渭北煤层气示范区煤储层成藏演化控制机理研究
发布时间：2018-10-15 20:25
【摘要】：渭北煤层气区的煤储层含气量、含气饱和度、渗透率等基础参数表现出强烈的非均质性特征。本论文针对这一问题,开展煤层气成藏演化模拟。剖析了储层物性参数非均质分布特征及其地质控制机理,取得的主要成果和认识如下:(1)研究了区域煤储层演化规律。开展数值模拟(构造沉降史、热史、生烃史模拟)揭示了研究区含煤层系剖面、平面构造演化特征。剖析构造热事件主控的区域热演化历程,以及两期生-排烃过程为主体的烃类演化史。(2)剖析了研究区煤储层能量场(地下水动力场、应力场、温度场)分布特征。通过地下水同位素分析、水化学分析和Aquachem模拟开展渭北煤层气区地下水动力场的特征研究,分析五个水力构造单元内地下水动力场特征、三条区域逆断层对气体运移、聚集的影响。运用地球物理资料开展模拟,揭示了区域地应力分布规律。研究了现今温度场分布特征,以及不同构造单元的差异性。(3)揭示了区域煤层气成藏演化规律。通过实验室物理模拟与数值模拟相结合,阐明了含煤层系在六个阶段演化过程中气体富集、逸散、保存特征,剖析了四个关键构造事件对现今含气性及储层物性的差异分布格局的控制。其中,第一和第二个关键构造事件分别控制初次生烃和二次生烃过程,而第三和第四个关键构造事件则控制区域含气性的非均质分布特征。(4)建立了煤层气富集的控制模式。依据同位素测试结果结合地下水流动特征,剖析了区域含气性差异分布的水文-地质控制机理,提出“热成因-运移-断层封堵型”,“水力、压力和岩性封闭型”以及“水力冲刷逸散型”等三种气体聚集模式。(5)建立了煤储层渗透性预测模型。基于深侧向电阻率测井和微球聚焦测井开展渗透性预测,查明了区域煤储渗透性的差异发育特征,将预测结果与区域地应力分布特征和构造演化特征相结合,共同揭示煤储层渗透性差异分布的地质控制机理。(6)建立了煤层气综合评价体系,提出了有利开发区预测方法。
[Abstract]:The basic parameters such as gas content, gas saturation and permeability of coal reservoir in Weibei coalbed methane area show strong heterogeneity. In order to solve this problem, the simulation of coalbed methane reservoir formation and evolution is carried out in this paper. The characteristics of heterogeneous distribution of reservoir physical parameters and its geological control mechanism are analyzed. The main achievements and understandings are as follows: (1) the evolution law of regional coal reservoir is studied. The numerical simulation (tectonic subsidence history, thermal history, hydrocarbon generation history simulation) revealed the characteristics of coal seam system profile and plane tectonic evolution in the study area. The regional thermal evolution process controlled by tectonic thermal events and the evolution history of hydrocarbon in two periods are analyzed. (2) the distribution characteristics of energy field (ground water dynamic field, stress field, temperature field) of coal reservoir in the study area are analyzed. The characteristics of groundwater dynamic field in Weibei coalbed methane area were studied by means of isotope analysis, hydrochemical analysis and Aquachem simulation. The characteristics of groundwater dynamic field in five hydraulic structural units were analyzed, and three regional reverse faults were applied to gas migration. The effect of aggregation. The geophysical data are used to simulate the regional stress distribution. The distribution characteristics of the present temperature field and the differences of different tectonic units are studied. (3) the evolution of coalbed methane reservoirs in the region is revealed. Through the combination of laboratory physical simulation and numerical simulation, the characteristics of gas enrichment, dispersion and preservation in the evolution process of coal bed system in six stages are expounded. The control of four key tectonic events on the differential distribution pattern of present gas bearing property and reservoir physical property is analyzed. The first and second key tectonic events control the primary and secondary hydrocarbon generation processes, respectively, while the third and the fourth key tectonic events control the heterogeneous distribution of the gas content in the region. (4) the control model of coalbed methane enrichment is established. Based on the isotopic test results and the characteristics of groundwater flow, the hydro-geological control mechanism of regional gas-bearing difference distribution is analyzed. Three kinds of gas accumulation models are pressure and lithologic sealing type and hydraulic scouring and dissipating type. (5) the permeability prediction model of coal reservoir is established. Based on deep lateral resistivity logging and microsphere focusing logging, permeability prediction is carried out to find out the differential development characteristics of regional coal reservoir permeability. The prediction results are combined with regional stress distribution and tectonic evolution characteristics. The geological control mechanism of the differential distribution of permeability of coal reservoir is revealed together. (6) the comprehensive evaluation system of coalbed methane is established and the prediction method of favorable development zone is put forward.
【学位授予单位】：中国地质大学(北京)
【学位级别】：博士
【学位授予年份】：2016
【分类号】：P618.13
本文编号：2273740
[Abstract]:The basic parameters such as gas content, gas saturation and permeability of coal reservoir in Weibei coalbed methane area show strong heterogeneity. In order to solve this problem, the simulation of coalbed methane reservoir formation and evolution is carried out in this paper. The characteristics of heterogeneous distribution of reservoir physical parameters and its geological control mechanism are analyzed. The main achievements and understandings are as follows: (1) the evolution law of regional coal reservoir is studied. The numerical simulation (tectonic subsidence history, thermal history, hydrocarbon generation history simulation) revealed the characteristics of coal seam system profile and plane tectonic evolution in the study area. The regional thermal evolution process controlled by tectonic thermal events and the evolution history of hydrocarbon in two periods are analyzed. (2) the distribution characteristics of energy field (ground water dynamic field, stress field, temperature field) of coal reservoir in the study area are analyzed. The characteristics of groundwater dynamic field in Weibei coalbed methane area were studied by means of isotope analysis, hydrochemical analysis and Aquachem simulation. The characteristics of groundwater dynamic field in five hydraulic structural units were analyzed, and three regional reverse faults were applied to gas migration. The effect of aggregation. The geophysical data are used to simulate the regional stress distribution. The distribution characteristics of the present temperature field and the differences of different tectonic units are studied. (3) the evolution of coalbed methane reservoirs in the region is revealed. Through the combination of laboratory physical simulation and numerical simulation, the characteristics of gas enrichment, dispersion and preservation in the evolution process of coal bed system in six stages are expounded. The control of four key tectonic events on the differential distribution pattern of present gas bearing property and reservoir physical property is analyzed. The first and second key tectonic events control the primary and secondary hydrocarbon generation processes, respectively, while the third and the fourth key tectonic events control the heterogeneous distribution of the gas content in the region. (4) the control model of coalbed methane enrichment is established. Based on the isotopic test results and the characteristics of groundwater flow, the hydro-geological control mechanism of regional gas-bearing difference distribution is analyzed. Three kinds of gas accumulation models are pressure and lithologic sealing type and hydraulic scouring and dissipating type. (5) the permeability prediction model of coal reservoir is established. Based on deep lateral resistivity logging and microsphere focusing logging, permeability prediction is carried out to find out the differential development characteristics of regional coal reservoir permeability. The prediction results are combined with regional stress distribution and tectonic evolution characteristics. The geological control mechanism of the differential distribution of permeability of coal reservoir is revealed together. (6) the comprehensive evaluation system of coalbed methane is established and the prediction method of favorable development zone is put forward.
【学位授予单位】：中国地质大学(北京)
【学位级别】：博士
【学位授予年份】：2016
【分类号】：P618.13
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