Post-sedimentation changes in carbonate rocks of the Lower-Middle-Carboniferous oil and gas complex in the south-east of the Samara region
UDC: 553.98(470.4/.5)
DOI: -
Authors:
RAKHIMOVA E.V.
1,2
1 Sergo Ordzhonikidze Russian State University for Geological Prospecting, Moscow, Russia
2 IPNE LLC, Moscow, Russia
Keywords: carbonate rocks, post-sedimentation changes, reservoir properties, Oka upland, Bashkir tier
Annotation:
The author of the article identifies and substantiates the cause-effect relationship between the structure of carbonate rocks and characteristics in the Lower-Middle-Carboniferous carbonate oil and gas complex in the south of the Volga-Ural oil- and gas-bearing province, which is one of the main as per hydrocarbon potential. That’s why the study of the sediments composing the complex is of great practical importance. The above-mentioned specified complex covers the interval from the Aleksinskiy horizon of the Viseian tier of the carboniferous system lower section up to the Bashkir tier of the carboniferous system middle section. In the process of microscopic examination, sedimentation and post-sedimentation structural components of carbonate rocks were revealed, on the basis of which 52 lithological types of rocks were identified and their structural-genetic classification was proposed. Petrographic study of the complex carbonates revealed a number of specific features that make it possible to distinguish sedimentation and post-sedimentation structures of rocks. The stage analysis allowed fixing the stages of transformation during dolomitization and recrystallization, being the main secondary processes that change the rock. Reservoir properties analysis proved their relationship with the selected structural varieties of carbonate rocks. Thus, the author of the article summarizes her work on studying the rocks of the complex by microscopic methods, petrophysical core studies followed by results processing.
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