西南石油大学学报(自然科学版) ›› 2018, Vol. 40 ›› Issue (3): 34-42.DOI: 10.11885/j.issn.1674-5086.2017.01.04.04

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Characteristics of Analog Hydrocarbon Reservoir Formation in Continental Margin Delta Basins

JIA Huaicun, KANG Hongquan, LI Minggang, CHENG Tao, MENG Jinluo   

  1. CNOOC Research Institute Co., Ltd., Chaoyang, Beijing 100028, China
  • Received:2017-01-04 Online:2018-06-01 Published:2018-06-01

Abstract: Continental margin delta basins tend to be rich in hydrocarbon resources and contain many hydrocarbon reservoirs; for example, the Niger Delta Basin in West Africa, the Ruvuma Basin Delta in East Africa, and the Mahakam Delta in the Kutai Basin, Indonesia. An analog study was conducted to examine the different petroleum-geological characteristics of different types of continental margin delta basin. Our results reveal that delta basins that formed during different stages of tectonic evolution exhibit very different basin structures, internal structural styles, source rock characteristics, and hydrocarbon reservoir formation patterns. For example, the Niger Delta and Ruvuma Basin Delta developed during the drift stage and their gravitational nappe structures are well developed. Conversely, the Mahakam Delta in the Kutai Basin developed during the depression phase of rifting and its gravitational nappe structures are poorly developed. The reservoirs in both the Mahakam Delta and Niger Delta Basin essentially consist of oil source rocks originating mainly from the delta system and are characterized by self-generation, self-preservation, and near-source formation. Conversely, reservoirs in the Ruvuma Basin in East Africa consist of cracked gas marine source rocks originating from the lower-Jurassic gulf environment and are characterized by stepped long-distance migration and far-source formation.

Key words: delta basin, petroleum geological conditions, continental margin basin, hydrocarbon reservoir formation, tectonic evolution

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