Comprehensive Identification Technology of Atypical Bright Spot Oil Reservoirs in Deep Water Area of Eastern South China Sea

Abstract

A series of light oil fields which are characterized by shallow burial, good physical property have been discovered through latest exploration in Baiyun Depression of Pearl River Mouth Basin. However light oil reservoir is "Atypical bright spot" reservoir. The light oil-bearing and gas bearing structures in the seismic section are characterized by "bright spot" reflection, and the difference of elastic parameters is not obvious. Traditional methods are inefficient to discriminate oil, gas and water. Aiming at the above problems, the fluid rock physical interpretation version is rebuilt through the analysis of Gassmann fluid factor based on two-phase medium petrophysics theory and the elastic parameters of the P-wave impedance. Then the three fluid properties of oil, gas and water are classified by direct inversion technique based on elastic impedance. The real data processing and exploration practice have proved the feasibility and validity of this method which is instructive to deep water exploration.