基于AHP和模糊数学评价地质构造对煤层气产能的影响

发布时间：2018-02-26 16:39

本文关键词： 煤层气构造复杂程度层次分析法模糊数学产能评价　出处：《煤炭学报》2017年09期 　论文类型：期刊论文

【摘要】：为了发现地质构造对煤层气井产气效果的影响规律,以沁水盆地长治区块为研究对象,引入煤层厚度分异系数表征构造复杂程度,应用层次分析法对区块构造复杂程度系数进行了评价,依此进行了构造单元划分,结合各构造单元煤层气赋存的地质条件、储层物性和含气性等因素对煤层气井产能影响的模糊数学分析结果,建立了地质构造对煤层气井产能的AHP-模糊数学评价方法。研究表明按照地质构造复杂程度可将长治区块划分为构造简单区、构造较简单区和构造中等发育区3类,根据煤层气井产能的AHP-模糊数学计算结果,分值由高到低依次为:构造较简单区、构造简单区、构造中等发育区。即对于长治区块而言,构造较简单区内煤层气井的产能最大,其次为构造简单区,而构造中等发育区内煤层气井的产能最小。区内不同构造单元的煤层气井产气、产水效果,以及排采曲线特征表明,本次评价结果与实际相吻合,在一定程度上反映了构建的地质构造对煤层气井产能的AHP-模糊数学评价方法的合理性,可为区块煤层气井位优选和产能提高提供借鉴。
[Abstract]:In order to find out the influence of geological structure on the gas production effect of coalbed methane wells, taking Changzhi block of Qinshui Basin as the research object, the differential coefficient of coal seam thickness is introduced to characterize the complexity of the structure. The structural complexity coefficient of blocks is evaluated by AHP, and the structural units are divided according to this, and combined with the geological conditions of coalbed methane occurrence in each tectonic unit, The results of fuzzy mathematical analysis of the effects of reservoir physical properties and gas bearing properties on the productivity of coalbed methane wells, An AHP- fuzzy mathematical method for evaluating the productivity of coalbed gas wells by geological structure is established. The study shows that Changzhi block can be divided into three types according to the complexity of geological structure: simple structural area, relatively simple structure area and moderately developed structural area. According to the results of AHP- fuzzy mathematics calculation of coalbed gas well productivity, the scores from high to low are as follows: simple structure area, simple structure area, middle developed structure area, that is, for Changzhi block, the coalbed gas well productivity is the largest in the relatively simple structure area. Secondly, the simple structure area, while the coalbed gas well productivity is the least in the middle structural development area. The characteristics of gas production, water production and drainage curve of the coalbed gas wells in different structural units in this area show that the evaluation results are consistent with the actual situation. To a certain extent, it reflects the rationality of the AHP- fuzzy mathematics evaluation method for the productivity of coalbed methane wells, which can be used as a reference for the location optimization and productivity improvement of CBM wells in blocks.
【作者单位】：河南理工大学能源学院;中原经济区煤层气(页岩气)协同创新中心;中国石油华北油田分公司勘探开发研究院;
【基金】：国家自然科学基金资助项目(41372162) 河南省高校科技创新团队支持计划资助项目(14IRTSTHN002)
【分类号】：P618.13;TE37

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