Chevron U.s.a. Inc.

Emmanuel Toumelin

Boqin Q Sun

Haijing Wang

Bo Gong

Dustin J Keele

Hanming Wang

Simon Clinch

A method for determining water-filled porosity and water salinity in a well includes obtaining complex dielectric permittivity of earth formations, either from dielectric measurements representative of well cores, or from dielectric well logs; selecting a dielectric mixing law for the index number m; plotting a m-th root of complex dielectric permittivity at a specified frequency in the complex domain, wherein m is an index number; determining a matrix permittivity, a water salinity, and a water-filled porosity based on the complex dielectric permittivity and the dielectric mixing law; and displaying the water salinity and the water-filled porosity.

System and method for determining water-filled porosity and water salinity in well cores and logs

A method is described for ways to generate a Fraction of Sand (F) estimate and net-to-gross (NTG) estimate of sand in a formation using a machine-learning algorithm such as a neural network based on borehole image logs. The method may use the Fand other information to estimate hydrocarbons in place in a subsurface formation. The method may be executed by a computer system.

System and method for quantitative analysis of borehole images

A nuclear magnetic resonance relaxation time cutoff between results for a bound-water index of rock and a free-fluid index of the rock is determined. The determination is made based on measured and predicted values for permeability and/or wettability over a set of core plugs. The determination does not require a nuclear magnetic resonance operation performed on the core plugs under irreducible water saturation.

Growing community of inventors

Houston, TX, United States of America

Emmanuel Toumelin