山西古交矿区煤储层含气量及产能控制因素分析

发布时间：2018-06-03 05:42

本文选题：煤层气 + 古交矿区　；参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：古交矿区位于沁水盆地西北部,距离山西省太原市30多公里,其煤层气勘探开发工作开展较晚,主要的开发煤层为山西组2号煤和太原组8、9号煤。本文以古交矿区马兰矿、屯兰矿和东曲矿煤层气地质与开发资料为基础,建立了适用于研究区的煤储层含气量测井预测模型,分析了煤层含气量分布特征;阐明了该区煤储层含气量及煤层气富集控制机理;基于煤层气井产能分析提出了针对性的煤层气开发建议。研究对于指导该区煤层气的开发具有理论和实际意义。基于研究区煤储层补偿密度、自然伽马、视电阻率、自然电位和井径测井解释值与实测含气量之间的关系,建立了含气量多参数线性回归模型。利用含气量实测值对模型进行了验证,结果显示:含气量计算值的绝对误差为0.02-3.82 cm3/g,平均1.39 cm3/g;相对误差0.24-37.85%,平均17.68%。研究结果表明,所建立的模型在研究区含气量预测应用方面具有一定的可行性。分析了研究区煤储层含气量特征,在平面上确定了马兰矿西南部为煤层风氧化区,含气量和甲烷浓度相对较低,李家社断层北部为3套煤层的高含气量区域;在纵向上煤储层含气量和甲烷浓度由高到低依次为8号、9号、2号煤层;基于灰色关联度分析法,进一步对煤储层含气量的影响因素进行了分析,按影响程度由强到弱排序依次为:构造特征、煤层埋深、顶板性质和煤的岩石学性质。对研究区的煤层气井排采曲线进行了系统分析,按气井产气曲线特征将其划分为下降型、平稳型、多箱型、上升型、多峰型5种类型。从地质条件、压裂效果和开发方式等角度揭示了造成气井产能较大差异的原因。进一步提出了针对古交矿区的煤层气井开发建议:1)在西部向斜控制区,井网布置优先选择倒梯形井网,对处在构造低部位的气井,适当增加其排采强度;2)东部断层控制区的李家社-头南峁地堑区,井网布置优先选择梅花形井网,同时根据含煤层系地质特征选择针对性的直接或间接压裂方式进行开发;3)研究区煤层气井在开发方式的选择上应尽量选择单煤层开发,如要选择多煤层合采,需要提前制定与储层物性相匹配的排采制度。
[Abstract]:Gujiao mining area is located in the northwest of Qinshui Basin, more than 30 kilometers from Taiyuan City, Shanxi Province. The exploration and development of coal bed methane in Gujiao mining area is late. The main coal seam is Shanxi No. 2 coal and Taiyuan formation No. 8,9 coal. Based on the geological and development data of coalbed methane in Ma Lan, Tunlan and Dongqu mines in Gujiao mining area, a prediction model of gas content in coal reservoir is established, and the distribution characteristics of gas content in coal seam are analyzed. This paper expounds the gas content of coal reservoir and the control mechanism of coalbed methane enrichment in this area, and puts forward some suggestions for the development of coalbed methane based on the productivity analysis of coalbed gas wells. The study is of theoretical and practical significance for guiding the development of coalbed methane in this area. Based on the relationship between the compensation density, gamma ray, apparent resistivity, natural potential and well diameter log interpretation value and the measured gas content in the study area, a multi-parameter linear regression model of gas content is established. The results show that the absolute error of the calculated gas content is 0.02-3.82 cm ~ 3 / g, with an average of 1.39 cm ~ 3 / g, and the relative error is 0.24-37.85, with an average of 17.68%. The results show that the model is feasible in predicting the gas content in the study area. The characteristics of gas content in coal reservoir in the study area are analyzed. The southwest of Ma Lan mine is determined as the wind oxidation zone of coal seam on the plane, and the gas content and methane concentration are relatively low, and the northern part of Lijiaxe fault is the high gas content area of three sets of coal seams. The gas content and methane concentration of coal reservoir are in turn 8, 9 and 2 from high to low. Based on grey correlation analysis, the influencing factors of gas content in coal reservoir are further analyzed. The order of influence degree from strong to weak is: structural characteristics, coal seam burial depth, roof properties and petrological properties of coal. The production curve of coalbed gas wells in the study area is systematically analyzed. According to the characteristics of gas production curves, it can be divided into five types: descending type, stable type, multi-box type, rising type and multi-peak type. From geological conditions, fracturing effects and development methods, the reasons for the great difference of gas well productivity are revealed. Furthermore, it is put forward that in the western syncline control area, the well pattern is arranged in preference to the inverted trapezoid well pattern, and for the gas wells in the low structural position, the development suggestion of coalbed methane wells in Gujiao mining area is proposed. Properly increase its drainage intensity (2) in the eastern fault control area of Lijiashe Tumao graben area, well pattern layout is preferred to select the Meihua well pattern. At the same time, according to the geological characteristics of coal seam system, we should select direct or indirect fracturing methods to develop coal bed gas wells in the research area. In the development mode of coalbed gas wells, we should choose as far as possible the development mode of single coal seam, such as multiple coal seam combined production. It is necessary to establish a production discharge system matching reservoir physical properties in advance.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE37

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