A study of paleo-fluid potential from inclusions in the 2<sup>nd</sup>member of Xujiahe Formation in northwestern Sichuan

Xu Hao; Tang Dazhen; Wei Guoqi; Wu Shixiang; Zhang Junfeng

doi:10.11743/ogg20040520

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A study of paleo-fluid potential from inclusions in the 2^ndmember of Xujiahe Formation in northwestern Sichuan
Vol. 25, Issue 5, Pages: 582-585(2004)
Online First：25 October 2004，

Published：2004
DOI： 10.11743/ogg20040520
稿件说明：

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DOI：

Xu Hao, Tang Dazhen, Wei Guoqi, et al. A study of paleo-fluid potential from inclusions in the 2^ndmember of Xujiahe Formation in northwestern Sichuan[J]. 2004, 25(5): 582-585. DOI: 10.11743/ogg20040520. DOI：

摘要

有机包裹体的岩石学、热力学特征以及组成成分的对比分析表明

川西北地区须家河组二段储层中的包裹体可划分为4个期次

分别形成于三叠纪末到沙溪庙期、晚侏罗世中-晚期到早白垩世早期、早白垩世至喜山期前及喜山期后

代表了4次油气的充注过程。应用流体包裹体的分析资料

可获得包裹体被捕获时的古高程、密度、压力等基础数据。依照这些数据可求得古流体势

使用这一方法计算了川西北地区须家河组二段的古流体场

结果表明

燕山期区域流体场明显经历了变动-调整-再变动-再调整的历史演化过程。

Abstract

Comparative analyses of petrology

thermodynamic characteristics and components of inclusions in the 2

member of Xujiahe Formation in northwestern Sichuan show that the inclusions had been formed in 4 different stages

i.e.in Late Triassic to Shaximiao age

middle-late Late Jurassic to early Early Cretaceous

Early Cretaceous to pre-Himalayan

and post-Himalayan

respectively

which represent 4 hydrocarbon charging processes.Analysis of the fluid inclusions can reveal paleo-elevation-density and-pressure when the inclusions were entrapped.These data can be used to calculate the fossil fluid potential.This method has been used to calculate the fossil fluid field of the 2 ndmember of Xujiahe Formation in northwestern Sichuan.The results show that regional fluid field obviously has gone through an evolution process of variation adjustment revariation-readjustment.