【摘要】：本文以鶴崗、雞西礦區(qū)各礦井主采煤層為研究對象,采用地質(zhì)分析、井下描述、實驗測試分析以及模糊數(shù)學(xué)分析相結(jié)合的手段,分析了鶴崗、雞西礦區(qū)不同煤儲層特征參數(shù)的變化規(guī)律及其對煤層氣藏的指示作用,定義并劃分了煤層氣藏類型,建立了研究區(qū)煤層氣藏類型判識指標體系和標準,評判了研究區(qū)氣藏類型并為不同類型氣藏開發(fā)技術(shù)模式的選擇提出了建議。分析研究表明:隨著煤體破壞程度的加大,煤體堅固性系數(shù)降低,自由基濃度增加,同時隨著煤中的外生孔數(shù)量增加,不僅增加了煤孔隙的總孔容、大孔孔容及中孔孔容,還使微孔孔容及微孔比表面積大幅度增加,使得構(gòu)造煤煤體破壞程度越高,吸附能力越強,儲氣能力越強,這些參數(shù)反映了不同煤層氣藏的儲集特征差異性;研究區(qū)構(gòu)造硬煤所表現(xiàn)出來的高滲透率、高臨儲比、高含氣飽和度、高儲層壓力梯度等儲層特征參數(shù)指示了壓降容易且可采用原位煤層氣開發(fā)方式的煤層氣藏,而構(gòu)造軟煤原位條件下的低滲透率、低臨儲比、低含氣飽和度、低儲層壓力梯度等參數(shù)是原位煤層氣開采的不利因素,但卸壓后的高滲透率、高解吸能力、高擴散能力則可使煤儲層壓降大范圍傳遞,煤層氣可得到大規(guī)模解吸和順利產(chǎn)出,這種儲層類型的特征參數(shù)指示了可采用卸壓的非原位煤層氣開發(fā)方式的煤層氣藏。研究區(qū)儲層特征分析表明,由于煤體結(jié)構(gòu)的不同而導(dǎo)致了煤儲層開發(fā)方式的分異性。因此,基于煤體結(jié)構(gòu)控制的儲層分異,將煤層氣藏劃分為儲層壓力可傳導(dǎo)型氣藏、壓力主導(dǎo)型氣藏、應(yīng)力主導(dǎo)型氣藏以及應(yīng)力封閉型氣藏四種氣藏,并選取煤體堅固性系數(shù)、自由基濃度、蘭氏體積、臨儲比、解吸效率、含氣飽和度、滲透率、蘭氏壓力、擴散系數(shù)、儲層壓力梯度等指標參數(shù)建立煤層氣藏二級判識指標體系和標準,評價了研究區(qū)采樣煤層的氣藏特征,并針對不同煤層氣藏類型提出了開發(fā)技術(shù)模式建議,即壓力主導(dǎo)型氣藏可采用疏水降壓的開采模式,應(yīng)力主導(dǎo)型氣藏可采用應(yīng)力釋放增透卸壓的開采模式。
[Abstract]:In this paper, the main coal seams in Hegang and Jixi mining areas are taken as the research objects. By means of combining geological analysis, underground description, experimental test analysis and fuzzy mathematics analysis, the variation regularity of the characteristic parameters of different coal reservoirs in Hegang and Jixi mining areas and their indicative effects on coalbed methane reservoirs are analyzed, and the types of coalbed methane reservoirs are defined and classified. The results show that with the increase of coal destruction degree, the coal body firmness coefficient decreases and the free radical concentration increases. At the same time, with the increase of outer pore in coal The increase of quantity not only increases the total pore volume, macropore volume and mesoporous pore volume of coal pores, but also greatly increases the pore volume and specific surface area of micropore. The higher the destructive degree of structural coal, the stronger the adsorption capacity, and the stronger the gas storage capacity, these parameters reflect the difference of reservoir characteristics of different coal-bed methane reservoirs. Reservoir characteristic parameters such as high permeability, high impending reserve ratio, high gas saturation and high reservoir pressure gradient indicate coalbed methane reservoirs with easy pressure drop and in-situ coalbed methane development mode, while in-situ coalbed methane reservoirs with low permeability, low impending reserve ratio, low gas saturation and low reservoir pressure gradient are in-situ coals. However, high permeability, desorption capacity and diffusion capacity after pressure relief can make the pressure drop of coal reservoir transmit in a wide range, and coalbed methane can be desorbed and produced smoothly on a large scale. The characteristic parameters of this reservoir type indicate the coalbed methane reservoir which can be developed by pressure relief in non-in-situ. Characteristic analysis shows that the development mode of coal reservoir is different because of the different coal body structure. Therefore, based on the reservoir differentiation controlled by coal body structure, CBM reservoir is divided into four types: reservoir pressure conductive gas reservoir, pressure-dominated gas reservoir, stress-dominated gas reservoir and stress-sealed gas reservoir, and coal body is selected to be strong. Parameters such as property coefficient, free radical concentration, Langmuir volume, imminent reserve ratio, desorption efficiency, gas saturation, permeability, Langmuir pressure, diffusion coefficient, reservoir pressure gradient etc. are used to establish the secondary identification index system and criteria for coalbed methane reservoirs. The characteristics of coal-bed methane reservoirs sampled in the study area are evaluated, and development techniques are proposed for different types of Coalbed methane reservoirs. The model suggests that hydrophobic depressurization can be adopted in pressure-dominated gas reservoirs and stress-dominated gas reservoirs can adopt stress release, permeability enhancement and pressure relief.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE37

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