Мінеральні ресурси України (Mar 2024)
Factors and mechanisms of productive secondary reservoirs formation in deep-lying oil and gas complexes. Article 1. Tectonophysical mechanisms of Lower Carboniferous quartzite-sandstones decompaction in the central part of the Dniprovsko-Donetska depression at the depths of more than 4.5 km
Abstract
In the world, the scale of development of secondary reservoirs in decompaction rock bodies in a wide formation range is steadily increasing: from the crystalline basement of different ages of various oil and gas-bearing basins to terrigenous deposits with reduced primary porosity and carbonate formations. Development of hydrocarbon resources associated with secondary reservoirs of deep-seated complexes is the most important strategic direction of geological exploration. The results presented in this article are of fundamental importance, since they are based, firstly, mainly on the study of the core of deep-lying complexes, and secondly, on a significantly different (than in previous works) methodology (wide application of electron microscopic scanning with X-ray spectral probing and diffractometry), thirdly (and most importantly) – on a significantly different ideology. It is based on the concept of different genetic types of post-sedimentation transformations. Along with diagenesis and catagenesis, it is dislocation epigenesis and hypogene allogenesis with specific geodynamic and geothermodynamic regimes, including the special role of structural temperatures and pressures. In oil and gas-bearing basins of the continental-riftogenic (aulacogenic) type, the final stage of regional epigenesis is dislocation epigenesis with zonal and local manifestation of hypogene allogenesis. Gas and gas condensate deposits, as well as the main part of oil and heterophase deposits, are associated with this stage. The established regularities of the formation of secondary reservoirs are of particular importance for the effective development of the hydrocarbon potential of great depths.
Keywords
