二连盆地吉尔嘎朗图凹陷低煤阶煤层气勘探
发布时间：2018-07-25 18:17
【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 m~3/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。
[Abstract]:The low rank coal bed methane resources of Erlian Basin group are abundant but the exploration degree is relatively low. The lack of understanding of the main control factors and the enrichment of coal bed methane restrict the development practice. In this paper, the structure, sedimentation, hydrology, physical property and gas content distribution of the Erlian basin group are dissected with emphasis on Guilanglangtu depression, and the law of coalbed methane accumulation and integration is summarized. Erlian basin group has the characteristics of small faulted lacustrine basin and residual basin. In the main development of coal measures, there are two sets of coal-bearing formations in the lower Jurassic Alatan force group and the lower Cretaceous Bayanhua group, which are mainly braided river delta facies, with many layers of coal seam and superimposed with sand and mudstone, and the inclined angle of coal seam is gentle. In view of the characteristics of "shallow low coal rank, gentle thick coal seam and multi-layer sand coal formation" in the study area, a model of forward structural zone enrichment in slope area is established in accordance with Gilgarang map, and it is suggested that attention should be paid to the optimum selection of buried depth and relatively high permeability in coalbed methane exploration. The "desserts" with high gas content need to avoid faults and seek high yield areas in syncline flanks, anticlines and monocline formations. The gas production of Jitao 4 well, which is selected and deployed, is greater than 2 000 mm3 / d in the 430m 470m coal seam section, which proves that the coal bed methane in the thick coal seam can obtain high industrial airflow in the low gas content in China, and in the lignite area in the thick coal seam. It is helpful to advance the exploration process of low rank coal bed methane resources.
【作者单位】： 中国石油勘探开发研究院廊坊分院;中国石油华北油田公司;中国矿业大学地球科学与测绘工程学院;
【基金】：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) 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
【分类号】：P618.13
本文编号：2144638
[Abstract]:The low rank coal bed methane resources of Erlian Basin group are abundant but the exploration degree is relatively low. The lack of understanding of the main control factors and the enrichment of coal bed methane restrict the development practice. In this paper, the structure, sedimentation, hydrology, physical property and gas content distribution of the Erlian basin group are dissected with emphasis on Guilanglangtu depression, and the law of coalbed methane accumulation and integration is summarized. Erlian basin group has the characteristics of small faulted lacustrine basin and residual basin. In the main development of coal measures, there are two sets of coal-bearing formations in the lower Jurassic Alatan force group and the lower Cretaceous Bayanhua group, which are mainly braided river delta facies, with many layers of coal seam and superimposed with sand and mudstone, and the inclined angle of coal seam is gentle. In view of the characteristics of "shallow low coal rank, gentle thick coal seam and multi-layer sand coal formation" in the study area, a model of forward structural zone enrichment in slope area is established in accordance with Gilgarang map, and it is suggested that attention should be paid to the optimum selection of buried depth and relatively high permeability in coalbed methane exploration. The "desserts" with high gas content need to avoid faults and seek high yield areas in syncline flanks, anticlines and monocline formations. The gas production of Jitao 4 well, which is selected and deployed, is greater than 2 000 mm3 / d in the 430m 470m coal seam section, which proves that the coal bed methane in the thick coal seam can obtain high industrial airflow in the low gas content in China, and in the lignite area in the thick coal seam. It is helpful to advance the exploration process of low rank coal bed methane resources.
【作者单位】： 中国石油勘探开发研究院廊坊分院;中国石油华北油田公司;中国矿业大学地球科学与测绘工程学院;
【基金】：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) 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
【分类号】：P618.13
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