四川盆地北部栖霞组-茅口组热液白云岩特征与成因

doi:10.11743/ogg20120314

Abstract

Abstract:

Taking outcrop dolomites in Guangyuan Xiagou coal mine in northern Sichuan Basin as an example,this paper studies the characteristics and genesis of hydrothermal dolomite reservoir.From the bottom to the top of the outcrop cross section,the dolomitization gradually enhances;the color of rocks changes from dark to light;the lithologies change from bioclastic limestones to patchy dolostones,then to medium-and coarse-grained dolomites,and end up with the Maokou Formation marlstones.The medium-to coarse-grained dolomites occur at the top of the Qixia Formation and the bottom of the Maokou Formation,and are composed of medium-to coarse-grained subhedral or euhedral dolomites and some saddle-like dolomites.Dissolved caverns and pores are well-developed and filled with asphaltares.The δ¹³C value (PDB) and δ¹⁸O value (PDB) of micritic limestones are 3.23‰ and -5.03‰,respectively.The δ¹³C value (PDB) and δ¹⁸O value (PDB) of the dolomites are 3.29~4.14‰ and -6.07~-6.75‰ respectively.Fluids may be sourced from magmatic hydrothermal fluid,or meteoric water experiencing deep circulation.The deep hydrothermal fluids migrated up along open faults and slowed down or even stopped when arriving at the Qixia and Maokou Formations due to the sealing of marl and politic dolostones in the Wu Jiaping Formation.The stagnant thermal fluids caused dolomitization dissolution of the surrounding rocks.Therefore, it is possible that hydrothermal dolomite reservoirs occur at the top of Qixia Formation and the bottom of Maokou Formation.

Key words: hydrothermal dolomite, dissolution pore, fracture, reservoir, Middle Permian, Sichuan Basin

CLC Number:

TE122.2

Shu Xiaohui, Zhang Juntao, Li Guorong, Long Shengxiang, Wu Shixiang, Li Hongtao. Characteristics and genesis of hydrothermal dolomites of Qixia and Maokou Formations in northern Sichuan Basin[J]. Oil & Gas Geology, 2012, 33(3): 442-448,458.

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Characteristics and genesis of hydrothermal dolomites of Qixia and Maokou Formations in northern Sichuan Basin

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