渤海湾盆地冀中坳陷古潜山的构造成因类型

发布时间：2018-08-08 13:30

【摘要】：冀中坳陷的潜山是油气勘探的重要领域。解剖潜山的地质结构、揭示潜山的成因机制是深化油气勘探领域的认识、深入分析潜山构造演化的关键。本文在覆盖全坳陷高精度的二维、三维地震资料,数百口深探井系统解释的基础上,应用构造解析方法,深入研究了潜山的地层系统、断裂构造与构造演化特征,提出了潜山成因分类的新方案。研究表明,冀中坳陷的潜山经历了前中生代建造形成、侏罗纪晚期挤压、白垩纪-古近纪多幕伸展断陷与新近纪-第四纪沉陷埋藏的形成过程;依据潜山发育的构造位置、构造变形特点与伸展变形的强度,将潜山划分为14种基本的成因类型;受控于长期演化及内外地质营力的联合作用,潜山多具有复合成因,在平面上不同成因类型的潜山带有规律地出现,主要有掀斜断块-高凸起型、反向断阶型、同向断阶-高凸起型、横向背斜或转换凸起-反转斜坡型、高凸起型-伸展外来断块型-反转斜坡型、高凸起型-双向旋转型-高凸起型、掀斜断块-变质核杂岩型等7种组合类型。其中,反向掀斜断块型、高凸起型、断阶型、反转型斜坡、外来断块型等成因类型的潜山因源-储组合、成山与成藏时期匹配而含油气性较好。冀中坳陷的潜山油气资源丰富,上述潜山成因分类方案有助于进一步剖析潜山的油气成藏机理与油气分布规律。
[Abstract]:Buried hill in Jizhong depression is an important field of oil and gas exploration. Dissecting the geological structure of buried hill and revealing the genetic mechanism of buried hill are the key to deepen the understanding of oil and gas exploration field and analyze the evolution of buried hill structure. Based on the high precision 2D and 3D seismic data and the interpretation of hundreds of deep exploration wells in the whole depression, this paper has studied the stratigraphic system, fault structure and structural evolution characteristics of buried hill by means of structural analysis. A new scheme for genetic classification of buried hill is proposed. The study shows that the buried hill in Jizhong depression has experienced the formation of pre-Mesozoic formation, late Jurassic compression, Cretaceous Paleogene multi-episode extensional fault depression and Neogene Quaternary subsidence. The characteristics of tectonic deformation and the strength of extensional deformation can be divided into 14 basic genetic types, controlled by the long-term evolution and the combined action of internal and external geological forces, the buried hills are mostly of compound genesis. The buried hills of different genetic types appear regularly on the plane. They are mainly tilted fault-high protruding type, reverse fracture stage type, codirectional fault-high protruding type, transverse anticline or transverse-bulge slope type. There are seven types of assemblages: high uplift type-extensional extraneous fault block type-reverse slope type, high uplift type-bidirectional rotation type-high uplift type, tilting fault block type and metamorphic core complex type. Among them, the buried hill of the reverse tilting fault block type, the high protruding type, the fault terrace type, the anti-transformation slope type, the foreign fault block type and other genetic types of buried hill has better petroliferous property because of the source-reservoir assemblage, the matching between the mountain forming and the reservoir forming period. The buried hill in Jizhong depression is rich in oil and gas resources. The genetic classification scheme of buried hill is helpful to further analyze the mechanism of hydrocarbon accumulation and the distribution of oil and gas in buried hill.
【作者单位】：中国地质大学能源学院;中国石油华北油田分公司地球物理勘探研究院;
【基金】：国家自然科学基金项目(41430316) 中国石油天然气股份有限公司重大科技专项(2017E-15)联合资助
【分类号】：P618.13

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