow water delta is developed at the bottom of the first member of the Kongdian formation (Ek-1) and the alluvial fan deposit is developed in the upper part of the formation. With the matching of structure, sand body, hydrocarbon source rock and known reservoir, the formation of self-source and reservoir forming assemblage system is formed, and the conventional reservoir accumulation in the main sand body area of the second stage of the middle slope is constructed within the effective oil source rock range of the second stage of the pore. The fine sedimentary rocks of the distal end of the low slope are superimposed with oil shale to form dense oil, and the conventional oil and dense oil are superimposed in the oil-gas system to form a "continuous reservoir forming" hydrocarbon accumulation model, and the pore 1 member is controlled by the effective source rock of the second stage of the pore. A compound oil accumulation model is formed, which is composed of "near source large area filling of bottom sand formation and network communication of inherited faults in the upper part".
【作者单位】：中国石油大港油田分公司;大港油田勘探开发研究院;
【基金】：中国石油天然气集团重大科技专项“大港油区大油气田勘探开发关键技术研究”(编号:2014E-06-03)资助
【分类号】：P618.13

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