Abstract The low permeability of shale, in accretionary complexes and passive continental margins, influences pore pressure generation, thus induces deformation fault slip behavior. It is also key hindering the ability to evaluate shale gas production. Gas commonly used measuring generally yields high values than that liquids, due slippage effect. Separation effect from a critical task study low‐permeability media. This measured ( K g ) Longmaxi parallel bedding (L1P) perpendicular (L1V)...

Understanding the spatial pattern of soil lead (Pb) levels is essential to protecting human health. Most previous studies have examined Pb distributions by either urbanization gradient or land-use type. Few studies, however, both factors together. It remains unclear whether impacts land use on are consistent along gradient. To fill this gap, we investigated variations in level under different types Beijing, China. We classified degree as urban core, transitional zone, suburban area and type...

Pyrolytic oil production from kerogens is of scientific and industrial importance for the efficient utilization resources. Minerals exert a significant impact on this process. In study, pyrolysis kinetics process organic‐rich mudstones in Junggar basin are investigated by characterization thermogravimetric experiments. The major minerals kerogen, except pyrite, eliminated HF/HCl treatment. To conduct detailed comparison rocks kerogens, deconvoluted into two stages, including conversion...

Matrix diffusivity is vital for developing tight sandstone and shale gas reservoirs. This study proposes a method to test the diffusivities of core under confining pressure conditions using diffusion technique. The methane helium were examined in fine-grained rocks (sandy shale, silty sandstone, shale) specific stress conditions. results revealed that varied among samples. sandstones exhibited higher than sandy mudstone, shale. Helium shales mudstones 1 order magnitude smaller, while 2...

31 natural gases in the western Qaidam Basin of China were collected and analyzed for gas composition including light hydrocarbons (C 5 -C 7 ) carbon isotopic characteristics. Based on genetic type obtained from C 1 3 fractions, four types are identified: oil-type gas, coal-type biodegraded mixed gas. The is predominant-type Basin; mainly distributed Zhahaquan Nanyishan fields; Zhahaquan, Wunan, Huatugou Yuejinerhao fields. According to empirical relationship between δ 13 equivalent...

Organic-rich tuffaceous mudstones are important oil and gas resources. The systematic study of the pyrolysis kinetics characteristics can not only provide theoretical basis for rational development efficient utilization these rocks but also is an complement to research on organic-rich rocks. In this study, kinetics, behavior, mechanism mudstone in Junggar Basin were clarified by thermogravimetric analysis. organic structure mineral composition identified Rock-Eval, Fourier transform infrared...

Gold tube thermal simulation experiments represent a pivotal tool in exploring hydrocarbon generation kinetics source rocks. Compared to other reaction systems, the environment and pyrolysis product composition within gold display greater resemblance actual geological conditions, especially for coal-based rocks with poor removal capacity. The kerogen is close contact various products reacts each tube. Researchers have carried out extensive research application based on tubes recent years....

Abstract Residual bitumen in organic‐rich shale of oil windows exists widely, and its effect on the gas storage capacity could be two‐fold. Bitumen occupy block nanopores shale, thereby reducing capacity. On other hand, dissolved reservoirs, leading to enhanced To quantify gas‐in‐place (GIP) estimation lacustrine micropore characteristics methane sorption original bitumen‐free from Triassic Yangchang Formation Ordos Basin, combined with dissolution for isolated bitumen, were analyzed...

Abstract The thermal stability of organic acids has a close relationship with the formation mechanism secondary pores in deep reservoirs. Experiments were conducted to investigate oxalic acid under high pressure and influence K-feldspar on decomposition. experiment temperatures set range 130-330°C each was performed for 72h 60MPa. Results show that both temperature have significant decomposition acid. decomposed slowly at less than 180°C, most between 180°C 230°C. Besides, decarboxylation...

Abstract In order to understand the change of adsorption capacity methane (CH 4 ) after carbon dioxide (CO 2 injection into shale at high pressure condition. The pore structure character and CH were analysed via low-pressure N isothermal measurements for original supercritical CO (ScCO treated samples from Jiaoshiba area in Sichuan Basin. results show that ScCO have lower specific surface areas, less micropore mesopore, more macropore compare one. For samples, decrease with increasing...

Abstract Desorption gases of four lacustrine shale cores from the Triassic Yanchang formation Ordos Basin, China were collected, and their molecular carbon isotope compositions analyzed in this study. Results show that hydrocarbon desorption gas are dominated by methane with relatively low dryness coefficient ranging 0.45 to 0.82. The 5 13 C values for increase increasing number, which ranges -57.15%« -53.71%«. generally derived a mixed origin primary contribution thermogenic processes....

The geochemical characteristics of mantle degassing observed on the surface earth can indicate origin and migration path fluids. Compared with plate boundary tectonic environment, intraplate environment does not have a large number active volcanoes faults, observation volatiles in hot spring gas is relatively limited. We selected Sichuan–Yunnan block to discuss based carbon noble isotopes gases previous studies fault slip rate geophysical research. A total five samples (including two free...

Residual bitumen in organic-rich shale of oil windows exists widely, and its effect on the gas storage capacity could be two-fold. Bitumen occupy block nanopores shale, thereby reducing capacity. On other hand, dissolved reservoirs, leading to enhanced To quantify gas-in-place (GIP) estimation lacustrine micropore characteristics methane sorption original bitumen-free from Triassic Yangchang Formation Ordos Basin, combined with dissolution for isolated bitumen, were analyzed compared. GIP...

Mudstones are widely distributed in sedimentary basins with abundant nanopores and has very low fluid mobility. It is accepted that gas migration micro-nanochannels no longer follows Darcy's law the Hagen-Poiseuille equation molecular kinetic features profoundly influence micro-nanochannels. Here, we characterize nanochannel sizes of Longmaxi Shale cores under different overburden pressure pore conditions. And apparent permeabilities individual component gases (helium, nitrogen, methane)...

Two representative organic-rich mudstones from the Middle Permian (MP) and Upper Carboniferous (UC) around Fukang Depression in Junggar Basin were selected to study compare pyrolysis behavior kinetics. The MP UC described as type I II kerogen, respectively. FTIR XRD results revealed that contains carbonates different clay minerals compared UC. Peak deconvolution was used for delineate process better understand similarities differences kinetics of two mudstones. In addition, Coats-Redfern...