天然气勘探与开发2025，Vol.48Issue(3)：54-63,10.DOI:10.12055/gaskk.issn.1673-3177.2025.03.006
川中地区沙溪庙组含浊沸石砂岩储层测井响应特征
Logging response characteristics in laumontite-containing sandstone reservoirs of Shaximiao Formation,central Sichuan Basin
摘要
Abstract
Logging interpretation indicates low consistency in laumontite-containing sandstone reservoirs of the Middle Jurassic Shaximiao Formation,central Sichuan Basin.Thus,combined with logging response characteristics,both qualitative logging identification and quantitative evaluation were performed on laumontite and its content by means of thin-section analysis,and scanning electron microscopy(SEM)and X-ray diffraction(XRD)experiments.Results show that(i)such reservoirs with laumontite in the first member of Shaximiao Formation(Shaximiao 1 Member)in Zitong block of central basin are characterized by low density and gamma ray,and high resistivity in their logging response,which are greatly different from those of laumontite-free reservoirs in Tianfu block of central basin;(ii)in the sandstone with laumontite,the density log-derived porosity ranges in 0.5%-1.2%higher than the acoustic log-derived porosity.On the basis of an apparent porosity model of density-acoustic slowness,the created method makes the quantitative content evaluation possible,with the consistency between model calculations and core analysis exceeding 85%;(iii)laumontite cementation increases the blocking rate in pore and throat by 23%-35%and reduces the preservation rate in primary pores by 18%-22%,respectively,resulting in sandstone reservoirs with remarkably poorer physical properties in Zitong block than those in Tianfu block;and(iv)such combinations as low gamma ray and density,and high resistivity in laumontite-containing sandstone can serve as an effective mark to distinguish Shaximiao reservoirs in the study area.It is concluded that laumontite diagenesis is the main control on strong heterogeneity in Shaximiao reservoirs.And the created logging evaluation model offers a new option for calculating parameters in similar reservoirs with complex lithology,being conducive to accuracy increase in reservoir interpretation.关键词
四川盆地中部地区/梓潼区块/侏罗系中统沙溪庙组/含浊沸石砂岩储层/测井识别/含量计算/天府区块Key words
Central Sichuan Basin/Zitong block/Middle Jurassic Shaximiao Formation/Laumontite-containing sandstone reservoir/Logging identification/Content calculation/Tianfu block引用本文复制引用
李旭,谭杰,王跃祥,李权,吴有彬,谢冰,易红梅,王琦,蒋国强,罗荣涛..川中地区沙溪庙组含浊沸石砂岩储层测井响应特征[J].天然气勘探与开发,2025,48(3):54-63,10.基金项目
中国石油天然气股份有限公司科技重大专项(编号:2023ZZ25YJ01). （编号:2023ZZ25YJ01）
