A discussion on the hytrocarbon geochemical characteristics and anomaly genesis in the northern Tarim basin

被引：0
|
作者：
Zhou Y. [1 ,2 ]
Yang Z. [1 ]
Zhang S. [1 ,2 ]
Zhang F. [1 ,2 ]
Sun Z. [1 ,2 ]
机构：
[1] Institute of Geophysical and Geochemical Exploration, CAGS, Hebei, Langfang
[2] Key Laboratory of Geochemical Cycling of Carbon and Mercury in Earth's Critical Zone, CAGS, Hebei, Langfang
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2022年 / 96卷 / 07期
关键词：
acidolysis hydrocarbons; altered carbonates; carbon isotope; fluorescence spectra; oil and gas geochemical mapping; Tarim basin; top-air hydrocarbons;
D O I：
10.19762/j.cnki.dizhixuebao.2022221
中图分类号：
学科分类号：
摘要：
In order to develop the strategic role of "quickly grasping the overall situation and rapidly reducing the target area" and serve the national sweeping plan for oil and gas geochemical exploration, low density (one point/25km2) oil and gas geochemical mapping project was carried out in the northern part of Tarim petroliferous basin. Geochemical provincial anomalies are developed above large oil and gas fields and gas enrichment zones in terms of soil acidolysis hydrocarbons, top-air hydrocarbons, fluorescence spectra, ultraviolet absorption spectra and altered carbonates, and the plane spatial distribution of the anomalies have a good nesting relation with the underground oil and gas accumulation zones, which is of indicative significance for oil and gas accumulation. The anomalous concentration center of the regional fluorescence spectra and other indicators along the main fault zone as the Luntai fault indicates the large-scale migration and accumulation of oil and gas with the good matching of the underground fault location. Carbon isotope of methane confirms that the anomalies of oil and gas geochemical province in the study area are pyrolysis origin, and three-dimensional fluorescence of soil samples have common peaks, which reflects that the near-surface hydrocarbon anomalies are related to underground hydrocarbon migration and reservoir types. The experimental results of petroleum geochemical mapping in northern Tarim basin show that very low density petroleum geochemical mapping technology can be used in large-scale basins to delineate strategic prospects for large, medium-sized oil-gas fields and anomalous region of oil-gas enrichment zones, which can play a strategic role to oil and gas geochemical exploration in "rapidly grasping the overall situation and rapidly reducing target areas". © 2022 Geological Society of China. All rights reserved.
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页码：2547 / 2561
页数：14
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