东营凹陷王58井区沙四段上亚段纯上5砂组物源方向分析

Source orientation analysis of Chunshang 5th sand group in upper Es_4 of Wang 58 wellblock in Dongying Sag

东营凹陷王58井区沙四段上亚段纯上5砂组发育了一套含油砂体。为了明确其成因、沉积特征及分布规律,通过分析岩石中碎屑组分类型、结构特征以及沉积地层中的砂砾岩分布、岩石特征元素分布特征等,认为王58井区沙四段上亚段纯上5砂组的砂体是南部和北部2大物源体系共同作用的产物。北部物源控制下的砂体以湖底扇沉积为特征,沉积物粒度粗;南部物源体系控制下的砂体以滑塌浊积扇为特征,沉积物粒度细。

The Chunshang 5th sand group in Es4 of Wang 58 wellblock which is located in the eastern area of Niuzhuang Subsag in Dongying Sag,has a set of oil-bearing sand.According to sand genesis,sedimentary features and distribution,the authors analyzed the rock detrital component types and structural features,sediment distribution and element patterns of sedimentary formations,etc.The sand body of the Chunshang 5th sand group in Es4 of Wang 58 wellblock is the product of interaction between the southern and northern source systems.The sand body under the control of the northern source is characterized by sublacustrine fan sedimentation and rough size of deposition;and the sand body under the control of the southern source is characterized by slumping turbidite fan and fine-sediment deposition.