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van Riel P., P. Mesdag, H. Debeye, and M. Sams, 2006, Full integration of Previous HitseismicNext Hit Previous HitdataNext Hit into geostatistical reservoir modeling, in T. C. Coburn, J. M. Yarus, and R. L. Chambers, eds., Stochastic modeling and geostatistics: Principles, methods, 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 Previous HitSeismicNext Hit Previous HitDataNext Hit into Geostatistical Reservoir Modeling

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

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

Previous HitSeismicNext Hit Previous HitinversionNext Hit methods 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 Previous HitfromNext Hit geostatistical reservoir modeling, which is in the order of well-log resolution. Hence, in using Previous HitseismicNext Hit 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 Previous HitseismicNext Hit Previous HitdataNext Hit, i.e., only limited use is made of the Previous HitseismicNext Hit information. If the secondary Previous HitdataNext Hit are more strongly imposed, the fit to the Previous HitseismicNext Hit 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 methods to integrate Previous HitseismicNext Hit Previous HitdataNext Hit into reservoir models.

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

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