港东开发区东一段湖相三角洲沉积规律研究与储集层精细刻画

大港油田港东开发区东一段属于湖相三角洲沉积环境,砂体发育受沉积相控制,空间分布复杂、横向对比预测难,常规资料与地震识别方法难以满足储集层刻画需求。依托新采集的“两宽一高”高精度地震资料,以层序地层学、地震沉积学研究思路为指导,以区域沉积演化规律作为宏观约束,通过建立层序地层格架,应用测井相、地震相识别技术,开展区域沉积相平面特征描述,结合储集层发育特征、含油气性显示结果,多元耦合明确三角洲沉积优势储集相带。应用地震分频和地层切片技术,开展小尺度砂体追踪及属性切片分析,提高三角洲前缘分流河道等薄储集层识别精度,盘活了区块东营组的储量潜力,同时形成一套针对三角洲沉积的优势储集层识别与薄砂体追踪技术系列。

Study on sedimentary law of lacustrine delta and fine characterization of reservoir in Dong 1 Member of Gangdong exploitation area

Dong 1 Member in Gangdong exploitation area of Dagang Oilfield belongs to lacustrine delta depositional environment.The development of sand body is controlled by sedimentary facies, the spatial distribution is complex, and the lateral correlation prediction is difficult. The conventional data and seismic identification methods are difficult to meet the requirements of reservoir characterization.Based on the newly acquired high-precision seismic data of broadband,wide-azimuth and high-density, guided by the research ideas of sequence stratigraphy and seismic sedimentology, and taking the regional sedimentary evolution law as a macro constraint,the plane characteristics of regional sedimentary facies are described by establishing sequence stratigraphic framework and applying log facies and seismic facies identification technology. Combined with the characteristics of reservoir development and the show results of oil-gas bearing ability, the dominant reservoir zones of deltaic deposit are identified by multiple coupling.Seismic frequency division and stratal slice technology are used to carry out small scale sand body tracing and attribute slice analysis, improve the identification accuracy of thin reservoirs such as distributary channel in delta front, revitalize the reserve potential of Dongying Formation in the block, and form a set of technology series of dominant reservoir identification and thin sand body tracing for delta sedimentation.