石油学报 ›› 2017, Vol. 38 ›› Issue (5): 485-492.DOI: 10.7623/syxb201705001

• 地质勘探 •    下一篇

二连盆地吉尔嘎朗图凹陷低煤阶煤层气勘探

孙粉锦1, 李五忠1, 孙钦平1, 孙斌1, 田文广1, 陈彦君2, 陈振宏1,3   

  1. 1. 中国石油勘探开发研究院廊坊分院 河北廊坊 065007;
    2. 中国石油华北油田公司 河北任丘 062552;
    3. 中国矿业大学地球科学与测绘工程学院 北京 100083
  • 收稿日期:2016-12-22 修回日期:2017-04-08 出版日期:2017-05-25 发布日期:2017-06-07
  • 通讯作者: 陈振宏,男,1979年5月生,2002年获中国地质大学(武汉)学士学位,2007年获中国科学院广州地球化学研究所博士学位,现为中国石油勘探开发研究院廊坊分院煤层气勘探开发研究所高级工程师、中国矿业大学(北京)博士后,主要从事非常规油气成藏理论基础及勘探地质综合研究工作。Email:chenzhenhong@petrochina.com.cn
  • 作者简介:孙粉锦,男,1967年9月生,1990年获浙江大学学士学位,2003年获浙江大学博士学位,现为中国石油勘探开发研究院廊坊分院煤层气勘探开发研究所所长、教授级高级工程师,主要从事非常规油气地质综合研究及勘探管理工作。Email:sunfj@petrochina.com.cn
  • 基金资助:

    国家重大科技专项"中低煤阶煤层气规模开发区块优选评价"(2016ZX05041)和中国石油天然气股份有限公司重大科技专项"煤层气勘探开发关键技术研究与示范应用"(2013E-2201)资助。

Low-rank coalbed methane exploration in Jiergalangtu sag, Erlian Basin

Sun Fenjin1, Li Wuzhong1, Sun Qinping1, Sun Bin1, Tian Wenguang1, Chen Yanjun2, Chen Zhenhong1,3   

  1. 1. Langfang Branch, PetroChina Research Institute of Petroleum Exploration and Development, Hebei Langfang 065007, China;
    2. PetroChina Huabei Oilfield Company, Hebei Renqiu 062552, China;
    3. College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China
  • Received:2016-12-22 Revised:2017-04-08 Online:2017-05-25 Published:2017-06-07

摘要:

二连盆地群低煤阶煤层气资源丰富但勘探程度相对较低,煤层气富集和主控因素认识不足,制约了开发实践。以吉尔嘎朗图凹陷为重点,对二连盆地群的构造、沉积、水文、物性和含气量分布进行精细解剖,总结了煤层气富集成藏规律。二连盆地群具有断陷小湖盆和残留盆地的特点,分割性强。煤系主要发育中、下侏罗统阿拉坦合力群及下白垩统巴彦花群赛汉塔拉组两套含煤建造,以辫状河三角洲相为主,煤层层数多且与砂泥岩叠置发育,煤层倾角平缓。针对研究区"浅部低煤阶、平缓厚煤层、多层砂煤组"的特点,建立了符合吉尔嘎朗图"斜坡区正向构造带富集模式",提出在煤层气勘探中应注意优选埋深适中、相对高渗、高含气量的"甜点区",并需要规避断层,在向斜两翼、背斜和单斜地层中寻找高产区。优选部署的吉煤4井在埋深430~470 m煤层段获得大于2 000 m3/d的产气量,证实中国低含气量、厚煤层的褐煤区煤层气可以获得高产工业气流,有助于推进低煤阶煤层气资源的勘探进程。

关键词: 煤层气, 吉尔嘎朗图凹陷, 低煤阶, 富集规律, 产量

Abstract:

In Erlian Basin Group, abundant low-rank coalbed methane (CBM) resources exist but with lower exploration degree, where the development practice is restricted by insufficient understandings of CBM enrichment and main control factor. With a focus on Jiergalangtu Depression, based on a fine dissection of the structure, sedimentation, hydrology, physical properties and gas content distribution in Erlian Basin Group, the CBM enrichment and accumulation laws are summarized. Erlian Basin Group is characterized by small faulted lake basins and residual basins with high divisibility. In the coal seam, two sets of coal-bearing formation are developed, i.e., the Mid-Lower Jurassic Alatanheli Group and the Lower Cretaceous Saihantala Formation of Bayanhua Group, dominated by braided river delta facies, where several coal seam layers are developed together with superimposed shale, showing a gentle dip angle. Aiming at the characteristics of "shallow low-rank CBM, thick coal seams with gentle slope and multi-layer sand coal" in the study area, the enrichment model consistent with "the positive structure zone in the slope area" of Jiergalangtu is established, suggesting that the CBM exploration should focus on the "sweet spot area" with moderate buried depth, relatively high permeability and high gas content, avoid the faults and find high-yield zones on the both wings of syncline, anticline and monoclinal strata. In the optimized Well Jimei 4, the gas production greater than 2 000 m3/d is obtained at the buried depth of 430-470 m in the coal seam, proving that high-yield industrial gas flow can be achieved in China's lignite area with low gas content and thick coal seam, conductive to push forward the exploration process of low-rank coal.

Key words: coalbed methane, Jiergalangtu sag, low coal rank, enrichment law, production

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