Foreword 1 Foreword 2 Preface Chapter 1 Status Quo and Research of CBM Exploration and Development 1.1 CBM Development Status Quo in Some Countries 1.1.1 CBM industry development in the United States 1.1.2 CBM industry development in other countries 1.2 CBM Industry Development Course in China--Theory and Technology Status 1.2.1 Development course 1.2.2 Progress in basic research 1.2.3 Status and progress of CBM exploration and development technology in China 1.3 Key Scientific and Technological Challenges in CBM Exploration and Development in China References Chapter 2 Genesis and Criteria of CBM 2.1 Geochemical Characteristics of CBM and Its Difference from Natural Gas 2.1.1 Sample testing method 2.1.2 Composition and basic characteristics 2.1.3 Composition and distribution of isotope 2.1.4 Difference and specificity of isotope composition 2.2 Control Factors on Carbon Isotope Indicator 2.2.1 Desorption and fractionation of methane carbon isotope 2.2.2 Impact of secondary biogenic gas on methane carbon isotope composition 2.2.3 Impact of microscopic composition of coal rock on methane carbon isotope composition 2.3 Genetic Classification and Geochemical Tracer System 2.3.1 Primary biogenic CBM 2.3.2 Thermally degraded CBM 2.3.3 Thermally cracked CBM 2.3.4 Secondary biogenic CBM 2.3.5 Mixed CBM 2.3.6 Tracer indicator system 2.4 Characteristics and Formation Mechanism of Secondary Biogenic CBM 2.4.1 Characteristics 2.4.2 Organic geochemistry and microbial degradation References Chapter 3 Characterization and Controlling Factors of CBM Reservoirs 3.1 CBM Reservoir Space 3.1.1 Pore system 3.1.2 Fracture system 3.2 Characterization and Mathematical Model of Favorable Coal Reservoirs 3.2.1 Pore system model 3.2.2 Heterogeneous models of CBM reservoir 3.3 Forming Mechanism and Controlling Factors of Favorable Coal Reservoirs 3.3.1 Coal diagenesis 3.3.2 Changes in porosity and permeability during coalification 3.3.3 Structural stress and strain response 3.3.4 Control of basin evolution on coal reservoir physical properties References Chapter 4 Coal Absorption Characteristics and Model under Reservoir Conditions 4.1 Experimental Study on Methane Absorption Characteristics under the Combined Influences of Temperature and Pressure
4.1.1 Isothermal absorption experiment 4.1.2 Temperature-variable and pressure-variable absorption experiment 4.2 Absorption Characteristics of Coal under Formation Conditions 4.2.1 Effect of temperature on coal absorption capacity 4.2.2 Effects of temperature and pressure on coal absorption capacity 4.2.3 Change mechanism of adsorption capacity under reservoir conditions 4.3 Adsorption Model under Reservoir Conditions 4.3.1 Characteristic curve of methane adsorption 4.3.2 High-pressure isothermal adsorption curve and its correction to k value 4.3.3 Absorption model 4.4 Verification and Application of Models 4.4.1 Verified models by isothermal adsorption experiments 4.4.2 Temperature- and pressure-variable experiment results and models 4.4.3 Coal adsorption capacity in Qinshui Basin 4.4.4 Scientific and applied values References Chapter 5 Dynamic Conditions and Accumulation/Diffusion Mechanism of CBM 5.1 Structural Dynamics for CBM Accumulation 5.1.1 Structural evolution laid the foundation for CBM accumulation 5.1.2 Structural differentiation causes complicated dynamic conditions 5.1.3 Transformation from tectonic dynamics on coal seams controls permeable CBM zones 5.1.4 Combined structural dynamic conditions control the basic pattern of CBM accumulation and distribution 5.2 Thermal Dynamic Conditions and Accumulation/Diffusion History of CBM 5.2.1 Thermal history of Carboniferous-Permian coal seams 5.2.2 Middle Yanshanian tectonic thermal event and its thermodynamic source 5.2.3 Numerical simulation of CBM accumulation/diffusion history 5.2.4 Control of thermodynamic conditions on CBM accumulation 5.3 Control and Mechanism of Underground Hydrodynamic System on CBM Accumulation and Diffusion 5.3.1 Hydrogeological unit boundary and its internal structural differences and characteristics of CBM accumulation and diffusion 5.3.2 Underground hydrodynamics zoning and CBM-bearing characteristics 5.3.3 Groundwater geochemical field and CBM preservation conditions 5.3.4 Groundwater head height and gas-bearing properties 5.3.5 Control effect of groundwater dynamic conditions and its manifestation 5.3.6 Relationship between hydrodynamic conditions and CBM enrichment 5.4 Coupling Controls of Dynamic Conditions on CBM Reservoirs 5.4.1 Geological dynamic conditions 5.4.2 Representational dynamic conditions 5.4.3 Energy dynamic balance system and its geological evolution process 5.4.4 CBM accumulation effect and model References Chapter 6 Formation and Distribution of CBM Reservoirs 6.1 M 6.2.1 Theoretical basis of CBM accumulation 6.2.2 Analysis of reservoir forming mechanism of typical CBM reservoirs 6.2.3 Geological models of CBM reservoirs 6.3 Mechanism and Favorable Conditions of CBM Accumulation 6.3.1 Comparison of CBM source conditions 6.3.2 Comparison of CBM reservoir conditions 6.3.3 Features of CBM occurrence comparison 6.3.4 Reservoir forming process 6.3.5 Hydrogeological conditions 6.4 Controlling Factors and Distribution Rules of CBM Enrichment 6.4.1 Structural control and key period 6.4.2 Control of effective overburden and coal seam roof/floor on CBM accumulation 6.4.3 Theory of CBM enrichment in synclines References Chapter 7 Evaluation and Prediction of Technically Recoverable CBM Resources 7.1 Classification System 7.2 Prediction Methods of CBM GTR 7.2.1 Controlling factors on CBM recoverability 7.2.2 Determination methods for important CBM parameters 7.2.3 Predicting methods of CBM GTR 7.3 Potential Analysis of CBM GTR in China 7.3.1 Division of CBM enrichment units 7.3.2 Predicted CBM GTR in China 7.3.3 Distribution of CBM GTR in China References Chapter 8 Seismic Prediction Technology of Favorable CBM Zones 8.1 Primary Geological Attributes of CBM Occurrence and Prediction 8.1.1 Seismic survey to coal seam depth 8.1.2 Coal seam thickness from seismic inversion 8.1.3 Roof lithology from seismic inversion 8.1.4 Seismic waveform classification for predicting CBM content 8.2 Multiwave Seismic Responses and Prediction of Fractures in Coal Seams 8.2.1 Multiwave seismic responses of vertical fractures 8.2.2 Detection of vertical fractures by multiwave seismic data 8.3 AVO Inversion and Prediction of CBM Enrichment Zones 8.3.1 Basic dynamics of AVO theory 8.3.2 The basis of using AVO to detect CBM 8.3.3 AVO responses of controlling geological parameters on CBM enrichment 8.3.4 AVO responses of CBM enrichment zones 8.3.5 Three-parameter AVO method for CBM zones 8.3.6 Three-parameterAVO prediction of CBM enrichment zones References Chapter 9 Comprehensive Evaluation of Geological Conditions for Coalbed Methane Development.. 9.1 Favorable Zones for Coalbed Methane Development in China 9.1.1 Overview of coalbed methane resources in China 9.1.2 Comprehensive evaluation and optimum selection of favorable areas for CBM development 9.2 Evaluation and Optimization of CBM Enrichment Zone (Target Area) in Key Basins 9.2.1 Evaluation methods, parameter and criteria
Chapter 10 Desorption-Seepage Mechanism and Development Schemes 10.1 Elastic Mechanics of Coal Rock in Multiphase Medium 10.1.1 Triaxial mechanical experiment 10.1.2 Experimental principle 10.1.3 Triaxial mechanical characteristics 10.1.4 Volume compressibility and bulk modulus 10.2 Permeability Change of Coal Reservoir While Mining 10.2.1 Permeability experiment 10.2.2 Self-regulating effect model 10.3 Desorption-seepage Mechanism of CBM in Production Process 10.3.1 Characteristics of CBM production 10.3.2 Kinetic characteristics and desorption behavior ofCBM desorption 10.3.3 CBM seepage mechanism 10.4 Optimal CBM Reservoir Development Schemes 10.4.1 CBM production performance 10.4.2 Comparison of development schemes References Chapter 11 Stimulation Mechanism and Application 11.1 Hydraulic Fracturing Stimulation 11.1.1 Experimental study 11.1.2 Characteristics of induced fractures 11.1.3 Fracture distribution model 11.1.4 Hydraulic fracturing measures and technology 11.2 Stimulation Mechanism of Multi-branch Horizontal Wells 11.2.1 Mathematical and numerical models 11.2.2 Stimulation mechanism of multi-branch horizontal CBM wells 11.2.3 Application conditions and economic analysis 11.3 Application Cases 11.3.1 Fracturing operation and effect 11.3.2 Application of multi-branch horizontal wells and result analysis References Conclusions
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