Allocation of polymictic sandstones in a complex geological section of oil and gas wells of the Dnipro-Donetsk depression
DOI:
https://doi.org/10.31471/1993-9868-2022-1(37)-7-14Keywords:
reservoir rock, polymictic sandstone, parameter, gamma ray, neutron gamma ray, selection, geological section.Abstract
The division of the geological section into layers and the establishment of their lithotype is a mandatory step in the layer-by-layer interpretation of geophysical data. To implement this stage of interpretation, it is necessary to have a large amount of various geological and geophysical information about the studied geological section. One of the factors leading to the incorrect division of the geological section into layers and the establishment of their lithotype is the lack of geological and geophysical information. This is especially true for complex geological sections of the Dnieper-Donetsk Depression (DDD), which are filled with polymictic sandstones. One of the effective methods for identifying polymictic sandstone formations is gamma-spectrometric logging, which is not currently used in Ukraine. Therefore, the search for a simpler and more efficient way to identify polymictic sandstones with the involvement of a minimum amount of data is an urgent task today. In order to identify polymictic sandstones in a complex geological section, the authors of the work proposed to use the parameter Рpol, which shows the share of the contribution of the dispersed fraction of the rock and feldspars to the total water content of the rock compared to the reference reservoir. Pure polymictic sandstones serve as a reference formation. Parameter Рpol calculated based on the results of well logging using gamma-ray logging and neutron gamma-ray logging. The basis for the use of these methods to solve the problem in the work was the established relationship between the data of gamma ray logging and neutron gamma ray logging, which is explained by the same effect on their readings of the dispersed fraction and potassium-containing feldspars. The effectiveness and efficiency of the proposed method for diagnosing polymictic sandstones were confirmed by calculations on the actual material and comparison with the results of the description of thin sections.
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