川西地区须二段油气充注历史的流体包裹体分析

STUDY ON THE HYDROCARBON CHARGE HISTORY IN THE 2^(ND) MEMBER OF XUJIAHE FORMATION OF WEST SICHUAN BY EVIDENCE FROM FLUID IN CLUSIONS

认为对包裹体类型、赋存状态、成分以及热力学特征进行综合分析,可为油气运移期次的研究提供重要的依据。根据组成特征和荧光性分析结果指出,该地区包裹体主要包括盐水包裹体、烃类包裹体和有机固体包裹体。通过对烃类包裹体化学成分的分析,将其分为4种类型,不同类型的包裹体分别代表了油气充注的不同阶段。通过对川西地区须二段储层中包裹体的综合研究和结合该区地层埋藏史研究,将该区油气充注划分为4个阶段,即低熟生油充注阶段、成熟生油气充注阶段、过熟生气充注阶段和构造调整充注阶段。

The comprehensive analysis of type, occurrence, composition and thermodynamic characteristics of inclusions provides an important foundation for study on the hydrocarbon charge history. Based on the analysis of component and fluorescent characteristic, the inclusions had been divided into saline inclusions, hydrocarbon inclusions and asphalt inclusions. Though the analysis of composition of hydrocarbon inclusions, they had been divided into 4 types which represent 4 hydrocarbon charging processes. The comprehensive study on inclusions, integrated with burial history, show that regional hydrocarbon charging has gone through an evolution process of low-maturation stage, maturation stage, highmaturation stages and structural adjustment stage, which provide an foundation for the exploration and development of west Sichuan.