STOCHASTIC INVERSION FOR HIGHER RESOLUTION IN RESERVOIR CHARACTERIZATION, ABU MADI FORMATION, SALMA FIELD, NILE DELTA EGYPT

Document Type : Original Article

Authors

1 (1) Department Head of Geophysics, Wastani Petroleum Company,

2 (2) Exploration Consultant Geoscientist

3 (3) Geology Department, Faculty of Science, Helwan University, Cairo, Egypt

Abstract

The Nile Delta is one of the main hydrocarbon provinces in Egypt. It has already a lot of discovered hydrocarbon fields. The reserve calculation and the original oil and gas in place (STOIIP/GIIP) determination has been a problem. Abu Madi Formation is one of the main gas bearing formations in the Nile Delta. Salma Field has been producing gas from Abu Madi Formation for the Past seven years, in which the gas is present in two thin sand bodies separated by thick shale interval. By using conventional seismic techniques, it was found that both sand bodies are existing within the same seismic loop that made them undetectable. Deterministic inversion was applied and was not able to distinguish between both sand bodies. Stochastic inversion was tested in turn giving different results. A comparison is carried out between the deterministic and stochastic inversion results. The inverted Zp from stochastic inversion mean (P50) realization is found to be of more resolution than inverted Zp from deterministic inversion. Also, the inverted lambda-Mu from stochastic inversion has detected the thin reservoirs in well SD-5, in addition to the stratigraphic edge between SD-1 and SD-3 wells, as well as the separation between the two sand bodies in SDN-1 well. Where, the inverted lambda-Mu from deterministic inversion has failed to show neither the separation between the two sand bodies nor predict their stratigraphic edges in SDN-1 well.

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