接触式激发极化法油气储层压裂监测有限元模拟  

Finite element simulation for fracturing monitoring of oil and gas reservoirs by using contact induced polarization method

作　　者：李静和[1,2] 何展翔 穆桐 LI Jinghe;HE Zhanxiang;MU Tong(College of Earth Sciences,Guilin University of Technology,Guilin,Guangxi 541004,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Shenzhen,Guangdong 511458,China;Shenzhen Key Laboratory of Deep Offshore Oil and Gas Exploration Technology,Southern University of Science and Technology,Shenzhen,Guangdong 518055,China;Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,Guangdong 518055,China)

机构地区：[1]桂林理工大学地球科学学院,广西桂林541004 [2]南方海洋科学与工程广东省实验室(广州),广东广州511458 [3]深圳市深远海油气勘探技术重点实验室(南方科技大学),广东深圳518055 [4]南方科技大学地球与空间科学系,广东深圳518055

出　　处：《石油地球物理勘探》2022年第3期719-727,I0009,共10页Oil Geophysical Prospecting

基　　金：国家自然科学基金项目“深地/深海探测中强电流激发下可控源电磁法激电效应机理研究及应用”(41874085);广西高等学校千名中青年骨干教师培育计划;广西隐伏金属矿产勘查重点实验室、深圳市深远海油气勘探技术重点实验室项目“深远海油气勘探技术”(ZDSYS20190902093007855);南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项“南海深部结构和地震灾害研究”(GML2019ZD0203)联合资助。

摘　　要：可通过天然或人工露头接入电流的勘探目标体是地球物理勘探领域重要的研究对象,其在矿产、油气、水文工程及环境地球物理领域较常见。如何高效、高精度地模拟接入电流目标体响应的空间分布,是一项极具挑战的任务。为此,基于油气储层压裂监测问题,提出接触式激发极化法三维有限元数值模拟技术。接触式激发极化法采用接触式供电、地面测量的观测系统,直接供电可有效提高观测信号的强度和精度。采用交错网格四面体剖分,计算离散网格单位场源电流分布,实现了接触式场源的三维有限单元法电磁场数值模拟。定义了比值法计算接触式激发极化法视电阻率计算公式。设计不同方法场源、物理模拟土槽试验及沁水盆地煤层气压裂监测模型,对数值模拟结果与传统激发极化法观测数据进行对比分析,验证了接触式激发极化法应用于油气层压裂监测领域的可行性及有效性。The exploration target which can access currents through natural or artificial outcrops is an important research object in geophysical exploration,and it is common in minerals,oil and gas,hydrological engineering,and environmental geophysics.However,it is a challenging task to efficiently and accurately simulate the spatial response distribution of targets with access to currents.Therefore,on the basis of the fracturing monitoring problem of oil and gas reservoirs,this paper proposes a three-dimensional finite element(FE)numerical simulation technology for the contact induced polarization method.The contact induced polarization method adopts the observation system with contact power supply and ground measurement,and the direct power supply can effectively improve the intensity and precision of observed signals.The current distribution of a unit field source of discrete grids is calculated by tetrahedron subdivision of staggered grids,and the three-dimensional numerical simulation of a contact field source is realized by the FE method.The formula for calculating the apparent resistivity of the contact induced polarization method is defined.In addition,we design the field sources,physical soil trough test simulation,and fracturing monitoring models of coalbed methane(CBM)reservoirs in Qinshui Basin of different methods,and the numerical results are compared and analyzed with the observation data of traditional induced polarization methods.The results verify the feasibility and effectiveness of the application of the contact induced polarization method in oil and gas reservoir fracturing monitoring.

关 键 词：接触式激发极化法 油气层压裂监测 单位场源 有限元模拟 沁水盆地煤层气 

分 类 号：P631[天文地球—地质矿产勘探]