基于数值模拟的双感应测井裂缝参数定量评价方法  

Fracture evaluation method of dual induction log based on numerical simulation

作　　者：南泽宇[1] 李军[1] 刘志远[1] 张军[1] 

机构地区：[1]中国石化股份有限公司石油勘探开发研究院,北京100083

出　　处：《地球物理学进展》2017年第2期696-701,共6页Progress in Geophysics

基　　金：国家专项"中西部地区碎屑岩领域勘探关键技术"(2016ZX05002-005);中石化科技部青年创新基金"致密砂岩裂缝参数测井定量评价模型研究"(P14136);国家自然科学青年基金"页岩气储层孔隙孔径分布表征及渗透率评价方法研究"(41604124)联合资助

摘　　要：为厘清裂缝性地层双感应测井响应特征,建立裂缝参数评价方法,本文建立了含基岩、裂缝、井眼、双感应测井仪器的裂缝性地层双感应测井正演模型,以Gianzero几何因子理论为基础,结合阿特拉斯公司1503双感应测井仪器开展了高阻背景下低阻裂缝测井响应数值模拟.首先计算了1503双感应测井仪器几何因子,然后根据该几何因子求解不同裂缝开度、裂缝充填流体电导率、基岩电导率条件下双感应测井响应特征,分析了裂缝开度、裂缝充填流体电导率、基岩电导率对双感应测井响应的影响,归纳了裂缝性地层双感应测井响应规律.采用深感应视电阻率及深、中感应视电阻率比值作为横纵坐标,结合裂缝充填流体电阻率绘制了一套双感应裂缝开度评价图版.通过对图版数据进行拟合,建立了裂缝开度评价模型.在采用岩心、成像资料对评价模型刻度以减小几何因子理论计算非均质裂缝产生的误差后该模型可用于求取裂缝参数.最后将该方法应用于镇泾油田致密砂岩裂缝性储层进行裂缝参数定量评价,评价结果与成像测井评价结果吻合较好.The main purpose of this paper is to clarify the dual induction logging response of fractured reservoir and build the fracture parameter evaluation method. Forward model for fractured reservoir with conductive fracture, borehole,logging instrument and surrounding rock has been established, and according to Gianzero geometry theory, numerical simulation of low-resistivity fracture logging response on the background of high-resistivity has been carried out in combination with 1503 dual induction log instrument. Firstly,the instrument geometry factors of 1503 dual induction log are calculated to solve dual induction logging response under different conditions of fracture widths, conductivity and surrounding rock conductivity, response of which on dual induction logging response is analyzed then. The law of dual induction logging response in fractured reservoir is summarized and fractured parameter evaluation charts for dual induction are built according to vertical and horizontal coordinates derived from the ratio of ILD to ILM and ILD. Fracture parameters evaluation models are built according to these charts. Core data and imaging log data is used to calibrate these models to reduce the error of geometry theory. Finally, these fracture evaluation models are used to calculate fracture parameters of fractured tight sand reservoir in ZhenJing oil field, and the evaluation results show that it is in good agreement with the imaging logging evaluation results.

关 键 词：双感应测井 裂缝评价 图版法 数值模拟 

分 类 号：P631[天文地球—地质矿产勘探]