从模拟实验看致密砂岩储层的石油成藏条件

doi:10.11743/ogg20080603

Abstract

Abstract:

A study on critical geological conditions for oil pooling in inversed oil/water distribution in tight sands is carried out through various serial physical simulated experiments. The result shows that,for crude with density of about 0.8g/cm³,a stable inversed oiL/water distribution may occur when the pore throat radius of different capillarity glass tubes made of the same material are 1.8 mm or the grain diameters in sand-column are smaller than 0.35-0.40mm. The phenomenon is thought to be related with the equilibrium between buoyancy (flota-tion) and capillary force and oil density plays a more important role than that of the interfacial tension in the formation of this inversed oil/water distribution. Therefore, it is suggested that the formation of oil pools with inversed water/oil distribution in tight sandstone is subject to the pore radius of reservoir sands and its relationship wish the density of crude oil.

Key words: oil/water inversion, pore throat radius, pooling condition, simulated experiment, tight sand reservoir

CLC Number:

TE122.2

Xiao Zhihua, Zhong Ningning, Huang Zhilong, Jiang Zhenxue, Liu Yan. A study on hydrocarbon pooling conditions in tight sandstones through simulated experiments[J]. Oil & Gas Geology, 2008, 29(6): 721-725.

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A study on hydrocarbon pooling conditions in tight sandstones through simulated experiments

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