Mapping of fracture zones and small faults using VSP and Cross Dipole Sonic in Eastern Siberia Carbonate Reservoirs, Yurubchansky Field, Russia

Sergey Shevchenko; Sergei Tcherkashnev; Maxim Kuznetsov; Tagir Mamleef

doi:10.1071/ASEG2016ab246

25th International Conference and Exhibition – Interpreting the Past, Discovering the Future

ISSN: 2202-0586
E-ISSN:

oa Mapping of fracture zones and small faults using VSP and Cross Dipole Sonic in Eastern Siberia Carbonate Reservoirs, Yurubchansky Field, Russia
Authors Sergey Shevchenko^a, Sergei Tcherkashnev^b, Maxim Kuznetsov^c and Tagir Mamleef^d
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^a SIS Exploration Pty Ltd, 29 Harborne st, WA, , Perth, [email protected] ^b ASTO Geophysical Consulting Pty Ltd, 16 Ghost Gum Rd, WA, , Perth, [email protected] ^c Rosneft ESOGC Krasnoyarsk, , Russia, [email protected] ^d CJSC SPF G/TAS Oktabrsky, , Russia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2016, Issue 25th International Conference and Exhibition – Interpreting the Past, Discovering the Future, Dec 2016, p. 1 - 7
DOI: https://doi.org/10.1071/ASEG2016ab246
- Published online: 01 Dec 2016

Abstract

Zero offset VSP, two Walkaway lines, ultra sonic and cross dipole sonic were used to interpret fracture zones and small faults in the vicinity of a deviated well drilled through carbonate reservoirs of the Yurubchansky giant oil and gas field, Russia. The fractures and small faults are the main flow conduits and storage of the hydrocarbons within mainly low porosity carbonate reservoir of the Proterozoic age. The wells are only successful if they intersect these “sweet spots” in the reservoir. This is a challenge in developing the Yurubchansky field. The 3D seismic over the field has low resolution, strong heterogeneous reservoirs, varying degrees of anisotropy, multiples contamination and therefore cannot be used to map the “sweet spots” reliably.

An incoherency attribute was used to guide fracture and fault interpretation. Two major fault zones and small faults were interpreted from VSPs. One of the fault zones within the reservoir corresponds to fractured core, intensive fracture zones interpreted from the logs and hydrocarbon shows. This demonstrates the effectiveness of high resolution VSP data in mapping fractured zones. Other geological features including unconformity at the top of the reservoir were also interpreted from VSPs.

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References

Bauyk, I., Ruzkov, V., Determination of cracks and pores parameters in carbonates using cross dipole logging, Seismic Technology, N3, 32-42., 2010, Moscow.
Dobrynin, S., Stenin V., “Identification and Classification of Carbonate Reservoirs Using Cross Dipole Acoustic Log”,71th EAGE Conference & Exhibition, Amsterdam, Netherlands, 2009.
Kontorovich, A.E., 1994, Petroleum basins and regions of Siberia, volume 6, Baykit region : Novosibirsk, Russia, OIGGM SO RAN, 54p.
Kontorovich, A.E., Izosimova, A.N., Kontorovich, A.A., Khabarov, E.M., and Timoshina, I.I.D., 1996, Geologic framework and conditions of formation of the giant Yurubchen-Tokhom zone of oil and gas accumulation in the Upper Proterozoic of the Siberian craton: Geologia and Geofizika, v. 40, no. 8, p. 166-195.
Tcherkashnev, S., Shevchenko, S., Mamleev, T., Tabakov, A., Kim, V., Kuptsova, T., A report “VSP acquisition, processing and interpretation in the Yurubchansky Yur-90 prospecting well” Contract N° 3174314/0864^, 31.10.2014
Leaney, S., Tcherkashnev, S., Wheeler, M., Idrees, M., In-line walkaway VSP processing and integration, EAGE-2003, Moscow, SEG-2003, Houston
Morice, S., Robinson, M., Lounis, R., Leaney, S., Tcherkashnev S., Wheeler, M., A Complex Reservoir Revealed by Integrated 3D Seismic and VSP Acquisition and Processing, EAGE-2003, Moscow, EAGE-2004, Paris, “Galperinskie Chtenia”, Moscow, October 2005.
Ulmichek, G.F., 2001, Petroleum Geology and Resources of the Baykit High Province, East Siberia, Russia,U.S. Geological Survey Bulletin 2201-F

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Article Type: Research Article

Keyword(s): carbonates; field development; fractured reservoir; VSP

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