The Sedimentary Facies Evolution and the Development Characteristics of Source Rocks' in North Carnarvon Basin, Australia

doi:10.11885/j.issn.16745086.2016.04.07.01

Abstract

Abstract: The main purpose of this study was to investigate the relationship between the Mesozoic sedimentary environment and the characteristics of the source rocks of the North Carnarvon Basin in Australia. Employing information gleaned from more than 400 drilling wells and the test data of the basin, the Mesozoic sedimentary evolution of the basin was characterized for the first time. In addition, the characteristics of the development of the source rock were evaluated, and the influence of the sedimentary environment on hydrocarbon development in the source rock is discussed. The research shows that the sedimentary pattern in the Mesozoic transformed the North Carnarvon Basin several times, e.g., in the Late Triassic, a large sedimentary delta developed; in the Jurassic, a concave and convex shallow sea developed, with restricted marine deposition; in the Early Cretaceous, fan delta-submarine fan delta sedimentary deposits developed locally; and, in the Late Cretaceous, an open sea developed, with bathyal-abyssal sea deposition. In the Mesozoic, two high-quality source rocks developed, including gas-type source rocks in the Mungaroo Group delta-plain swamp environment during the Upper Triassic, and oil-type source rocks in the restricted marine environment of the Dingo Group during the Upper Jurassic. The gas-type source rock of the Mungaroo Group is the source of hydrocarbon generation in the basin.

Key words: North Carnarvon Basin, Mesozoic, sedimentary evolution, source rocks, delta, restricted marine

CLC Number:

TE122

YANG Ting, KANG Hongquan, LIU Dongxu, LI Xin, ZHAO Zhongying. The Sedimentary Facies Evolution and the Development Characteristics of Source Rocks' in North Carnarvon Basin, Australia[J]. 西南石油大学学报(自然科学版), 2017, 39(5): 81-91.

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