【摘要】 鄂尔多斯盆地中部的白豹-华池地区延长组长6油层组的长6-3亚段以发育厚层块状砂岩为特征,对其成因的认识分歧很大。作者在众多前人研究成果的基础上,充分利用区内钻井岩心、测井及地震资料对长6-3厚层砂岩特征进行研究,认为它是由正常沉积与事件沉积所形成的砂体相互叠加而构成的。其中正常沉积为三角洲前缘砂体,事件沉积为地震作用所形成的砂体以及由地震作用导致三角洲前缘滑塌再搬运而形成的浊积砂体。2种作用、3种成因类型砂体在垂向上相互叠置、在平面上相互交叉,构成了该地区广泛分布的厚层砂岩。更多还原

【Abstract】 The Chang 6 oil layer is located in the Baibao-Huachi region of the Ordos Basin centre.It is one of the most developed regions and reservoirs,but also one of the most important producing formations in the basin.The Chang 6-3 sub-paragraph of the Chang 6 oil layer is characterized by the thick massive sandstone.For the origin of the thick massive sandstone of the Chang 6-3 sub-paragraph,different scholars have different opinions.Based on the previous studies,by full use of cores,well-logging data and seismic interpretation information,and through analysing the thick sandstone characteristics of the Chang 6-3 sub-paragraph,the paper regards the thick massive sandstone of the Chang 6-3 sub-paragraph is overlapped by the sandbody of normal sedimentation and the sandbody of events deposits.The sandbody of normal sedimentation is the delta front sandbody.The sandbody of events deposits formed by two major categories of functions includes the earthquake shock sandbody and the turbidite deposition sandbody.Two functions,three types of sandbodies overlapped vertically and in the plane intersected to form a wide distribution of thick layer sandstones in the region.更多还原