scholarly journals Petrographic assessment of coal gas content

2019 ◽  
Vol 109 ◽  
pp. 00004
Author(s):  
Volodymyr Baranovskyi ◽  
Liubov Kuznetsova
Keyword(s):  
Gas Content ◽  
Generation Process ◽  
Gas Generation ◽  
Coal Gas ◽  
Quantitative Calculation ◽  
Petrographic Method ◽  
Characteristic Features ◽  
Natural Coal

Traces of the gas generation process on natural coal burstings have been identified and documented using the petrographic method. Their characteristic features were described. The methodology of their quantitative calculation is proposed in order to assess the modern gas content of coals.

scholarly journals Coupling between Source Rock and Reservoir of Shale Gas in Wufeng-Longmaxi Formation in Sichuan Basin, South China

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2679
Author(s):  
Yuying Zhang ◽  
Shu Jiang ◽  
Zhiliang He ◽  
Yuchao Li ◽  
Dianshi Xiao ◽  
...  
Keyword(s):  
Source Rock ◽  
Shale Gas ◽  
Sichuan Basin ◽  
Gas Content ◽  
Potential Zone ◽  
Hydrocarbon Generation ◽  
Gas Generation ◽  
Longmaxi Formation ◽  
Siliceous Shale ◽  
Organic Pores

In order to analyze the main factors controlling shale gas accumulation and to predict the potential zone for shale gas exploration, the heterogeneous characteristics of the source rock and reservoir of the Wufeng-Longmaxi Formation in Sichuan Basin were discussed in detail, based on the data of petrology, sedimentology, reservoir physical properties and gas content. On this basis, the effect of coupling between source rock and reservoir on shale gas generation and reservation has been analyzed. The Wufeng-Longmaxi Formation black shale in the Sichuan Basin has been divided into 5 types of lithofacies, i.e., carbonaceous siliceous shale, carbonaceous argillaceous shale, composite shale, silty shale, and argillaceous shale, and 4 types of sedimentary microfacies, i.e., carbonaceous siliceous deep shelf, carbonaceous argillaceous deep shelf, silty argillaceous shallow shelf, and argillaceous shallow shelf. The total organic carbon (TOC) content ranged from 0.5% to 6.0% (mean 2.54%), which gradually decreased vertically from the bottom to the top and was controlled by the oxygen content of the bottom water. Most of the organic matter was sapropel in a high-over thermal maturity. The shale reservoir of Wufeng-Longmaxi Formation was characterized by low porosity and low permeability. Pore types were mainly <10 nm organic pores, especially in the lower member of the Longmaxi Formation. The size of organic pores increased sharply in the upper member of the Longmaxi Formation. The volumes of methane adsorption were between 1.431 m3/t and 3.719 m3/t, and the total gas contents were between 0.44 m3/t and 5.19 m3/t, both of which gradually decreased from the bottom upwards. Shale with a high TOC content in the carbonaceous siliceous/argillaceous deep shelf is considered to have significant potential for hydrocarbon generation and storage capacity for gas preservation, providing favorable conditions of the source rock and reservoir for shale gas.

scholarly journals Controls on Gas Domains and Production Behaviour in A High-Rank CSG Reservoir: Insights from Molecular and Isotopic Chemistry of Co-Produced Waters and Gases from the Bowen Basin, Australia

Geosciences ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 74 ◽  
Author(s):  
Stephanie K. Hamilton ◽  
Suzanne D. Golding ◽  
Joan S. Esterle ◽  
Kim A. Baublys ◽  
Brycson B. Ruyobya
Keyword(s):  
Carbon Isotope ◽  
Vitrinite Reflectance ◽  
Isotope Analysis ◽  
Co2 Reduction ◽  
Production Performance ◽  
High Rank ◽  
Gas Content ◽  
Coal Seams ◽  
Gas Generation ◽  
Geographic Variations

This paper uses hydrochemical and multi-isotope analysis to investigate geological controls on coal seam gas (CSG) saturation domains and gas well production performance in a high-rank (vitrinite reflectance (Rv) > 1.1) CSG field in the north-western Bowen Basin, Australia. New hydrochemical and stable isotope data were combined with existing geochemical datasets to refine hypotheses on the distribution and origins of CSG in two highly compartmentalized Permian coal seams. Stable isotopic results suggest that geographic variations in gas content, saturation and production reflect the extent of secondary microbial gas generation and retention as a function of hydrodynamics. δ13C and δ2H data support a gas mixing hypothesis with δ13C-CH4 increasing from secondary biogenic values to thermogenic values at depth (δ13C −62.2‰ to −46.3‰), whereas correlated methane and carbon dioxide carbon isotope compositions, Δ13C(CO2–CH4) values and δ13CDIC/alkalinity trends are largely consistent with microbial CO2 reduction. In addition, below 200 m, the majority of δ13C-CO2 values are positive (δ13C: −1.2‰ to 7.1‰) and δ13CDIC shows an erratic increase with depth for both seams that is characteristic of evolution via microbial activity. The progression of carbon isotope values along the CO2 reduction fractionation line suggests progressive depletion of the CO2 reservoir with increasing depth. Faults clearly segment coal seams into areas having significantly different production, with results of geochemical analysis suggesting that pooling of biogenic gas and waters and enhanced methanogenesis occur north of a faulted hinge zone.

scholarly journals APPLICATION OF ONE-DIMENSIONAL PALEOTEMPERATURE MODELING TO ESTIMATE THE HYDROCARBON POTENTIAL OF CRETACEOUS SEDIMENTS OF THE MIDDLE AMUR SEDIMENTARY BASIN

2021 ◽  
Vol 40 (4) ◽  
pp. 87-98
Author(s):  
P.N. Prokhorova ◽  
◽  
E.P. Razvozzhaeva ◽  
V.I. Isaev ◽  
◽  
...  
Keyword(s):  
Oil And Gas ◽  
Sedimentary Basin ◽  
Gas Content ◽  
Hydrocarbon Potential ◽  
Hydrocarbon Generation ◽  
Gas Generation ◽  
One Dimensional ◽  
Middle Amur Sedimentary Basin ◽  
History Of ◽  
History Of Formation

The prospects of oil and gas content of the Cretaceous-Paleogene deposits of the Middle Amur sedimentary basin within the Pereyaslavsky graben are clarified on the basis of updated data on the tectonic-stratigraphic complexes of the basin using the method of one-dimensional paleotemperature modeling. It is established that throughout the history of formation of the studied part of Pereyaslavsky graben hydrocarbon generation could occur in lower Cretaceous sediments of the Assikaevsky and Alchansky/Strelnikovsky suites. The gas generation conditions for the Assykaevsky formation are still maintained.

scholarly journals The Earth as a living planet: human-type diseases in the earthquake preparation process

2013 ◽  
Vol 13 (1) ◽  
pp. 125-139 ◽  
Author(s):  
Y. F. Contoyiannis ◽  
S. M. Potirakis ◽  
K. Eftaxias
Keyword(s):  
Complex Systems ◽  
Wavelet Decomposition ◽  
Time Window ◽  
Generation Process ◽  
Earthquake Preparation ◽  
The Earth ◽  
Earthquake Generation ◽  
Critical Characteristics ◽  
Characteristic Features ◽  
Earthquake Process

Abstract. The new field of complex systems supports the view that a number of systems arising from disciplines as diverse as physics, biology, engineering, and economics may have certain quantitative features that are intriguingly similar. The Earth is a living planet where many complex systems run perfectly without stopping at all. The earthquake generation is a fundamental sign that the Earth is a living planet. Recently, analyses have shown that human-brain-type disease appears during the earthquake generation process. Herein, we show that human-heart-type disease appears during the earthquake preparation of the earthquake process. The investigation is mainly attempted by means of critical phenomena, which have been proposed as the likely paradigm to explain the origins of both heart electric fluctuations and fracture-induced electromagnetic fluctuations. We show that a time window of the damage evolution within the heterogeneous Earth's crust and the healthy heart's electrical action present the characteristic features of the critical point of a thermal second-order phase transition. A dramatic breakdown of critical characteristics appears in the tail of the fracture process of heterogeneous system and the injured heart's electrical action. Analyses by means of Hurst exponent and wavelet decomposition further support the hypothesis that a dynamical analogy exists between the geological and biological systems under study.

Gas Desorption of Different Particle Size Coal under the Effect of Electromagnetic Radiation

2014 ◽  
Vol 953-954 ◽  
pp. 1205-1209
Author(s):  
De Zhu Cheng ◽  
Ai Ling Du ◽  
Shan Chao Jiang ◽  
Ai Qin Du
Keyword(s):  
Particle Size ◽  
Optical Fiber ◽  
Electromagnetic Radiation ◽  
Coal Particle ◽  
Optical Fiber Sensor ◽  
Gas Content ◽  
Fiber Sensor ◽  
Particle Sizes ◽  
Coal Gas ◽  
Gas Desorption

Many factors can influence coal gas desorption. In this paper, the impact of coal particle size on coal gas desorption under the effect of microwave radiation was mainly studied. Infrared (IR) spectroscopy and optical fiber sensor were used to on-line detect and the qualitative and quantitative analysis of the desorbed gas. The analysis results of the infrared spectrogram showed that under the effect of electromagnetic radiation (2450Hz, 1.5μT), different particle sizes of coal sample could desorb gas which contained carbon dioxide, carbon monoxide and methane. The comparison of gas content detected by optical fiber sensor indicated that coal particle sizes had a significant influence on coal gas desorption. When coal particle was between 100 and 200 meshes, the gas content reached up to 27.58 m3/t.

scholarly journals The Relationship between Mining-Induced Stress and Coal Gas under an Optimized Support Scheme: A Case Study in the Guanyinshan Coal Mine, China

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Tianjun Zhang ◽  
Jiaokun Wu ◽  
Yong Chen ◽  
Hong Ding ◽  
Hongyu Ma ◽  
...  
Keyword(s):  
Gas Pressure ◽  
Gas Content ◽  
Rock Support ◽  
Drill Cuttings ◽  
Coal Gas ◽  
Gas Desorption ◽  
Induced Stress ◽  
Coal And Gas Outbursts ◽  
Residual Gas ◽  
The Relationship

Stress is one of the main factors influencing coal and gas outbursts. The apparent effects of the crustal stress, the structural stress, and the mining-induced stress increase as the depth of mining increases. At present, there have been few studies of the relationship between the comprehensive analyses of the crustal stress, mining-induced stress, and coal gas. The in situ measurement of the relationship between stress-related behaviors and coal gas under the influence of mining was conducted through experimental analysis of surrounding rock support and coal and gas outburst control and optimization of surrounding rock support materials and system construction. The results showed that the mining-induced stress first increased to a peak value, then gradually decreased, and tended to stabilize as the footage progresses. Stress appears at 96 m ahead due to mining; after 57 m of advancing, there is a large increase until it passes through this area. The stress in front of the working face increases linearly, and the increase range is obviously larger than that of the coal body in a certain range on both sides. The support anchoring force gradually decreased and tended to be stable after rapidly increasing to a maximum value. The deep displacement of the roof increased linearly and tended to be stable after reaching an accumulated displacement which can reach 16-28 mm. The residual gas pressure in front of mining operations decreased rapidly, and beyond 15 m on each side of the roadway, it decreased significantly. The residual gas pressure and gas content were consistent with the gas desorption index of drill cuttings due to the influences of gas predrainage and mining. The stress along the direction of the roadway and the residual gas content, the residual gas pressure, and the gas desorption index of drill cuttings conform to the logarithmic functional relationship. The research results provide a basis for the comprehensive prevention and control of coal and gas outbursts from multiple angles considering stress, coal, and gas.

BHP PETROLEUM'S NEW TECHNOLOGY METHANOL RESEARCH PLANT

1994 ◽  
Vol 34 (1) ◽  
pp. 121
Author(s):  
I. Rees
Keyword(s):  
Large Scale ◽  
New Technology ◽  
Scale Up ◽  
Generation Process ◽  
Plant Design ◽  
Gas Generation ◽  
Offshore Production ◽  
New Synthesis ◽  
Vessel Motion ◽  
Plant Capacity

BHP Petroleum (BHPP) is in the process of constructing a 164 tonne per day Methanol Research Plant (MRP) on the outskirts of Melbourne. The plant is designed to demonstrate and develop the Leading Concept Methanol (LCM) technology of ICI Katalco. The plant will be the first large scale demonstration of this technology and is part of BHPP's strategy to develop viable options for the development of Australia's uncommitted gas resources. The strategy is to demonstrate and develop the LCM technology onshore and then to apply the technology to an offshore production environment.The LCM technology as applied to the MRP involves a new synthesis gas generation process and other features which result in a compact plant design with low utilities requirements and insensivity to vessel motion effects.Although the MRP is being built primarily for Research and Development (R&D) it has been sized consistent with future scale up to world scale methanol capacity. The plant capacity is sufficient to supply a major share of Australia's methanol demand, particularly that of the immediate vicinity in Victoria.The construction of the plant started in April, 1993 and is currently about 85 per cent complete and on schedule. Final mechanical completion is scheduled for mid 1994 with commissioning in the third quarter. The capital cost of the project is approximately A$70 million.

scholarly journals Influence of black shale composition on methane adsorption and gas content: Implications for gas storage in the Longmaxi black shales

2018 ◽  
Vol 22 (1) ◽  
pp. 59-63 ◽  
Author(s):  
Haihua Zhu ◽  
Tingshan Zhang ◽  
Jun Lang ◽  
Jianli Zeng ◽  
Xing Liang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Adsorption Capacity ◽  
Methane Adsorption ◽  
Black Shales ◽  
Gas Content ◽  
Gas Generation ◽  
Langmuir Adsorption ◽  
Longmaxi Shale ◽  
Scatter Plots ◽  
Shale Composition

The influence of shale composition on methane adsorption capability and gas content is investigated using 14 samples from Well YS8 in the southern Sichuan Basin, China. The results show that the Langmuir adsorption capacity of the Longmaxi shale is mainly a function of the total organic carbon (TOC) content. When TOC is ~1.1%, 50% CH4 is adsorbed onto the surface of the organic matter. The mineral content has limited control on the adsorption capacity of the Longmaxi shales. Organic matter is also a major control on gas content when TOC content is <1.0%. When TOC is >1.0%, gas content remains constant, indicating that gas preservation is more important than gas generation and rock adsorption capacity. Scatter plots of TOC versus gas content and, Langmuir adsorption capacity shows that when TOC is <2.0%, CH4 occurs both as free and absorbed gas, and CH4 occurs mainly as absorbed gas when TOC is >2.0%.

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