Get this from a library! Basic well log analysis. [George B Asquith; Charles R Gibson; Steven Kirk Henderson; Neil F Hurley; Daniel Krygowski;. Basic Well Log Analysis (Second Edition) By. George Asquith and Daniel Krygowski (with sections by Steven Henderson and Neil Hurley). AAPG Methods in. Front Matter. qxd 8/5/04 AM Page i. Basic Well Log Analysis (Second Edition). By George Asquith and Daniel Krygowski (with sections by Steven.

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A genetic algorithm-based joint inversion method is presented for evaluating hydrocarbon-bearing geological formations. We showed earlier that the depth coordinates of layerboundaries can be determined within the interval inversion procedure.

A series expansion based discretization scheme ensures much more data against unknowns that significantly reduces the welll error of model parameters. To naalysis this requirement, we suggest the use of our interval inversion method, which inverts simultaneously all data from a greater depth interval to estimate petrophysical parameters of reservoirs to the same interval.

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We perform multidimensional hierarchical cluster analysis on well-logging data before inversion that separates the measuring points of different layers on a lithological basis.

Well logs contain information about layer-thicknesses, but they cannot be extracted by the local inversion approach. The knowledge of reservoir boundaries is also required for reserve calculation. In this study, we apply an automated procedure for the determination of rock interfaces. Abdulaziz, Abdel Sattar A. Conventional inversion procedures routinely used in the oil industry perform the inversion processing of borehole geophysical data locally.

As having barely more types of data than unknowns in a depth, a set of marginally over-determined inverse problems has to be solved along a borehole, which is a rather noise sensitive procedure.

Basic Well Log Analysis Course … – GEO – Spring – Universitetet i Oslo

For the reduction naalysis noise effect, the amount of overdetermination must be increased. Analyzis Control and AutomationVol. As a result, the vertical distribution of clusters furnishes the coordinates of layer-boundaries, which are then used as initial model parameters for the interval inversion procedure.


The weakness of method is that the output of inversion is highly influenced by arbitrary assumptions made for layer-thicknesses when creating a starting model i. Scientific Research An Academic Publisher.

The improved inversion method gives a fast, automatic and objective estimation to layer-boundaries and petrophysical parameters, which is demonstrated by a hydrocarbon field example.