Systems, methods, and computer-readable media for continuous capillary pressure estimation

Abstract

Provided are methods, systems, and computer-readable media for determining capillary pressure in a basin/reservoir. Well log data is obtained that includes permeability log data, porosity log data, water saturation log data, and oil saturation log data. Thomeer parameters for a multi-pore system of a Thomeer model are determined by evaluating an objective function that measures the mismatch between the well log data and modeled data having the Thomeer parameters as input. The objective function is iteratively evaluated using linear equality constraints, linear inequality constraints, and nonlinear equality constraints until convergence criteria are met.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention relates generally to sedimentary basin exploration and reservoir hydrocarbon production and, more particularly, to estimating capillary pressure for basin exploration and reservoir development and production.[0003]2. Description of the Related Art[0004]Various exploration and production systems are employed to find and extract oil, natural gas, and other resources from natural basins and reservoirs in the earth. Capillary pressure is a property used for basin exploration and reservoir development and production. For example, capillary pressure may be used to compute the original hydrocarbon in place (OHIP) and to estimate a recovery factor. Reservoir modeling and simulation enables characterization of static reservoir properties and prediction of reservoir dynamic behavior. Exploration and production activities and strategies are strongly impacted by reservoir modeling workflows and techniques. Accordingl...

AI Technical Summary

Benefits of technology

[0006]Various embodiments of methods, computer-readable media, and systems for determining capillary pressure in a basin and a reservoir are provided herein. In some embodiments, a method is provided that includes accessing well log data from a well log for a well, the well log data comprising permeability log data, porosity log data, water saturation log data, and oil saturation log data and determining Thomeer parameters from the permeability log data, the porosity log data, the water saturation log data, and the oil saturation log data.

Problems solved by technology

However, due to the expense and time associated with SCAL procedures, only

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