The Polystage Evolution of the Subsidence Downwarping Region and Formation of Petroleum Accumulation
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摘要: 含油气盆地沉降坳陷主体以其多阶段旋回性发展制约着含油气盆地沉积、沉降和生油气凹陷中心形成和发展，制约着坳陷的沉积岩系序列和烃源岩发育。生油气坳陷的连续沉降过程或不同原型盆地的垂向叠加而构成的间断多阶段沉降过程，在烃源岩不断埋深的状态下，控制着烃源岩生烃热演化的多阶段连续生烃过程。多期构造运动，又为不同时代生烃、不同类型油气提供了运聚成藏条件，为油气多源复合成藏提供了前提。Abstract: The subsidence downwarping region in petroleum bearing basins was found to be characteristic of polystage and polycycle development. The characteristics of tectonic movement controlled the formation and devolopment of sediment subsidence and petroleum bearing depression center, and also influenced the sedimentary rock sequence and formation of hydrocarbon source rocks. The process of successive subsidence or interruptly polystage subsidence existed during the formation of petroleum bearing downwarping region as a result of the vertical superposition of prototype basins in the geologic time. This process controlted the polystage successivety hydrocarbon-generating process in the thermal evolution of sonroe rocks, in the condition of continuously being buried.Multiphase tectonic movements formed faults shatter belts regional, unconformity and fissure system of structural culmination, which together with good primary porosity-Permeability and secondary porosity-permeability system in the process of diagenesis supplied different phases and types of oil and gas under the condition of migration and entrapment.
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