Paleogene sediment complex - Geological factors impacting on its reservoir quality and hydrocarbon potential
Abstract
The Paleogene reservoir complex has diverse facies which change rapidly in lateral and vertical direction. Its depositional environment is determined as alluvial, deltaic and tidally affected lacustrine, and rarely with shoreline facies. The variety in sedimentary facies and lithological heterogeneity are the main causes for the anisotropy in porosity and permeability of the Paleogene reservoirs, reducing field exploration and development efficiency as well as the application of secondary exploitation in order to increase the oil recovery.
Reservoir quality is resulted from the combined effects of primary diagenetic elements and secondary alteration. The secondary deformation has bidirectional influence on the reservoir quality, reducing the primary porosity and forming the secondary porosity as well. The dual porosity is one of the important properties of the Paleogene reservoir that should be considered in production management.
Secondary fractures could potentially increase the flow in the tight Paleogene reservoirs.
The production from Paleogene reservoir is still small, not corresponding to the potential of Paleogene formation as rich source rock. The Late Eocene-Oligocene reservoir, therefore, needs to be investigated and sufficiently evaluated as a potential hydrocarbon bearing play in order to enhance production and reserves.
References
Ngô Xuân Vinh. Những yếu tố chính ảnh hưởng đến tính chất thấm chứa của đá vụn lục nguyên Miocen - Oligocen bể Cửu Long. Hội nghị Khoa học - Công nghệ Tổng công ty Dầu khí Việt Nam. 2000.
Ngô Thường San, Cù Minh Hoàng. Chất lượng tầng chứa Paleogen bể Cửu Long. Tuyển tập Báo cáo Hội nghị Khoa học - Công nghệ 30 năm thành lập Viện Dầu khí Việt Nam. Nhà xuất bản Khoa học - Kỹ thuật. 2008.
Tập đoàn Dầu khí Việt Nam. Địa chất và Tài nguyên Dầu khí Việt Nam. 2007.

1. The Author assigns all copyright in and to the article (the Work) to the Petrovietnam Journal, including the right to publish, republish, transmit, sell and distribute the Work in whole or in part in electronic and print editions of the Journal, in all media of expression now known or later developed.
2. By this assignment of copyright to the Petrovietnam Journal, reproduction, posting, transmission, distribution or other use of the Work in whole or in part in any medium by the Author requires a full citation to the Journal, suitable in form and content as follows: title of article, authors’ names, journal title, volume, issue, year, copyright owner as specified in the Journal, DOI number. Links to the final article published on the website of the Journal are encouraged.