low production shales therefore tend to be both compressed and closed, with low surface porosity and of round shape. The total pore volume and specific surface area of silica-rich low production shales are 34.63% and 22.0% lower than that of the silica-rich high production shales. This indicates that tectonic movement has a significant influence on the shale pore volume, while specific surface area has a smaller influence.

Xue, P., Zhang, L., Liang, Q., Sun, X., Zhao, Q., Qi, P., 2019. Thermodynamic characteristics of CH adsorption by 4 continental shale: A case study of the Upper Triassic Yanchang Shale in the Yanchang Gasfield, Ordos Basin. Natural Gas Industry 39, 64-73.

http://oversea.cnki.net/kcms/detail/detail.aspx?dbCode=cjfd&QueryID=14&CurRec=15&filename=TRQG2019 11015&dbname=CJFDLAST2019 In Chinese. In order to improve the calculation method of the isosteric adsorption heat, clarify thermodynamic characteristics of CH adsorption by continental shale and reveal the adsorption mechanism, this paper selected 4 shale samples from the seventh Member of Yanchang Formation of Upper Triassic in the Yanchang Gasfield of the Ordos Basin as the research object. The isothermal adsorption experiment was carried out on the CH 4 adsorption by continental shale and the excess adsorption curves were plotted. Then, the characteristics of the isosteric adsorption heat of the shale with different types of adsorption capacity were illustrated by analyzing and comparing the difference between excess and absolute adsorption capacity. And the following research results were obtained. First, under the same temperature and pressure, absolute adsorption capacity is higher than the excess values. The difference between them is higher under low temperature and high pressure and it is in the relationship of exponential function with the equilibrium pressure. If excess adsorption capacity is used to evaluate the adsorptive property of shale reservoirs, the evaluation result will be underestimated. Second, for CH adsorption by Yanchang Formation shale, the absolute and excess isosteric adsorption heat values have a 4 linear positive correlation with absolute and excess adsorption capacity respectively, and the intermolecular force of adsorbate has a dominant effect on isosteric adsorption heat values. Third, absolute isosteric adsorption heat value is less than the excess heat. The relative error is in the range of 18.18 - 49.79%, and it is higher in the stage with low adsorption capacity. If excess adsorption capacity is taken as the basic data to calculate initial isosteric adsorption heat values, the calculation result will overvalued, and consequently the evaluation on the intermolecular force of adsorbent and adsorbate is overestimated.

Yakubova, S.G., Abilova, G.R., Tazeeva, E.G., Borisova, Y.Y., Milordov, D.V., Mironov, N.A., Yakubov, M.R., 2019. Distribution of vanadium and nickel in the case of two-step solvent fractionation of asphaltenes of heavy oils. Petroleum Chemistry 59, S30-S36.

https://doi.org/10.1134/S0965544119130140 General features of the distribution of vanadium and nickel in the products of two-step solvent fractionation of asphaltenes have been using the exampley of heavy crude oils from various fields of the Volga - Urals oil-and- gas basin (Russia). At the first step, during the treatment of a solution of asphaltenes in toluene with an excess of n-hexane, vanadium and nickel are predominantly concentrated in the insoluble fraction that is characterized by increased molecular weight, aromaticity, and degree of condensation with a decreased fraction of heteroatomic sulfur- and oxygen-containing structures. At the second step, during the treatment of the solution of asphaltene fractions in toluene with an excess of dimethylformamide, characteristic features of the distribution of vanadium and nickel in the obtained fractions have been revealed for heavy oils from different fields. As a result, differences in the concentration of metal complexes of vanadyl with asphaltenes have been determined for the heavy oils from Carboniferous and Permian productive sediments.

Yamada, Y., Guillemette, R., Baudoux, A.-C., Patel, N., Azam, F., 2020. Viral attachment to biotic and abiotic surfaces in seawater. Applied and Environmental Microbiology 86, e01687-19.

http://aem.asm.org/content/86/3/e01687-19.abstract