大牛地气田奥陶系岩溶缝洞型储层识别预测方法  

Identification and prediction methods for the karst fractured-vuggyreservoir in the Ordovician Formation of Daniudi gas field

作　　者：崔璐 CUI Lu(Huabei Oil&Gas Company,SINOPEC,Zhengzhou 450006,Henan,China)

机构地区：[1]中国石化华北油气分公司,河南郑州450006

出　　处：《石油地质与工程》2024年第4期33-38,共6页Petroleum Geology and Engineering

基　　金：中国石化科技部项目“鄂尔多斯盆地致密气稳产上产关键技术及示范”(编号:P23006)。

摘　　要：大牛地气田下古生界气藏主要发育中小尺度岩溶缝洞型储层,与塔里木盆地、四川盆地相比,缝洞定量识别评价难度大。通过岩心、薄片、常规-成像测井及物探等资料,明确了岩溶缝洞型储层类型和发育特征,形成一套储层定量识别和储层预测方法,主要取得了以下认识:①结合地质特点,将研究区储集岩的孔隙类型划分为孔隙型、裂缝-孔洞型和缝洞型三大类,建立了岩溶缝洞型储层综合识别模板;②通过基于贝叶斯准则的逐步判别法实现了不同类型储层定量划分,判别模型解释的储层类型与实钻资料对比基本一致;③利用基于极大似然属性的蚂蚁体和瞬时频率属性分别对岩溶缝洞型储层及含气性进行预测,形成一套井震联合的岩溶储层预测方法,为储层空间展布研究、井位部署优化及压裂改造提供重要依据。The Lower Paleozoic gas reservoir in Daniudi gas field is mainly formed by medium and small scale karst fractured-vuggy reservoirs,it is difficult to identify and evaluate fractured-vuggy quantitatively compared with Tarim and Sichuan Basins.Based on core,wafer,convention-imaging logging and geophysical data,the types and characteristics of karst fractured-vuggy reservoirs have been defined and we developed a set of quantitative identification and prediction methods.The main views are as follows:①Pore types of reservoir in the study area are divided into three categories:pore,fracture-vuggy and fractured-vuggy types according to geological characteristics,and the comprehensive identification template for karst fractured-vuggy reservoirs have been established;②Different reservoir types can be classified quantitatively according to the stepwise discriminant analysis based on Bayes criterion,and reservoir types explained by the discrimination model are basically consistent with the drilling data;③The prediction for reservoir and gas-containing property of karst reservoirs used by the ant-body based on the maximum likelihood attribute and instantaneous frequency attribute can form a set of karst reservoir prediction methods combining with wells and geophysics,which provides important basis for the study of reservoir spatial distribution,optimization about well location and fracturing reconstruction.

关 键 词：大牛地气田 岩溶缝洞型储层 综合识别模板 判别分析 储层预测方法 

分 类 号：TE112.23[石油与天然气工程—油气勘探]