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Pore-preserving mechanism of chlorite rims in tight sandstone——an example from the T_3x Formation of Baojie area in the transitional zone from the central to southern Sichuan Basin

Liu Jinku1,Peng Jun2,Liu Jianjun3,Wang Yan1,Liu Jianfeng1(1.Postgraduate School,Southwest Petroleum University,Chengdu,Sichuan 610500,China;2.Scientific Research Department,Southwest Petroleum University,Chengdu,Sichuan 610500,China;3.SINOPEC Northwest Company,Urumqi,Xinjiang 830011,China)  
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.
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