Abstract
The processes of the second mineral formation (kaolinite, carbonates and micas) were identified during the post-sedimentation transformation studies in oil\\gas deposits. Besides, quartz regeneration, solid product destructive formation processes and hydrocarbon oxidation processes were -determined. Correlation analysis of the mineralogy and petrophysics data revealed the post-sedimentation influence factors on the reservoir properties of deposits. It should be noted that the second kaolinite composition increase results in water saturation and density decrease, porosity and, especially, permeability increase. Quartz regeneration and second mica formation deteriorate the reservoir properties or poorly influence them. The hydrocarbon decay and oxidation products, as well as secondary carbonate seal the void space, replace the soluble rock debris and sharply deteriorate the reservoir properties of oil andgas deposits.
Highlights
Nowadays, oil and gas–bearing forecast provides necessary knowledge on hydrocarbon accumulation mechanisms, concepts of sedimentary rocks formation and transformation, especially organic geochemistry, post-sedimentary reservoir and cap rocks alterations for enhanced oil recovery and deposit identification [1,2,3,4]
To understand the processes related to the formation of reservoir properties in hydrocarbon accumulation zones we should determine and specify the geophysical techniques data with the help of mineralogy-petrography and other analyses [5]
The mineralogy-petrographic research results were based on transparent, polished sections (302), laboratory data of open porosity, permeability, water saturation, rock density identification, as well as X-ray analysis
Summary
Oil and gas–bearing forecast provides necessary knowledge on hydrocarbon accumulation mechanisms, concepts of sedimentary rocks formation and transformation, especially organic geochemistry, post-sedimentary reservoir and cap rocks alterations for enhanced oil recovery and deposit identification [1,2,3,4]. Area is inclined towards the western border of Southern Hudoseysk rift zone, which is characterized as a linear tectonic structure via gravimetric and seismic data [7] This indicates the fact of existing dislocation processes (permeable zones) within the investigated area and possible abyssal fluid penetration into Jurassic-Cretaceous sediments. These sediments were subjected to the following alterations: diagenetic, katagenetic, metagenetic during sedimentation and evolution in the process of sedimentary basin subsidence (phased epigenesis), as well as dislocation-metasomatic [2] transformations associated to fluid migration and oil and gas-bearing formation processes during the areal inversion development. Under favorable conditions the zones of secondary highly-porous rocks with integrated-void spaces are formed
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