Speaker(s): Paul Baville

Date: Thursday 21st of November 2019

Location: room G201, ENSG, Nancy

Abstract:

My main Phd topic is the computer assisted well correlation and I will present you two correlation rules based on (1) facies interpretations and (2) time surface geometry applied on data set from the North Sea, provided by Equinor ASA.
1. Facies correlation. Wells are cored and these cores are interpreted in several facies categorized by their paleo-depth (from  distal to continental deposits). Wells are also categorized regarding their distality in the sedimentary basin and the main sediment transport direction in the basin. Knowing the well distality and the facies paleo-depth, it is possible to compute a correlation cost for each couple of markers (between two wells).
2. Time surface geometry. Dip meter data is acquired along well paths during their drilling. Using this 3D data, it is possible to generate a 2D curve (3D surface) between 2 markers (3+ markers) using bezier curves (surfaces). In this seminar I will focus on 2D curves and 3D triangles (correlation between 2 and 3 wells, respectively). Knowing the paleo-environment, the bezier curve or triangle is generated. The comparison of its geometry to the top and base reservoir surfaces leads to a validation or not of the correlation.