利用电成像测井资料定量评价储层分选及渗透率研究  

Study on quantitative evaluation of reservoir sorting and permeability using Micro-electric imaging logging data

作　　者：关叶钦 徐锦绣 陆云龙 李志愿 GUAN Yeqin;XU Jinxiu;LU Yunlong;LI Zhiyuan(CNOOC China Limited,Tianjin Branch,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《物探化探计算技术》2024年第5期584-590,共7页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：中海石油(中国)有限公司重大科技专项(CNOOC-KJ 135 ZDXM 36 TJ01TJ-GD 2020-02)。

摘　　要：储层分选系数是评价碎屑岩沉积物分选的一个重要参数,而地层颗粒粒度大小及分布特征是计算分选系数的基础,沉积物的粒度通常是利用岩心样品在实验室中获取。当电成像测井资料分辨率足够高时,其电阻率值与粒径大小有一定的相对关系,那么电阻率频率分布曲线可以表示岩石粒度总体趋势分布,通过电阻率频率分布曲线,统计电阻率频率分布曲线上频率累积到25%、50%、75%处所对应的电阻率值的相对关系判断储层的分选性,建立公式计算储层“分选系数”;依据“分选系数”大小把储层划分为三种岩石物理相并建立渗透率评价模型。实际处理渤海油田LD井,计算得到的“分选系数”与岩心实验室测量分选系数在趋势上吻合较好,验证了该方法的可靠性与正确性,建立基于岩石物理相约束下的渗透率模型,提高了渗透率的计算精度,为地质油藏评价提供了更可靠的物性参数。The reservoir sorting coefficient is an essential parameter for evaluating clastic sediment sorting,and the grain size and distribution characteristics of formation particles are the basis for calculating the sorting coefficient.The grain size of sediments is usually obtained by using core samples in the laboratory.When the resolution of the electro-imaging logging data is high enough,the resistivity value has a specific relative relationship with the particle size.Then the resistivity frequency distribution curve can represent the overall trend distribution of rock particle size.Through the resistivity frequency distribution curve,The relative relation of the resistivity values corresponding to the frequencies accumulated to 25%,50%,and 75%on the resistivity frequency distribution curve was calculated to judge the sorting property of the reservoir,and a formula was established to calculate the"sorting coefficient"of the reservoir.According to the"separation coefficient",the reservoir is divided into three kinds of rock physical phases and the permeability evaluation model is established.In the actual treatment of the LD well in Bohai oilfield,the calculated"separation coefficient"is in good agreement with the separation coefficient measured in a core laboratory,which verifies the reliability and correctness of the method.The permeability model based on the constraint of the rock physical phase is established,improving the permeability calculation accuracy and providing more reliable physical parameters for geological reservoir evaluation.

关 键 词：电成像测井 频率分布 分选系数 岩石物理相 渗透率 

分 类 号：P631.81[天文地球—地质矿产勘探]