Forward modeling of tight sandstone permeability based on mud intrusion depth and its application in the south of the Ordos Basin  

作　　者：Liu Wen-hui Lv Xiao-Chun Shen Bo 

机构地区：[1]North China University of Water Resources and Electric Power,College of Geosciences and Engineering,Zhengzhou 450045,China [2]Yangtze University,Geophysics and Oil Resource Institute,Wuhan 430010,China

出　　处：《Applied Geophysics》2021年第3期277-287,431,共12页应用地球物理（英文版）

基　　金：supported by the National Natural Science Foundation of China project(No.41504103 and No.41804097).

摘　　要：Permeability is an important index in reservoir evaluation,oil and gas accumulation control,and production effi ciency.At present,permeability can be obtained through several methods.However,these methods are not suitable for tight sandstone in general because the pore type in tight sandstone is mainly secondary pores and has the characteristics of low porosity and permeability,high capillary pressure,and high irreducible water saturation.Mud invasion depth is closely related to permeability during drilling.In general,the greater the permeability,the shallower the mud invasion depth,and the smaller the permeability,the deeper the mud invasion depth.Therefore,this paper builds a model to predict the permeability of tight sandstone using mud invasion depth.The model is based on the improvement of the Darcy flow equation to obtain permeability using mud invasion depth inversion of array induction logging.The influence of various permeability factors on the model is analyzed by numerical simulation.The model is used to predict the permeability of tight sandstone in the south of the Ordos Basin.The predicted permeability is highly consistent with the core analysis permeability,which verifi es the reliability of the method.

关 键 词：permeability evaluation Darcy flow equation numerical simulation mud invasion depth array induction logging 

分 类 号：TE311[石油与天然气工程—油气田开发工程]