鄂尔多斯盆地上古生界低渗岩性气藏综合勘探技术(英文)
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摘要
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 whose late Paleozoic undergoes two sedimentary stages: from the middle- late Carboniferous offshore plain to the Permian continental river and lake delta. Sandstones in delta plain channels, delta-front river mouth bars and tidal channels are well developed. The sandstones are distributed on or between the genetic source rocks, forming good gas source conditions with widespread subtle lithologic gas pools of low porosity, low permeability, low pressure and low abundance. In recent years, a series of experiments has been done, aimed at overcoming difficulties in the exploration of lithologic gas pools. A set of exploration techniques, focusing on geological appraisal, seismic exploration, accurate logging evaluation and interpretation, well testing fracturing, has been developed to guide the exploration into the upper Paleozoic in the basin, leading to the discoveries of four large gas fields: Sulige, Yulin, Wushenqi and Mizhi.
The Ordos basin is a stable craton whose late Paleozoic undergoes two sedimentary stages: from the middle- late Carboniferous offshore plain to the Permian continental river and lake delta. Sandstones in delta plain channels, delta-front river mouth bars and tidal channels are well developed. The sandstones are distributed on or between the genetic source rocks, forming good gas source conditions with widespread subtle lithologic gas pools of low porosity, low permeability, low pressure and low abundance. In recent years, a series of experiments has been done, aimed at overcoming difficulties in the exploration of lithologic gas pools. A set of exploration techniques, focusing on geological appraisal, seismic exploration, accurate logging evaluation and interpretation, well testing fracturing, has been developed to guide the exploration into the upper Paleozoic in the basin, leading to the discoveries of four large gas fields: Sulige, Yulin, Wushenqi and Mizhi.
引文
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