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Combined Approach Improves Fault Description for Horizontal-Well Geosteering

This paper presents an interdisciplinary approach to the description of tectonic dislocations made on the basis of interpretation of seismic data, petrophysical analysis of well-logging data in horizontal wells, and inversion of a multifrequency propagation tool. A consistent approach to fault identification and description is presented on the basis of seismic surveys and logging-while-drilling (LWD) data in horizontal wells in a western Siberian oil field.

Seismic Methods of Tectonic-Fault Interpretation

Estimation of seismic methods of fault detection was performed on materials acquired from one of the fields in the Frolov oil-and-gas district. The observed territory of the oil field is characterized by complex geological structure—namely low effective reservoir thickness, thin layering of sandstones and silts, low porosity, low-permeability reservoir zones, and tectonic block structure.

When drilling in reservoirs of low thickness, knowing the precise position of the horizontal wellbore relative to the structure is critical. The basis of drilling planning is a structural map of the reservoir top. After field jobs were complete and the results of the wide-aperture 3D seismic survey of the considerable refinement of the top structure of the reservoir were obtained, the morphology of all earlier identified structural forms was completed. A faulted and blocked principal model of the reservoir was created that formed the basis for a well-pad positioning scheme, as well as for usage in horizontal-well drilling.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 191695-18RPTC, “Complex Approach to Fault Description While Geosteering for Maximization of Reservoir Contact in Horizontal Wells in West Siberia Oil Fields,” by Vladislav V. Krutko, Tatyana A. Yurkina, SPE, and Dmitriy Y. Kushnir, Baker Hughes, a GE Company, and Valery B. Karpov, RITEK, prepared for the 2018 SPE Russian Petroleum Technology Conference, Moscow, 15–17 October. The paper has not been peer reviewed.
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Combined Approach Improves Fault Description for Horizontal-Well Geosteering

01 January 2019

Volume: 71 | Issue: 1

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