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DOLOMITIZATION IN MIOCENE CARBONATE PLATFORMS OF CENTRAL LUCONIA, SARAWAK: CHARACTER, ORIGIN, AND IMPACT ON RESERVOIR PROPERTIES

The occurrence of dolomite has been reported in several Miocene carbonate platforms of the Central Luconia Province, Sarawak. However their character, origin, and impact on reservoirs properties have received little attention. This study aims at conducting a thorough and comprehensive investigation...

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Main Author: ., RULLIYANSYAH
Format: Thesis
Language:English
English
Published: 2011
Subjects:
QE Geology
Online Access:http://utpedia.utp.edu.my/2866/1/Opening_pages.pdf
http://utpedia.utp.edu.my/2866/2/Rulliyansyah_M.Sc._Thesis_Jan-2011.pdf
http://utpedia.utp.edu.my/2866/
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spelling my-utp-utpedia.28662022-03-24T02:54:08Z http://utpedia.utp.edu.my/2866/ DOLOMITIZATION IN MIOCENE CARBONATE PLATFORMS OF CENTRAL LUCONIA, SARAWAK: CHARACTER, ORIGIN, AND IMPACT ON RESERVOIR PROPERTIES ., RULLIYANSYAH QE Geology The occurrence of dolomite has been reported in several Miocene carbonate platforms of the Central Luconia Province, Sarawak. However their character, origin, and impact on reservoirs properties have received little attention. This study aims at conducting a thorough and comprehensive investigation of the dolomite texture(s) present in two Miocene carbonate platforms of Central Luconia, their most probable origin, impact on reservoir properties, and an assessment of how the lateral distribution will likely be. A total of sixty five (65) core plugs, thirty (30) from the North Platform and thirty five (35) from the South Platform, were obtained and analyzed with microscopic and geochemical techniques. Results of the analyses show that the dolomites of the two carbonate platforms have distinctly different textures and considerably different diagenetic features and history. A mimetic replacement dolomitization is predominantly observed in the North Platform succession, where the dolomite retains the original precursor limestone texture. In the South Platform, dolomite is present in mostly non-mimetic replacement style, obliterating the original texture of precursor limestones. Dolomite crystals in both platforms are commonly planar euhedral, with a minor proportion of planar subhedral developed only in the deeper section of the South Platform. The size of the crystals ranges from < 10 μm to 180 μm. Stable isotope values and trace elements content show that pervasive dolomitization was most likely caused by diluted seawater that circulated on, or near the mixing zone area. Pore-filling and pore-lining dolomite cement may have precipitated from mixed-water in the mixing zone. An assessment of the geometry of the dolomite bodies, based on the proposed dolomitization model suggests that dolomites could have formed elongated dolomite bodies throughout the platforms, forming massive bodies that mimic the lens shape of a mixing zone. However, their thickness and the depth at which they will be encountered will most likely vary. 2011 Thesis NonPeerReviewed application/pdf en http://utpedia.utp.edu.my/2866/1/Opening_pages.pdf application/pdf en http://utpedia.utp.edu.my/2866/2/Rulliyansyah_M.Sc._Thesis_Jan-2011.pdf ., RULLIYANSYAH (2011) DOLOMITIZATION IN MIOCENE CARBONATE PLATFORMS OF CENTRAL LUCONIA, SARAWAK: CHARACTER, ORIGIN, AND IMPACT ON RESERVOIR PROPERTIES. Masters thesis, UTP.
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Electronic and Digitized Intellectual Asset
url_provider http://utpedia.utp.edu.my/
language English
English
topic QE Geology
spellingShingle QE Geology
., RULLIYANSYAH
DOLOMITIZATION IN MIOCENE CARBONATE PLATFORMS OF CENTRAL LUCONIA, SARAWAK: CHARACTER, ORIGIN, AND IMPACT ON RESERVOIR PROPERTIES
description The occurrence of dolomite has been reported in several Miocene carbonate platforms of the Central Luconia Province, Sarawak. However their character, origin, and impact on reservoirs properties have received little attention. This study aims at conducting a thorough and comprehensive investigation of the dolomite texture(s) present in two Miocene carbonate platforms of Central Luconia, their most probable origin, impact on reservoir properties, and an assessment of how the lateral distribution will likely be. A total of sixty five (65) core plugs, thirty (30) from the North Platform and thirty five (35) from the South Platform, were obtained and analyzed with microscopic and geochemical techniques. Results of the analyses show that the dolomites of the two carbonate platforms have distinctly different textures and considerably different diagenetic features and history. A mimetic replacement dolomitization is predominantly observed in the North Platform succession, where the dolomite retains the original precursor limestone texture. In the South Platform, dolomite is present in mostly non-mimetic replacement style, obliterating the original texture of precursor limestones. Dolomite crystals in both platforms are commonly planar euhedral, with a minor proportion of planar subhedral developed only in the deeper section of the South Platform. The size of the crystals ranges from < 10 μm to 180 μm. Stable isotope values and trace elements content show that pervasive dolomitization was most likely caused by diluted seawater that circulated on, or near the mixing zone area. Pore-filling and pore-lining dolomite cement may have precipitated from mixed-water in the mixing zone. An assessment of the geometry of the dolomite bodies, based on the proposed dolomitization model suggests that dolomites could have formed elongated dolomite bodies throughout the platforms, forming massive bodies that mimic the lens shape of a mixing zone. However, their thickness and the depth at which they will be encountered will most likely vary.
format Thesis
author ., RULLIYANSYAH
author_facet ., RULLIYANSYAH
author_sort ., RULLIYANSYAH
title DOLOMITIZATION IN MIOCENE CARBONATE PLATFORMS OF CENTRAL LUCONIA, SARAWAK: CHARACTER, ORIGIN, AND IMPACT ON RESERVOIR PROPERTIES
title_short DOLOMITIZATION IN MIOCENE CARBONATE PLATFORMS OF CENTRAL LUCONIA, SARAWAK: CHARACTER, ORIGIN, AND IMPACT ON RESERVOIR PROPERTIES
title_full DOLOMITIZATION IN MIOCENE CARBONATE PLATFORMS OF CENTRAL LUCONIA, SARAWAK: CHARACTER, ORIGIN, AND IMPACT ON RESERVOIR PROPERTIES
title_fullStr DOLOMITIZATION IN MIOCENE CARBONATE PLATFORMS OF CENTRAL LUCONIA, SARAWAK: CHARACTER, ORIGIN, AND IMPACT ON RESERVOIR PROPERTIES
title_full_unstemmed DOLOMITIZATION IN MIOCENE CARBONATE PLATFORMS OF CENTRAL LUCONIA, SARAWAK: CHARACTER, ORIGIN, AND IMPACT ON RESERVOIR PROPERTIES
title_sort dolomitization in miocene carbonate platforms of central luconia, sarawak: character, origin, and impact on reservoir properties
publishDate 2011
url http://utpedia.utp.edu.my/2866/1/Opening_pages.pdf
http://utpedia.utp.edu.my/2866/2/Rulliyansyah_M.Sc._Thesis_Jan-2011.pdf
http://utpedia.utp.edu.my/2866/
_version_ 1739830969210241024
score 13.211869

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