Integrated reservoir characterization of Kailashtila gas field

Abstract

An integrated reservoir characterization technique is used to integrate the geological, engineering and reservoir performance data to describe the reservoir and to develop an appropriate reservoir management plan. This study has developed an approach using geological and engineering data to characterize the hydraulic flow unit. It has tabulated reservoir characteristics for each hydraulic flow unit and reevaluated the reserves for each gas sands in the field. A new correlation was developed following Amaefule et.al approach. This new relationship includes the effect of shale volume, Vsh as a parameter in the porosity permeability correlation for shaly sand reservoir. This will overcome the limitation of identifying the hydraulic flow unit of pure sandstone by the present method. The new formula is capable of accommodating shaly sand as well. This thesis evaluated reservoir performance potential of Kailashtila Gas Field located at Sylhet, Bangladesh using the production history; well test data, core data and openhole well log data. At first, hydraulic flow units were delineated using the core data and openhole well log data. Then, reservoir parameters like permeability, porosity, skin factor, average reservoir pressure and absolute open flow potential (AOFP) were estimated by analyzing well test data. The values of these parameters were compared with the parameters obtained from core and well log analysis as well as previous study results. Identifying the aquifer type and its effect on gas production is also a major concern of this study. Finally, updating Gas Initially In-Place, optimizing field production and prediction of reservoir future performance were done.