Abstract: Technique for prediction of dolomite fractured reservoir has been quite urgent for petroleum exploration and development in Biyang sag. Taking the dolomite fractured-vuggy reservoir in Biyang central deep sag area as an example, the key problem of low constraint inversion application to fractured-vuggy reservoir description is analyzed, and corresponding solutions are suggested. Starting with single well reservoir classification and correlation, the deposition model is firstly developed, and then detailed reservoir calibration, multiwell constraint seismic inversion and porosity constraint inversion are conducted, based on the well logs correction and the wavelet analysis. Finally, through detailed interpretation and composite analysis, such a reservoir's distribution scope is predicted, the porosity distribution features are delineated, by which the newly incremental control reserves of 991×104 t have been obtained in this area.

Key words: Biyang sag, dolomite, inversion, fracture, comprehensive interpretation