密井网条件下地质统计学岩性反演在河道砂体预测中的应用  

Stochastic Lithology Inversion in Condition of Close Well Spacing and Its Application in the Prediction of Channel Sandbody

作　　者：王雪萍[1] Wang Xueping

机构地区：[1]大庆油田有限责任公司勘探开发研究院

出　　处：《国外测井技术》2022年第1期31-34,2,共5页World Well Logging Technology

基　　金：国家科技重大专项“井震结合油藏精细结构表征技术”(2011ZX05010-001)。

摘　　要：大庆长垣密井网区,井多、层多、储层厚度薄、横向非均质性强,纵波阻抗对储层和非储层响应特征不明显,建立纵波阻抗与识别砂岩敏感的伽马曲线岩石物理图版,重构新的砂泥岩曲线。在此基础上,本文应用测井纵向分辨率高、地震横向密集的优势,采用井震结合地质统计学岩性反演,获得三维高分辨率砂岩概率体。利用高精度反演结果精细刻画薄层砂体的边界、走向及规模等,在此基础上指导砂体连通性分析和注采关系分析等具有较好的应用效果。这对于老油区开发后期储层精细油藏描述和剩余油的挖潜具有重要意义。Density well spacing area of Daqing Placanticline has many Wells,many layer thickness,thin reservoir and strong lateral heterogeneity.The response characteristic of the P-wave impedance to the reservoir and the non reservoir is not obvious.The rock physics plate of P-wave impedance and identifying sandstone sensitive gamma curve is builded and new sand mudstone curve is reconstructed.On this basis,this paper apply the advantages of high vertical resolution in well logging data and horizontal intensity in seismic data,and use combination of well logging data and seismic data of geostatistics to realize lithology inversion,we obtain three-dimensional high resolution probability of sandstone body.Using high precision of inversion results describe the boundary,direction,scale etc.of the thin layer of sand body.On this foundation,it has good application effect to guide the analysis of the connectivity of sand body and the analysis of the relationship between injection and production.This is of great significance for the description of fine reservoir and the exploitation of the remaining oil in the late stage of development of the old oil area.

关 键 词：地质统计学 岩性反演 井震结合 储层预测 大庆油田 

分 类 号：P61[天文地球—矿床学]