1 AIT Asian Institute of Technology

Reservoir characterization of the lower oligocene section in the K-Field of Cuu Long Basin, Southern Vietnam

AuthorBui Thi Kieu Nga
Call NumberAIT RSPR no.PME-GEPG-09-06
Subject(s)Reservoirs--Cuu Long Basin (Vietnam)

NoteA research submitted in partial fulfillment of the requirements for the degree of Master of Engineering Professional in Geoexploration and Petroleum Geoengineering
PublisherAsian Institute of Technology
Series Statement
AbstractThis study deals with reservoir characterization of the lower Oligocene section of the K field in the Cuu Long basin, Southern Vietnam. The oligocene gas reservoirs of the K field consist of sandstone layers with thickness ranging from several meters to several tens of meters. Sandstones are classified mainly as arkose or lithic arkose, deposited in a continental environment with alluvial, fluvial point bar facies. Integrations of petrological data a nd petrophysical parameters derived from application of new approach in log quantitative interpretation, could show vertical and lateral change of reservoir quality of these sandstones. The reservoir quality decreases with depth within every well. Laterally, reservoir quality is moderate to fair in K-1X, 2X area and gradually decrease in K-3X area (moderate to poor) and in K- 4X area (poor to very poor, especially fo r F sand ). These characteristics are caused mainly by formation depth and strongly influenced diagenesis processes. The differences between areas within the K field have shown a very complicated development of these reservoirs. They may be independent sandstone bodies, isolated by facies changing. Petrophysical analysis of the sediments in the K-field was done, using the Interactive Petrophysis ® software package. Once depth-matched calibration with the core measurements is done, more reliable prediction of lithology and reservoir properties in the non cored intervals is possible. Four flow units of reservoir were determined using plug-measured reservoir properties. Flow unit 1 is a lowest quality flow unit with very low permeability and porosity (porosity ranges from 3 to 9%, white permeability is less than 0.1mD. Flow unit 2 is higher quality than flow unit 1 with porosity and permeability concentrated in the lower values (porosity is less than 11%, permeability ranges from 0.1 mD to 1 mD). ). Flow unit 3 is highter quality than flow unit 1 and 2 with porosity and permeability concentrated in the medium values (porosity is ranges from 0.06-0.13, permeability ranges from 1mD to 30 mD). Flow unit 4 is a highest quality unit with high permeability and porosity values (porosity is 11% and higher, permeability ranges from 30 mD to 600 mD. The reservoir properties and flow units are useful inputs into any Geomodelling work that will be carried out to better define th e three dimensional of reservoir architecture in the later phases of the field development. For exploration purposes, recognition of geologic patterns are related to crevasse splay, distributary channels deposits. For a given chronostratigraphic interval this allows geometry of reservoir system to be better defined and probable location of seals to be identified.
Year2009
Corresponding Series Added Entry
TypeResearch Study Project Report (RSPR)
SchoolSchool of Engineering and Technology (SET)
DepartmentDepartment of Civil and Infrastucture Engineering (DCIE)
Academic Program/FoSGeotechnical Engineering and Management (Master Engineering (Professional)) (PME - GEPG)
Chairperson(s)Pham Huy Giao
Examination Committee(s)Nppadol Phien-wej;Suwat Athichanagorn
Scholarship Donor(s)PetroVietnam Exploration and Production Co.
DegreeResearch studies project report (M. Eng.) - Asian Institute of Technology, 2009


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