GEOPHYSICAL RESPONSE OF THE LIUHUA CARBONATE PLATFORM IN NORTHERN SOUTH CHINA SEA

The complexity of carbonate deposition and diagenesis leads to the carbonate reservoir heterogeneity. The analysis of the intersections of well logs in the area of the Liuhua oil field on Dongsha massif suggest that velocity, density and seismic acoustic impedance are the most relevant physical parameters of porosity. Based on the quantitative analysis of reservoir physical properties from 3d seismic and logging data, we summarized in this paper the heterogeneous characteristics of the reef carbonate platform, and described its physical properties, by using the techniques of seismic inversion and attributes analysis. The results show that the seismic reflection, acoustic impedance inversion, seismic amplitude attributes, and coherence can be used in description of carbonate reservoir characteristics. Finally, we analyzed the genesis of the heterogeneity of reservoir of the Lliuhua oil field. It is concluded that the karst and sinkhole caused by acid gas are one of the main reasons for the heterogeneity of a reservoir.