Regional Maturation Study in the King Christian Island Area, Arctic Canada

Abstract

The hydrocarbon potential of the Mesozoic succession in the vicinity of King Christian Island in central Sverdrup Basin was evaluated on the basis of maturation parameters and knowledge of the regional geology. The Triassic Schei Point Group, which is the main source rock interval in Sverdrup Basin, is in the mature stage of hydrocarbon generation (Ro>0.60%). The type of organic matter is mainly plank-tonic marine algae and bituminite, deposited in an offshore shelf setting. Rock-Eval Tmax values are in the range 428–444°Q in general agreement with reflectance. Organic richness is indicated by the high hydrogen index (HI) values in the shales (in excess of 300 mg HC/gTOC). Less rich source rocks are found in the Jurassic-age Jameson Bay and Ringnes formations, in accordance with previous studies in the nearby Lougheed and Melville islands. Numerous oil and gas fields have been discovered in King Christian Island to date. Geology shows that the presence or absence of liquid and gaseous hydrocarbons in the reservoirs is related to the development of a system of faults and fractures in the successions stratigraphically above the source rocks. These zones have acted as conduits for oil and gas migration and, ultimately, loss. The presence of bitumen staining and numerous populations of solid bitumen, interpreted as allochthonousty derived, support the theory of hydrocarbon migration in the King Christian Island succession. Migration has taken place over a vertical distance of 800 m to 1500 m. Problems were encountered in measuring vitrinite reflectance, related mainly to the presence of cavings, bitumen staining, vitrinite typing, oxidation of organic matter, and effect of igneous intrusions. The thermal effect from igneous sills and dykes resulted in thermal cracking of liquid hydrocarbons to gaseous in certain areas. A zone of paleo-overpressure was identified near the contact between a thick sandstone unit and overlying shales exhibiting a “kinky” vitrinite reflectance profile. Overpressure was attributed to a combination of hydrocarbon generation in the Schei Point or deeper source rocks, high rates of sedimentation in Jurassic to Cretaceous shale units, differential compaction of lithologies, and entrapment of pore water.