Integrated Geophysical Acquisition And Processing For Groundwater Exploration

Ashari, Alexander Zulkarnaen (2025) Integrated Geophysical Acquisition And Processing For Groundwater Exploration. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

This study focuses on integrating resistivity and seismic methods for groundwater exploration in Kinta Valley, Perak, specifically at Universiti Teknologi PETRONAS. Groundwater is a very important resource which require appropriate geophysical acquisition to explore. The resistivity method, using the Wenner-Schlumberger configuration, was chosen to map the variations in resistivity of the subsurface, identifying water-bearing zones. Simultaneously, seismic reflection methods were applied to delineate geological boundaries and structures. The acquisition layout and parameters for both methods were designed and optimized to improve the quality of the data, though limitations such as limited available space and noise were encountered. Appropriate data processing workflows have been conducted to improve subsurface imaging including inversion modelling for resistivity and stacking for seismic data. The resistivity pseudosection that showed low-resistivity zones indicates presence of water-saturated formations, while seismic section showed a structural feature despite weak reflections due to acoustic impedance. A reduction in velocity trend were observed during velocity picking which was interpreted due to pile of gravel. Integration of these two methods have shown their reciprocal strengths, which the resistivity method were used to validate near-surface seismic anomalies, helping in interpretation. This study highlights the implications of integrating these methods for groundwater exploration, which cross-validation can be used to improve processing workflow. However, integrated interpretation could not be conducted due to discrepancy in depth of acquisition result. Recommendations for future work in this area are minimizing seismic trigger delays, extending the resistivity survey coverage, and using higher-energy seismic sources to improve the quality of the data.
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Studi ini berfokus pada integrasi metode resistivitas dan seismik untuk eksplorasi air tanah di Kinta Valley, Perak, khususnya di Universiti Teknologi PETRONAS. Groundwater merupakan sumber daya yang sangat penting dan memerlukan akuisisi geofisika yang tepat untuk dieksplorasi. Metode resistivitas, menggunakan konfigurasi Wenner-Schlumberger, dipilih untuk memetakan variasi resistivitas bawah permukaan guna mengidentifikasi water-bearing zone. Secara bersamaan, metode seismic reflection diterapkan untuk menentukan batas dan struktur geologi. Desain tata letak akuisisi dan parameter untuk kedua metode dioptimalkan untuk meningkatkan kualitas data, meskipun terdapat keterbatasan seperti ruang yang terbatas dan noise. Alur kerja pemrosesan data yang sesuai telah dilakukan untuk meningkatkan pencitraan bawah permukaan, termasuk inversion modelling untuk data resistivitas dan stacking untuk data seismik. Pseudosection resistivitas menunjukkan zona low-resistivity yang mengindikasikan keberadaan water-saturated formation, sementara seismic section menunjukkan suatu fitur struktur meskipun terdapat weak reflections akibat acoustic impedance. Teramati tren penurunan velocity selama velocity picking yang diinterpretasikan disebabkan oleh tumpukan gravel. Integrasi kedua metode ini menunjukkan keunggulan saling melengkapi, di mana metode resistivitas digunakan untuk memvalidasi anomali seismik near-surface, sehingga membantu dalam interpretasi. Studi ini menyoroti implikasi integrasi kedua metode untuk eksplorasi air tanah, di mana cross-validation dapat digunakan untuk meningkatkan workflow pemrosesan. Namun, interpretasi terintegrasi tidak dapat dilakukan karena perbedaan kedalaman hasil akuisisi. Rekomendasi untuk pekerjaan selanjutnya di area ini adalah meminimalkan seismic trigger delays, memperluas cakupan survei resistivitas, dan menggunakan seismic sources berenergi lebih tinggi untuk meningkatkan kualitas data.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	hydrology, electrical resistivity tomography, seismic reflection, Hidrologi, tomografi resistivitas listrik, seismic refleksi
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA1637 Image processing--Digital techniques. Image analysis--Data processing.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Alexander Zulkarnaen Ashari
Date Deposited:	08 Aug 2025 06:52
Last Modified:	08 Aug 2025 06:52
URI:	http://repository.its.ac.id/id/eprint/127687

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