论陆相含油气沉积盆地地下水动力场与油气运移、聚集

ORIGIN AND EVOLUTION OF HYDRODYNAMICS AND THE MIGRATION,ACCUMULATION OF PETROLEUM IN CONTINENTAL PETROLIFEROUS SEDIMENTARY BASINS

含油气沉积盆地地下水动力场的形成、演化是沉积盆地演化在孔隙流体中的综合反映,它直接受盆地地貌、水文网、沉积环境、构造性质及其演化史的控制。地下水动力场的形成、演化与油气的运移、聚集和分布规律具有十分密切的关系。含油气沉积盆地通常经历了多期水文地质旋回,从而决定了在一个独立的水动力体系中油气阶段性运移和阶梯式—环带状分布的特点。油气的阶梯式—环带状分布以沉积凹陷控制的包括部分相邻三级构造单元的具有相对独立的水动力体系为基本单元。因此,作为一个具有多个沉积凹陷的盆地来说,油气的分布通常由多个环带复合而成。

The origin and evolution of hydrodynamics in petroliferous sedimentary basins was a synthetical reflection on pore fluids of the climate, drainage distribution, tectonics, sedimentary environments and their evolution. There were closely relationships among the origin and evolution of hydrodynamics, and the migration and accumulation of petroleum. Generally speaking,a petroliferous sedimentary basin experienced multi-stage hydrogeological cycles, which decided that, in an independent hydrodynamic system, the oil-gas migrated by stages,with a stair-shaped or ringlike distribution. Centrifugal flow caused by mudstone-compacted water was a main dy- namic force that induced the petroleum migration eohydrogeologic cycles and centrifugal flow stages and accumulation in sedimentary basins. Palinduced the wave type migration and step-annular distribution of oil and gas in an independent hydrodynamic system. Several hydrodynamic systems would be developed in such basins with several depressions, which would induced several annular distribution of oil and gas in such basins. As a sedimentary basin with poly-sag, the oil-gas consisted of, generally,composite poly-ringlike distribution.