A Measure of Local Coherency Calculated from Wells for Data Checking and Geological Zonation

Summary A measure of coherency in facies between nearby wells is developed to aid in the processes of quality control of well data and geological zonation. Coherency measures the agreement between a well and its immediate neighbours based on structural markers and facies interpretations. The calculation can be done incrementally on sets of wells to identify incoherencies caused by errors in interpretation, measurement differences, data acquisition problems or actual changes caused by geological differences. Attributes may include the year a well was interpreted or included in a database, the interpreter, or what logging tool was used. An example involving the fluvial depositional environment of the lower McMurray formation is used to demonstrate how the measure of coherency can be used to detect quality issues between wells logged in different years.