春光油田沙湾组多期次辫状河沉积单砂体识别与刻画

Identification and characterization of multi-stage braided river sedimentary single sand bodies of Shawan formation in Chunguang exploration area

为了解决春光油田东北部由于发育多期次辫状河沉积,致使垂向上砂体叠置关系复杂,存在平面上单砂体识别及刻画难度大,油水关系矛盾等问题,利用地震、钻测录、岩心等静态资料及实钻井动态生产数据,采用"高度上利用层位差、垂向上结合厚度差、空间上遵循微相分布规律"的研究方法,对单河道砂体进行识别及精细刻画,并结合河道下切叠置特征,将砂体叠置关系划分为分离式和叠加式两种类型。区内由于辫状河泛滥平原泥岩的遮挡,致使砂体不连通,存在不同的油水界面,可较好地解释油水关系矛盾问题、理清单砂体展布特征,为研究区剩余油进一步挖潜调整提供地质依据。

In order to solve the problems of complicated vertical sand body superimposition,difficulty in identifying and depicting single sand body in plane and contradiction in oil-water relationship in Northeast Chunguang exploration area due to the development of multi-stage braided river deposits,based on the static data such as seismic data,drilling logging,core and real drilling dynamic production data,the sand body stacking relationship is divided into two types:separate type and superimposed type.By adopting the research method of"using layer difference in height,combining thickness difference in vertical direction and following micro-facies distribution regularity in space",the single channel sand bodies are identified and finely depicted.Due to the shielding of mudstone in braided river flood plain,sand bodies are not connected,and there are different oil-water interfaces,which better explains the contradiction of oil-water relationship,clarifies the distribution characteristics of single sand body,and provides geological basis for further tapping the potential adjustment of remaining oil in the study area.