CAJ | 학술논문

常规测井方法难以准确评价黏土、碎屑岩和碳酸盐等矿物，而ECS测井仪的晶体探测器可测量由中子源和地层矿物碰撞产生的伽马射线，因此依据地层矿物和伽马射线的对应关系，建立了ECS元素测井响应方程，利用优化反演方法确定矿物类型、计算矿物含量、骨架密度及脆性指数。利用该方法对页岩气A区块X井的ECS测井资料进行了解释，选择Si ，Al ，Fe ，Ca ，Su和K元素，反演出石英、长石、灰岩、白云岩、伊利石、绿泥石、蒙脱石、黄铁矿、云母和硬石膏等10种矿物中的6～8种及其含量，反演结果与岩心矿物分析结果具有较好的一致性，并根据矿物的含量计算出该井页岩地层的骨架密度为2.65～2.75 g／m3，脆性指数为40～60。这说明利用ECS测井资料可以评价页岩地层的矿物及含量，能据此计算页岩地层的骨架密度和脆性指数，可提供准确的评价结果，从而指导页岩地层的压裂设计与施工。
상규측정방법난이준학평개점토、쇄설암화탄산염등광물，이ECS측정의적정체탐측기가측량유중자원화지층광물팽당산생적가마사선，인차의거지층광물화가마사선적대응관계，건립료ECS원소측정향응방정，이용우화반연방법학정광물류형、계산광물함량、골가밀도급취성지수。이용해방법대혈암기A구괴X정적ECS측정자료진행료해석，선택Si ，Al ，Fe ，Ca ，Su화K원소，반연출석영、장석、회암、백운암、이리석、록니석、몽탈석、황철광、운모화경석고등10충광물중적6～8충급기함량，반연결과여암심광물분석결과구유교호적일치성，병근거광물적함량계산출해정혈암지층적골가밀도위2.65～2.75 g／m3，취성지수위40～60。저설명이용ECS측정자료가이평개혈암지층적광물급함량，능거차계산혈암지층적골가밀도화취성지수，가제공준학적평개결과，종이지도혈암지층적압렬설계여시공。
It is difficult to accurately evaluate clay minerals ,including those that contain clasolite and carbonates by using conventional logging methods .The crystal detector of the ECS logger measures gamma rays produced by collision of neutron sources and the strata minerals ,so the ECS element log response e-quation was established according to the corresponding relationship between minerals and gamma rays . The optimized inversion method was used to determine mineral types ,and calculate mineral content ,grain density and brittleness index .By using this method ,the ECS logging data of Well X in shale gas block A was interpreted ,the elements including Si ,Al ,Fe ,Ca ,Su and K were selected to determine six to eight kinds of minerals and their contents ,related to 10 minerals such as quartz ,feldspar ,limestone ,dolomite , illite ,chlorite ,montmorillonite ,pyrite ,mica and anhydrite .Eventually ,the inversion results coincided well with the core mineral analysis results ,the grain density of the shale formation in this well was calcu-lated according to the contents of the minerals ,which ranged from 2.65 2.75 g/m3 ,the brittle index is 40 60 .It showed that shale formation minerals and their contents can be evaluated by using ECS logging data ,and the grain density and brittleness index of shale formation can be calculated .These results could provide an accurate evaluation for shale formations and guide shale formation fracturing .