shale,favorable to the accumulation of shale gas. Comprehensive analysis shows that the geological conditions of the shale gas reservoir in the Shanxi Formation are general and difficult to develop. However,there are good prospects for shale gas in the layers and regions with fractures and associated properties.

Zhao, J., Wang, G., Chu, J., Zhuang, Y., 2019. Harnessing microbial metabolomics for industrial applications. World Journal of Microbiology and Biotechnology 36, 1.

https://doi.org/10.1007/s11274-019-2775-x Metabolome defines a set of metabolites present in a biological sample, which provides an immediate and dynamic recording of microbes in response to genetic and/or environmental perturbations. In recent years, metabolomics in combination with other omics diagnostic tools such as genomics, transcriptomics and proteomics is focused on addressing open biological questions that accelerate our understanding of the system as a whole and boost the use of systems metabolic engineering tools in industrial settings. In this review article, we summarize the applications of metabolomics to industrial microbial fermentations with respect to the bulk production of organic acids, amino acids, enzymes, antibiotics and therapeutic proteins. In addition, future prospects regarding metabolomics-assisted research are provided.

Zhao, P., Fu, J., Shi, Y., Li, G., Ostadhassan, M., Luo, M., Mao, Z., 2020. Hydrocarbon saturation in shale oil reservoirs by inversion of dielectric dispersion logs. Fuel 266, 116934.

http://www.sciencedirect.com/science/article/pii/S0016236119323270 Hydrocarbon saturation is an important petrophysical parameter in reservoir evaluation and reserve calculation. Dielectric dispersion logs have been widely used to estimate the hydrocarbon saturation, especially in high salinity shale formations. However, there is still room to improve the accuracy of interpretation of dielectric dispersion logs. In this paper, we used two interpretation models combined four dielectric permittivity and four conductivity logs measured by Array Dielectric Tool (ADT) at four frequencies to predict the hydrocarbon saturation in shale oil reservoirs, Triassic Yanchang Formation, Ordos Basin, China. The logs measured at the highest frequency are interpreted by the Complex Refractive Index (CRIM) model. And the other three frequencies measured logs are processed by the shaly sandstone (SHSD) model. Based on the two models, simulated annealing algorithm is selected to calculate water saturation and rock textual parameter, the dispersive phase fraction, and water salinity. Besides, accurate porosity, dielectric permittivity of rock matrix, and temperature are input information to the proposed method. The proposed method is applied to shale oil reservoirs of Triassic Yanchang Formation in two wells. The effectiveness and reliability of proposed model is verified by synthetic log responses. The mean relative error between synthetic and field logs is small. The predicted hydrocarbon saturation is consistent with core data, and its variation is consistent with characteristics of NMR T2 distributions, verifying the accuracy and reliability of proposed method and inversion results. Our estimated hydrocarbon saturation of the two wells is about 30%, showing a good oil generation potential of the studied shale oil reservoirs.

Zhao, Q., Guo, L., Wang, Y., Jin, H., Chen, L., Huang, Z., 2020. Enhanced oil recovery and in situ upgrading of heavy oil by supercritical water injection. Energy &Fuels 34, 360-367.

https://doi.org/10.1021/acs.energyfuels.9b03946 Heavy oil accounts for two-thirds of the world oil resources but contributes only one-seventh of the world oil production due to its high oil viscosity and heavy distillates. Steam injection has been widely used for heavy oil recovery by heating up the reservoir to reduce oil viscosity. However, severe carbon loss to coking causes low recovery efficiency and high energy consumption. Here, we report supercritical water injection for heavy oil recovery. Supercritical water is expected to be both a heat carrier and an organic solvent, thereby not only reducing oil viscosity but also dissolving heavy distillates to avoid coking. To test its feasibility, core experiments were first conducted to simulate the recovery process. Results showed that supercritical water flooding improved oil recovery by 17% and reduced heat consumption by 34% versus classsical steam flooding.