The Role of Rock Volumes in Log to Core Integration (Poster) [Abstract]

ABSTRACT As more wireline logging tools are developed and core becomes more available, the necessity of integrating this information into a coherent picture has taken on increased significance to many geologists and log analysts. When reservoir parameters derived from log analysis do not correspond with those derived from core analysis, the results from either or both may be suspect. The difficulty encountered in log-to-log and log-to-core interpretation can, in part, be attributed to ambiguities about the volume of rock investigated by downhole wireline logging tools and core analysis. A marginal correlation from log-to-log or log-to-core may be the result of poor depth control, bad hole conditions, or neither of these. Small differences may instead reflect the influence of microscopic and mesoscopic formation heterogeneity. The vertical resolution and depth of investigation of the sampling device can be used to estimate the volume of rock investigated by the device. The degree of correlation between diverse measurements of differing rock volumes provides an insight into the degree of homogeneity or heterogeneity of the larger volume. The closer the correlation, the greater the homogeneity of the larger volume. A variety of rock volumes have been estimated and those volume estimates should be used as a first pass at comparison between logs and cores. * This material was presented as an oral presentation at CWLS, 1989 End_of_Record - Last_Page 163-------