鄂尔多斯盆地上古生界天然气成藏的地质特征

总结了天然气成藏的地质特征，目的是预测盆地内有利的天然气勘探区块。综合采用野外露头观察、钻井岩芯观察和室内分析研究等方法。研究表明，盆地晚古生代多种沉积体系发育，奠定了气藏的物质基础；沉积层序的演化控制了气源岩、储集层和盖层的发育及其空间组合；持续供气的气源岩、大范围分布的致密砂岩储集层、多因素封盖、就近成藏和成藏期晚等因素的综合作用有利于鄂尔多斯盆地上古生界天然气藏的形成和保存。指出盆地内5个有利的天然气勘探区块。

Geological Features of Natural Gas Pool Formation in the Upper Paleozoic Erathem in the Erdos Basin

Geological features of natural gas pool formation were summarized in order to predict favorable exploration tract of natural gas in the Erdos Basin. Observation of outcrops, observation of drill core and indoor analysis were adopted synthetically. The study shows that the development of multiple sedimentary systems in the later Paleozoic laid a material foundation of gas pool in the basin. Evolvement of sedimentary sequence dominated development of gas source rocks, reservoirs, caprocks and their dimensional combination. Integrative function of all the factors, such as, continuously exhausting gas source rocks, large scope distributed dense sandstone reservoirs, multi-factors sealing capabilities, short distance transportation and late forming stage of gas pool etc., were propitious for forming and conservation of natural gas pool in the Upper Paleozoic Erathem in the Erdos Basin. As a result, 5 profitable prospecting tracts of natural gas were pointed out in the Erdos basin.