Porosity prediction from seismic inversion, Lavrans Field, Halten Terrace, Norway
| Autor: | Ingrid Magnus, Bengt K. Pedersen, Tore Håkon Hanssen, Girish Saigal, Jan Helgesen, David M. Dolberg |
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| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | The Leading Edge. 19:392-399 |
| ISSN: | 1938-3789 1070-485X |
| DOI: | 10.1190/1.1438618 |
| Popis: | Several authors have changed employment since this paper was written. Those authors and their new locations are: David Dolberg, Mobil Oil Canada, Calgary, Alberta, Canada; Jan Helgesen, CGG Norge, Hovik, Norway; Tore Hakon Hanssen, Fortum Petroleum, Oslo, Norway; Ingrid Magnus, Norsk Hydro ASA, Bergen, Norway; Girish Saigal, Norsk Hydro ASA, Oslo, Norway; and Bengt K. Pedersen, Norwegian University of Science and Technology, Trondheim, Norway. Lavrans Field lies offshore Norway on the western extreme of Halten Terrace, 15 km south of Smorbukk Field (Figure 1). Exploration in this area has been extremely active, yielding two large gas and condensate discoveries within Petroleum License 199—Lavrans Field to the east and Kristin Field to the west. Combined reserves are approximately 1200 million barrels oil equivalent of gas and condensate. Unique conditions have come together to provide hydrocarbons and preserved porosity at depths greater than 5 km. Figure 1. Lavrans and Kristin fields relative to Smor-bukk. Field outlines (rose) are drawn on the map of the Base Cretaceous Unconformity. View is to the north. Hydrocarbon-bearing sandstones at Lavrans have a thickness of 600 m. These reservoirs consist of shallow-marine deposits of Jurassic age. Although the facies can be laterally extensive, the overprint of diagenesis makes prediction of reservoir quality difficult. Seismic inversion provides insight to porosity variations away from limited well control. Thus, seismic inversion can be a valuable tool for reservoir characterization prior to field development. This study developed out of a need to better understand the significance of seismic amplitude variations over the crest of Lavrans Field (Figure 2). Hypotheses examined to explain amplitude variations were fluid effects, porosity, pressure changes, or processing and illumination artifacts. Figure 2. Cross-line 3185 is a dip line through well 6406/2-2. Seismic anomalies are seen below the Top Ile Formation. Understanding the meaning of these amplitudes was a primary motivation … |
| Databáze: | OpenAIRE |
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