测井技术2023，Vol.47Issue(6)：753-757,5.DOI:10.16489/j.issn.1004-1338.2023.06.014
基于体积模量的储层含气性定量评价方法
Quantitative Evaluation Method of Gas Bearing Based on Volume Modulus in Reservoir
摘要
Abstract
The gas reservoir of Benxi formation in Yishan slope of Ordos basin is characterized by various mineral types,low porosity,low permeability and strong heterogeneity.As a result,the resistivity curve is greatly affected by the changes of mineral content and physical properties,and the response to the change of reservoir gas content is weak.The traditional evaluation of fluid properties by resistivity logging data is poor.Based on the analysis of the law between gas saturation and compressional wave velocity,shear wave velocity and rock mechanics parameters,we use lithology scanning log,array sonic log and compensated conventional density log to calculate the formation volume modulus of 100%water content and the real volume modulus.Through the analysis of the difference between them,we form an evaluation method of gas-bearing reservoir based on the comparison of the formation volume modulus to evaluate reservoir fluid property.The water saturation model is constructed by the volume modulus of formation,skeleton,water and gas.Gas bearing evaluation chart and gas saturation chart are established according to the well logging data of gas layer,and the lower limit of gas saturation of gas layer,gas-water layer,water layer and dry layer of Benxi formation of Yishan slope is defined.The research goal of obtaining reservoir gas saturation based on non-electrical logging data is realized.Research results of this paper has been applied in the production of gas reservoir of Benxi formation of Yishan slope of Ordos basin,which improves the coincidence rate of well log interpretation.The application effect is good.Compared with the overlapping envelope method of P-wave and S-wave velocity,the overlapping envelope method of Poisson's ratio and P-wave and S-wave velocity ratio,and the overlapping envelope method of Elastic modulus and real formation volume modulus,the formation volume modulus correlation method can effectively eliminate the influence of rock framework on the evaluation of fluid properties,and solve the problem that the conventional electrical logging method is inaccurate in evaluating fluid properties.It provides technical support for selection of test layer in key wells and the study of gas bearing law of gas reservoir.关键词
测井评价/气藏/体积模量/流体识别/阵列声波/鄂尔多斯盆地Key words
log evaluation/gas reservoir/volume modulus/fluid identification/array sonic wave/Ordos basin引用本文复制引用
孙小平,刘春雷,李贵梅,李娜,李亚锋,黄平,李新进..基于体积模量的储层含气性定量评价方法[J].测井技术,2023,47(6):753-757,5.基金项目
中国石油天然气集团有限公司重大专项课题"致密砂岩气藏提高采收率关键技术研究"(2023ZZ25) （2023ZZ25）
