An Approach to Detailed Dip Determination Using Correlation by Pattern Recognition

Abstract

The downhole equipment of today's high resolution dipmeter tool (HDTTM? has two perpendicular, extendable pairs of arms. Each arm carries a pad, which is hydraulically pressed against the wall of the hole during logging. A microfocused conductivity (dipmeter) curve This paper describes a new method for processing dipmeter logs. Each correlation curve is decomposed into a depth-ordered sequence of ranked elements (geological events reflected as curve features). These curve elements are correlated from curve to curve, with higher-quality correlations accepted first. This method has much greater resolution for definition of thin-bed boundaries than conventional techniques. 232 JOURNAL OF PETROLEUM TECHNOLOGY

Computer Techniques for the Zoning and Correlation of Well‐logs*

“…Two algorithms for point to point correlation have recently been developed. One uses a pattern recognition scheme (Vincent, Gartner and Attali 1979), while the other is based on frequency considerations (Kerzner 1982(Kerzner , 1983. Pattern recognition.…”

“…Pattern recognition. The method of Vincent et al (1979) is implemented as Schlumberger's GeodipTM processing. With this technique, each dipmeter curve to be correlated is decomposed mathematically into a depth-ordered sequence of ranked elements so that correlations of higher-ranking elements are made first and subsequent correlations of lower-ranking elements are not allowed to cross correlations of higher-ranking events.…”

“…6. Examples of the various curve elements used in the feature extraction method of Vincent et al (1979): peaks, troughs, spikes, steps and levels.…”

“…The application of pattern recognition methodologies (Vincent et al 1979, Kerzner 1983, Stephanou 1979) has already been noted as coming into prominence in the past few years. Indeed, its presence has been felt strongly in the field of seismic data analysis with many papers being recently published, e.g., Bois (1980Bois ( , 1981Bois ( , 1983, Chen (1978), Liu and Fu (1983).…”

“…So far, only two pattern recognition type of approaches to the well-log zoning and correlation problem have been mentioned, those of Stephanou (1979) and Vincent et al (1979). Currently the author is investigating new ways of representing the raw data of the well-logs to facilitate analysis by linguistic methods.…”