Equinor Energy As

Statoil Petroleum As

Sintef Petroleumsforskning

Ketil Hokstad

Kenneth Duffaut

Christine Fichler

Rune Kyrkjebø

Zuzana Alasonati Tasarova

Torgeir Wiik

Emmanuel Causse

Anders Dræge

Bjørn Magnus Sæther

Kati Tänavsuu-Milkeviciene

Anders Draege

Rune Kyrkjebo

A method of calculating the temperature and/or porosity of a geological structure, wherein there is provided at least two geophysical parameters of the geological structure, the method including inverting the at least two geophysical parameters to estimate the temperature and/or porosity of the geological structure.

Method of calculating temperature and porosity of geological structure

A method of calculating the temperature of a geological structure is disclosed, wherein there is provided a magnetic parameter of the geological structure. The method includes inverting the magnetic parameter to estimate the temperature of the geological structure.

Method of calculating temperature of a geological structure

The present disclosure relates to a method of calculating the radiogenic heat production (RHP) of a geophysical structure, wherein there is provided at least one geophysical parameter of the geophysical structure, the method including inverting the at least one geophysical parameter to estimate the RHP of the geophysical structure.

Method of calculating radiogenic heat production

A method is disclosed for the estimation of subsurface temperature distributions from a 3-dimensional heat conductivity model for a geological formation. The method may be characterized by the following steps: (a) obtaining measured data corresponding to a geological subsurface formation of interest including seismic survey data, in-well temperature, seafloor or surface heat flux measurements and laboratory-based measurements of core porosity, (b) estimating a relationship between seismic velocity and heat conductivity, wherein seismic velocity is linearly dependent on porosity and heat conductivity is exponentially or linearly dependent on porosity, and (c) calibrating the model to the measured in-well data and laboratory-based measurements of core porosity.

Temperature modeling constrained on geophysical data and kinematic restoration

There is described a technique for determining a temperature at a region below the surface of the Earth. In an embodiment, a time of travel of a seismic wave following the emission from a source into the earth is provided, and the travel time is used to estimate the temperature. In one example, a model based on the travel time and a further component, which may for example be based on heat flow and a constant of proportionality between seismic velocity and thermal conductivity, may be used to estimate the temperature.

Determining sub-surface temperature

A method of constructing a basis of functions intended for the building of approximations of one-way or two-way seismic traveltime versus offset functions. The method is characterized by the combination of the following steps of (a) creating a distribution of reference one-way or two-way traveltime versus offset functions by traveltime modelling in a set of velocity models representing possible velocity distributions, (b) obtaining new reference functions by modifying these reference traveltime functions by applying an operator to them, (c) selecting a set of discrete offsets to make these new reference functions discrete, (d) arranging these discrete functions in columns to form a matrix, (e) applying a singular value decomposition to this matrix, with singular values sorted in decreasing order, to express its columns as linear combinations of the columns of an orthogonal matrix, and (f) building the basis functions by interpolating the columns of the orthogonal matrix.

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Trondheim, Norway

Ketil Hokstad