渤海D油田沉积模式研究及挖潜实践

Study on sedimentary model and potential tapping practice of Bohai D oilfield

针对海上中深层油田开发初期井筒资料少、地震资料品质差、储层精确预测难度大的问题,以渤海湾盆地D油田沙河街组沙一段为例,充分利用层序地层学和地震沉积学方法,通过精细地层对比、古地貌分析以及地震分频处理技术开展沉积模式研究及储层定量刻画。研究结果表明D油田发育辫状河三角洲-碳酸盐混合沉积模式,碎屑岩储层主要发育于西侧构造高部位,东侧古隆起斜坡区域主要发育碳酸岩沉积。基于地震分频技术通过优选频率及属性明确砂体展布规律,定量刻画了沙一段储层厚度。研究结果成功指导了开发评价井的部署,并为开发方案的实施提供了可靠地质依据。

For the problems of the lack of wellbore data,poor seismic data quality,and difficulty in accurate reservoir prediction during the early stage of oilfield development in middle-deep strata offshore,taking the first Member of Shahejie Formation in D oilfield of Bohai Bay Basin as an example,this paper makes full use of sequence stratigraphy and seismic sedimentology to study sedimentary model and reservoir quantitative characterization through fine stratigraphic correlation,paleogeomorphology analysis and seismic frequency division processing technology.The findings show that the mixed sedimentary model of braided delta-carbonatite is developed in D oilfield,the clastic reservoir is mainly developed in the high spot of the structure in the west,and the carbonatite deposition is mainly developed in the slope area of paleo-uplift in the east.Based on the seismic frequency division technology,the distribution rule of sand body was determined by optimizing the frequency and attributes,and the reservoir thickness of the first Member of Shahejie Formation is quantitatively characterized.The results successfully guide the deployment of development evaluation wells and provide reliable geological basis for the implementation of development programs.