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

Abstract

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

CLC Number:

TE112.2

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.

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Characteristics of fluid inclusions in Upper Paleozoic reservoirs in Ordos basin and their geological significance

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