Abstract
A case study of rock physics modeling and hydrocarbon seismic identification in heterogeneous carbonate reservoirs is presented in this chapter. The target work area, Metejan district, is located on the Chardzhui terraces in the Amu Darya depression. In this large sedimentary basin, a carbonate sedimentary sequence is developed in the lower Jurassic strata at the Callovian–Oxfordian Stage, constituting the main reservoirs. The workflow of rock physics modeling for carbonate rocks is developed in combination with the traditional seismic inversion techniques. Experimental analysis is performed to investigate the pore structure features of reservoir rocks, which includes CT scanning analysis, sample thin section analysis, and ultrasonic experimental measurements. The quantitative relationships between the wave responses of different frequency ranges and the basic lithological properties and pore fluids are predicted. Rock physics templates that are built based on thin section analysis of pore structures and seismic inversion of elastic parameters are applied to the limestone gas reservoirs from Metejan district. Based on poststack wave impedance and prestack elastic parameter inversions, the seismic data volume are used to quantitatively estimate rock porosity and gas saturation. The results of predictions are in good agreement with the production regime of the wells.
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