【摘要】：二連盆地群低煤階煤層氣資源豐富但勘探程度相對較低,煤層氣富集和主控因素認(rèn)識不足,制約了開發(fā)實踐。以吉爾嘎朗圖凹陷為重點,對二連盆地群的構(gòu)造、沉積、水文、物性和含氣量分布進(jìn)行精細(xì)解剖,總結(jié)了煤層氣富集成藏規(guī)律。二連盆地群具有斷陷小湖盆和殘留盆地的特點,分割性強(qiáng)。煤系主要發(fā)育中、下侏羅統(tǒng)阿拉坦合力群及下白堊統(tǒng)巴彥花群賽漢塔拉組兩套含煤建造,以辮狀河三角洲相為主,煤層層數(shù)多且與砂泥巖疊置發(fā)育,煤層傾角平緩。針對研究區(qū)"淺部低煤階、平緩厚煤層、多層砂煤組"的特點,建立了符合吉爾嘎朗圖"斜坡區(qū)正向構(gòu)造帶富集模式",提出在煤層氣勘探中應(yīng)注意優(yōu)選埋深適中、相對高滲、高含氣量的"甜點區(qū)",并需要規(guī)避斷層,在向斜兩翼、背斜和單斜地層中尋找高產(chǎn)區(qū)。優(yōu)選部署的吉煤4井在埋深430~470 m煤層段獲得大于2 000 m~3/d的產(chǎn)氣量,證實中國低含氣量、厚煤層的褐煤區(qū)煤層氣可以獲得高產(chǎn)工業(yè)氣流,有助于推進(jìn)低煤階煤層氣資源的勘探進(jìn)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.
【作者單位】： 中國石油勘探開發(fā)研究院廊坊分院;中國石油華北油田公司;中國礦業(yè)大學(xué)地球科學(xué)與測繪工程學(xué)院;
【基金】：國家重大科技專項“中低煤階煤層氣規(guī)模開發(fā)區(qū)塊優(yōu)選評價”(2016ZX05041) 中國石油天然氣股份有限公司重大科技專項“煤層氣勘探開發(fā)關(guān)鍵技術(shù)研究與示范應(yīng)用”(2013E-2201)資助
【分類號】：P618.13

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