Abstract

Dipmeter logging tool has gained acceptance in petroleum industry as a means to define subsurface sedimentary structures and to detect geologic signatures of tectonic events. The advantage of dipmeter, over seismic is that it provides accurate informations near the well bore and detects structural features beyond seismic resolution. Identification of these structural features and detection of their orientations are done on the basis of structural dip trend analysis which compares characteristic dip patterns of various geological structures with observed dip patterns on computed dip plot. A detailed examination of raw dipmeter curves and correlation logs and proper selection of dip processing parameters are significant in this respect. These facts have been explained with the help of dipmeter log data of a well in Baramura field processed with inhouse software. In this well, a minor normal drag fault has been identified and its orientation has been determined. Various conditions necessary for reliable and meaningful structural dip trend analysis have also been discussed.