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满东1气藏是塔里木盆地东部典型的致密砂岩气藏,但其成因机制研究亟待加强。利用流体包裹体岩相学观察、均一温度测试、定量颗粒荧光分析等手段厘定了油气充注史,应用储层孔隙度演化模型恢复了储层孔隙度演化史,并综合两者之间的关系明确了满东1致密气藏的成因类型和成藏机制。研究结果表明:满东1气藏天然气主要源自寒武系—中下奥陶统烃源岩,此气藏具有2期油气充注历史,即晚加里东—早海西期的石油充注和晚燕山期—喜马拉雅期以来的天然气充注;满东1气藏志留系柯坪塔格组储层在燕山末期致密化,形成现今的致密储层;喜马拉雅期,寒武系、奥陶系古油气藏内的原油裂解气在志留系储层中成藏,此时储层已致密化,即天然气充注期晚于储层致密期,因此满东1气藏的成因类型属于先致密后成藏型“致密深盆气藏”。综合分析后认为,满东1气藏原油裂解气勘探前景广阔,特别是下古生界具有良好的资源前景。
The Mandong-1 gas reservoir is a typical tight sandstone gas reservoir in the eastern part of the Tarim Basin. However, the research on its genesis mechanism needs to be strengthened. The history of oil and gas filling was determined by petrographic observation of fluid inclusions, homogenization temperature test and quantitative particle fluorescence analysis. The evolution of reservoir porosity was recovered by reservoir porosity evolution model, and the relationship between the two The type and mechanism of gas accumulation in the Mante 1 tight gas reservoir are clarified. The results show that the natural gas in Mandong-1 gas reservoir is mainly derived from the Cambrian-Middle-Lower Ordovician source rocks. This gas reservoir has two stages of oil and gas filling, namely, the late Caledonian-Early Hercynian oil charge And the late Yanshanian-Himalayan period. The reservoirs of the Kepingtag Formation in the Silurian 1 gas pool were densified at the end of Yanshan Formation to form today’s tight reservoirs. Himalayan, Cambrian, Ordovician, The crude oil pyrolysis gas in the ancient reservoir was accumulated in the Silurian reservoir. At this time, the reservoir has been densified, that is, the filling period of natural gas is later than that of the reservoir. Therefore, the genesis type of the Man-dong 1 reservoir belongs to the first After the accumulation of tight type “tight basin gas reservoir ”. After a comprehensive analysis, it is considered that there is a broad prospect of exploration for crude pyrolysis gas in Mandong-1 gas reservoir, especially, the Lower Paleozoic has a good resource prospect.