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C026 STOCHASTIC INVERSION OF OBC PZ DATA AT THE ELDFISK FIELD Abstract 1 The Eldfisk Field is a chalk reservoir located in the southern North Sea at about 3 km depth. Here chalk porosity is highly correlated to seismic acoustic impedance (AI). Given the reservoir lithology AI and likewise “seismic porosity” can be used to constrain the reservoir model away from well control. AI is also a layer property and is more closely linked to geology and geo-bodies than seismic reflection data which assist the interpretation process. Stochastic inversion subsequent to deterministic inversion was used among other reasons to preserve