Main Controlling Factors of the Karst Dolomite Reservoir of Ma 5 Member in Daniudi Area

doi:10.11885/j.issn.1674-5086.2016.02.28.01

Abstract

Abstract: We discuss the main controlling factors of the karst dolomite reservoir of the Ma 5 Member in the Daniudi area, with the aim of understanding its complexity and diversity. Through core and thin section observation, and analysis of porosity and permeability properties, we studied the petrology, reservoir space, and physical properties of the dolomite reservoir. Based on this analysis, we constructed a reservoir identification standard using well logging data, and inferred the main controlling factors of the dolomite reservoir through logging interpretation, the residual thickness of crust, and the profile of connected wells. We concluded that:(1) the hollows in the karst topography were intensively corroded, and had developed into collapse breccias which display weak reservoir properties, and the karst upland reservoir is generally superior; (2) lithologic differences determine the extent of dolomite reservoir dissolution, with gypsum dolomite being simultaneously corroded and collapsed and it is distributed in a comparatively wide area. However, serious collapse may occur vertically, which contributes to karst development. Solution pores and cracks, which are conducive to reservoir development, can easily develop in gypsum-bearing dolomite; (3) different dolomitization causes dolomite reservoir heterogeneity. Micrite dolomite in the penecontemporaneous period is tight and more pore spaces have developed powder-fine dolomite. Both types are interbedded, which makes the reservoir vary greatly laterally, but relatively continuous horizontally.

Key words: Daniudi, Ma 5 Member, dolomite, karstification, dolomitization

CLC Number:

TE121

BAI Xiaoliang, ZHANG Shaonan, DING Xiaoqi, ZHAN Xiaohong, CHEN Quanjian. Main Controlling Factors of the Karst Dolomite Reservoir of Ma 5 Member in Daniudi Area[J]. 西南石油大学学报(自然科学版), 2017, 39(3): 23-33.

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