استفاده از رخساره هاي لرزه اي در توصيف يكي از مخازن نفتي ايران

Seismic Facies Analysis of an Iranian carbonate oil reservoir

Seismic Facies Analysis (SFAj is a powerful technique to define the variations of the seismic character of traces at reservoir level, in connection with possible variations of reservoir property which is essential for estimating reserves and planning production operations. In this study we try to integrate 3D seismic data and effective porosity logs to predict lateral variations of porosity in Mishrif reservoir (A common oil reservoir in Persian Gulf). Both supervised and unsupervised seismic facies analyses have been performed at reservoir level. The results are convergent and consistent with petrophysical well data as well as predicted mean porosity map from previous study, and allow defining areas with low and high mean porosity values. The unsupervised analysis not only confirms the results of the supervised method but also gives more detailed lateral distribution of the seismic facies. The areas with low mean porosity values are mainly located in the southern part of the study area, while the areas with high mean porosity values are locate-d in the northern part with an extension to the west of the study area.