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鄂尔多斯盆地是一个稳定的克拉通,区内晚古生代经历了中晚石炭世近海平原至二叠纪内陆河流、湖泊三角洲两个沉积阶段,沉积地层中三角洲平原河道、三角洲前缘河口砂坝、潮道砂体等各种成因的砂体极为发育,砂体处于生烃源岩之上、或夹于生烃源岩之中,气源条件优越,形成大面积分布的低孔、低渗、低压、低丰度隐蔽性眇岩岩性气藏。近几年,针对该岩性气藏的勘探难点,开展了一系列攻关实验,总结了一套以地质评价、地震勘探、测井精细评价解释、试井压裂等为主体的勘探技术,有效地指导了上古生界天然气的勘探,发现了苏里格、榆林、乌审旗、米脂四个大气田。
The Ordos Basin is a stable craton. The Late Paleozoic experienced the middle and late Carboniferous offshore plains to the Permian inland rivers and lacustrine delta depositional stages, deltaic plains in the sedimentary strata, delta front mouth sand bar, Sand bodies such as tidal channel sand body and so on are very developed. The sand body is on top of the source rock or sandwiched between the source rock and source rock. The gas source is in good condition to form a large area of low porosity, low permeability, Low pressure, low abundance concealed 眇 rock lithologic gas reservoir. In recent years, a series of exploration experiments have been carried out to solve the difficulties in exploration of this lithologic gas reservoir, and a set of exploration techniques based on geological evaluation, seismic exploration, well logging evaluation, well testing and fracturing, etc. has been summarized. Guided the exploration of the Upper Paleozoic gas and discovered four large gas fields, Sulige, Yulin, Wushen Banner and Mizhi.