海相古隆起在油气成藏中的作用

A Role of Marine Paleo-uplift in Reservoir-forming of Oil and Gas

海相古隆起是中国叠合盆地中下部组合中重要的油气富集领域,可分为4种类型:继承型、控沉积型(地层尖灭与台缘礁滩)、晚期定型(断裂隆升和挤压褶皱)、晚期改造型(断块和单斜)。根据海相古隆起结构特征和古隆起油气成藏特征的差异,划分出不同的古隆起成藏组合:纵向上,包括上组合、风化壳组合和内幕组合;平面上,可分为古隆起核部、上斜坡、下斜坡及深坳陷组合。研究结果表明,海相古隆起油气分布呈复式聚集特点,海相古隆起具有发现大油气田的地质条件。

Marine paleo-uplift is referred to as the important field of oil and gas enrichment for medium-lower combination in Chinese superimposed basin, which can be divided into four types: inheriting type, sediment-control type (stratigraphic pinch out and reef beach in the margin of platform), finalized shape in later stage (fault uplifting and extrusion folding), reconstructing type in later stage (fault- block and monoclinal type). Based on the difference between the texture feature and reservoir-forming feature of oil and gas of marine paleo-uplift, four types of reservoir-forming combinations in paleo-uplift are shown as following: in vertical, the reservoir-forming combinations consist of the top, crust of weathering and inner episode ones; in plane, the reservoir-forming combinations include the core ofpaleo-uplift, upper slope and down slope and deep depressing. The research results indicate that the oil and gas distribution of marine paleo- uplift is featured by complex accumulating, various paleo-uplifts have favorable geologic conditions to discover large oil and gas fields