New method for simultaneous inversion of reservoir porosity, water saturation and shale content parameters

Abstract

The invention provides a new method for simultaneous inversion of reservoir porosity, water saturation and shale content parameters. The method comprises steps: 1, elastic parameters, logging data and core data information are acquired; 2, rock elastic parameters and reservoir physical parameters are combined, and a rock physical model is built; 3, an objective function for inversion of the reservoir porosity, the water saturation and the shale content is built, and the objective function is solved; and 4, through solving the objective function, an inversion result for the reservoir porosity parameter, the water saturation parameter and the shale content parameter is outputted. The method combines rock physics and geostatistical analysis, research on a new method for reservoir physical recognition is developed, physical parameters such as the porosity and the saturation of the reservoir are obtained, the objectivity and the accuracy of reservoir physical estimation result are improved, and important economic and social significance is achieved.

Description

technical field [0001] The invention relates to the field of reservoir geophysics in geophysical exploration, in particular to a new method for simultaneous inversion of reservoir porosity, water saturation and shale content parameters. Background technique [0002] Post-stack wave impedance inversion technology began to appear in the 1970s. At that time, the research on seismic inversion was mainly based on post-stack one-dimensional wave impedance inversion based on convolution model. It has been widely used in the 1990s, and the processing technology has been gradually improved and matured in a large number of practices. Various algorithms and application results around one-dimensional wave impedance inversion emerge in endlessly. However, with the development of wave impedance inversion technology, people have gradually realized some defects and deficiencies in wave impedance inversion: the use of full-angle multiple stacking loss and blurring of some information reflect...

AI Technical Summary

Problems solved by technology

However, with the development of wave impedance inversion technology, people have gradually realized some defects and deficiencies in wave impedance inversion: the use of full-angle multiple stacking loss and blurring of some information reflecting lithology and oil and gas properties weakens the The sensitivity of seismic data to reflect changes in reservoir characteristics leads to multi-solution problems in the application of post-stack seismic inversion data and seismic attribute data. In addition, wave impedance simulation can only provide a few types of P-wave wave impedance and other parameters. Research on reservoir properties and fluids is limited, etc.

In terms of reservoir physical properties research, at present, most of them start from the point of view of statistical learning, through tutor learning and stochastic simulation methods, such as multi-attribute inversion and geostatistical inversion. The disadvantage of these methods lies in the geological and earth The theoretical basis of physics is insufficient, and it is more of a mathematical transformation. When leaving the control point used to derive the statistical relationship, the statistical relationship will become unreliable, and the result of physical property identification will also become unreliable.

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