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首页> 外文期刊>Chinese Journal of Geochemistry >Origin of natural gases and their differences between the eastern and western parts of central Tarim Basin
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Origin of natural gases and their differences between the eastern and western parts of central Tarim Basin

机译：塔里木盆地中东部东西部天然气成因及其差异

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摘要

The origin of natural gases in central Tarim Basin is very complicated and there has been no definite conclusion in this aspect. Based on the results of systematic research on their composition and carbon isotopic characteristics, natural gases in central Tarim Basin are composed mainly of hydrocarbon gas, Ordovician natural gas with the characteristics of crude oil-cracking gas, and Carboniferous natural gas not only originating from kerogen cracking, but also from oil cracking. There are significant differences in composition and carbon isotope of natural gases between the eastern and western areas. The causes for the differences in geochemical characteristics of natural gases are presented as follows: different thermal evolution degrees of organic matter. Natural gases in the western region may have generated from the Middle-Upper Ordovician source rocks, and natural gases in the eatern region may be derived from the Cambrian source rocks, which entered into high to over mature stages; the gases migrated from west to east and caused the different compositional and carbon isotopic characteristics of natural gases; difference in the strength of thermal sulfate reduction between the eastern and western parts, with the reduction in the eastern part being stronger than that in the western part.
机译：塔里木盆地中部的天然气成因非常复杂，在这方面尚无定论。根据对其组成和碳同位素特征的系统研究结果，塔里木盆地中部的天然气主要由烃类气体，具有原油裂化气特征的奥陶纪天然气和石炭系天然气组成，不仅来源于干酪根裂解，也来自石油裂解。东部和西部地区之间天然气的组成和碳同位素存在显着差异。天然气地球化学特征差异的原因如下：有机质热演化程度不同。西部地区的天然气可能来自中上奥陶统烃源岩，而东部地区的天然气可能来源于寒武系烃源岩，这些烃源岩已进入高成熟阶段。气体由西向东迁移，引起天然气的不同组成和碳同位素特征；东部和西部的热硫酸盐还原强度差异较大，东部的还原强度强于西部。

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