我国煤层气赋存特点及抽采技术研究——祁猛

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祁猛 我国煤层赋存特点及抽采技术研究

我国煤层气赋存特点及抽采技术研究

摘 要

中国煤层气资源十分丰富,特点表现为含煤盆地多、含煤层系多、煤种全、煤层气藏类型多。埋藏深度浅于1 000 m的资源量达14.27×1012m3,是目前煤层气开发的主要对象。当前国家配套扶持政策基本到位,是我国发展煤层气的重要机遇期。加快煤层气发展,首先要认识其赋存特点,选准富集区,探好目标区。近年来的研究成果表明,中国煤层气主要富集在5类地区:区域含煤区构造高点、直接盖层稳定分布的上斜坡区、凹中隆构造的火山岩活动区、浅层封闭条件好的低煤阶与厚煤层发育区、断裂活动次生割理发育区。目前,我国尚处于煤层气开发的初期,勘探开发前景广阔。通过对不同煤阶具体指标的分析并结合上述5类富集区的特点,提出了Ⅰ类目标区6个、Ⅱ类目标区5个、Ⅲ类目标区7个。其中沁水盆地南部晋城地区、鄂尔多斯盆地东南部吉县—韩城地区、准噶尔盆地东南部昌吉—大井地区是近期3个千亿立方米煤层气储量规模的有利区;Ⅱ类和Ⅲ类目标区将成为中国煤层气中长期发展的重要领域。

关键词 中国 煤层气 富集区 勘探开发 目标区 赋存特点 资源量

专题讲演

Abstract: There are rich coalbed methane (CBM) gas resources in China, featured by substantial coal-bearing basins, various coal-bearing formations and layers, full-scale coal types, and numerous CBM gas reservoirs. The CBM reserves with a burial depth of lessthan 1000 m are up to 14.27 tcm, which becomes the main exploitation target. Under the current situation that China has unveiled some supporting policies, it is high time that we should speed up the CBM development through getting a full knowledge of CBM oc-currence features, accurately selecting the CBM enrichment zones, and drilling with success at the target zones. According to the a-chievements in recent years, 5 major types of CBM enrichment zones are concluded as follows: structural high of some regional coal-bearing areas, acclivity areas with an even distribution of direct sealing rocks, active volcanic areas in the structure of uplift in de-pression, developed areas with low-rank coals and thick coal beds under good sealing conditions in the shallow formations, and a well-developed secondary coal cleats areas formed in fault activities. There is a large potential in the CBM development which is still at initial stage in present China. Through concrete analysis on the indexes of different-rank coals, in combination with the above-mentioned 5 major CBM enrichment zones, we present 6 type-I, 5 type-Ⅱ, and 7 type-Ⅲtarget zones, among which the latter two types will be the important areas for the middle-and long-term CBM development in China; the former one is represented by three large commercial-scale CBM zones with 300 bcm reserves including the Jincheng district in the southern Qinshui Basin, the Jixian-Hancheng district in the southeastern Ordos Basin, and Changji-Dajin district in the southeastern Jungar Basin. Key words:China, coalbed methane gas, enrichment zone, exploration, exploitation, target zone, occurrence, resource reserves

DOI:10.3787/j.issn.1000-0976.2010.11.001

祁猛 我国煤层赋存特点及抽采技术研究

目录

摘要································································2

1． 我国煤层气赋存特点·············································5 2 .中国煤层气的主要聚集类型·········································6

3．结论·····························································7

3.1 采面上部有大量新生裂缝··········································8

3.2 甲烷比空气密度小················································8

3.3 生产特点························································8

4. 煤层气开发的技术途径·············································8

5．地面钻井瓦斯抽采技术························ …… 此处隐藏：7497字，全部文档内容请下载后查看。喜欢就下载吧 ……