Gravity Analysis of The Penyu Basin Malaysia Using Free Air Anomaly (FAA) Satellite Data

Nalibrata, Laksmita Rosyidah Dyah (2024) Gravity Analysis of The Penyu Basin Malaysia Using Free Air Anomaly (FAA) Satellite Data. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Lahan lepas pantai di Malaysia menjadi sumber energi minyak dan gas alam yang besar. Cekungan Penyu, sebagai representasi cekungan sedimen lepas pantai Malaysia yang telah dipelajari secara menyeluruh namun masih mengandung potensi hidrokarbon yang belum ditemukan. Penelitian ini menggunakan metode geofisika, khususnya analisis gravitasi, untuk mendalami Cekungan Penyu di Malaysia. Data anomali gravitasi regional (Free Air Anomaly) diekstraksi dan diolah menggunakan perangkat lunak Oasis Montaj. Dengan memanfaatkan berbagai peta, termasuk peta anomali sisa, peta sinyal analitik, dan peta anomali THD, tren struktural Cekungan Penyu dapat diketahui, menunjukkan orientasi sepanjang arah NE–SW dan NW–SE secara kualitatif. Peta Dekonvolusi Euler 3D dibuat untuk memberikan estimasi kuantitatif lokasi dan kedalaman sumber gravitasi. Integrasi data anomali gravitasi dengan data sumur dan seismik memfasilitasi proses 2D forward modelling secara rinci yang memungkinkan pemodelan bawah permukaan dan penggambaran struktur geologi yang signifikan. Analisis geologi mengkonfirmasi keberadaan struktur graben dan half graben di daerah penelitian. Identifikasi tiga fase tektonostratigrafi yang berbeda dan analisis spektral mengungkapkan kedalaman regional pada fase Pre-rift sebagai batuan dasar, transisi pada fase Syn-rift yang diwakili oleh formasi Penyu pada zaman Oligosen pada lingkungan lakustrin hingga aluvial, dan pada masa Pasca -fase keretakan ditandai dengan berkembangnya formasi Terengganu yang diikuti oleh Formasi Pari yang juga teridentifikasi sebagai transisi yang mulai berkembang pada zaman Miosen dan berkembangnya formasi Pilong pada zaman Kuarter sebagai kedalaman residual pada lingkungan laut dangkal. Hasil penelitian ini memberikan kontribusi besar terhadap pemahaman secara keseluruhan mengenai analisis geologi Cekungan Penyu dan menekankan pada pentingnya studi geofisika yang sedang berlangsung dengan mengintegrasikan beragam data untuk memajukan upaya eksplorasi sumber daya alam.
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The offshore lands in Malaysia are a great source of oil and natural gas energy. Penyu Basin is a representative of an offshore Malaysian sedimentary basin that has been equitably studied but may yet contain undiscovered hydrocarbon potential. The studies using geophysical methods such as gravity were carried out to conduct a geophysical analysis of the Penyu Basin in Malaysia by extracting regional gravity anomaly grid data (Free Air anomalies) which will be further processed using the Oasis Montaj software. Utilizing various maps, including the residual anomaly map, analytic signal map, and THD anomaly map, the structural trend of the Penyu Basin is determined, revealing orientations along NE–SW and NW–SE directions qualitatively. A 3D Euler Deconvolution map is generated to provide quantitative estimations of gravity source locations and depths. Integration of gravity anomaly data with well and seismic data facilitates a detailed 2D forward modelling process. This enables the construction of a subsurface model, allowing for the delineation of significant geological structures. The geological analysis confirms the presence of both graben and half graben structures in the study area. The identification of three distinct tectonostratigraphic phases and spectral analysis reveals deep sources during the Pre-rift phase as the basement, intermediate sources during the Syn-rift phase represented by the Penyu formations in the Oligocene era in lacustrine to alluvial environment, and during the Post-rift phase marked by the development of the Terengganu formation followed by Pari formation which also identified as the intermediate sources that start developed in the Miocene era and the development of the Pilong formation in the Quaternary era as a shallow source in shallow marine environment. This discovery makes a substantial contribution to our overall understanding of the geological analysis of the Penyu Basin. The results emphasize the importance of ongoing geophysical studies and the integration of diverse datasets to advance the progress of natural resource exploration endeavours.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Gravity Methods, Free Air Anomaly, Penyu Basin, Metode Gayaberat, Analisis Gravitasi, Cekungan Penyu
Subjects:	Q Science > Q Science (General) > Q180 Gravitation. Q Science > QE Geology > QE601 Geology, Structural
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	LAKSMITA ROSYIDAH DYAH NALIBRATA
Date Deposited:	29 Jan 2024 14:35
Last Modified:	29 Jan 2024 14:35
URI:	http://repository.its.ac.id/id/eprint/105737

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