Geological structure and oil-and-gas occurrence of Prorva group of the Southern deposits of the Caspian Depression in terms of geophysical information

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Authors:


Madiyar Aliakbar, orcid.org/0000-0001-5913-4490, Satbayev University, Almaty, the Republic of Kazakhstan

Sara Istekova, orcid.org/0000-0003-4298-7598, Satbayev University, Almaty, the Republic of Kazakhstan

Kuanysh Togizov*, orcid.org/0000-0002-4830-405X, Satbayev University, Almaty, the Republic of Kazakhstan

Raushan Temirkhanova, orcid.org/0000-0001-8219-0589, Satbayev University, Almaty, the Republic of Kazakhstan

* Corresponding author e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.


повний текст / full article



Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2023, (3): 011 - 019

https://doi.org/10.33271/nvngu/2023-3/011



Abstract:



Purpose. Purpose is to generalize and analyze the currently accumulated geological and physical as well as field data to study productive strata of Prorva group of oil-and-gas occurrence of the Southern deposits of the Caspian Depression in Kazakhstan.


Methodology. Deep Triassic rock systems were studied thoroughly relying upon the explained new data by seismic data together with logging and field information using current processing and interpretative systems according to the newly drilled deep wells within the unexplored northwest part of the structure.


Findings. The specified geological model of the field has been obtained. Twenty-one estimation targets have been singled out in the Jurassic-Trias structures; three new oil-and-gas-bearing formations have been identified as part of the Lower Cretaceous share of a productive stratum within the Valanginian level. According to geophysical analysis, Western Prorva and S. Nurzhanov deposits are the unified system with the oil-water contact level.


Originality. Selection of the recommended location of the new wells is based upon specificity of the innovative scientific and technical approaches while studying regularities of facies substitution of reservoir rocks with enclosing systems of each productive stratum; and studying permeability and porosity of the reservoir rocks as well as fluids saturating them.


Practical value. The obtained data have become the basis to assess the remaining carbohydrate reserves, and identify new opportunities increasing the reserves within the Western area of S. Nurzhanov deposit; moreover, they raise a question on the expediency to develop the Unified Project of the field mining.



Keywords: the Caspian Depression, deposit, oil-and-gas occurrence, seismic prospecting, logging, productive stratum, assessment of reserves

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