塔河地区寒武系储层深埋藏白云石化特征

doi:10.11743/ogg20100102

摘要/Abstract

摘要：

塔河地区寒武系白云岩具过渡型成岩演化环境成因特征。寒武纪碳酸盐沉积物在经历了短暂的早期成岩作用(海底成岩加大气淡水成岩作用)后,即进入埋藏成岩环境,经历了准同生白云岩—早成岩浅埋藏白云岩—晚成岩深埋藏白云岩—热液成因白云岩的成岩作用演化过程;裂缝、溶蚀孔(洞)是塔河地区寒武系不同类型白云岩的主要储集空间类型。深埋藏白云石化条件下的与深部断裂热液流体有关的溶蚀作用是塔河地区寒武系白云岩储层储渗空间形成的主要机制,而不同期次的充填和胶结作用的强度及热液溶蚀之后稳定的埋藏过程、较小的构造变动是有效储集空间得以保存的主控因素。

关键词: 热液溶蚀作用, 深埋藏白云石化, 储层, 寒武系, 塔河地区

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

中图分类号:

TE122.2

蔺军,周芳芳,袁国芬. 塔河地区寒武系储层深埋藏白云石化特征[J]. 石油与天然气地质, 2010, 31(1): 13-21,27. doi: 10.11743/ogg20100102 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. doi: 10.11743/ogg20100102

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