鄂尔多斯盆地靖边地区奥陶系天然气成藏机理及富集规律

发布时间：2018-03-13 16:38

本文选题：天然气　切入点：成藏机理　出处：《西安石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：鄂尔多斯盆地奥陶系是中国海相碳酸盐岩天然气勘探的重要领域,也是中国天然气增储上产的主要勘探层位。本文以鄂尔多斯盆地靖边地区为例,通过岩心观察、薄片鉴定、流体包裹体测定、天然气碳同位素分析、盆地演化模拟、古地貌恢复等方法,研究天然气运移特征,明确天然气成藏期次,建立天然气成藏模式,总结天然气富集规律。研究认为:鄂尔多斯盆地靖边地区奥陶系马五1段、马五2段、马五4段沉积相主要为云坪相和灰云坪相,属特低孔、特低渗致密型储集层;气藏为低含硫干气藏,不存在边、底水;主要为风化壳岩性-地层气藏和古地貌-岩性气藏。天然气主要来源于石炭-二叠煤系烃源岩,少部分来自奥陶系碳酸盐岩烃源岩。晚侏罗世-早白垩世末期,天然气在石炭-二叠系煤系烃源岩生烃增压的动力作用下,沿着古沟槽、不整合面,以垂向和侧向的运移方式,在斜坡风化壳以及古地貌中高部聚集成藏。天然气主要富集在5大要素耦合处:烃源岩展布区、云坪和灰云坪发育区、储层物性较好及厚度较大区域、本溪组底部泥岩分布、风化壳及古地貌中高部位。
[Abstract]:Ordovician is an important field of natural gas exploration for marine carbonate rocks in China, and is also the main exploration horizon for gas accumulation and production in China. In this paper, the Jingbian area of Ordos Basin is taken as an example. The methods of fluid inclusion determination, natural gas carbon isotope analysis, basin evolution simulation, paleogeomorphology restoration and so on are used to study the migration characteristics of natural gas, to determine the times of gas accumulation, and to establish the gas accumulation model. It is concluded that the sedimentary facies of Ordovician Ma51 member, Ma52 member and Ma-54 member of Ordovician in Jingbian area of Ordos Basin are mainly Yunping facies and lime-cloud flat facies, which belong to ultra-low porosity and ultra-low permeability tight reservoir. The gas reservoir is low sulfur bearing dry gas reservoir, no edge and bottom water, mainly weathered crust lithology-stratigraphic gas reservoir and paleogeomorphic lithologic gas reservoir. The natural gas is mainly derived from Carboniferous and Permian coal series source rocks. A few come from Ordovician carbonate source rocks. In the late Jurassic to the end of early Cretaceous, natural gas was transported vertically and laterally along the paleogeneration and unconformable surface under the dynamic action of hydrocarbon generation pressure of Carboniferous Permian coal series source rocks. The natural gas is mainly concentrated in the coupling areas of five major elements: the distribution of source rocks, the development of Yunping and lime-cloud flat areas, the good physical properties and thickness of reservoirs, the distribution of mudstone at the bottom of Benxi formation, and the accumulation of natural gas in the weathering crust and paleogeomorphology of the slope. Weathering crust and high position in paleogeomorphology.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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