Geological Structure of The Pre-Jurassic Complex Within The Elizarovsky Trough of The Frolov Megadepression and The Galyanovsky Nose of The Krasnoleninsky Arch According to Seismic Data CDP 3D

Summary The generation of terrigenous super reservoirs is not always determined by the primary sedimentation conditions and the quality of sand material; often reservoirs with good reservoir properties are formed during diagenetic changes in rocks. Reconstruction of diagenetic processes and superimposed changes in sedimentary material, leading, in the multimillion-year history, to the improvement of reservoir properties, is a very difficult task. The purpose of the study was to reconstruct the generation conditions of JV1 super-reservoir zone in the area of Accumulation 4 of Bakhilovsky mega-sewell.The following objectives were solved: 1) Define and describe the "super- reservoir" concept (lithological and petrophysical properties, well logging curves, effect of development). 2) Define sedimentation conditions, future super reservoirs, Upper Jurassic formation JV1(1-2) and JV1(3) at the Bakhilovskoye field. 3) Analyze the reasons for super reservoirs generatoin and effect on development. The tectonic activity of the territory predetermined the super-reservoir formation condition within the Vasyugan Formation of Bakhilovskoye Field. Deep faults created, on the one hand, favorable conditions for the accumulation of hydrocarbons, on the other hand, conditions leading to the destruction of accumulation by inter-reservoir fluid flows forming secondary oil and gas accumulations. Referens 1) Detailed GDE mapping of the Upper Jurassic within the Verkhnekolik-Egan and Bakhilovsky License Area, east of the Khanty-Mansi Autonomous District, 2009, Contract No. VNG-18-817/08/TNNC-3081/08, dated 11.02.2008,TNNC. 2) Nassonova, N.V., Romanchev, M.A., 2011, Geodynamic control of oil and gas content by shear faults in the east of West Siberia, Geology of Oil and Gas, Vol.4, p. 8-14