【摘要】 葡南油田主力油层葡萄花油层以发育大型浅水三角洲前缘沉积为特征,薄层水下分流河道砂岩体是其最重要的储层。油田开发已进入晚期阶段,但在后续加密钻探中不断钻遇新油砂体,现有开发密井网并不能很好控制油区内油砂体的分布。从构造发育史和地质演化角度分析,研究区水下分流河道砂岩体具有在断块低部位且南北向发育的规律;从地震资料角度分析,水下分流河道砂岩体与地震反射负相位具有很好的相关性。以葡南油田100km~2三维地震试验区为例,在充分研究构造演化特征、地层沉积特征的基础上,利用三维地震资料对水下分流河道砂岩体的分布规律进行了研究,并对薄砂层进行了有效预测,预测符合率达98%以上。更多还原

【Abstract】 As the main layer of Punan Oilfield,the Putaohua Formation developed a set of large shallow-water delta front deposit,and the thin underwater distributary channel sandbodies are the most important type of reservoirs.Now the oilfield is in the late development phase,but new oil-bearing sandbodies are often found in the follow-up infill drilling work,and the existing dense well pattern cannot cover the distribution of reservoir sand well.Based on the analysis of tectonic development and geologic evolution,the distribution character of underwater distributary channel sandbodies was researched which developed along the NS trend in low place of fault-blocks.The analysis of seismic data shows that the thin underwater distributary channel sandbodies have good correspondence with the negative event of seismic reflection.In a 3D seismic test area of 100km~2 in Punan Oilfield,the distribution of thin underwater distributary channel sandbodies were researched and successfully forecasted using the 3D seismic data on the basis of the research on structural evolution and stratigraphic sedimentation.And a high forecasting coincidence rate of more than 98%has been got.更多还原