复杂砂岩矿物组分的定量评价方法——以陇东地区上古生界储层为例  

Quantitative evaluation method of mineral composition of complex sandstone:a case study of the upper Paleozoic reservoir in Longdong area

作　　者：李兴文 崔丽香 袁莎莎 佘刚 解辽博 张亚丽 LI Xingwen;CUI Lixiang;YUAN Shasha;SHE Gang;XIE Liaobo;ZHANG Yali(Changqing Branch of CNPC Logging Co.,Ltd.,Xi’an 710201,Shaanxi,China)

机构地区：[1]中国石油集团测井有限公司长庆分公司,陕西西安710201

出　　处：《石油地质与工程》2024年第4期52-57,共6页Petroleum Geology and Engineering

摘　　要：陇东地区上古生界储层岩屑成分种类复杂且多变,分选性很差,从成分到结构差异性都很大;储层孔隙结构变化大,孔渗关系复杂;复杂孔隙结构导致储层电性受孔隙结构影响大,对流体性质响应弱,流体性质判识难。元素测井是目前定量评价岩石矿物组分精度最高的测井方法,但受成本所限,不能普遍应用,因此利用常规测井曲线定量评价复杂砂岩矿物组分是一种有效的尝试。经实践证明,应用能谱岩石矿物组分定量评价技术,可精细评价岩性,识别低阻气层,其中,陇东地区上古生界解释符合率提高至80%,助力盒8段、山1段发现多个有利含气砂带,新增含气面积4444.1 m 2,预测地质储量2524×108 m 3,取得了良好效果。The composition of the upper Paleozoic reservoir cuttings in the Longdong area of Ordos Basin is complex and variable,with poor sorting and big differences in composition and structure.The pore structure of reservoirs varies greatly,and the relationship between porosity and permeability is complex,making it difficult to identify effective reservoirs.Due to the complex pore structure,the electrical properties are greatly affected,the response to the fluid properties is weak,and the fluid properties are difficult to identify.Currently,the logging method with the highest accuracy for quantitative evaluation of rock components is formation element logging.Electrical imaging logging can evaluate formation lithology,but there is a lack of quantitative evaluation methods for rock components.Quantitative evaluation of complex sandstone components using conventional logging curves is a good attempt.Practice has proven that the application of quantitative evaluation technology of energy spectrum rock composition,fine lithological evaluation,and identification of low resistivity gas reservoirs has achieved good results.The interpretation coincidence rate of the upper Paleozoic in Longdong has increased to 80%,and multiple favorable gas bearing sand belts have been discovered in the He8 and Shan1 sections.The newly increased gas bearing area is 4444.1 m 2,and the predicted geological reserves are 2524×108 m 3.

关 键 词：鄂尔多斯盆地 分选性 孔隙结构 地层元素 砂岩矿物组分 常规测井 

分 类 号：P585[天文地球—岩石学] TE112.23[天文地球—地质学]