Key Laboratory of CBM Resource and Reservoir generating Process

China, China

Key Laboratory of CBM Resource and Reservoir generating Process

China, China
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Zou M.,China University of Geosciences | Zou M.,Key Laboratory of CBM Resource and Reservoir Generating Process | Wei C.,China University of Geosciences | Wei C.,Key Laboratory of CBM Resource and Reservoir Generating Process | And 3 more authors.
Mining Science and Technology | Year: 2010

Based on regional CBM geological characteristics and drainage data of three typical Coalbed Methane (CBM) wells in the southern Qinshui Basin, history matching, productivity prediction and factor analysis of gas production control are conducted by using COMET3 reservoir modeling software. The results show that in the next 20 years, the cumulative and average daily gas production of the QN01 well are expected to be 800×104 m3 and 1141.1 m3/d, for the QN02 well 87×104 m3 and 1202.7 m3/d and 97.5×104 m3 and 133.55 m3/d for the QN03 well. Gas content and reservoir pressure are the key factors controlling gas production in the area; coal thickness, permeability and porosity are less important; the Langmuir volume, Langmuir pressure and adsorption time have relatively small effect. In the process of CBM recovery, the material source and driving force are the key features affecting gas productivity, while the permeation process is relatively important and the desorption process has some impact on gas recovery. © 2010 China University of Mining and Technology.


Lei B.,China University of Mining and Technology | Lei B.,Key Laboratory of CBM Resource and Reservoir Generating Process | Fu X.,China University of Mining and Technology | Fu X.,Key Laboratory of CBM Resource and Reservoir Generating Process | And 7 more authors.
International Journal of Mining Science and Technology | Year: 2012

Improving the accuracy and precision of coal bed methane (CBM) estimates requires correction of older data from older coal exploration surveys to newer standards. Three methods, the depth gradient method, the contour aerial weight method, and the well-point aerial weight method, were used to estimate the correction coefficient required to predict CBM gas content from coal exploration data. The data from the Nos. 3 and 15 coal seams provided the coal exploration data while the CBM exploration stages within the X1 well block located in the southern part of the Qinshui Basin provided the data obtained using newer standards. The results show the correction coefficients obtained from the two aerial weight methods are similar in value but lower than the one obtained from the depth gradient method. The three methods provide similar results for the Nos. 3 and 15 seams in that the correction factor is lower for the former seam. The results from the depth gradient method taken together with the coal seam burial depth and the coal rank suggest that variations in the correction factor increase linearly along with coal seam burial depth and coal rank. The correlation obtained can be applied to exploration and the evaluation of coal bed gas resources located in coalfields. © 2012 Published by Elsevier B.V. on behalf of China University of Mining and Technology.


Wei C.,China University of Mining and Technology | Wei C.,Key Laboratory of CBM Resource and Reservoir generating Process | Qin Y.,China University of Mining and Technology | Qin Y.,Key Laboratory of CBM Resource and Reservoir generating Process | And 4 more authors.
International Journal of Coal Geology | Year: 2010

This paper presents a numerical study on the formation history of coalbed methane (CBM) reservoir in the southeast edge of Ordos Basin, China. The coal seams studied belong to the Late Palaeozoic coal-bearing series. These coal seams have a burial history and experienced the process of subsidence, rapid subsidence alternated with uplift and then uplift, sequentially, and underwent the geothermal actions at normal, extremely high, and then normal temperatures, respectively. Coal organic matter of the coal seams matured in the Triassic Period and in the Late Jurassic to Early Cretaceous Period. The results from numerical simulation reveal that CBM reservoir evolution history can be classified into five stages, namely primary, initial, stagnant, active and dissipative stages. In the first (primary) stage, coal rank was very low and there was little methane generated and stored in the coal seams. In the second (initial) stage, the coal was converted to middle-high volatile bituminous coal. As a result, a certain amount of methane was generated and began to accumulate in coal seams except part of it escaped from coal seams by diffusion and cap outburst. In the third (stagnant) stage, generation of methane was almost stagnant due to the temperature of the coal seam that dropped slightly and the maturation of coal organic matter stopped. Meanwhile CBM would keep dissipating through diffusion. In the fourth (active) stage, coal rank varied from high volatile bituminous coal A to semianthracite which accelerated pyrolysis gas formation and resulted in a large amount of methane generated at a high speed. During this period, CBM was increasingly accumulated in coal seams although there would be considerable amounts of gas dissipated from the coal seams. In the last (dissipative) stage, due to coal seams uplifted at various rates and no more methane generated, CBM was continuously dissipated by diffusion throughout the whole coal seams and by permeation at some local areas. The simulation provides insights for further interpretation of how many factors that control or affect the CBM reservoir formation history and CBM accumulation. These factors include features of coal-bearing series, characteristics of coal seams, physical properties of coal reservoir, tectonic evolution history, burial history and geothermal conditions, etc. In particular, tectonic evolution history and gas generation are critical. Under given conditions, CBM reservoirs in the study area were developed in different ways and the CBM was accumulated in the reservoirs at different levels. For example, the west part of study area is favourable for CBM accumulation. As a result, the gas content of the main coal seams in this region has a maximum of about 28 m3/t at depths of 900-1100 m, and generally increases with the increasing of burial depth from the east to the west. The coal reservoir is under-saturated in the east part where the burial depth is shallower than about 500 m while the west part is saturated. There is a close correlation of the lateral distribution of both gas content and saturation to the gas generation in the geological history. © 2009 Elsevier B.V.


Wang M.,China University of Mining and Technology | Wang M.,Key Laboratory of CBM Resource and Reservoir Generating Process | Zhu Y.-M.,China University of Mining and Technology | Zhu Y.-M.,Key Laboratory of CBM Resource and Reservoir Generating Process | And 2 more authors.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2012

In this paper, based on the research on gas geological characteristics of 10 pairs of outburst mines, we analyzed the gas content, pressure and measured data of emission quantity, summarized the rules of gas geology in Kailuan Mining Area, and put forward the gas occurrence under stepwise tectoniccontrol mode. The results show that the axial part of syncline structure is beneficial to the gas occurrence, and the gas unusual district distribution is controlled by the distributions of reverse fault, groundwater runoff and magmatic rock. Meanwhile, the tectonic setting of gas occurrence is established by the regional structure, while the gas occurrence in Kailuan Mining Area is controlled by the strurctures in the mining area level. Moreover, the gas distribution is different in each syncline structure, and the gas occurrence in one mine is controlled by the structures in the mine area.


Jiang B.,China University of Mining and Technology | Jiang B.,Key Laboratory of CBM Resource and Reservoir generating Process | Qu Z.,China University of Mining and Technology | Qu Z.,Key Laboratory of CBM Resource and Reservoir generating Process | And 3 more authors.
International Journal of Coal Geology | Year: 2010

Tectonically deformed coal is defined as coal formed by superimposed reformations from tectonic stress. The Huaibei coalfield is typically composed of various tectonically deformed coals containing rich coalbed methane resources. However, the occurrence of coal seam in this area is complicated largely by the structural deformation, which has not yet been evaluated systematically for exploration and exploitation of coalbed methane. In this study, tectonism in Huaibei coalfield is discussed by combining systematic analyses on the occurrence of coal seams and the formation of coalbed methane reservoirs. The study shows that, with structural deformation in the study area, the coal seams in Huaibei coalfield are distributed in north-south tectonic blocks and east-west tectonic zones. North tectonic block of Huaibei coalfield is not favourable for exploitation of coalbed methane because of low gas content or disadvantageous structural conditions. Within the south tectonic block, the east Suzhou syncline contains high gas content but coal permeability is very low. This area is generally not suitable for exploitation of coalbed methane and is a dangerous mining area due to gas outburst because of the widely developed mylonitic coals. South Suzhou and Nanping synclines in the middle part of the south tectonic block are exposed to relatively weak structural deformations. These synclines contain coals with high gas content and moderate permeability, which are beneficial for exploration and exploitation of coalbed methane. Linhuan mining area in the south tectonic block is generally not suitable for exploitation of coalbed methane, mainly because of well developed normal faults and interlayer slip structure, and presence of mylonitic coal, resulting in low gas content and poor structural conditions for mining coalbed methane. In contrast, Guoyang mining area in the west part of the south tectonic block, where tectonically deformed coal was generally underdeveloped, is a potential area for exploration and exploitation of coalbed methane because of moderate gas content and possibly higher permeability of its coal. © 2009 Elsevier B.V.


Zou M.,China University of Mining and Technology | Zou M.,Key Laboratory of CBM Resource and Reservoir Generating Process | Wei C.,China University of Mining and Technology | Wei C.,Key Laboratory of CBM Resource and Reservoir Generating Process | And 4 more authors.
Petroleum Geoscience | Year: 2013

Based on the characteristics of seven representative coalbed reservoirs in the Qinshui Basin in Shan'xi Province, China, the reservoirs were classified as gas pressure reservoirs, water pressure reservoirs or hybrid pressure reservoirs. Reservoir modelling technology was adopted to study the 1000 day recoverability and reservoir pressure transmission process of three typical coalbed methane (CBM) wells, each of which represents one of the three coalbed reservoir classifications identified. The results indicate that the three reservoirs are quite different in terms of their drainage performance. For gas pressure reservoirs, reservoir pressure changes in a very small region around the well bore. The gas production of this type of reservoir is very low; hence, integrated coal and gas mining may be appropriate to enhance its recovery. Reservoir pressure propagates further in water pressure reservoirs but declines gradually. The gas recoverability in water pressure reservoirs is also low, which indicates that effective water drainage is the key technology for improving it. The pressure in hybrid pressure reservoirs propagates moderately in the whole effective region. This type of reservoir has the strongest gas recoverability and is suitable for CBM exploitation using surface to reservoir boreholes. © 2013 EAGE/The Geological Society of London.


Zou M.,China University of Mining and Technology | Zou M.,Key Laboratory of CBM Resource and Reservoir Generating Process | Wei C.,China University of Mining and Technology | Wei C.,Key Laboratory of CBM Resource and Reservoir Generating Process | And 7 more authors.
Energy and Fuels | Year: 2013

The widely used coalbed methane (CBM) flow model-triple porosity/dual permeability (TPDP) model indicates that coal pores can be divided into micro-trans-pores, meso-macro-pores, and fractures, while CBM can flow via meso-macro-pores and fractures. The mechanism to obtain the reservoir parameters of these two flowing systems has been given little attention in the TPDP model. In this study, nuclear magnetic resonance (NMR), mercury intrusion porosimetry (MIP), and other routine core analysis methods were conducted on nine coal samples to classify coal pore types, transform transverse relaxation time to pore radius, and estimate porosity and permeability of meso-macro-pores and fractures. Results show that the two referenced relaxation times of T 2C1 and T2C2, which were identified from the curves of irreducible and full water saturations obtained from NMR experiments, can classify coal pores into fractures (T2 > T2C2), meso-macro-pores (T2C1 < T2 < T2C2), and micro-trans-pores (T2 < T2C1). The dividing point of micro-trans-pores and meso-macro-pores, which was obtained from NMR and MIP (mercury intrusion porosimetry) experiments, provided another method for transforming transverse relaxation time to pore radius. Based on the classification results and routine core analysis methods, the porosity of meso-macro-pores and fractures were calculated, and the relationship between air permeability and porosity of meso-macro-pores and fractures was finally proposed. This paper provides an effective method for obtaining the permeability and porosity of meso-macro-pores and fractures using the TPDP model to simulate the performances of CBM wells. © 2013 American Chemical Society.


Shao Y.,China University of Mining and Technology | Shao Y.,Key Laboratory of CBM Resource and Reservoir Generating Process | Guo Y.,China University of Mining and Technology | Guo Y.,Key Laboratory of CBM Resource and Reservoir Generating Process | And 5 more authors.
Mining Science and Technology | Year: 2011

In order to discuss the geochemical characteristic of REEs (rare earth elements) and their geological application, we measured the contents of rare earth elements, trace elements and minerals of 29 Lopingian (Late Permian) mudstone samples in Panxian county, carrying out ICP-MS and XRD analysis. The results show that the amount of REEs (185.56-729.46 × 10-6) is high. The ratios of w(LREE)/w(HREE) (6.84-13.86) and w(La)N/w(Yb) N (1.01-3.02) show clear differentiation of LREEs and HREEs. ΣREE has a significantly or critically positive correlation with lithophile elements Th, Nb, Ta, Ti, Ga, Sc, Cs, Zr, Hf, Sr, Be and chalcophile element Zn, a critically negative correlation with siderophile element Fe and a slightly positive correlation with illite, illite smectite mixed layers and siderite. REEs originate mainly from terrigenous minerals, in an inorganic phase. Source rocks of our samples consist of Emeishan basalt and a small part of sedimentary rocks, as suggested by the distribution patterns of REEs and w(∑REE)-w(La)/w(Yb) diagram. Moreover, abnormal surfaces near the sequence boundaries (SB2, SB3, SB4) are related with the boundaries, identified by geochemical characteristics of the REEs, such as ∑REE, w(LREE)/w(HREE), Eu/Eu and Ceanom. © 2011 Elsevier B.V. All rights reserved.


Wu L.,China University of Mining and Technology | Wu L.,Key Laboratory of CBM Resource and Reservoir Generating Process | Yanming Z.,China University of Mining and Technology | Yanming Z.,Key Laboratory of CBM Resource and Reservoir Generating Process | And 3 more authors.
Mining Science and Technology | Year: 2011

The Qiwu Mine is located in the Ten Xian coal field of Shandong province. It experienced repeated volcanic activity, after the coal beds formed, where magma intrusion was significant. The effect of coal reservoir porosity after magma intrusion was studied by analysis of regional and mine structure and magmatic activity. Experimental methods including maceral measurement under the microscope and mercury porosimetry were used for testing the pore structure. The authors believe that magma intrusion into low-rank bituminous coal causes reservoir porosity to gradually increase: the closer to the magmatic rock a sample is, the less the porosity. The pore size distribution also changes. In the natural coal bed the pore size is mainly in the transitive and middle pore range. However, the coal changes to anthracite next to the magmatic rock and larger pores dominate. Regional magma thermal evolution caused coal close to magmatic rock to be roasted, which reduced the volatile matter, developed larger holes, and destroyed plant tissue holes. The primary reason for a porosity decrease in the vicinity of magmatic rock is that Bituminite resulting from the roasting fills the holes that were present initially. © 2011, China University of Mining & Technology. All rights reserved.


Shen Y.-L.,China University of Mining and Technology | Shen Y.-L.,Key Laboratory of CBM Resource and Reservoir Generating Process | Guo Y.-H.,China University of Mining and Technology | Guo Y.-H.,Key Laboratory of CBM Resource and Reservoir Generating Process | And 3 more authors.
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2012

Based on the observation and description of outcrop and drill cores, correlation of well logging, granularity analysis, identification of rock thin section, the delta formed from Carboniferous to Permian were divided into four types. Variety factors, which control the deposition mechanism of delta, are considered in this classification scheme. These types and features of delta were controlled by many factors, for instance, paleotopography, river type, density difference between river water and water basin, hydrodynamic condition of water basin, etc. The results are as follows. In the Taiyuan stage of the early Permian, shallow water meandering river delta develops with epicontinental sea background, and has the characteristics of plane jet, weak underflow and low extension of sand body. It develops shallow water meandering river delta in the residual epicontinental sea-coastal lakes background in the Shanxi stage of the early Permian, with the features of axial jet, significant river-controlling effect and lobate plane. Shallow water braided river delta formed in coastal inland lakes grows in Shihezi stage of middle Permian. The sand body extends relatively far due to plane jet; and mult-stage erosion and overlay are obvious. There is the inland lake delta developed in the Shiqianfeng stage of late Permian.

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