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公开(公告)号：EP1224490A4
公开(公告)日：2005-04-13
申请号：EP00992749
申请日：2000-10-25
IPC分类号： G01V3/38
摘要： Apparatus and method for obtaining facies of geological formations for identifying mineral deposits. Logging instruments (16) are moved in a borehole (10) to produce log measurements at successive levels of the borehole. The set of measurements at each such level of the borehole interval is associated with reference sample points within a multidimensional space. The multidimensional scatter of sample points is analyzed to determine a set of characteristic modes. The sample points associated with characteristic modes are grouped to identify clusters. A facies is designated for each of the clusters and a graphic representation of the succession of facies as a function of the depth is thus obtained. To identify the clusters, a "neighboring index" of each log measurement point in the data set is calculated (510). Next, small natural groups of points are formed (515) based on the use of the neighboring index to determine a K-Nearest-Neighbor (KNN) attraction for each point. Independently of the natural group formation, an optimal number of clusters is calculated (520) based on a Kernel Representative Index (KRI) and based on a user-specified resolution. Lastly, based on the data calculated from the prior steps, final clusters are formed (530) by merging the smaller clusters.
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公开(公告)号：EP0886717A1
公开(公告)日：1998-12-30
申请号：EP98902030
申请日：1998-01-06
申请人： ELF EXPLORATION PROD
发明人： SANCHO JEAN , GUERIN JEAN-CLAUDE
IPC分类号： E21B17/16
CPC分类号： E21B17/16
摘要： The invention concerns an asymmetrical drill stem, located at the end of an assembly of boring rods for drilling an oil well. The asymmetry is provided by the presence of recesses (24) arranged in the body (20), which recesses are of different sizes, arranged on the external surface of the drill stem and extend for the major part along the drill stem.
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