基于地质统计学反演技术的W油田浊积砂体描述  

Description of turbidite sand body in W oilfield based ongeostatistics inversion technology

作　　者：杨国杰[1] YANG Guojie(Exploration and Production Research Institute of Shengli Oilfield,SINOPEC,Dongying Shandong 257000,China)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257000

出　　处：《石油化工应用》2021年第5期88-92,共5页Petrochemical Industry Application

摘　　要：W油田沙三下段广泛发育浊积砂体,分布不稳定、横向变化快;地震反射同相轴横向连续,变化幅度小,难以刻画砂体边界,难以浊积砂体预测。研究通过建立敏感岩性曲线,采用降低测井曲线的频率、降低反演约束模型采样率、改变地震约束权重的方法,克服了以往地质统计学反演由于过高分辨率导致反演结果模型化严重、多解性强的问题,有效描述了砂体的纵向叠置关系及横向展布特征,反演结果符合研究区浊积砂体沉积规律,并得到了钻井验证,解决了高部位是水层而低部位是高产油层的油水矛盾问题,为该区下一步的滚动勘探开发提供了地球物理依据。该技术操作简单,适用性强,可以为其他地区浊积砂体的储层预测及描述提供借鉴。Turbidite sand bodies are widely developed in Es3x,in W oilfield.The distribution of this type of sand bodies is unstable and the lateral variation is fast.The characteristics of seismic reflection are continuous and stable in the lateral direction,so it is difficult to depict the boundary of the sand bodies,prediction of turbidite sand body is diffcult.The study overcomes the defects of previous geostatistical inversion that the inversion result is modelized seriously and has strong multiple solutions due to high resolution by establishing sensitive lithologic curve,reducing the frequency of logging curve,reducing the sampling rate of in version constraint model, and improving the seismic constraint. The results show that this method can effectively describes the vertical superposition relationship and the horizontal distribution characteristics of sand body which are consistent with the sedimentary characteristics and actual drilling. This method also solves the problem of oil-water contradiction.It provides geophysical basis for the next step of rolling exploration and development in this area. This technology can be used for reference in reservoir prediction and description of turbidite sand bodies in other areas.

关 键 词：浊积砂体 敏感曲线 地质统计学反演 储层预测 

分 类 号：TE155[石油与天然气工程—油气勘探]