Predicting the Distribution of Natural Gas Genetic Types in Tertiary Formation in West Qaidam Basin
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摘要: 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。Abstract: Based on the maps showing the distributions of gas source rocks, organic types and muturity, we compiled the maps predicting the distribution of Tertiary natural gas genetic types in the west of the Qaidam basin and forecasted the distribution and variation of genetic types of natural gases from stratigraphically different members. The Upper Tertiary oil-type gas is mainly positioned in the east of the Mangai depression, the Aljin slope and the Southwestern faulted depression, while the Upper coal-type gas in the Yiliping depression, the Sanhu depression and the Erboliang-Yikeyawuru structural belt. The Lower Tertiary oil-type gas is mainly positioned in the west of the Mangai depression and the Aljin slope, while the Lower coal-type gas in the east of the Mangai depression, the Yiliping depression and the Erboliang-Yikeyawuru structural belt. Overlapping the maps, we will find that the east of Mangai depression and the Yiliping depression are the area where the high and over mature coal-type gases are mainly located.The maps lay a scientific foundation for researching natural gas geochemistry and predicting the prospecting area of natural gas exploration.
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Key words:
- prediction /
- distribution of natural gas genetic types /
- Tertiary /
- Qaidambasin
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