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All Journal Jurnal Tecnoscienza Scientific Contributions Oil and Gas
Dasapta Erwin Irawan
Institut Teknologi Bandung
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Energy Engineering Mathematics Other

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Integrating DT Sonic and RMS Velocity As Dual Indicators for Overpressure and Fluid Screening in The Lower Seurula Formation of The Rayeu Field, North Sumatra Basin Pramuditya Dwi Permana; Dasapta Erwin Irawan; Agus Mochamad Ramdhan
Scientific Contributions Oil and Gas Vol 49 No 2 (2026)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v49i2.2108

Abstract

Velocity anomalies are widely used as indicators of Overpressure and hydrocarbon presence in clastic sedimentary basins. However, seismic and sonic velocity responses are inherently non-unique because similar anomalies may result from unloading Overpressure, lithological variation, or fluid-related effects. This ambiguity becomes significant within the Lower Seurula Formation of the Rayeu field, North Sumatra Basin, where several wells exhibit varying production performance despite comparable velocity responses.This study proposes an integrated interpretation framework combining residual DT sonic (∆DT) and residual RMS velocity (∆VRMS) as dual indicators for Overpressure and fluid screening. The workflow integrates well log analysis, seismic-derived RMS velocity, interval velocity evaluation, clay transformation interpretation, and Fluid Replacement Modeling (FRM).Results indicate that the Lower Seurula Formation is dominated by unloading-related Overpressure, supported by persistent DT sonic deviation, interval velocity reversal, and evidence of smectite-illite transformation. FRM analysis demonstrates that gas saturation significantly reduces P-wave velocity and may generate responses similar to Overpressure anomalies. Wells exhibiting elevated ∆DT and strongly negative ∆VRMS responses generally correspond to better production performance.These findings demonstrate that integrating residual DT sonic and residual RMS velocity reduces interpretation ambiguity between unloading-related Overpressure and hydrocarbon-related fluid effects. The proposed workflow provides a practical approach for early-stage fluid screening and Overpressure evaluation in clastic sedimentary basins.
Pemetaan Pola Aliran Air Tanah di Sekitar Kali Sumpil Kota Malang Mukhlis Arief Irvandi; Hari Siswoyo; Dasapta Erwin Irawan
JURNAL TECNOSCIENZA Vol. 6 No. 2 (2022): JURNAL TECNOSCIENZA
Publisher : JURNAL TECNOSCIENZA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51158/tecnoscienza.v6i2.717

Abstract

Penelitian ini dilakukan dengan tujuan untuk memetakan pola aliran air tanah di sekitar Kali Sumpil di wilayah Kota Malang. Lokasi penelitian ini adalah di segmen Kali Sumpil sepanjang 5,6 km yang mengalir mulai dari Kecamatan Lowokwaru hingga ke pertemuan antara Kali Sumpil dan Kali Sari di Kecamatan Blimbing, Kota Malang. Pola aliran air tanah di lokasi penelitian dipetakan berdasarkan elevasi muka air tanah yang diukur dari 43 lokasi sumur gali milik warga yang tersebar di sepanjang aliran Kali Sumpil tersebut. Elevasi muka air tanah pada sumur gali warga di lokasi penelitian berkisar antara +493,88 m dpl di bagian hulu hingga +436,70 m dpl di bagian hilir. Elevasi muka air tanah tertinggi berada pada sumur gali SG-26 yang berada di sebelah kanan aliran bagian hulu Kali Sumpil, sedangkan elevasi muka air tanah terendah berada pada sumur gali SG-25 di sebelah kiri aliran bagian hilir Kali Sumpil. Secara umum, aliran air tanah di lokasi penelitian mengalir dari arah Barat Laut menuju ke arah Tenggara bersesuaian dengan arah aliran Kali Sumpil. Hubungan antara air tanah dan air permukaan adalah air tanah mengisi air permukaan Kali Sumpil.
Co-Authors Agus Mochamad Ramdhan hari siswoyo Mukhlis Arief Irvandi Pramuditya Dwi Permana