基于频散测试分析的时频电磁资料校正处理及储层评价  

TIME-FREQUENCY ELECTROMAGNETIC DATA CORRECTION PROCESSING AND RESERVOIR EVALUATION BASED ON DISPERSION TEST ANALYSIS

作　　者：沈义斌 杨俊 曹阳 刘雪军 王财富 何展翔 SHEN Yi-bin;YANG Jun;CAO Yang;LIU Xue-jun;WANG Cai-fu;HE Zhan-xiang(Shenzhen Key Laboratory of Deep Sea Oil and Gas Exploration Technology(Southern University of Science and Technology),Shenzhen 518055,Guangdong Province,China;Guangdong Provincial Key Laboratory of Geophysical High Precision Imaging Technology(Southern University of Science and Technology),Shenzhen 518055,Guangdong Province,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China;Oriental Geophysics Co.Ltd.,Zhuozhou 072751,Hebei Province,China;Department of Earth and Space Science,Southern University of Science and Technology,Shenzhen 518055,Guangdong Province,China)

机构地区：[1]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 [2]广东省地球物理高精度成像技术重点实验室(南方科技大学),广东深圳518055 [3]南方海洋科学与工程广东省实验室,广东广州511458 [4]东方地球物理公司,河北涿州072751 [5]南方科技大学地球与空间科学系,广东深圳518055

出　　处：《地质与资源》2022年第3期404-411,共8页Geology and Resources

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);深圳市深远海油气勘探技术重点实验室项目(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(GML2019ZD0203).

摘　　要：时频电磁法(TFEM)作为一项比较成熟的油气检测技术,在国内外已得到了广泛的应用.在时频电磁解释过程中,主要采用电阻率和极化率联合定性检测,不能给出含油气的定量评价,并把地层电阻率视作与温度、压力无关的量.但随着地层深度增加,地层的温度、压力变化会对电阻率产生影响.由温度、压力的变化引起的电性变化会给储层解释带来误差.通过对岩石的频散测试,分析岩石电性参数随频率变化的规律,并结合岩石的频散性质研究了地层电阻率受温度、压力影响后的变化特征,而后通过拟合获得岩石电阻率与温度、压力的近似关系式.利用恰当的温压-电阻率函数,对时频电磁储层数据进行电阻率校正;利用校正后的电阻率数据,基于Archie公式计算研究区储层目标段的饱和度,并对储层进行了定量评价.Time-frequency electromagnetic method(TFEM),as a relatively mature oil and gas detection technology,has been widely used both in China and overseas.In the process of time-frequency electromagnetic interpretation,the combined qualitative detection of resistivity and polarizability is commonly used.However,such method cannot quantitatively evaluate the oil and gas content,and regards the formation resistivity as a quantity independent of temperature and pressure.In fact,with the increase of formation depth,the temperature and pressure changes of the formation will affect the resistivity,which would cause errors to reservoir interpretation.This paper analyzes the variation law of rock electrical parameters with frequency through the frequency dispersion test of rock.Combined with the dispersion properties of rock,the variation characteristics of formation resistivity affected by temperature and pressure are studied,and then the approximate relationship between rock resistivity and temperature/pressure is obtained by fitting.Using appropriate temperature-pressure-resistivity function,the time-frequency electromagnetic reservoir data are corrected for resistivity,by which the saturation of the target reservoir in the study area is calculated with the Archie formula,and the reservoir is quantitatively evaluated.

关 键 词：时频电磁 频散测试 电阻率校正 储层饱和度 油气评价 

分 类 号：P631.3[天文地球—地质矿产勘探] P618.13[天文地球—地质学]