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Abstract

van Riel P., P. Mesdag, H. Debeye, and M. Sams, 2006, Full integration of seismic Previous HitdataNext Hit into geostatistical reservoir Previous HitmodelingNext Hit, in T. C. Coburn, J. M. Yarus, and R. L. Chambers, eds., Stochastic Previous HitmodelingNext Hit and geostatistics: Principles, Previous HitmethodsNext Hit, and case studies, volume II: AAPG Computer Applications in Geology 5, p. 207-218.

DOI:10.1306/1063817CA53236

Copyright copy2006 by The American Association of Petroleum Geologists.

Full Integration of Seismic Previous HitDataNext Hit into Geostatistical Reservoir Previous HitModelingNext Hit

P. van Riel,1 P. Mesdag,2 H. Debeye,3 M. Sams4

1Fugro-Jason Netherlands BV Leid Schendam, Netherlands
2Fugro-Jason Netherlands BV Leid Schendam, Netherlands
3Fugro-Jason Netherlands BV Leid Schendam, Netherlands
4Fugro-Jason Malaysia Sdn. Bhd. Kuala Lumpur, Malaysia

ABSTRACT

Seismic reflection amplitude Previous HitdataNext Hit are increasingly used in reservoir Previous HitmodelingNext Hit to provide information on changes in earth properties away from well locations. In geostatistical reservoir Previous HitmodelingNext Hit, the most common application is to use seismic Previous HitdataNext Hit as background Previous HitdataNext Hit in some form of comodeling. Seismic Previous HitdataNext Hit image reflectors and not earth layer properties. Therefore, prior to use in comodeling, seismic Previous HitdataNext Hit must first be transformed into an earth layer property. Typically, the transform is to acoustic impedance using an appropriate seismic Previous HitinversionNext Hit method.

Seismic Previous HitinversionNext Hit Previous HitmethodsNext Hit generate results that are generally band limited in nature, resulting in limits to vertical resolution. The vertical resolution achieved can be an order of magnitude below the vertical model resolution required from geostatistical reservoir Previous HitmodelingNext Hit, which is in the order of well-log resolution. Hence, in using seismic Previous HitdataNext Hit, geostatistical modelers encounter a problem of downscaling, not the more commonly encountered upscaling problem. This difference in scale introduces scatter between the primary Previous HitdataNext Hit with well-log order resolution and the secondary seismically derived rock property Previous HitdataNext Hit used in the comodeling. As a result, to preserve vertical heterogeneity, only limited use of the secondary Previous HitdataNext Hit can be made in comodeling procedures. This results in models that only partially fit the seismic Previous HitdataNext Hit, i.e., only limited use is made of the seismic information. If the secondary Previous HitdataNext Hit are more strongly imposed, the fit to the seismic Previous HitdataNext Hit improves, but the required vertical heterogeneity is not preserved. The inability to overcome this difference in scale issue, therefore, limits the value of the application of comodeling Previous HitmethodsNext Hit to integrate seismic Previous HitdataNext Hit into reservoir models.

One class of geostatistical Previous HitmethodsNext Hit that overcomes this limitation relies on iterative geostatistical Previous HitmodelingNext Hit. In these Previous HitmethodsNext Hit, referred to as geostatistical seismic Previous HitinversionNext Hit, the iterative Previous HitmodelingNext Hit process is conditioned such that the final models generated closely match the seismic Previous HitdataNext Hit while maintaining the required vertical heterogeneity. The application of these Previous HitmethodsNext Hit is computationally expensive relative to comodeling Previous HitmethodsNext Hit but is now practical for large models on today's desktop hardware. Relative to comodeling, geostatistical seismic Previous HitinversionNext Hit Previous HitmethodsNext Hit make full use of the information carried in the seismic Previous HitdataTop, resulting in a significant reduction in model uncertainty away from well control.

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