基于相控地质统计学反演的开发可动用储量品质评价——以珠江口盆地B油田为例

Quality Evaluation of Development Available Reserves Based on Facies Controlled Geo-Statistical Inversion: A Case of B Oilfield in Pear River Mouth Basin

珠江口盆地B油田为碳酸盐岩复杂低渗生物礁、滩油田。为实现开发可动用储量品质评价及后期井位部署,针对碳酸盐岩储层纵横向非均质性强、储层连通性差异大等地质难题,运用相控约束地质统计学反演技术,进行了有效储层刻画;采用储层物性、储量规模、储量丰度等多因素分析方法,实现了开发可动用储量品质综合评价。结果表明滩礁灰岩有效储层纵向上呈“三段式条带式层状”“团块状”分布特征,平面上主要分布在高部位;储层品质可细分为五类,应优先动用纵向品质高的区域,探明可动用储量为1000余万立方米,动用储量占全探明储量的89.8%。研究对类似复杂碳酸盐岩油藏开发前期可动用储量分析具有借鉴意义。

B oilfield in Pearl River Mouth basin is a complex and low permeability reef and beach oilfield. Limited to the geological problems such as strong vertical and horizontal heterogeneity, large connectivity of carbonate reservoirs and so on, it has brought great challenges to the development of low permeability reservoir and the deployment of well position. Based on the study of facies controlled geo-statistical inversion technology, the effective reservoir characterization of complex carbonate reservoir in B oilfield has been realized. Combined with the factors such as reservoir physical property, reserve scale and reserve abundance, we completed quality evaluation of development available reserves and confirmed the most reliable development range finally. The results show that the effective reservoirs of beach reef limestone are characterized by “three-stage strip-like stratification” and “mass-like” distribution in the vertical direction, and mainly distributed in the high position in the plane. The reservoir quality can be divided into five categories, and priority should be given to the use of areas with high vertical quality. The proven available reserves are more than 10 million square meters, and the produced reserves account for 89.8% of the total proven reserves. The study can be used for reference in the development of similar complex carbonate reservoirs in the early stage of development.