石油勘探与开发2017，Vol.44Issue(4)：549-560,12.DOI:10.11698/PED.2017.04.08
天然气运移有机-无机地球化学示踪指标——以四川盆地川西坳陷侏罗系气藏为例
Tracing natural gas migration by integrating organic and inorganic geochemical data:A case study of the Jurassic gas fields in western Sichuan Basin, SW China
摘要
Abstract
Based on the integrated geochemical and isotopic analysis of natural gases,formation waters,authigenic minerals,and fluid inclusions,a set of organic and inorganic geochemical tracing parameters,including methane/ethane ratio (C1/C2),N2 content,arene/alkane ratio,carbon isotope of methane (δ13C1),total dissolved solids (TDS) and chemistry of formation water,oxygen and carbon isotopic composition of authigenic calcite cement (δ1SOcalcite and δ13Ccalcite),and homogenization temperature and salinity of hydrocarbon-bearing brine inclusions,have been proposed to indicate the phase,direction,and pathway of natural gas migration and to discuss the migration processes and mechanisms of the Jurassic hydrocarbon in western Sichuan.This study results reveal that the Middle Jurassic gas in western Sichuan depression mainly migrated in water-dissolving phase and had the characteristics of increase of arene/alkane ratio and δ13C1,decrease of TDS,light δ1SOcalcite and δ13Ccalcite in gas-bearing sands,and high homogenization temperature and low salinity of hydrocarbon-bearing brine inclusions,while the Upper Jurassic gas primarily migrated in free gas phase.Additionally,it is demonstrated that the migration directions and pathways of the Jurassic gases in western Sichuan can be investigated effectively by applying multiple organic and inorganic geochemical tracing parameters,in combination with the study results of geological setting and phase state evolution of water-dissolved gases during desolubilization and accumulation.关键词
四川盆地/川西坳陷/侏罗系/天然气/运移示踪指标/地层水/同位素组成Key words
Sichuan Basin/western Sichuan depression/Jurassic/natural gas/migration tracing parameters/formation water/, isotopic composition分类
能源科技引用本文复制引用
叶素娟,朱宏权,李嵘,杨映涛,黎青..天然气运移有机-无机地球化学示踪指标——以四川盆地川西坳陷侏罗系气藏为例[J].石油勘探与开发,2017,44(4):549-560,12.基金项目
国家科技重大专项“四川盆地碎屑岩层系油气富集规律与勘探评价”(2016ZX05002-004) （2016ZX05002-004）
