…
comment: The repository administrator has not yet configured an RDF license.
primary topic: Application of spectral decomposition technique to delineate the evolution of karst on carbonate platforms of central luconia, offshore Sarawak, Malaysia

Application of spectral decomposition technique to delineate the evolution of karst on carbonate platforms of central luconia, offshore Sarawak, Malaysia
type: AcademicArticle
type: Article
abstract: Karstification in carbonate platforms of the Miocene age in Central Luconia province, offshore Sarawak, Malaysia, has been discussed since the onset of exploration and initial discoveries in the region, with over 200 mapped platforms to date. An extensive drilling program over the last decade confirmed the existence of karst during the drilling process where issues such as total loss circulation and bit drops were common. Karst in Central Luconia has been proposed by several authors; however, detailed quantitative description of the observed features have not yet been conducted. This study involves systematic mapping of loss circulation depths, chalkified/rubble/vuggy zones described from cores, and vugs of >2 mm in size and moldic porosity observed on thin sections of the Jintan platform. These data supplement the interpretation of karst from multiple 3D seismic attributes. Seismic interpretation of the Jintan and M1 platforms revealed an extensive dendritic pattern which is on average 70â��100 m deep and 3â��5 km long, and circular geobodies of 1 km in width that exist on the upper part of the platform. Spectral decomposition, also known as time-frequency analysis, was used to enhance the interpretation of karst features on seismics within a specific wavelength. In this study, a comparison of three spectral decomposition methods applied on the 3D seismic cube of the Jintan and M1 platforms was undertaken to determine the method which allowed for better delineation of the karst features. The results show that the short-time Fourier transform (STFT) method using frequencies of 46, 54, and 60 Hz delineated most of the karst features compared to the continuous wavelet transform (CWT) Morlet and CWT Ricker wavelet methods. This paper aims to discuss the dimensions, evolution and geometry of the karst features quantitatively on three selected karst horizons named â��K1â��, â��K2â��, â��K3â��. Interpretation revealed that the dendritic karst features were found to be mos…
date: 2021
volume: 11
issue: 24
is part of: Applied Sciences (Switzerland)
status: peerReviewed
status: published
author list: authors
type: EPrint
type: ArticleEPrint
is part of: repository

MDPI
type: Organization

Applied Sciences (Switzerland)
type: Collection
issn: 20763417

S.S.A. Rahman
type: Person
given name: S.S.A.
family name: Rahman

N.H.M. Jamin
type: Person
given name: N.H.M.
family name: Jamin

R. Rosli
type: Person
given name: R.
family name: Rosli

M.C. Poppelreiter
type: Person
given name: M.C.
family name: Poppelreiter

M.H. Husen
type: Person
given name: M.H.
family name: Husen

G.J. Soto
type: Person
given name: G.J.
family name: Soto

S.B. Bing
type: Person
given name: S.B.
family name: Bing

HTML Summary of #14158 Application of spectral decomposition technique to delineate the evolution of karst on carbonate platforms of central luconia, offshore Sarawak, Malaysia
format: text/html
primary topic: Application of spectral decomposition technique to delineate the evolution of karst on carbonate platforms of central luconia, offshore Sarawak, Malaysia