绿泥石环边胶结物对致密砂岩孔隙的保存机制—以川中-川南过渡带包界地区须家河组储层为例

doi:10.11743/ogg20090108

Abstract

Abstract:

The occurrence,forming conditions,and pore-preserving mechanism of chlorite rims in the Upper Triassic Xuejiahe Formation of Baojie area from central to southern Sichuan basin were studied in detail by means of thin section analysis and SEM analysis.The result shows that chlorite rims grew vertically on the grain surface and took the shape of isopachous grain-coating.This kind of cement was formed during the early diagenetic stage and was controlled mainly by depositional environment and provenance conditions.The presence of chlorite rims enhanced the compaction resistance of rock,inhibited quartz overgrowth on detrital-quartz grains,accelerated dissolution and formed excellent pore-throat configuration.Therefore,the chlorite rims played an important role in the preservation of residual primary pores in the tight sandstone reservoirs in the study area.

Key words: Chlorite rim, tight sandstone, pore preservation mechanism, Xujiahe Formation, Baojie area, Sichuan Basin

CLC Number:

TE122.2

Liu Jinku, Peng Jun, Liu Jianjun, Wang Yan, Liu Jianfeng. Pore-preserving mechanism of chlorite rims in tight sandstone—an example from the T₃x Formation of Baojie area in the transitional zone from the central to southern Sichuan Basin[J]. Oil & Gas Geology, 2009, 30(1): 53-58.

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Pore-preserving mechanism of chlorite rims in tight sandstone—an example from the T₃x Formation of Baojie area in the transitional zone from the central to southern Sichuan Basin

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Pore-preserving mechanism of chlorite rims in tight sandstone—an example from the T3x Formation of Baojie area in the transitional zone from the central to southern Sichuan Basin

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Pore-preserving mechanism of chlorite rims in tight sandstone—an example from the T₃x Formation of Baojie area in the transitional zone from the central to southern Sichuan Basin