天然气工业2017，Vol.37Issue(3)：17-24,8.DOI:10.3787/j.issn.1000-0976.2017.03.003
四川盆地川中地区震旦系灯影组热液白云岩储集相
Hydrothermal dolomite reservoir facies in the Sinian Dengying Fm,Central Sichuan Basin
摘要
Abstract
The Upper Sinian Dengying Fm is the focus of natural gas exploration in the central part of the Sichuan Basin (Central Sichuan Basin) in recent years.Especially,epigenic karstification and its resulted reservoir-seepage spaces have always been the focal points in researches.Based on the petrographic characteristics of drilling cuttings and core samples,and through experimental analysis by using trace elements,isotopes,and cathodoluminescence,the Dengying Fm dolomite was demonstrated to have matrix recrystallized dolomite (MRD),filled saddle dolomite (FSD) (the mean homogenization temperature of inclusion:178.5 ℃,high concentrations of Fe & Mn,slightly positive 87Sr/86Sr value) and hydrothermal minerals combination (including sphalerite,galena,pyrite,and quartz,etc.).Thus,it was proposed that hydrothermal dolomite reservoir facies (HDRF) exist in the Dengying Fm dolomite,in other words,the dolomite reservoir is composed of hydrothermal dissolved pores,intercrystalline pores of hydrothermal origin,hydrothermal caverns and expanded fractures,and was formed due to the reworking of hydrothermal fluid on tight matrix dolomite.Identification marks are presented in terms of petrography and geochemistry so that hydrothermal dolomite reservoir facies can be effectively recognized and identified.It is concluded that the development of hydrothermal dolomite reservoir facies in this area are preliminary controlled by deep and large basement faults and the strength of hydrothermal fluids.关键词
四川盆地/中部/热液白云岩储集相/震旦纪/灯影期/鉴别指标/控制因素/深大基底断裂/热液作用强度Key words
Central Sichuan Basin/Hydrothermal dolomite reservoir facies/Sinian/Dengying Fm/Identification marks/Controlling factors/Deep and large basement fault/Strength of hydrothermal fluids引用本文复制引用
蒋裕强,谷一凡,朱讯,徐伟,肖尧,李俊良..四川盆地川中地区震旦系灯影组热液白云岩储集相[J].天然气工业,2017,37(3):17-24,8.基金项目
国家科技重大专项“深层碳酸盐岩气藏高效开发技术”(编号:2016ZX05015-003). （编号:2016ZX05015-003）
