Aiming at Wilcox Formation in the Perdido fold belt of the Burgos Basin, Mexico, where double-layered salt rock structures are widely developed, this study explores the history of plate activity and the distribution of major river systems based on logging, core, thin-section and 3D seismic data under limited well control conditions. The provenance direction was determined by the seismic sedimentary filling structure and debris composition; the characteristics of the deepwater sedimentary system were analyzed based on the single well facies, seismic reflections and attributes. The provenance of the Wilcox Formation and the deep-water fan deposition system under its control were comprehensively analyzed, the correlation between source-to-sink elements was explored, and the coupling model was established. The results show that the provenance of Wilcox Formation is mainly from the western Rocky Mountains and is transported to the study area by the two major river systems of Rio Grand and Colorado, characterized by bidirectional provenance. Channelized lobe, proximal lobe and distal lobe are mainly developed in this area. Among them, the channelized lobe is characterized by coarser particles and better reservoir property, and is the most favorable sedimentary facies belt. The overburdened hugely-thick salt rock of Wilcox Formation has low density and high thermal conductivity, and thus can reduce formation temperature, slow down compaction and cementation, which is conducive to the preservation of primary pores in subsalt reservoirs. Extremely favorable conditions for deposition of deep-water fan in the Perdido fold belt are created by abundant sediment supply and an efficient shelf-transportation system. The source-to-sink model is represented by the Rocky Mountains-Rio Grand, Colorado drainage system-shelf edge delta-canyons-deep-water fan mode. In addition to the low degree of exploration, superior source conditions, and extensive sand body distribution in the Perdido fold belt, many favorable conditions are provided by the double-layered salt rock structure for oil and gas accumulation, presenting a broad exploration space and huge potential.

Liang, T., Zou, Y.-R., Zhan, Z.-W., Lin, X.-H., Shi, J., Peng, P.a., 2020. An evaluation of kerogen molecular structures during artificial maturation. Fuel 265, 116979.

http://www.sciencedirect.com/science/article/pii/S0016236119323725 13 C solid-state NMR and XPS techniques were used to investigate structural changes in kerogen during oil generation process across a range of maturity. Kerogen was isolated from an shale rock collected from Well W161 in the Dongying Depression, Bohai, China. An artificial pyrolysis experiment was carried out in a closed gold tube system using a heating rate of 2 ℃/h during which 11 temperature -point samples were collected between 350 ℃and 450 ℃(Easy%Ro = 0.80 to 1.98). The initial kerogen was analysed usi ng Rock-Eval and 13 the samples were analysed using X-ray photoelectron spectroscopy (XPS) and solid-state C nuclear magnetic 13 resonance ( C NMR) to study their functional groups and chemical structures. Six averaged molecular structure models of the initial kerogen and its residues (can not be dissolved by organic reagent) were established to study the changes occurring during oil and gas generation. The results showed that with an increase in temperature, the proportion of aliphatic carbon declined while aromatic carbon increased. After reaching peak oil maturity, a condensation reaction occurred in the residue; some aromatic carbons cracked from the kerogen and combined with the residue structure. Average aromatic cluster increment was calculated to quantify the increase in the size of aromatic clusters within the structures. It was established to evaluate the changes occurring in the molecular Con structure of type Ⅰ kerogen during heating. Based on these results, (maximum condensation degree) and U Con (lowest condensation degree) are proposed to estimate the degree of condensation of samples with L different maturities.

Liao, P.-H., Yang, H.-H., Wu, P.-C., Abu Bakar, N.H., Urban, P.L., 2020. On-line coupling of simultaneous distillation - extraction using the Likens - Nickerson apparatus with gas chromatography. Analytical Chemistry 92, 1228-1235.

https://doi.org/10.1021/acs.analchem.9b04380 Simultaneous distillation - extraction (SDE) using the Likens - Nickerson apparatus is a convenient technique used to isolate volatile organic compounds (VOCs) from complex liquid matrices. The technique combines steam distillation with solvent extraction. While analytical extractions are normally followed by off-line separation/detection, it is advantageous to couple extractions on-line with separation and detection systems that are employed in the same analytical workflow. Here, we have coupled the Likens - Nickerson apparatus on-line