Abstract
Hydrothermal activity played an important part in the formation of the Ordovician dolostone reservoirs in Tadong area (eastern Tarim Basin). By applying the technologies of thin rock section microscopic identification, cathodoluminescence analysis, carbon and oxygen isotope analysis, trace element, rare earth element analysis, among others, the mineralogical characteristics and geochemical characteristics of the hydrothermal process are studied. It can have seen that the Ordovician hydrothermal process has represented by dolomite in various forms in the aspect of petrology and mineralogy. It is mainly composed of medium-megacryst crystalline dirty dolomite and powder-megacryst crystalline cleaner dolomite. The geochemical characteristics are the hydrothermal origin, medium-megacryst crystalline dirty dolomite with lower δ18O value, high Mn-Fe content, and positive Eu anomaly. The powder-megacryst crystalline has cleaner dolomite, with higher δ18O value, the Mn content low, and the negative Eu anomaly. Provide a reference for the Ordovician carbonate in Tadong area oil and gas exploration in the study.
Highlights
The hydrothermal process is an important geological function for the formation of a carbonate reservoir
The typical hydrothermal carbonate reservoir has been found in the Sichuan basin and Tarim Basin (Jiao & Xing, 2011; Gu, 2000; Zhao et al, 2014; Huang & Liu, 2013; Zhang et al, 2009)
Based on the thin section, cathodoluminescence, carbon and oxygen isotope, trace element and rare earth elements analysis, this paper studies the hydrothermal process of Ordovician carbonate in Tadong area, establishes litho mineralogical and geochemical identification marks of the hydrothermal process
Summary
The hydrothermal process is an important geological function for the formation of a carbonate reservoir. According to the thin section and cathodoluminescence analysis technology, in Tadong area more than 200 thin section samples of Ordovician, 13 wells have analyzed and found that the Ordovician hydrothermal action formed various forms of dolomite; they can be medium-megacryst crystalline dirty dolomite (Figure 2a).
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