METHOD OF DETECTING AND MAPPING FLUID-SATURATED ANISOTROPIC CAVERNOUS-FRACTURE RESERVOIRS IN INTER-SALT CARBONATE FORMATIONS OF A SEDIMENTARY COVER

摘要

FIELD: geophysics.;SUBSTANCE: invention relates to the field of seismic exploration and can be used for mapping of complex fluid-saturated fractured-cavernous zones, with AHPP of fluids in geologic section of sedimentary cover of platforms and areas of their connection with marginal troughs. During excitation and registration of seismic signal of CDPM, data are processed with maximum attenuation of interference and ensuring preservation of primary seismic field, with separation of scattered component. Besides, energy and spectral characteristics, as well as degree of irregularity of scattered component seismic signals are determined. According to abnormal values of said parameters, fracture-cavernous zones with different degree of fracturing and cavernousness are selected. Inter-salt fluid-saturated reservoirs are a special prediction object, the geological structure of which is fundamentally different from massive fracture reservoirs, and is therefore characterized by special effects of reflection and recording in the wave field.;EFFECT: improving reliability of prediction of complex fluid-saturated fractured-cavernous zones, with abnormally high bed pressure of fluids in halogen-carbonate sequences of geological section of sedimentary cover of platforms and areas of their connection with marginal troughs, which complicate drilling at different stages and stages of geological prospecting process.;1 cl, 6 dwg