岩性油气藏 ›› 2015, Vol. 27 ›› Issue (2): 38–45.doi: 10.3969/j.issn.1673-8926.2015.02.007

• 油气地质 • 上一篇    下一篇

鄂尔多斯盆地合阳地区煤层气赋存特征研究

伊 伟1,熊先钺1,王 伟1,刘 玲2   

  1. 1. 中石油煤层气有限责任公司 韩城分公司,陕西 韩城 715400 ;2. 陕西延长油田股份公司,陕西 延安 716000
  • 出版日期:2015-03-03 发布日期:2015-03-03
  • 作者简介:伊伟( 1983- ),男,硕士,工程师,从事煤层气地质、煤层气资源评价及勘探开发综合研究工作。 地址:( 715400 )陕西省韩城市中石油煤层气有限责任公司韩城分公司。 E-mail : yiwei01@petrochina.com.cn 。
  • 基金资助:

    国家重大科技专项 “煤层气井气、水流动特征和变化规律研究”(编号: 2011ZX05038-002 )和国家重点基础研究发展计划( 973 )项目“高丰度煤层气富集机制及提高开采效率基础研究”(编号: 2009CB219600 )联合资助

Study on occurrence features of coalbed methane in Heyang area , Ordos Basin

Y I Wei1, X IONG Xianyue1, WANG Wei1, L IU Ling2   

  1.  1. Hancheng Branch , PetroChina Coalbed Methane Company Ltd. , Hancheng 715400 , Shannxi , China ;2.Yanchang Oilfield Company Ltd. , Yan ’ an 716000 , Shannxi , China
  • Online:2015-03-03 Published:2015-03-03

摘要:

鄂尔多斯盆地合阳地区是我国煤层气勘探的重要区块,在该区进行煤层气赋存特征研究并预测煤层气资源量,对其进一步的开发十分必要。 为此,从地质条件、储层特征(煤层分布、煤层埋藏深度、煤岩特征、煤储层吸附性、煤储层压力、煤储层渗透性及煤层含气性)等方面入手,分析了该区煤层气的赋存特征。结果表明:该区煤层气的保存条件优越;主要含煤地层为二叠系山西组和太原组,含煤层 11 层,可采或局部可采煤层 4 层,煤层累计厚度为 11 m 左右,主力煤层为 5 号煤层,单层厚度超过 3 m;煤质以中—高灰分、低挥发分的贫煤为主,受构造活动破坏的影响较小,煤岩的原生结构较完整,煤储层含气量高且吸附性强。煤层气资源量预测结果表明:该区煤层气主要分布在埋深小于 1 600 m 的范围内,煤层气资源量约为 442.72 亿 m3,其中埋藏深度小于 1 300 m 的煤层气资源量约为 335.01 亿 m3。 由此可见,合阳地区煤层气具有很好的勘探开发前景。

关键词: 浅水三角洲, 沉积特征, 泉四段, 兴城地区, 松辽盆地北部

Abstract:

Heyang area in Ordos Basin is an important block of coalbed methane exploration in our country, so to study the occurrence features of coalbed methane and predict coalbed methane resources is necessary for field development. This paper analyzed the occurrence of coalbed methane in this area in respect of coalbed methane reservoir characteristics including burial depth and thickness of coal layer, features of coal, adsorption and pressure of coal reservoirs, permeability of coal reservoirs, as well as gas content. The results show that the preservation conditions of coalbed methane are advantage. The main coal-bearing strata are Shanxi Formation and Taiyuan Formation of the Permian, containing 11 layers coal, of which 4 layers are recoverable or partially recoverable, the cumulative thickness of coal seam is about 11 m, and the main coal seam is NO.5, of which the thickness is more than 3 m. The coals are dominated by lean coal with high ash and low volatile. Less affected by the destruction of tectonic activity, the original structure of coal is more complete, and the gas content of coal reservoir is high and the adsorption is strong. The prediction result of coalbed methane resources in this area shows that coalbed methane mainly occurs in coal layers shallower than 1 600 m with a cumulative coalbed methane resource volume of 442.72× 108 m3. Among them the coalbed methane resource volume with buried depth shallower than 1 300 m is 335.01×108 m3.

Key words:  shallow water delta, sedimentary characteristics, the fourth member of Quantou Formation, Xingcheng area, northern Songliao Basin


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