古地理学报2025，Vol.27Issue(3)：684-695,12.DOI:10.7605/gdlxb.2025.023
川东地区寒武系洗象池群颗粒滩储集层发育特征及主控因素
Characteristics and main controlling factors of shoal reservoirs in the Cambrian Xixiangchi Group,eastern Sichuan Basin
摘要
Abstract
The well Pingqiao 1 in the eastern Sichuan Basin achieved commercial gas flow in the Cambrian Xixiangchi Group,demonstrating significant exploration potential in this stratigraphic unit.Based on outcrop,core,thin section,logging and well-log data,the development and distribution of shoal reservoir in Xixiangchi Group has been studied by reservoir geology method.The results show that:(1)The tidal flat cycle,peritidal cycle and subtidal cycle are identified.Shoal deposits predominantly develop in the peritidal and subtidal cycles.Peritidal shoals are located at the middle-upper part of high-stand system tracts where shallow-water conditions interacted with periodically exposed events,resulting in penecontemporaneous dissolution.Subtidal shoals formed in transgressive system tracts(TST)and lower HST high-energy zones,interfacing with low-energy deep subtidal environments without significant expo-sure-related dissolution.(2)The shoals in the eastern Sichuan Basin are developed in the eastern margin of the low-lying area of the platform,and are dominated by doloarenite and silt-fine crystal dolomite litho-facies.Reservoir spaces primarily consist of intergranular(dissolved)pores and intercrystalline(dis-solved)pores.The average porosity and permeability are 3.24％and 1×10-3 μm3,respectively,showing the characteristics of low porosity and permeability reservoirs.(3)The development of shoals in the periti-dal cycle is affected by the paleogeomorphology,and whether it is dissolved by atmospheric fresh water in the quasi-contemporaneous period is the key to reservoir formation.关键词
颗粒滩储集层/潮缘旋回/大气淡水溶蚀/洗象池群/川东地区Key words
shoal reservoir/peritidal cycle/meteoric freshwater dissolution/Xixiangchi Group/eastern Sichuan Basin分类
能源科技引用本文复制引用
王必金,刘晨虎,刘漪,刘皓天,陈绵琨,陈兰朴,于晓娜..川东地区寒武系洗象池群颗粒滩储集层发育特征及主控因素[J].古地理学报,2025,27(3):684-695,12.基金项目
中国石油化工股份有限公司科研项目"渝东—鄂西地区下组合常规天然气勘探潜力评价"(编号:P22077)资助.Financially sup-ported by the research project"Evaluation of conventional natural gas exploration potential of lower combination in the East Chongqing-West Hubei Re-gion")of China Petroleum and Chemical Corporation(No.P22077) （编号:P22077）
