Diagenesis and Porosity Evolution of Carboniferous KT-Ⅱ Carbonates in Zanazor, Kazakhstan

Abstract

Abstract:

The carbonates of KT-Ⅱ layer in Carboniferous are the main layer of exploration and development of Zanazor Oilfield. The research of diagenesis is of great significance to influence the pore evolution of reservoir. Based on the observation of thin sections, and geochemical analysis on carbon oxygen isotope, cathodoluminescence, and fluid inclusion, we expound the main diagenesis types, the diagenetic sequence and its influence on pore evolution of KT-Ⅱ layer in the study area, and draw the following conclusions: (1) The diageneses which have obvious effects on reservoir quality include compaction, pressolution, cementation, dissolution and cataclasis, etc.; (2) There are two kinds of diagenetic evolution pattern and pore evolution model: the sparry grain limestone in shoal and mud limestone in tidal flat. Furthermore, the former can be subdivided into sparry foraminifera-fusulinida limestone and sparry arene-oolitic limestone; (3) The diagenesis is one of the main controlling factors of reservoir quality. The difference of rock types (controlled by sedimentary micro environment) determines the differentia in early diagenetic response, which affects the late diagenetic reconstruction, and controls the formation of differential reservoir. Therefore, in terms of the control on the differential distribution of reservoir performance, the diagenetic alteration which is on the basis of sedimentary and depositional conditions are of equal importance.

Key words: Zanazor, Carboniferous, diagenesis, diagenetic sequence, porosity evolution

CLC Number:

TE122.2

YI Shuo, HUANG Wenhui, JIN Zhenkui, GAO Baishui, ZHU Xiaoer. Diagenesis and Porosity Evolution of Carboniferous KT-Ⅱ Carbonates in Zanazor, Kazakhstan[J]. Geoscience, 2017, 31(04): 791-801.

Figures/Tables 7

Fig.1 Location of Zanazor(Adapted from Hao Fang, 2010)

Fig.2 Comprehensive column of Carboniferous strata in Zanazor(Adapted from YONG Tianshou, 2003)

Fig.3 Characteristics of compaction and pressolution of Carboniferous KT-Ⅱ carbonates in Zanazor

Fig.4 Characteristics of cementation of Carboniferous KT-Ⅱ carbonates in Zanazor

Fig.5 Characteristics of denudation and cataclasis of Carboniferous KT-Ⅱ carbonates in Zanazor

Fig.6 Schematic diagrams of diagenesis and pore evolution of sparry grainstone in shoal

Fig.7 Diagenetic sequence and porosity evolution of the KT-Ⅱ layer of Carboniferous in Zanazor

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