煤层气成藏机理及气藏类型划分——以鄂尔多斯盆地东缘为例

发布时间：2018-01-17 20:24

本文关键词：煤层气成藏机理及气藏类型划分——以鄂尔多斯盆地东缘为例　出处：《天然气工业》2017年08期 　论文类型：期刊论文

【摘要】：随着我国煤层气勘探开发工作的不断深入,定义和归纳赋存状态多样化的煤层气藏,并据此指导煤层气有利勘探目标优选就显得愈发重要。为此,在系统梳理国内外煤层气富集成藏理论的基础上,结合鄂尔多斯盆地东缘煤层气勘探开发的地质规律,借鉴常规油气藏按照圈闭成因进行分类的方法,提出了煤层气圈闭的概念和煤层气藏类型的划分方案。研究成果包括:①结合煤层、砂岩、泥岩和石灰岩在垂向上的组合关系,刻画了"泥裹藏、砂通煤、水包气"的气体封闭样式,"泥裹藏"即以泥岩等致密岩层封闭煤储层而成藏,"砂通煤"即上覆砂岩与煤层连通而与煤层统一形成气藏,"水包气"即在水力封闭和水力封堵作用下,气体在煤层中富集而成藏;②阐释了物性封闭、气压封闭、水压封闭和吸附封闭在煤层气藏形成过程中的作用,指出气藏开发的上、下限分别为风氧化带和地应力转折带;③提出了以构造、岩性、水动力和复合型圈闭为主导的气藏类型划分方案,并分别解剖了背斜、断层、向斜、地层—岩性、水力封堵和水力辅助型煤层气藏。
[Abstract]:With the development of coalbed methane exploration and development in China, it is more and more important to define and induce coalbed methane reservoirs with diversified occurrence states, and to guide the optimal selection of favorable exploration targets for CBM. On the basis of systematically combing the theory of coalbed methane accumulation at home and abroad and combining with the geological law of coalbed methane exploration and development in the eastern margin of Ordos Basin, the method of classifying conventional oil and gas reservoirs according to trap origin is used for reference. The concept of coalbed methane trap and the classification scheme of coalbed methane reservoir type are put forward. The research results include the combination relationship of "1: 1 combined coal seam, sandstone, mudstone and limestone in vertical direction", which depicts "mud-wrapped reservoir and sand coal." The gas sealing style of water and gas is "mud-wrapped reservoir", which is formed by sealing coal reservoir with mudstone and other tight rock formations, and "sand and coal" means that the overlying sandstone connects with coal seam and forms a gas reservoir unified with coal seam. "Water in gas" is the accumulation of gas in coal seam under the action of hydraulic sealing and hydraulic plugging. (2) explain the effect of physical property seal, pressure seal, water pressure seal and adsorption seal on the formation of coalbed methane reservoir, and point out that the upper and lower limits of gas reservoir development are wind oxidation zone and in-situ stress transition zone respectively; (3) the classification scheme of gas reservoir types, which is dominated by structure, lithology, hydrodynamic and composite traps, is proposed, and anticline, fault, syncline, stratigraphic lithology, hydraulic plugging and hydraulically assisted coalbed methane reservoir are dissected respectively.
【作者单位】：中国矿业大学(北京)地球科学与测绘工程学院;中联煤层气有限责任公司;
【基金】：国土资源部公益性行业科研专项(编号:201311015-01)
【分类号】：P618.13
【正文快照】： 天然气藏分类的国标(GB/T 26979—2011)中,以圈闭类型、储层特征等单因素和多因素组合为划分指标,定义了常规气藏、凝析气藏和非常规气藏的分类标准。其中,按照圈闭类型(构造、岩性、地层和裂缝气藏)定义的气藏组合是最为常见的勘探分类标准,其划分依据主要考虑储集体的几何形

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