Petrophysical model of the Parphenovsky horizon caprock: a case study of the Kovykta field
https://doi.org/10.21285/2686-9993-2019-42-4-476-486
Abstract
The purpose of the study has been to build a petrophysical model of the Kovykta field caprock based on the analysis of the relationship between its petrophysical parameters (natural radioactivity, velocity, specific electric resistance) and lithological characteristics. The geological structure survey and stratigraphic boundary referencing have been conducted for the Parphenovsky horizon on the section crossing the Kovykta field from south-east to north-west. The composition and porosity analysis for the main rock types of the Parphenovsky horizon has been conducted on 47 samples taken in the Kovykta wells 1, 2, 4, 13, and 24. Based on the well-logging data and the laboratory studies of the core, a statistical analysis of the radioactive, electrical and acoustic properties of the Parphenovsky gas horizon caprock has been conducted. The study has shown a sufficiently reliable stochastic relationship between the lithological composition of the horizon caprock on the one hand, and the natural radioactivity parameters, electrical resistivity and the layer velocity on the other hand. The differences detected in the physical parameter distribution for the central and Khandinsky sections indicate that the horizon’s caprock formation on these sections took place in different facies environment. In this connection, the sections should be considered as two structurally independent tectonic blocks with different capacity and petrophysical characteristics.
About the Authors
T. S. Mamakova
“Irkutsk Geophysical Division”, JSC “Rosgeologia”
Russian Federation
Russian Federation
Head of the Well Logging Department
9a Klara Tsetkin St., Irkutsk 664039, Russia
D. O. Mamakov
“Irkutsk Geophysical Division”, JSC “Rosgeologia”
Russian Federation
Russian Federation
Deputy Director
9a Klara Tsetkin St., Irkutsk 664039, Russia
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Review
For citations:
Mamakova T.S., Mamakov D.O. Petrophysical model of the Parphenovsky horizon caprock: a case study of the Kovykta field. Earth sciences and subsoil use. 2019;42(4):476-486. (In Russ.) https://doi.org/10.21285/2686-9993-2019-42-4-476-486
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