川西前陆盆地南部储层流体包裹体特征及其在天然气成藏研究中的应用

doi:10.11743/ogg20050618

摘要/Abstract

摘要：

川西前陆盆地南部邛西、平落坝及白马庙气田上三叠统原生气藏和侏罗系次生气藏储集层有机包裹体以气相、气液两相为主,形态多不规则,大小以3～6μm为主,主要分布在石英颗粒裂隙及充填裂缝的方解石脉中。须家河组二段有机包裹体均一温度分布范围为60～170℃,主峰在90～130℃;侏罗系有机包裹体均一温度范围在70～130℃,主峰为80～100℃。根据均一温度测试结果,结合三叠系烃源岩演化史分析,须家河组二段气藏经历了印支晚期少量油气充注,燕山期的大量油气充注及喜马拉雅期的调整、少量充注的全过程,其主要充注时期为燕山期(侏罗纪—白垩纪)。侏罗系气藏为次生气藏,主要充注时期为喜马拉雅期。通过恢复不同时期包裹体的古流体势,认为川西前陆盆地南部须家河组二段气藏流体势呈无序性。天然气运移以源、储之间的垂向运移为主,侧向运移不明显。

关键词: 流体包裹体, 充注期次, 运移方向, 川西前陆盆地南部

Abstract:

In the Upper Tertiary primary gas reservoirs and Jurassic secondary gas reservoirs in Qiongxi,Pingluo-ba and Baimamiao gas fields in southern West Sichuan foreland basin,organic inclusions are mainly in gas phase and gas-fluid biphase.They are usually irregular in shape,with dominant size in the range of 3-6 μm, and are mainly distributed in the fissures of quartz grains and in the calcite veins.The homogenization temperature of the fluid inclusions in the 2nd member of Xujiahe Fm is in the range of 60-170℃,with the main peak to be 90-130℃,while that in Jurassic is in the range of 70-130℃,with the main peak to be 80-100℃.Based on the results of homogenization temperature and in combination with the analysis of evolutional history of Triassic source rocks,it is believed that the charging of gas in reservoirs in the 2nd member of Xujiahe Fm is earlier than that in Jurassic gas reservoirs.The gas reservoirs in the 2nd member of Xujiahe Fm has experienced a complete hydrocarbon charging process from small amount of charging in late Indosinian,to large amount of charging in Yanshanian and to adjustment and minor charging in Himalayan,of which Yanshanian(Jurassic-Cretaceous)is the major charging period.The Jurassic gas reservoirs are secondary gas accumulations,with Himalayan as the main charging period.Based on reconstruction of palaeo-fluid potentials of inclusions formed in different geologic periods,it is believed that the fluid potentials of gas reservoirs in the 2nd member of Xujiahe Fm in southern West Sichuan foreland basin are in random distribution.Gas migration is dominated by vertical migration between source rocks and reservoir rocks with unevident lateral migration.

Key words: fluid inclusion, charging period, migration direction, southern West Sichuan foreland basin

中图分类号:

TE112.1

张莉,柳广弟,谢增业,等. 川西前陆盆地南部储层流体包裹体特征及其在天然气成藏研究中的应用[J]. 石油与天然气地质, 2005, 26(6): 800-807. doi: 10.11743/ogg20050618 Zhang Li,Liu Guangdi,Xie Zengye,et al. Characteristics of fluid inclusions in reservoirs and its application in study of natural gas reservoiring in southern West Sichuan foreland basin[J]. Oil & Gas Geology, 2005, 26(6): 800-807. doi: 10.11743/ogg20050618

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