滨里海盆地肯基亚克地区中、下石炭统碳酸盐岩储层特征与成岩作用

doi:10.11743/ogg20120209

Abstract

Abstract:

By using core,thin section,SEM,porosity,permeability and geochemical data,this paper studied rock types,reservoir spaces and diagenesis of the Lower-Middle Carboniferous carbonate rocks in the coring interval of well A in Kenkyak area,Pre-Caspian Basin.The Lower-Middle Carboniferous carbonate reservoirs are grainstones and micrites of open platform facies with strong vertical heterogeneity and can be divided into two types,ClassⅠand ClassⅡ.The Class I is high quality reservoir with intergranular dissolved pores and intragranular dissolved pore as the main pore types.In contrast,the ClassⅡis moderate to poor reservoirs with pores dominated by intercrystalline pores and intercrystalline dissolved pores.Cementation and dissolution are the main diagenesis processes controlling the two types of reservoirs.The cementation mainly includes bladed-fibrous calcite cementation in normal seawater diagenetic environment and mosaic-granular-subhedral calcite cementation in burial diagenetic environment.The dissolution includes meteoric dissolution and burial dissolution,with the latter being critical for the formation of classⅠreservoir.The cementation is well developed in the classⅡ reservoir.

Key words: diagenesis, carbonate reservoir, Carboniferous, Kenkyak area, Pre-Caspian Basin

CLC Number:

TE122

Wang Rui, Zhu Xiaomin, Chen Yefei, Li Kongchou. Diagenesis and reservoir characteristics of the Lower-Middle Carboniferous carbonates in Kenkyak area,Pre-Caspian Basin[J]. Oil & Gas Geology, 2012, 33(2): 225-235.

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Diagenesis and reservoir characteristics of the Lower-Middle Carboniferous carbonates in Kenkyak area,Pre-Caspian Basin

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