塔河地区寒武系储层深埋藏白云石化特征

doi:10.11743/ogg20100102

Abstract

Abstract:

The Cambrian dolomites in the Tahe region have genetic features of transitional diagenetic environment.After a short-time early diagenetic period(sea-bed diagenesis and meteoric water diagenesis),the Camb-rian carbonate deposits went into burial diagenetic period,going through a diagenetic process from penecomtemporaneous dolomite to early diagenetic and shallow burial dolomite,to late diagenetic and deep burial dolomite,and finally to hydrothermal dolomite.Fractures and dissolved vugs(caves)are the main types of reservoir space of various Cambrian dolomites in the Tahe region.The major mechanism of the development of reservoir space of the Cambrian dolomites in the Tahe region is dissolution related to hydrothermal fluid flow through deep faults under deep-burial dolomitization background.And the main controlling factors responsible for the preservation of reservoir space are the intensity of filling and cementation in various periods,stable burial process after hydrothermal dissolution and relatively minor tectonic events.

Key words: hydrothermal dissolution, deep burial dolomitization, reservoir, Cambrian, Tahe region

CLC Number:

TE122.2

Lin Jun, Zhou Fangfang, Yuan Guofen. Features of deep-burial dolomitization of the Cambrian reservoirs in Tahe region[J]. Oil & Gas Geology, 2010, 31(1): 13-21,27.

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Features of deep-burial dolomitization of the Cambrian reservoirs in Tahe region

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