Geological Notes: Warta Geologi, Vol. 45, No. 1, March 2019, pp. 1–5


Application of sand percentage to evaluate fault seal risk

Robert Shoup1,*, John Jong2, Franz L Kessler3
1 Subsurface Consultants & Associates, USA
2 JX Nippon Oil and Gas Exploration (Malaysia) Ltd, Malaysia
3 Goldbach Geoconsultants O&G and Lithium Exploration, Germany
*Corresponding author email address:

Abstract: In hydrocarbon exploration, establishing Allan Sections, calculating Shale Smear Factor and Shale Gouge Ratios are the few commonly applied methods for assessing fault seal risk. In this paper, an alternative approach is introduced to evaluate seal risk at the prospect scale by overlaying a sand percent map over the prospect structure map to help quantify seal risk along the fault trace. This approach effectively integrates all G&G data readily accessible to an interpreter during a prospect maturation process to narrow the seal risk uncertainty.

Keywords: Allan Sections, fault seal, sand percent, Shale Smear Factor, Shale Gouge Ratios