鄂尔多斯盆地上古生界储层流体包裹体特征及其地质意义

doi:10.11743/ogg20060105

摘要/Abstract

摘要：

鄂尔多斯盆地上古生界储层流体包裹体按成因可以分为继承性(非成岩)和非继承性(成岩)包裹体两类。后者又可根据流体成分分为盐水包裹体、CO₂包裹体和烃类包裹体3亚类,每类均具有特定的地质意义。储层中发育两种颜色不同的荧光。流体包裹体中的液态烃类发蓝色、蓝灰色荧光;胶结物中的烃类发浅黄色、黄绿色荧光。前者代表了充注时的石油特征;后者为石油被破坏后的结果。液态烃类包裹体的PVT模拟计算表明,石油是在相对较高的温度(120℃)和较高的流体压力(38.49 MPa)环境下充注的,至现今储层温度、压力均发生了显著下降,从而导致储层油气性质发生了明显改变。

关键词: 流体包裹体类型, 荧光特征, 烃类充注, 鄂尔多斯盆地

Abstract:

Fluid inclusions in the Upper Paleozoic reservoirs in Ordos basin can be classified into 2 types, namely inherited (non-diagenetic) and non-inherited (diagenetic) inclusions, according to their genesis. Based on fluid composition, the latter can be further divided into 3 sub-types, including brine inclusion, CO₂ inclusion and hydrocarbon inclusion. Each inclusion type or sub-type has its own specific geological significance. The reservoirs show two kinds of fluorescence colors. The liquid hydrocarbons in the fluid inclusions show blue and bluish grey fluorescence colors, while the hydrocarbons in the cements show pale yellow and yellowish green fluorescence colors. The former represents the oil feature while it was charged, while the latter represents the results of oil destruction. PVT modeling of liquid hydrocarbon inclusions shows that hydrocarbons would have been charged at relatively high temperature (120℃) and relatively high fluid pressure (38.49 MPa), which are remarkably higher than the present temperature and pressure in the reservoirs, thus the hydrocarbon properties in the reservoirs have evidently been changed.

Key words: type of fluid inclusion, fluorescent characteristic, hydrocarbon charging, Ordos basin

中图分类号:

TE112.2

冯乔,马硕鹏,樊爱萍. 鄂尔多斯盆地上古生界储层流体包裹体特征及其地质意义[J]. 石油与天然气地质, 2006, 27(1): 27-32. doi: 10.11743/ogg20060105 Feng Quao,Ma Shuopeng,Fan Aiping. Characteristics of fluid inclusions in Upper Paleozoic reservoirs in Ordos basin and their geological significance[J]. Oil & Gas Geology, 2006, 27(1): 27-32. doi: 10.11743/ogg20060105

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