Effect of organic-matter type and thermal maturity on methane adsorption in shale-gas systems

2012 ◽  
Vol 47 ◽  
pp. 120-131 ◽  
Author(s):  
Tongwei Zhang ◽  
Geoffrey S. Ellis ◽  
Stephen C. Ruppel ◽  
Kitty Milliken ◽  
Rongsheng Yang
Keyword(s):  
Organic Matter ◽  
Shale Gas ◽  
Methane Adsorption ◽  
Thermal Maturity ◽  
Organic Matter Type

Accumulation Factors Analysis of Coal-Bearing Strata Shale Gas in Qinshui Basin

2013 ◽  
Vol 868 ◽  
pp. 121-124 ◽  
Author(s):  
Jun Yuan ◽  
Yan Bin Wang ◽  
Xin Zhang ◽  
Jing Jing Fan ◽  
Pei Xue
Keyword(s):  
Organic Matter ◽  
Mineral Composition ◽  
Shale Gas ◽  
Vitrinite Reflectance ◽  
Qinshui Basin ◽  
Factors Analysis ◽  
Upper Paleozoic ◽  
Organic Matter Type ◽  
Organic Matter Abundance

The Shanxi and Taiyuan formations in Permo-Carboniferous of upper Paleozoic Erathem of Qinshui Basin, not only has abundant coal and CBM resources, also has a lot of shales. By analyzing the shale thickness, organic matter type, organic matter abundance, vitrinite reflectance, mineral composition of the Permo-Carboniferous coal-bearing strata, considered that the shale thickness of coal-bearing strata in the Qinshui Basin is larger, the organic matter abundance is general, but maturity is high and full of rich brittle mineral. It is in favor of late fracturing.

scholarly journals Characteristics and Origin of Methane Adsorption Capacity of Marine, Transitional, and Lacustrine Shales in Sichuan Basin, China

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Xianglu Tang ◽  
Wei Wu ◽  
Guanghai Zhong ◽  
Zhenxue Jiang ◽  
Shijie He ◽  
...  
Keyword(s):  
Organic Matter ◽  
Water Content ◽  
Adsorption Capacity ◽  
Clay Minerals ◽  
Shale Gas ◽  
Sichuan Basin ◽  
Thermal Evolution ◽  
Methane Adsorption ◽  
Isothermal Adsorption ◽  
Xujiahe Formation

Adsorbed gas is an important component of shale gas. The methane adsorption capacity of shale determines the composition of shale gas. In this study, the methane adsorption capacity of marine, transitional, and lacustrine shales in the Sichuan Basin was analyzed through its isothermal adsorption, mineral composition, water content, etc. The results show that the methane adsorption capacity of marine (Qiongzhusi Formation and Longmaxi Formation), transitional (Longtan Formation), and lacustrine (Xujiahe Formation and Ziliujing Formation) shales is significantly different. The Longtan Formation has the strongest methane adsorption capacity. This is primarily related to its high organic matter and organic matter type III content. The methane adsorption capacity of the lacustrine shale was the weakest. This is primarily related to the low thermal evolution degree and the high content of water-bearing clay minerals. Smectite has the highest methane adsorption capacity of the clay minerals, due to its crystal structure. The water content has a significant effect on methane adsorption largely because water molecules occupy the adsorption site. Additionally, the temperature and pressure in a specific range significantly affect methane adsorption capacity.

scholarly journals Crude oils from Austral and Golfo San Jorge Basins. Similarity and differences based on Biomarker Ratios

DYNA ◽  
2021 ◽  
Vol 88 (216) ◽  
pp. 62-68
Author(s):  
Germán Javier Tomas ◽  
Walter Vargas ◽  
Adrián Javier Acuña
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Organic Matter ◽  
Crude Oil ◽  
Oxygen Concentration ◽  
Crude Oils ◽  
Geochemical Analysis ◽  
Type Ii ◽  
Thermal Maturity ◽  
Organic Matter Type

The biomarker profiles are characteristic of oils. The goal of this study was to evaluate the biomarkers in oil samples using geochemical analysis. Oil samples were obtained from Austral Basin and from Golfo San Jorge Basin. Specifically, the aliphatic and aromatic fractions were analyzed by Gas Chromatography coupled to Mass Spectrometry. Biomarker ratios were calculated for isoprenoids, terpanes, steranes to correlate the organic matter precursor, deposition environment, and others to differentiate distinct crude oil sources. Based on the specific parameters, the crude of the Austral Basin appears to have been generated from organic matter type II-III (mixed), in deposition environments with moderate oxygen concentration, associated with a siliciclastic lithology and a moderate to high thermal maturity. On the contrary, the crude oils from the Golfo San Jorge Basin displayed biomarkers profiles characteristics to a type II (marine) kerogen, corresponding to an anoxic deposition environment, carbonated lithology and low thermal maturity.

Shale Gas Resources Evaluation of the Songliao Basin

2014 ◽  
Vol 508 ◽  
pp. 129-132
Author(s):  
Xin Zhang ◽  
Jun Yuan ◽  
Pei Xue ◽  
Jing Jing Fan ◽  
Jin Wang
Keyword(s):  
Organic Matter ◽  
Mineral Composition ◽  
Shale Gas ◽  
Upper Cretaceous ◽  
Oil And Gas ◽  
Vitrinite Reflectance ◽  
Songliao Basin ◽  
Resources Evaluation ◽  
Organic Matter Type ◽  
Organic Matter Abundance

The Qingshankou and Nenjiang group in upper cretaceous of Songliao basin is a set of dark shale. Analyze the shale thickness, organic matter type, organic matter abundance, vitrinite reflectance, mineral composition of the permo-carboniferous coal-bearing strata. Consider that the thickness of shale in the Songliao basin is larger, despite the organic matter abundance is good, but maturity is lower, less of the formation of oil and gas.

Effect of Organic Matter and Thermal Maturity on Methane Adsorption Capacity on Shales from the Middle Magdalena Valley Basin in Colombia

2017 ◽  
Vol 31 (11) ◽  
pp. 11698-11709 ◽  
Author(s):  
Olga Patricia Ortiz Cancino ◽  
Deneb Peredo Mancilla ◽  
Manuel Pozo ◽  
Edgar Pérez ◽  
David Bessieres
Keyword(s):  
Organic Matter ◽  
Adsorption Capacity ◽  
Methane Adsorption ◽  
Thermal Maturity

scholarly journals Pore structure and sorption capacity investigations of Ediacaran and Lower Silurian gas shales from the Upper Yangtze platform, China

2021 ◽  
Vol 7 (3) ◽  
Author(s):  
Zhazha Hu ◽  
Garri Gaus ◽  
Timo Seemann ◽  
Qian Zhang ◽  
Ralf Littke ◽  
...  
Keyword(s):  
Organic Matter ◽  
Pore Structure ◽  
Clay Minerals ◽  
Sorption Capacity ◽  
Shale Gas ◽  
Gas Storage ◽  
Micropore Volume ◽  
Thermal Maturity ◽  
Yangtze Platform ◽  
Lower Silurian

Abstract The shale gas potential of Ediacaran and Lower Silurian shales from the Upper Yangtze platform is assessed in this study with a focus on the contributions of clay minerals and organic matter to sorption capacity. For this purpose, a multidisciplinary assessment was carried out using petrophysical, mineralogical, petrographic and geochemical methods. In terms of TOC contents (4.2%), brittle mineral contents (68.6%) and maximum gas storage capacities (0.054–0.251 mmol/g) Ediacaran shales from this study show comparable properties to other producing shale gas systems although the thermal maturity is extremely high (VRr = 3.6%). When compared to lower Silurian shales from the same region, it is evident that (1) deeper maximum burial and (2) a lack of silica-associated preservation of the pores resulted in a relatively lower mesopore volume, higher micropore volume fraction and lower overall porosity (Ediacaran shales: 1.4–4.6%; Silurian shales: 6.2–7.4%). Gas production is therefore retarded by poor interconnectivity of the pore system, which was qualitatively demonstrated by comparing experimental gas uptake kinetics. TOC content exhibits a prominent control on sorption capacity and micropore volume for both shales. However, different contributions of clay minerals to sorption capacity were identified. This can partly be attributed to different clay types but is likely also related to burial-induced recrystallisation and different origins of illite. Additionally, it was shown that variations in sorption capacity due to incorrect estimates of clay mineral contribution are in the same range as variations due to differences in thermal maturity. Article highlights Pore structure and gas storage characteristics are evaluated for the first time for Ediacaran Shales from the Upper Yangtze platform Due to a lower free gas storage capacity and diffusivity, the Ediacaran shale can be regarded as a less favorable shale gas prospect when compared to the Silurian shale Clay mineral contribution to sorption capacity is evaluated taking clay mineralogy into consideration Maturity-related changes of organic matter sorption capacity have been discussed on the basis of a compiled data set

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