川东三叠系白云岩与蒸发岩差异组合测井相模式及勘探意义  

Logging facies mode and exploration significance of a differential combination of Triassic dolomite and evaporite in the eastern Sichuan Basin

作　　者：林晓杨 张兵[1] 肖红平[2] 曹高权 刘人和[2] 曹倩 王艳[1] 郑元超 施亦做 杨凯[1] 裴文彬 LIN Xiaoyang;ZHANG Bing;XIAO Hongping;CAO Gaoquan;LIU Renhe;CAO Qian;WANG Yan;ZHENG Yuanchao;SHI Yizuo;YANG Kai;PEI Wenbin(Earth Exploration and Information Technology Key Laboratory of Ministry of Education,Chengdu University of Technology,Chengdu 610059,China;Research Institute of Petroleum Exploration and Development,Beijing 100083,China)

机构地区：[1]成都理工大学地球勘探与信息技术教育部重点实验室,成都610059 [2]中国石油勘探开发研究院,北京100083

出　　处：《物探化探计算技术》2023年第4期443-452,共10页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目(2021DJ5302)。

摘　　要：川东三叠系蒸发岩与白云岩共生体系中,赋存了丰富的油气资源和大量富含稀有元素的深层卤水,开发潜力巨大。这里根据岩心、薄片、钻测井等资料,结合前人的研究,总结了白云岩与蒸发岩的岩性特征及差异组合序列,将其分为A、B、C、D四种常见组合序列类型:白云岩上覆蒸发岩、蒸发岩上覆白云岩、白云岩与蒸发岩互层、厚层白云岩,分别对应钟形、漏斗形、尖指形和箱形四种测井相模式,探讨了不同组合下的沉积环境,进一步厘定川东地区三叠系白云岩与蒸发岩差异组合的测井-沉积综合模式,并利用实例进行可靠性验证,同时通过分析研究区内井资料和镜下薄片资料,发现D型组合序列最有利于卤水发育,对川东地区下一步的“天然气、深层卤水”兼探具有重要意义。In the symbiotic Triassic evaporate and dolomite system in the eastern Sichuan basin,there are huge oil and gas resources and a large number of deep brine rich in rare elements.This paper summarizes the lithologic characteristics and differential combination sequences of dolomite and evaporate and divides them into four common combination types A,B,C,and D based on data from cores,thin sections,drilling,and logging,as well as previous studies:dolomite on evaporating,dolomite on evaporating,interbedded dolomite and evaporate,and thick dolomite.These four combination sequence types correspond to the logging facies modes of bell-type,funnel-type,finger-type,and box-type.We also discussed the sedimentary environment in different combinations and developed a logging-sedimentary comprehensive model of the differential combination of Triassic dolomite and evaporite in eastern Sichuan.Simultaneously,an example is used to confirm the reliability.The D-type combination sequence is most favorable to the formation of brine,according to good data and microscopic thin-section data in the research area.This is critical for the upcoming combined natural gas and deep brine detection in the eastern Sichuan basin.

关 键 词：川东地区 三叠系 白云岩 蒸发岩 测井相 

分 类 号：P624[天文地球—地质矿产勘探]