论文部分内容阅读
点坝是曲流河沉积最主要的砂体类型,是研究区最重要的储油砂体类型,也是河流相所有砂体微相中内部结构最为复杂的成因单元。本文针对X区所处的河控三角洲分流平原沉积模式,对曲流河点坝砂体的识别进行详细解剖,以X区P小层为例,通过对废弃河道所在的位置以及砂体厚度平面分布图的研究,结合单井垂向沉积层序,对研究区P小层进行了点坝砂体的识别,共识别出点坝砂体16个,其中有废弃河道沉积的点坝11个,没有废弃河道沉积的点坝砂体5个,点坝的宽度多为350~800米,长度多为400~700米。形成了一套适合研究区的点坝砂体识别技术,对高含水期曲流河储层的水驱油田的精细开发提供科学依据。
The point dam is the most important type of sandbody deposition in meandering river and is the most important type of oil sands in the study area. It is also the most complicated unit for the internal structure of all sand bodies in the river facies. In this paper, according to the depositional pattern of river delta distributary plain where X area is located, the identification of meandering bar dam of Meandering River is carried out in detail. Taking P sub-layer of X area as an example, the position of abandoned river channel and the plane of sand body thickness According to the study of the distribution map and the vertical sedimentary sequence of single well, the identification of point bar sandbodies is carried out on the P sub-layer of the study area. There are 16 point dam bodies identified, of which 11 are point dams with abandoned river channels, There are 5 point-bar sand bodies that have not been abandoned by river sedimentation. The width of point dam is mostly 350 to 800 meters and the length is more than 400 to 700 meters. A set of point-bar sand body identification technology is formed for the study area, which provides a scientific basis for the fine development of the water-drive oil field in Meandering River reservoir in high water cut period.