【摘要】 在综合前人研究成果的基础上,结合我国南海北部边缘盆地的一些具体勘探实例,从宏观到微观,在不同尺度上论述了细粒浊积体储层的地震反射特征、测井曲线特征及其内部结构特征。在地震剖面上,细粒浊积体主要表现为上扇的下切谷充填、斜坡扇以及盆底扇。它们的地震反射特征总体为中—弱振幅双向下超在层序界面上,而且由于浊流砂体的沉积速度快,常形成薄的砂泥互层,所以其自然电位曲线总体反映为中—低幅度的齿形叠加,其理想的自然伽马测井曲线的形状也表现为不同类型的齿状箱形或齿形叠加。其内部结构特征,除具有细粒薄层的特点外,常还有异常超压的形成。超压不但能使细粒浊积体保留大量原生孔隙,而且还能通过影响成岩作用来溶蚀长石而使细粒浊积体形成部分次生孔隙,因此其储层物性较好。更多还原

【Abstract】 On the basis of reviewing predecessors’ research results,combined with some cases of South China Sea,this paper summarizes the internal characteristics of finegrained turbidites in various scales by means of seismic and logs data.Finegrained turbidites include incised valley,slope fan and basinfloor fan,downlapping bidirectionally on sequence surfaces with middle or low amplitude in the seismic profiles.The turbidite sequence is characterized by interbeds of relative thin sandy shales and mudstones because of the rapid sedimentation,showing a pattern of sawtooth with middle to low relief in the SP logs and gammaray curves.Therefore,overpressure usually develops in turbidite system,which not only prevents compaction of lithology,but also is helpful for the formation of secondary pores due to the solution of feldspar through diagenesis.Hence,reservoirs with better quality have been developed in the turbidite systems.更多还原