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ABSTRACT: Hydrocarbons Generation by the Artificial Confined Pyrolysis of Coals from Sabinas-Piedras Negras (Mexico) and Donets (Ukraine) Basins

Confined pyrolysis was carried out inside gold cells under a pressure of 700 bars at different temperatures (330°C, 360°C and 400°C) and for different periods of time (24h, 120h and 720h) on bituminous coals of distinct coal rank (R r =0.9% and 0.6%, respectively) from two coal basins: Sabinas-Piedras Negras (Mexico, Cretaceous age) and Donets (Ukraine, Carboniferous age). The aim of this research was to follow the behavior and evolution of pyrobitumen during the phases of generation, migration and secondary cracking of bitumen. This study forms part of broader research aimed at estimating the level of hydrocarbon production and predicting the generation of oil and gas under variable geological conditions in sedimentary basins. The composition of generated bitumen and the type of pyrolysis system used (confined, hydrous, and open) may influence the physico-chemical characteristics of coal and neo-formed pyrobitumen during the phase of generation and hydrocarbon migration. Thus our heating experiments were accompanied by geochemical (Rock Eval and molecular analyses) and petrographic examinations in order to clarify the transformations undergone by the coal, (e.g. the evolution of the coal matrix and optical textures, the transformation of the most hydrogenated coal macerals and