构造-热液白云岩化作用与白云岩储层

doi:10.11743/ogg20080510

Abstract

Abstract:

Sharing similar lithologic characteristics with dolomite seam hosting MVT Pb-Zn sulfide ores,hydrothermal dolomite reservoirs contains mainly massive-matrix-replacement dolomites and void-or fracture-filling saddle dolomite dotted with small amount of other hydrothermal ores,such as sphalerite,galena,quartz,pyrite, barite,and fluorite.Saddle dolomite-filling microfractures and zebra textures formed by shear stress and dolomite breccias are also common in these reservoirs.Unfilled vugs,fractures,and pores from differential dissolution of the original carbonates(mainly limestone)provide the necessary spaces for later hydrocarbon charges.The hydrothermal fluids preferentially flow upwards along the extensional and transtensional fault systems,where dolomitization preferentially occurs on the hanging walls and extends laterally in the course of fault propagation.The hydrothermal dolomite reservoir can be well characterized and predicted through high-resolution seismic attribute analysis and imaging.

Key words: extensional fault, transtensional fault, structural control, hydrothermal dolomite, dolomite reservoir

CLC Number:

TE122.2

Chen Daizhao. Structure-controlled hydrothermal dolomitization and hydrothermal dolomite reservoirs[J]. Oil & Gas Geology, 2008, 29(5): 614-622.

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Structure-controlled hydrothermal dolomitization and hydrothermal dolomite reservoirs

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