A Research on Coal Reservoir Geological Modeling and its Application in Exploration and Development of the Coalbed Methane (CBM)

2013 ◽  
Vol 734-737 ◽  
pp. 17-20
Author(s):  
Hong Wei Zhang
Keyword(s):  
Coalbed Methane ◽  
Reservoir Modeling ◽  
Structure Modeling ◽  
Geological Modeling ◽  
Geological Exploration ◽  
Facies Modeling ◽  
Reservoir Properties ◽  
The Face ◽  
Coal Reservoir ◽  
Exploration And Development

In coalfield geological exploration, in the face of complexity and levity of geological bodies, the reservoir geological modeling technique a new and high technique grown up in recent years, plays an important role on exploration and development of CBM. Reservoir modeling would be finished through 3 stages: reservoir structure modeling, precipitation facies modeling, reservoir properties modeling. A 3D geological model may carry out the meticulous description of coal reservoir , and quantitatively characterize the inhomogeneities of reservoir. In addition, geological modeling is of great importance to engineering design and construction as well as information management, analysis and decision making.

Three Dimensional Fine Structure Modeling of Haqian1 Wellblock, in Northern Dzungaria Basin, China

2013 ◽  
Vol 734-737 ◽  
pp. 488-492
Author(s):  
Chen Qiang Dong ◽  
Fang Ding ◽  
Wei Wei Ren
Keyword(s):  
Three Dimensional ◽  
Fault Model ◽  
Structure Modeling ◽  
Good Prospect ◽  
Geological Model ◽  
Structure Model ◽  
Geological Modeling ◽  
Geological Exploration ◽  
3D Geological Modeling ◽  
Set Up

Haqian wellblock has a very good prospect in Dzungaria Basin, as it developed many faults and some formations are truncated, the development situation of it is very complicated, in this paper, we applied 3D geological modeling method which is one of the most important technology methods in describing the underground development situation, to illustrate the intricate structure. This geological model involved computer modeling and visualization of geological fault in 3D, the type of data of geological faults based on geological exploration is analyzed, after the fault model and horizon model are built, a whole structure model is finally set up.

Coal Reservoir Property Differences Analysis of Different Macrolithotype in Liulin Mining Area

2014 ◽  
Vol 915-916 ◽  
pp. 1108-1112
Author(s):  
Ling Li ◽  
Da Zhen Tang ◽  
Hao Xu ◽  
Yao Chen ◽  
Ting Xu Yu
Keyword(s):  
Coalbed Methane ◽  
Mining Area ◽  
Reservoir Properties ◽  
Methane Seepage ◽  
Reservoir Property ◽  
Adsorption Capacities ◽  
Three Stages ◽  
Coal Reservoir ◽  
Adsorption Desorption ◽  
And Diffusion

This paper focused on the influences of different coal macrolithotypes on the coal reservoir properties, using a variety of testing methods studied the connection between macro-lithotype of coal and properties. When coal lithotypes changing from dull coal, bright coal, semibright coal to semidull coal, the adsorption pores change from enclosed types to open, adsorption capacities improved in turn, which is favorable to adsorption, desorption and diffusion of coalbed methane. Seepage pores of bright coal are the most developed, semidull coal and semibright coal less, dull coal the least. The permeability of coal has a positive correlation between microfissure density and large pore content. Different macrolithotype of the same coal seam changes with the permeability could be divided into three stages, including fractures decrease rapidly stage, fractures decrease slowly stage and fractures tend to be closed stage.

Integrated Study of 3D Gas Reservoir Geological Modeling of North in Su11 Block

2014 ◽  
Vol 522-524 ◽  
pp. 1341-1345
Author(s):  
Zhi Guo Jin ◽  
Dan Zhang ◽  
Da Zhen Tang
Keyword(s):  
Structural Model ◽  
Gas Production ◽  
Reservoir Modeling ◽  
Facies Modeling ◽  
Reservoir Properties ◽  
Gas Reservoir ◽  
Gas Well ◽  
Reservoir Heterogeneity ◽  
Geological Facies ◽  
Better Than

As the reservoir heterogeneity causes that the production accumulation of gas well has the large differences among gas wells and the gas production of a few wells decline fast, the 3D gas reservoir modeling is used for the reservoir heterogeneity characterization. By the 3D gas reservoir modeling of integrating the geological facies information into the facies modeling, a reasonable model of He8 and Shan1 formation was built, which includes the structural model, the facies model, and the reservoir properties model. Based on the model analysis, the gas sandstone belt distribution lies along the direction of from north to south. The gas sandstone in the 4, 5, 6 small layers of He8 and the 8 small layer of Shan1 is better than others. The horizontal well positions were proposed in the study area with better gas sandstone in the 3D gas reservoir model.

scholarly journals A Comprehensive Coal Reservoir Classification Method Base on Permeability Dynamic Change and Its Application

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 644 ◽  
Author(s):  
Xinlu Yan ◽  
Songhang Zhang ◽  
Shuheng Tang ◽  
Zhongcheng Li ◽  
Yongxiang Yi ◽  
...  
Keyword(s):  
Coalbed Methane ◽  
Dynamic Change ◽  
Initial Permeability ◽  
Gas Production ◽  
Gas Desorption ◽  
Reservoir Permeability ◽  
Geological Conditions ◽  
Production Stages ◽  
Productivity Potential ◽  
Coal Reservoir

Due to the unique adsorption and desorption characteristics of coal, coal reservoir permeability changes dynamically during coalbed methane (CBM) development. Coal reservoirs can be classified using a permeability dynamic characterization in different production stages. In the single-phase water flow stage, four demarcating pressures are defined based on the damage from the effective stress on reservoir permeability. Coal reservoirs are classified into vulnerable, alleviative, and invulnerable reservoirs. In the gas desorption stage, two demarcating pressures are used to quantitatively characterize the recovery properties of permeability based on the recovery effect of the matrix shrinkage on permeability, namely the rebound pressure (the pressure corresponding to the lowest permeability) and recovery pressure (the pressure when permeability returns to initial permeability). Coal reservoirs are further classified into recoverable and unrecoverable reservoirs. The physical properties and influencing factors of these demarcating pressures are analyzed. Twenty-six wells from the Shizhuangnan Block in the southern Qinshui Basin of China were examined as a case study, showing that there is a significant correspondence between coal reservoir types and CBM well gas production. This study is helpful for identifying geological conditions of coal reservoirs as well as the productivity potential of CBM wells.

Study on System of Gravity Dams Aided Design

2011 ◽  
Vol 255-260 ◽  
pp. 3584-3588
Author(s):  
Zhi Yuan Hou ◽  
Bin Tian ◽  
Ze Yun Xiao
Keyword(s):  
Gravity Dam ◽  
Design System ◽  
Structure Modeling ◽  
Geological Modeling ◽  
Gravity Dams ◽  
Element Analysis ◽  
3D Finite Element ◽  
3D Geological Modeling ◽  
Aided Design ◽  
Analysis Stability

Since there are some characteristics such as correlation, repeatability and integrity during the gravity dam design process, an automatic gravity dam assistant design system was established by adopting C sharp programming language, Visual Studio Development Suite as well as material mechanics and Technology of Parametric Drawing. The System includes four modules: 3D geological modeling, gravity dam structure modeling, dam sections analysis and database management. These modules realized different specialty cooperation and offered many-side analysis such as: 3D finite element analysis, stability analysis, stress analysis, section optimization and report export.

Numerical Simulation of Gas Injection for CBM Openhole Cavity Completion Considering the Coal Vertical Fracture System

2011 ◽  
Vol 101-102 ◽  
pp. 298-301
Author(s):  
Xiao Yi Li ◽  
Zhi Ming Wang ◽  
Xin Wan ◽  
Yang Cao
Keyword(s):  
Coalbed Methane ◽  
Displacement Vector ◽  
Fluid Velocity ◽  
Stress Gradient ◽  
Fracture System ◽  
Vertical Fracture ◽  
Matrix Deformation ◽  
Vector Distribution ◽  
Tensile Fractures ◽  
Coal Reservoir

A discrete element numerical model simulating the process of gas pressurization in coalbed methane wells is built based on UDEC software. The model considers the unique vertical fracture system of the coal. Simulates the distribution of effective stress, pore pressure and the node displacement vector around the wellbore in the process of pressurization under different terrestrial stress conditions. The analysis shows that, reservoir fluid flow and matrix deformation in the pressurization of cavity completion can be better represented by taking coal's unique fracture system into consideration. Coal reservoir with anisotropic stress is more prone to rupture and collapse than that under isotropic condition. In the vertical fracture system, the discrepancy of the fluid velocity will lead to differences in formation stress gradient and help generate shearing fracture. Tensile fractures’ formation and growing trend can be reflected by nodal displacement vector distribution.

scholarly journals Petrophysical characterization of high-rank coal by nuclear magnetic resonance: a case study of the Baijiao coal reservoir, SW China

2018 ◽  
Vol 5 (12) ◽  
pp. 181411 ◽  
Author(s):  
Dongming Zhang ◽  
Yapei Chu ◽  
Shujian Li ◽  
Yushun Yang ◽  
Xin Bai ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Coalbed Methane ◽  
High Rank ◽  
Free Fluid ◽  
Permeability Model ◽  
Cutoff Value ◽  
Coal Reservoir ◽  
Nuclear Magnetic

To better apply nuclear magnetic resonance (NMR) to evaluate the petrophysical characterization of high-rank coal, six anthracite samples from the Baijiao coal reservoir were measured by NMR. The porosity, T 2 cutoff value, permeability and pore type were analysed using the transverse relaxation time ( T 2 ) spectrum before and after centrifugation. The results show that the T 2 spectrum of water-saturated anthracite can be divided into a discontinuous and continuous trimodal distribution. According to the connectivity among pores, three T 2 spectrum peaks were identified at the relaxation times of 0.01–1.7 ms, 1.7–65 ms and greater than 65 ms, which correspond to the micropores (less than 100 nm), mesopores (100–1000 nm) and macropores (greater than 1000 nm), respectively. Based on the T 2 cutoff value, we divided the T 2 spectrum into two parts: bound fluid and free fluid. By comparing two classic permeability models, we proposed a permeability model to calculate the permeability of anthracite. This result demonstrates that NMR has great significance to the exploration of coal reservoirs and to the understanding of the development of coalbed methane.

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