Assessing Thermal Maturity Levels in Unconventional Hydrocarbon Reservoirs through Interval Inversion and Simulated Annealing

Valadez-Vergara, Rafael and Szabó, Norbert Péter (2023) Assessing Thermal Maturity Levels in Unconventional Hydrocarbon Reservoirs through Interval Inversion and Simulated Annealing. In: Near Surface Geoscience Conference & Exhibition 2023, September 3 - 7, 2023, Edinburgh, United Kingdom.

Preview

Text EAGE-Valadez-Vergara.pdf - Published Version Download (418kB) | Preview

Abstract

A new methodology has been developed to estimate the level of maturity (LOM) of reservoirs, which is critical for assessing potential organic shale gas deposits. LOM affects factors like porosity, pore size, type, and volume, and is usually determined through vitrinite reflectance laboratory analysis. The new method involves estimating LOM using interval inversion to approximate total organic carbon (TOC) values, followed by the application of a metaheuristic global optimization method called simulated annealing. The method establishes a cost function based on the mathematical expression proposed by Passey et al. (1990) which relates LOM and TOC, allowing for the approximation of LOM values without the need for core samples or vitrine reflectance measurements. Interval inversion assumes petrophysical parameters as functions of depth, while simulated annealing is a global optimization method based on the physical annealing process of metals. Passey’s method uses a linear relationship between sonic travel time and true formation resistivity log curves and TOC content to estimate TOC as a function of delta log R distance and LOM.

Actions (login required)

Edit Item