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通过对鄂尔多斯盆地北部塔巴庙地区上古生界地层压力的分布规律、压力历史恢复及其与产气性关系的详细分析,认为上古生界气藏现今属异常低压-常压气藏,各气藏及同一气层的不同区域多为不同的压力系统,气藏横向连通范围有限,与阿尔伯达埃尔姆沃斯地区典型的的深盆气藏有较大的区别;上古生界烃源岩流体压力的演化历史恢复结果及平衡深度法计算证实上古生界泥岩在最大埋深时(早白垩世末)古压力系数达1.46~1.62;现今上古生界储层的异常低压是由历史中的古高压演化而成的,目前塔巴庙地区上古生界为一个高低压相间共存的复杂压力系统;区域压力封盖层——上石盒子组控制了上古生界天然气成藏,目前发现的天然气在纵向上集中分布于下石盒子组、山西组及太原组;上古生界气层压力与气层分布、无阻流量、物性、气藏流体特征有较密切的关系,相对高压力的盒3段、盒2段、太原组为较有利层段,92%的高产气井分布在压力系数大于0.95的区域内,地层压力较低的山1段产气性较差。研究资料显示盒3、2段有明显的富集成藏过程。盒3、2段为下生上储富集型气藏,太2段表现为自生自储近距离聚集型气藏。
Based on the detailed analysis of the distribution of pressure in the Upper Paleozoic and the relationship between pressure history and gas generation in Tabamiao area in northern Ordos Basin, it is considered that the Upper Paleozoic gas reservoirs are now characterized by abnormal low pressure - atmospheric reservoirs and gas There are mostly different pressure systems in different regions of the same reservoir and in the same gas layer. There is a limited range of lateral connectivity of gas reservoirs, which is quite different from the typical deep-basin gas reservoirs in Elmworth, Alberta. The Upper Paleozoic hydrocarbon source The evolution history of rock fluid pressure and the results of equilibrium depth method confirm that the Paleocene mudstone at the maximum buried depth (Late Cretaceous) has an ancient pressure coefficient of 1.46-1.62. Nowadays, the anomalous low pressure in Upper Paleozoic reservoirs is controlled by historical At present, the Upper Paleozoic in the Tabamiao area is a complex pressure system in which high and low pressure phase coexist. The regional pressure capping layer, Upper Shihezi Formation, controlled the gas accumulation in the Upper Paleozoic, The natural gas is mainly concentrated in Xiashihezi Formation, Shanxi Formation and Taiyuan Formation in the longitudinal direction. The Upper Paleozoic gas pressure is closely related to the distribution of gas layers, unobstructed flow, physical properties and fluid characteristics of gas reservoirs. 3 for the high pressure section of the cartridge, the cartridge segments 2, advantageously Taiyuan group intervals, 92% of the production Gas pressure coefficient distribution in the region of greater than 0.95, formation pressure lower mountain zone product gas 1 is poor. Research data show that box 3 and 2 have obvious enrichment and accumulation processes. Box 3, paragraph 2 is the next generation of reservoir-rich reservoirs, too 2 shows the self-storage of self-storage near-distance gas reservoir.