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根据柴达木盆地西部凹陷区气源岩分布图、母质类型分布图以及成熟度分布图,编制了柴达木盆地西部第三系天然气成因类型分布图,并预测了各层段不同成因类型天然气的分布范围及其变化规律。上第三系油型气主要分布于茫崖凹陷东部、阿尔金斜坡和柴西南断陷区;上第三系煤型气主要分布于一里坪凹陷、三湖凹陷和鄂博梁—伊克雅乌汝构造带。下第三系油型气主要分布于茫崖凹陷西部和阿尔金斜坡;下第三系煤型气主要分布于茫崖凹陷东部、一里坪凹陷和鄂博梁—伊克雅乌汝构造带。将不同时代的天然气成因类型预测图叠置后发现,茫崖凹陷的东部和一里坪凹陷是高熟过熟阶段煤型气分布的主要区域。柴达木盆地西部第三系天然气成因类型预测图为柴西地区天然气地球化学研究和天然气勘探有利区带预测提供了科学依据。
Based on the gas source rock distribution, parent material type distribution map and maturity distribution map in the western sag of the Qaidam Basin, the genetic type distribution pattern of the Tertiary gas in western Qaidam Basin was compiled and the natural gas types of different genetic types The distribution and its variation. The Upper Tertiary oil-gas is mainly distributed in the eastern part of the Mangya sag, the Altun slope and the Qaidam fault zone. The Upper Triassic coal gas is mainly distributed in the Yiliping depression, the Sanhu depression and Ebo-le-Ikea Wu Ru tectonic belt. The Lower Tertiary oil gas is mainly distributed in the western part of the Mangya sag and the Altun Ramp. The Lower Tertiary coal gas is mainly distributed in the eastern part of the Mangya sag, the Yiliping sag and the Ebolai-Ikeyaurou tectonic belt. After superimposing natural gas formation prediction maps of different ages, it is found that the eastern part of Mangya sag and the Yiliping fault depression are the main regions of coal gas distribution in the mature overripe stage. Prediction maps of genetic type of Tertiary natural gas in western Qaidam Basin provide a scientific basis for natural gas geochemical research and gas zone favorable zone prediction in western Qaidam Basin.