RESERVOIR ARCHITECTURE OF THE ABADI FIELD

摘要

Construction of 3D geological models (static geo-cellular models) is essential in understanding the distribution and volumetric uncertainty of the reservoir in the Abadi field. This study is aimed at providing the most likely interpretation for the stratigraphy and depositional facies distribution to be used in a 3D geological model.The methods applied in this study are 1) stratigraphic well log correlation, 2) depositional facies interpretation, 3) integration of stratigraphic correlations and depositional facies into a single sequence stratigraphic model.The stratigraphic well correlation was carried out based on palynological age zoning. Gamma ray log motifs, lithological boundary characteristics from conventional core and borehole image logs were also utilized to constrain the correlations. The reservoir was subdivided into eight stratigraphic zones from the top to the bottom, namely, Zones A1, A2, B, C, D1, D2, E1 and E2. Zones A2 and D1/D2 represent two major sandy zones.Utilizing the sedimentological core descriptions and the borehole image log interpretation, we classified depositional facies into seven groups. The facies logs suggest repeated successions of offshore to shoreface facies occasionally accompanied by minor marine embayment and tidal inlet channel facies.The stratigraphic well correlation and the facies study were integrated into a sequence stratigraphic framework to determine facies layers, classify reservoir properties and set parameters for the facies anisotropy range in the 3D geological model.