TABLE OF CONTENTS The tasks associated with basic reservoir analyses provide information that is needed to prepare input data for a simulation study. These tasks include volumetric analysis, material balance analysis, and decline curve analysis. In addition to providing estimates of fluids in place and forecasts of fieldwide production, they also provide an initial concept of the reservoir which can be used to design a model study. Each of these tasks is outlined below.
Fluid volumes in a reservoir are values that can be obtained from a variety of sources, and therefore serve as a quality control point at the interface between disciplines. Volumetric analysis is used to determine volume from static information [see, for example, Tearpock, et al. 2002; Dake, 2001; Towler, 2002; Walsh and Lake, 2003; Craft, et al., 1991; Mian, 1992]. Static information is information that is relatively constant with respect to time, such as reservoir volume and original saturation and pressure distributions. By contrast, dynamic information such as pressure changes and fluid production is information that changes with respect to time. Material balance and reservoir flow modeling techniques use dynamic data to obtain original fluid volumes. An accurate characterization of the reservoir should yield consistent estimates of fluid volumes that are originally in place in the reservoir regardless of the method...
