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The Use of Multidisciplinary Approaches for Accurate and Detailed Study of Facies Distribution within the Field S

Nateganov, Artur A.1; Rozbaeva, Galina L.1
1 Limited Company "Tyumen Petroleum Research Center" (TNK-BP), Tyumen, Russia.

Filed S is located in the north of Krasnoyarsk region (north-east of the Western Siberia) under quite stern surface and climatic conditions that leads to its complicated exploration and development. Shallow marine sandstones of early Cretaceous age are characterized by fairly good oil rates (up to 300 cubic meters per day) during formation testing that is why operating company has intention to initialize development of this field quite soon. Even though the field was discovered more than 30 years ago it is still in stage of choice of an appropriate development plan because there is still appreciable degree of uncertainty associated with it and this fact makes us to review existing geological and geophysical interpretations and created geological models to optimize further development, and especially the pilot one which was started in 2008. The current work contains description of some multidisciplinary approaches for creation of a reliable facies model that is essentially the basis in terms of consequent petrophysical modeling and eventually reservoir simulation. Particularly, the following aspects are subsequently described: sedimentological description of available core and its depth-matching with well logs, identification of key surfaces in the core (maximum flooding surfaces, sequence boundaries and so forth) from the standpoint of sequence-stratigraphy and their correlation from well to well, interpretation of depositional environment with the aid of ichnofacies analysis in addition to conventional lithological and granulometric approaches combined with sedimentological textures analysis. On the other hand, 3D seismic data covering the whole area of research allowed us to distribute the results of well data interpretation into the inter-well space and correct (or in other words verify) the derived sedimentological and stratigraphic model of the field on the basis of seismic attributes analysis, interpretation of results of performed for these purposes via different algorithms post-stack seismic inversion, results of seismic facies analysis and seismic data classification on the basis of waveshape and attributes clustering into specific seismic classes delineating approximate reservoir geometry and particular depositional zones. In the authors’ opinion, described approaches and techniques made it possible to create more detailed and more reasonable facies model of the field S.

 

AAPG Search and Discovery Article #90090©2009 AAPG Annual Convention and Exhibition, Denver, Colorado, June 7-10, 2009