利用多信息融合技术表征复杂断块油藏沉积相

Complex reservoir sedimentary-facies characterization with multi-discipline information integration

中国东部渤海湾盆地F油田虽实施了二次开发地震勘探,井网密度高,但受陆相断陷湖盆储层沉积复杂性影响,加之小断块发育,增加了精细储层描述的难度。为此,利用地震、测井、地质和开发等资料,采用多信息融合技术开展沉积相研究。首先,结合研究区地质背景,采用横向分块、纵向分段,选择典型段组合建立骨干井网,并通过分尺度、多手段逐级约束等时地层对比,建立精细等时地层对比格架;然后,运用多相(岩心相、测井相、地震相)联合标定技术,准确识别各类沉积微相,并利用古地貌、地层切片等技术揭示沉积演化特征;最后,以多地震属性融合约束的砂体厚度分布特征为指导,以井点测井相与井间的地震信息相互约束,以新开发井作为验证综合表征储层沉积微相,为剩余油挖潜提供重要地质依据,形成了一套断块油藏多信息融合的沉积相表征综合研究流程。

An old oilfield with a dense well-pattern in the Bohai Bay Basin in the Eastern China enters in the second development stage.However,this oilfield is characterized by complex sediments and well-developed subtle faults of continental fault-depression lacustrine basin,so their characterization is rather difficult.To overcome this problem,a multi-information integration,including seismic,logging,geological,and development data,is adopted to study sedimentary.Firstly,based on the geological background of the study area,an isochronous-strata-correlation framework is built with frame well patterns and isochronous-strata-correlations.Secondly,various sedimentary microfacies features are identified with the multi-facies(core,logs,and seismic)calibration.Meanwhile,the sedimentary evolution characteristics for the sedimentary model building are revealed with the paleogeomorphology analysis and stratigraphic slices.Finally,guided by the sedimentary model,the sand thickness and its distribution are characterized with seismic multi-attribute fusion constrained by well and crosswell information.Our comprehensive sedimentaryfacies characterization is verified by later drilling results,and provides a good foundation for the future hydrocarbon exploration and development.