西山古交区块煤储层孔渗特性与有利建产区预测

发布时间：2018-01-21 02:06

本文关键词： 古交矿区应力场模拟高温覆压孔渗模拟孔裂隙特征孔渗地质单元　出处：《中国矿业大学》2015年硕士论文　论文类型：学位论文

【摘要】：西山古交区块煤层气商业开发潜力可观,但目前对煤储层的非均质性认识难以支撑全区煤层气规模性开发的需求。为此,本次研究在掌握地质构造背景的基础上,采用高温覆压孔渗模拟手段,结合地层温度和地层压力模拟结果,建立了符合研究区地质条件的煤层渗透性预测模型,以此预测区块内煤层孔渗性的三维空间分布特征,再结合常温常压条件下的孔渗分布特征,将整个区块划分成六个孔渗地质单元,探讨了影响煤储层孔渗性的地质因素和机理,提出了不同单元煤层气开采方式的建议。得出:屯兰矿区渗透性较高,储层连通性较好,非均质性较差,是有利的的生产区块,可优先开采;东曲矿区煤层孔裂隙发育程度较高,渗透性也较好,但由于煤体结构破碎,产生的煤粒和煤粉多充填到孔裂隙空间中阻碍了煤层气的渗流,因此在生产过程中要着重考虑采取措施消除煤粉;马兰、镇城底和西曲矿的渗透性处于中等水平,储层的孔裂隙发育程度较低,因此生产中可注重压裂增渗技术的应用。未开发区块以及西铭和杜儿坪矿区的渗透性相对较差,在生产中应着重考虑压裂增渗作用。
[Abstract]:The commercial development potential of coalbed methane in Xishan Gujiao block is considerable, but the recognition of heterogeneity of coal reservoir is difficult to support the demand for large-scale development of coalbed methane in the whole area. On the basis of mastering the geological structure background, adopting the method of high temperature overpressure pore permeability simulation and combining the results of formation temperature and formation pressure simulation, a prediction model of coal seam permeability is established, which accords with the geological conditions of the study area. In order to predict the three-dimensional spatial distribution characteristics of the porosity and permeability of coal seam in the block, combined with the distribution characteristics of pore and permeability under normal temperature and pressure, the whole block is divided into six pore and permeability geological units. This paper discusses the geological factors and mechanism affecting the porosity and permeability of coal reservoir, and puts forward some suggestions for different units of coalbed methane production methods. It is concluded that the permeability of Tunlan mining area is higher, the reservoir connectivity is better, and the heterogeneity is poor. Is a favorable production block and can be exploited preferentially; In Dongqu mining area, the development degree of coal seam hole and fracture is relatively high, and the permeability is also good. However, due to the coal body structure broken, the coal particles and coal powder are filled into the pore crack space, which hinders the seepage of coal bed methane. Therefore, measures should be taken to eliminate pulverized coal in the process of production. The permeability of Ma Lan, Zhencheng bottom and Xiqu mine is in medium level, and the porosity and fissure development degree of reservoir is low. Therefore, the application of fracturing and permeability enhancement technology can be emphasized in production. The permeability of undeveloped blocks and Ximing and Duerping mining areas is relatively poor, so the role of fracturing and permeability enhancement should be taken into account in production.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE37

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