A Multiarray Induction Tool Optimized for Efficient Wellsite Operation

Core-log comparisons are often not considered routinely enough within the exploration environment. This may be for a number of reasons, such as problems with depth-matching the core and log datasets, the environment of acquisition of both datasets, the lack of understanding of log and core acquisition or a lack of confidence in laboratory or log measurements. These problems are discussed as a preliminary step to the development of a strategy aimed at improving core-log integration.Using recent technological advances in the side-by-side presentation of core and high resolution image data from logging tools, a strategy is presented with the aim of making core-log integration more rigid and routine. Features in both core and images are correlated interactively--thus ensuring the best possible integration. This is a two stage process involving core-to-image matching, and then image-to-log matching. This strategy has the potential to make core-log integration more accurate and as a result enable the interpreter to realize the most from sub-surface data.Borehole logging provides quasi-continuous (typically every 150mm), in situ measurements

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Multicomponent induction response in a borehole environment

Wang

Fanini

2003

GEOPHYSICS

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Field and numerically simulated data show that coplanar induction measurements (σxx and σyy) are affected by both conductive and resistive muds. The effect is, for a resistivity contrast of 10 or less between the formation and mud, approximately proportional to the resistivity contrast. The borehole effect is generally stronger for a decentralized tool. In the perpendicular eccentricity mode, the eccentricity effect on σxx or σyy can be greater than 100% of the true formation responses. We demonstrate that dual‐frequency processing can reduce the eccentricity effect by an order of magnitude. We investigate the effect of invasion for both circular and elliptic invasions. For circular invasion, the effect on σxx, σyy, or the coaxial measurement (σzz) is characterized by a critical invasion thickness. For invasion thinner than the critical thickness, the effect is minimal. The effect increases rapidly as invasion thickness increases beyond the critical thickness. For elliptic invasion, both the σxx and σzz responses are similar to those of the corresponding inner circular invasion. Beyond a long‐to‐short‐axis ratio of three, an elliptic invasion behaves like a long, thin fracture.

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A Multiarray Induction Tool Optimized for Efficient Wellsite Operation

Cited by 7 publications

References 14 publications

Simultaneous reconstruction of geometric parameter and resistivity around borehole in horizontally stratified formation from multiarray induction logging data

Simultaneous reconstruction of geometric parameter and resistivity around borehole in horizontally stratified formation from multiarray induction logging data

Aspects of core-log integration: an approach using high resolution images

Multicomponent induction response in a borehole environment

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