渤海湾盆地潜山多样性及其成藏要素比较分析

Diversity of buried-hills and comparison of their hydrocarbon-pooling factors in the Bohai Bay Basin

据地质、地球物理资料和油气成藏要素分析,认为渤海湾盆地潜山在岩性、结构和成因等方面具有多样性特征。岩性包括变质岩、沉积岩(碳酸盐岩、碎屑岩)和火山岩;结构可分单一结构和复式结构;而在成因上有逆冲、伸展和走滑作用。变质岩、火山岩潜山主要见于盆地东部的辽河、渤中和济阳坳陷;翘倾断块碳酸盐岩潜山见于冀中坳陷;而碳酸盐岩内幕潜山见于黄骅、济阳坳陷。储集空间是潜山油气成藏的主控因素。变质岩、火山岩潜山储集空间以裂缝为主;碳酸盐岩潜山除裂缝储层外,另一储集空间是溶蚀的孔、洞、缝。其中,变质岩潜山的裂缝发育受岩性、地貌和构造应力影响;碳酸盐岩潜山的孔、洞、缝发育则与岩性、层位等因素有关。

An analysis of geological and geophysical data and hydrocarbon-pooling factors shows that the buriedhills of the Bohai Bay Basin are characterized by diversities in lithology, structure and genesis. The lithology includes metamorphic, sedimentary（ carbonates and/or clastics）and volcanic rocks; the structure can be divided into single structure and composite structure; and the genesis includes thrusting, extension and strike-slip. The metamorphic and volcanic buried-hills occur mainly in the Liaohe, Bozhong and Jiyang depressions; the tilting fault-block carbonate buried-hills occur in the Jizhong depression; while the inner carbonate buried-hills occur in the Huanghua and Jiyang depressions. Reservoir space is the main controlling factor for hydrocarbon-pooling in buried-hills. The reservoir spaces in the metamorphic and volcanic buried hills are dominated by fractures;while that of carbonate buried hills have both fractures and disollution pore-vug-fractures. The development of fractures in the metamorphic buried hills is affected by lithology, geomorphology and structural stress; while the development of the pore-vug-fractures in carbonate buried hills are related to lithology, horizon and other factors.