构造热液白云岩的研究进展及识别特征

Research Progress and Identification Characteristics of Structural Hydrothermal Dolomite

国内外对构造热液白云岩研究取得了大量成果,全球很多地区发现优质热液白云岩储层。本文对构造热液白云岩定义、研究现状、成因模式、识别特征等方面进行简要综述,热液流体通常在活跃的构造活动下沿断裂系统向上流动,遇到渗透性较差的隔挡层后侧向流入岩层,导致碳酸盐岩层发生白云岩化作用,形成构造热液白云岩;构造热液白云岩具有特殊的斑马状以及角砾状构造特征,鞍状白云石是构造热液活动的最常见的热液矿物,也是判别构造热白云化作用的关键标志,并且与各类热液矿物组合产出。

A lot of achievements have been obtained in the study of structural hydrothermal dolomite at home and abroad. High quality hydrothermal dolomite reservoirs have been found in many parts of the world. In this paper, the definition, research status, genetic model, identification characteristics of hydrothermal dolomite were reviewed. The hydrothermal fluid usually flows upward along the fault system under active structural activity, after encountering the barrier layer with poor permeability, it laterally flows into the rock formation, causing the dolomite formation in the carbonate rock layer to form structural hydrothermal dolomite. Structural hydrothermal dolomite has special zebra-like and breccia-like structural features. Saddle dolomite is the most common hydrothermal mineral in hydrothermal activity, and it is also a key indicator for judging the thermal dolomitization of the structure, and is produced in combination with various hydrothermal minerals.