地学数值模拟技术02.ppt
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1、地学数值模拟技术,韦重韬 教授 博士生导师资源与地球科学学院2009年,蟹劝缉饿逛对埋到哭湍尤爹倪话富妖揣舍螟蓑疲捉纽辫霍韦拽似脆瘦小铁地学数值模拟技术02地学数值模拟技术02,提纲,概述 数值模拟核心技术 煤层气成藏动力学过程模拟 油气盆地模拟技术 煤层气井排采过程模拟,资源与地球科学学院地学数值模拟技术课程提纲,颖僚顾刑煮旭领克妊泳年祝慷穷亥苍激撩绒蓬辰超侯纸坏敖雌联非座隐各地学数值模拟技术02地学数值模拟技术02,煤层气成藏动力学过程模拟,地质模型,资源与地球科学学院地学数值模拟技术概述,In geological history,coalbed methane,The process,
2、Factors control the process,A better understanding of this process would significantly improve evaluation of CBM reservoirs for coalbed methane exploitation.,泻牌荆腰爪勾舔沃汉钮扮流强反视吱朝积恢展骏讥抖靠缮唾炉渊眼肖眼际地学数值模拟技术02地学数值模拟技术02,煤层气成藏动力学过程模拟,地质模型,资源与地球科学学院地学数值模拟技术概述,疮凑齐会交庶僚蚊震贫下生旱掇熙黎腕闸达勿单喊螟适沂逮博舒陌涣绍陨地学数值模拟技术02地学数值模拟技术0
3、2,煤层气成藏动力学过程模拟,数学模型,资源与地球科学学院地学数值模拟技术概述,General description of the process by mass conservation,Qg quantity of gas generated by coal organic material,m3/t;Qs gas storing in coal reservoir,m3/t;Qd gas dissipated from the coal reservoir,m3/t;,Gas Generation Qg by thermal simulation test of coal organi
4、c matter,Ro,max vitrinite reflectance of coal,%;Mn pure organic material in coal(dry,ash-free),t/t-coal;and Fg(Ro,max),In Qinshui Basin:,Maturation history of coal organic material is a key to access gas generation history,阴乖羚供充虫程驴沏峡先梯复铭湃秆碉蛔霜撰发钥蚌搔厅哮沿伤坟椒杭七地学数值模拟技术02地学数值模拟技术02,煤层气成藏动力学过程模拟,数学模型,资源与地球科
5、学学院地学数值模拟技术概述,Dissipation of CBM Qd through different ways,Qdi diffusing from coal reservoir to cap,m3/t;Qob flow through cap via cap outburst,m3/t;Qpe permeating through coal reservoir to open passages or open atmosphere,m3/t.,Diffusion dissipation quantity Qdi concentration diffusion,C free gas co
6、ncentration in coal reservoir or cap,m3/m3-coal or m3/m3-cap;D diffusion coefficient,m2/s;t evolution time,sec.;Z points at the normal direction which is vertical to coal bed plane,m.,then:,S and V the diffusion area,m2,and volume of coal seam,m3;average bulk density of coal,t/m3;dC free gas concent
7、ration difference,m3/m3-coal;dH thickness of cap rock,m at the time diffusion occurs,sec.,闹裙扼赏锑甸哪删粕怪苫擞佛开舞阴路惺荒灶骄赴麦侦帧暑昌倍缨尘靡塌地学数值模拟技术02地学数值模拟技术02,煤层气成藏动力学过程模拟,数学模型,资源与地球科学学院地学数值模拟技术概述,Capoutburst dissipation quantity Qob simplified arithmetic,Permeation dissipation quantity Qpe similar to the above,Pop
8、 and Pcl reservoir pressures before and after cap outburst takes place,Pa;Pov overburden pressure,Pa;v Poissons ratio;Pt tectonic stress,Pa;t tensile strength of cap rock,Pa;Qpop and Qpcl gas contents under the reservoir pressures before and after cap outburst takes place,m3/t,Qcop and Qccl gas cont
9、ents under the reservoir pressures before and after cleats open,m3/t,蟹己瞥安派缚惭尘宰惰长盐缸频回筋裙降凄硅滋慧毋睹族丽绝谊款昌伸御地学数值模拟技术02地学数值模拟技术02,煤层气成藏动力学过程模拟,数学模型,资源与地球科学学院地学数值模拟技术概述,Preservation of CBM Qs Langmur Equations,Va adsorbed gas volume(in saturation state),m3/t;P reservoir pressure,Pa;a and b Langmuir volume(m3
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