Based on detailed analyses of seismic and well data, the Statfjord Field, northern North Sea, can be separated into a relatively undeformed main field area and an east flank heavily deformed by rotational block slides. The main tectonic event is related to the opening of the Viking Graben which started in the middle Jurassic and which increasingly affected deposition of the Bathonian-Oxfordian Heather Formation. This rift phase peaked before the deposition of the Draupne Formation causing gravitational instabilities along the crest of the field and subsequent rotational block slides in the Upper Triassic and Jurassic sections. Compared to fields closer to the graben centre only limited erosion affected the Statfjord Field reservoirs during the Oxfordian-Ryazanian. Here, the Draupne Formation still drapes a partly degraded Jurassic sequence and is thickest on the west flank and within topographic depressions on the east flank. Minor tectonic activity occurred during the Cretaceous and Tertiary.
Copyr@ 1296, Olfshom Technobgy G&!rence lhi~PSPW was PI@s01710dat the 28th AnrIud OTC INIHCIU$lCWI,Tox8s.U.S A., 6.9 May 1S96 l%,s pSpEI ws SW.3ed for presentauon Dy Ihe OTC P[W8m C0Mmt19e fol!own!g WJWU Of Infammtlca crmlarwd HI m abstract Submmea by the authcf$. C4mlenfs 01 the paper, m presented, have not M rewmved by the Oflsiwre Technobgy Con forenca and are subIac4 lo correction by the authors The material. as pmsanted does not necasmrily rdecl any posrtion of ma Oifshore Technology Caifemnce or M olfuars. Permlss@x m WY IS restrtied to an abstra.a 01 not mom than 200 wads. Itlustratcm may not bm rxwmd. The aburgcl should umtam con$PIcwus knowk%d d whera and by tiun tfM wwr was preaenwd AbstractThe current position within appraisal and production reservoir model Iing is reviewed with respect to the data input, work processes and overall philosophy necessaty to achieve optimal, economic hydrocarbon recovery. Modern applications of 3D seismic and time lapse (4D) seismic are making increasingly significant contributions to the generation and verification of dynamic reservoir models incorporating the required levels of geological realism. Reference is made to examples from the North Sea and Norwegian Shelf to illustrate how these seismic data are being used to optimise structural and stratigraphic mapping, rock property mapping, identification of reservoir heterogeneities and the determination of fluid distributions with time. However, due to the uncertainties involved in data acquisition and processing and the inherent subsurface complexity caution should always be exercised when applying the results of seismic studies. This to avoid invalidating the model being constructed. The potential for the seismic conditioning of stochastic geological models and the use of marine shear wave data is also considered.
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