Influence of igneous intrusions on thermal maturity of Late Cretaceous shales in the Tuma well, Chad Basin, NE Nigeria

Abstract

This study evaluates the influence of igneous intrusions on the thermal maturity of Late Cretaceous (Turonian–Santonian) potential source rock shales within the Gongila and Fika formations penetrated by the Tuma well. Twenty representative shale samples of the two formations between 1000 m and 3195 m were analyzed by bulk organic geochemical and palynofacies methods.