Abstract:

Igneous reservoirs feature in complexities of lithologies and lithofacies and strong heterogeneity.This paper analyzed the petrophysical characters,log responses,and oil-water system of reservoirs with different lithofacies and reservoir types,and proposed a unit division method suitable for reserve calculation of igneous reservoirs.Effective reservoir thickness is recognized through analyzing core,FMI and NMR log data.Models for porosity and saturation interpretation are established through subdivision of reservoir types and integration of conventional log,NMR,and intrusive mercury curve.Parameters of the reserve calculation units are described quantitatively through log-constrained seismic inversion.A comprehensive application of the above-mentioned methods and technologies would solve successfully such issues as difficulties in interpreting reserve parameters of fractured-vuggy igneous reservoirs with dual media and the inaccuracy of reserve calculation.Furthermore,it may help the evaluation of reserve calculation of similar igneous reservoirs.

Key words: reservoir identification, reserve parameter evaluation, igneous rock