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Features of geological structure heavy oil field complicated palaeovalley (P-N)

A.P. Bachkov, V.G. Bazarevskaya, D.V. Anoshin

Original article

DOI https://doi.org/10.18599/grs.2022.3.6

77-83
rus.

open access

Under a Creative Commons license
The geological study of reservoirs of heavy oil confined to the deposits of the Sheshma horizon, for further involvement of deposits in pilot production, is an expensive project in itself due to the high viscosity of oil from 200 to 200,000 MPa∙s and changes in the depth of the productive formation from 100 up to 500 m. It’s advisable to exclude all kinds of factors, including geological ones, leading to additional costs in the development of heavy oil deposits in an unstable economic situation.

The purpose is determining of impact palaeovalley on the efficiency of wells using the example of heavy oil deposits. For the analysis authors have applied, materials the estimation of reserves, laboratory researches and macro descriptions of the core, the results of structural and geomorphological studies, and development parameters.

It is viewed heavy oil deposits of the Sheshma horizon, complicated by palevalley, and geological structure. The porosity-permeability properties and characteristics of the bedding are given. The authors’re determined areas of palaeovalley the drilled wells, a macro description of the core and cuttings in the palaeovalley part are given. Zones of deconsolidation of the Upper Permian terrigenous deposits are identified by results of structural and geomorphological studies. A comparison of the map of predictive fracturing with the map of Pliocene formations characterizing the genesis of the palevalley is made. The authors’re comparisoned the operational capabilities of wells with the location of the wellhead in the palaeovalley zone and outside the palaeovalley. Recommendations for the design of horizontal wells complicated by palaeovalleys are determined.
 
Heavy oil, Sheshma horizon, geological structure, paleovalley (P-N), pilot development
 
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Albert P. Bachkov – Head of the Department of Geology and Development of Oil and Gas Fields, Tatneft PJSC
75, Lenin st., Almetyevsk, 423400, Russian Federation 
 
Venera G. Bazarevskaya – Cand. Sci. (Geology and Mineralogy), Deputy Director for Science in the Field of Geology of Hard-to-recover Reserves, Institute TatNIPIneft Tatneft PJSC
75, Lenin st., Almetyevsk, 423400, Russian Federation 
 
Dmitry V. Anoshin – Leading Specialist of the Project Office for Estimating Oil and Gas Reserves and Design Process Documentation, Institute TatNIPIneft Tatneft PJSC
75, Lenin st., Almetyevsk, 423400, Russian Federation
 

For citation:

Bachkov A.P., Bazarevskaya V.G., Anoshin D.V. (2022). Features of geological structure heavy oil field complicated palaeovalley (P-N). Georesursy = Georesources, 24(3), pp. 77–83. DOI: https://doi.org/10.18599/grs.2022.3.6