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The Multichannel Analysis of Surface Waves Method (MASW): Brief Theory and Application to Near Fault Zone Identification Handoyo, Handoyo
Jurnal Lingkungan dan Bencana Geologi Vol 15, No 1 (2024)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v15i1.493

The characterisation of near subsurface geological features such as sedimentary layer thickness distribution andnear-surface geological structures are interest and continues to be studied to understand the complete conditions in thesubsurface. One geophysical method that can be used for characterising shallow targets is the Multichannel Analysisof Surface Waves (MASW) method. The MASW method is a method that utilises the dispersive nature of surface wavesto model the shear wave velocity distribution in each layer vertically (Vs-depth model). The MASW method consists ofthree stages: acquisition, processing, and inversion. In this paper, we describe the general concept/theory of MASWand its application to characterise a shallow fault zone at a target depth of about 150 m in the active zone, IberianPeninsula, Spain. This study is supported by trenches data as a marker for the fault plane in the study area. Basedon the study and results obtained in this paper, it is hoped that it can provide a brief theory regarding the MASWmethod for the benefit of learning and advancing science and technology in Indonesia. Moreover, it is also hopedthat the application of the MASW method in Indonesia will continue to develop and can be used with wider interests.

A Kontribusi Geofisika dalam Eksplorasi Hidrogen Geologis (Geologic Hydrogen) di Bawah Permukaan Handoyo, Handoyo
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 6 No. 1 (2025): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar

Transisi energi ke sumber energi yang lebih ramah lingkungan sangat penting untuk mengurangi emisi karbon di atmosfer bumi. Di antara jenis energi baru yang ramah lingkungan, terdapat peningkatan kesadaran akan potensi hidrogen (H2) geologis yang terbentuk secara alami sebagai sumber energi primer yang dapat dimasukkan ke dalam pasokan energi pada masa depan. Geofisika diperkirakan akan memainkan peran penting dalam upaya tersebut. Ada dua jenis H2 geologis yang berbeda yaitu H2 alami (gold H2) yang secara konsep terakumulasi secara alami di reservoir dalam kondisi geologi tertentu. Selanjutnya adalah H2 terstimulasi (orange H2) yang diproduksi secara artifisial dari batuan sumber melalui stimulasi kimia dan fisika. Pada paper ini, kami akan membahas peranan geofisika dalam eksplorasi H2 geologis sebagai perbandingan yang kontras dengan skenario H2 biru dan hijau (blue and green H2). Kemudian, akan dibahas pentingnya metode geofisika pada eksplorasi H2 alami dan H2 terstimulasi baik dalam hal teknik eksplorasi dan pemantauan (monitoring). Dengan memberdayakan berbagai instrumen dan metode-metode geofisika terintegrasi dalam eksplorasi dan produksi hidrokarbon yang sudah ada, diharapkan dapat diperoleh gambaran mengenai peranan geofisika dalam eksplorasi H2 secara efektif. Secara umum, strategi eksplorasi H2 akan melibatkan peralihan sudut pandang dari pendekatan yang berpusat pada reservoir ke pendekatan yang berpusat pada batuan sumber. Terakhir, kami yakin bahwa metode geofisika yang melibatkan integrasi multi-geofisika, akuisisi data yang efisien, dan pembelajaran mesin dalam H2 geologis berpotensi memberikan pemahaman baru dan peluang signifikan untuk melanjutkan penelitian dalam beberapa mendatang.

Study of Porosity and Mechanical-Elastic Properties of the Potential Underground CO2 Storage in Un-Mined Coal Seams from Well-log Data, South Sumatra Basin, Indonesia Handoyo, Handoyo; Sigalingging, Asido Saputra; Nathania, Edlyn Yoadan; Astomo, Dimas; Carbonell, Ramon; Samosir, Sondang
Science and Technology Indonesia Vol. 10 No. 1 (2025): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.1.238-249

In CO2 storage technology, particularly in coal seams, necessitates specialized research into numerous critical factors that are equivalent to coal seam characteristics, including porosity, permeability, rock strength (UCS: uniaxial compressive strength), Poisson ratio, and brittleness. Rock properties of the coal seam are responsible for the CO2 storage capacity. In this study, we have core samples from the borehole and employed four well-logs (within and area ∼ 1000 m × 875 m) that drilled in the coal mining project located in South Sumatra Basin, Indonesia. The goal of this study is to describe the coal seam C strata in the sub-surface that have the potential to be utilized for underground CO2 storage. In this study, we identified coal seams C from low density and gamma rays from log response data. Then, we predict porosity values from data density, velocity (Vp andVs), UCS values, and BI using petrophysical and rock physics approaches. The result of this study shows that the distribution of top depth coal seam C varies in depth 19 to 225 m with the porosity 0.086-0.138. The value of UCS 1150 1299 Pa and brittleness index 0.531-0.569 that are associated with a characteristic coal with low to medium strength and medium brittleness. The results of this preliminary analysis revealed that the coal seam layer in this region has a high potential for CO2 storage in Sumatra, Indonesia.

KARAKTERISASI BATUAN INDUK HIDROKARBON DAN RESERVOAR NONKONVENSIONAL DI CEKUNGAN JAWA TIMUR BAGIAN UTARA: CHARACTERIZATION OF HYDROCARBON SOURCE ROCKS AND UNCONVENTIONAL RESERVOIR IN THE NORTHERN EAST JAVA BASIN Airlangga, Feby; Handoyo, Handoyo; Irawati, Selvi Misnia; Wibowo, Andy Setyo
Buletin Sumber Daya Geologi Vol 19 No 3 (2024): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v19i3.435

The northern East Java Basin is one of the hydrocarbon producing basins in Indonesia with a thick source rock layer and is interesting to study as a potential unconventional reservoir in the future. In this research, integration of well data analysis and seismic inversion is used to identify the characteristics of the source rock in the studied area. Well data analysis can provide lithological information from the source rocks bearing formations, namely shale of the Prupuh Formation, dominant shale of the Kranji Formation, and limestone of the Ngimbang Formation. In addition, log data can provide information on predicting Brittleness Index (BI) and Total Organic Carbon (TOC) values in the target zone. The linear regression is used to propagate BI, porosity, and TOC on the seismic data. To assist the process of distributing TOC and BI values on seismic parameters, Acoustic Impedance (AI) inversion was carried out by using a model based hard constraint method to predict the AI distribution. The results of this study show that the target zone is a potential zone with a medium to potential category with a TOC distribution of 1.5%-2.2%, BI of 0.2-0.46, and porosity of 0.03-0.15. Moreover, seismic inversion data also helps the distribution of petrophysical parameters in good lateral conditions following the distribution of shale source rock horizons.

Aplikasi Teknik Poro-Acoustic Impedance untuk Meningkatkan Korelasi Pengikatan Data Sumur dan Penampang Seismik Handoyo, Handoyo; Samuel, Brian; Samosir, Sondang
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 6 No. 1 (2025): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v6i1.519

Pada tahap interpretasi seismik refleksi, pengikatan data sumur dengan data seismik (well seismic tie) merupakan tahapan krusial untuk memastikan lokasi target eksplorasi sudah tepat. Secara konvensional, proses ini melibatkan parameter-parameter fisis seperti densitas, kecepatan gelombang -P, impedansi akustik atau Acoustic Impedance (AI), dan koefisien refleksi. Hasil dari konvolusi koefisien refleksi dengan suatu wavelet, menghasilkan seismogram sintetik yang digunakan untuk mengikat data seismik. Pada penelitian ini, kami menerapkan teknologi baru dalam tahapan interpretasi seismic refleksi yang disebut Poro-Acoustic Impedance (PAI). Metode PAI menggunakan konsep porositas yang seharusnya terlibat dalam perumusan nilai Acoustic Impedance sehingga dapat merepresentasikan kondisi batuan secara aktual. Pada penelitian ini, kami menggunakan data seismik 2D dari lapangan migas di Laut Utara disertai dengan satu data sumur (well) yang digunakan sebagai marker dan analisis PAI. Hasil penelitian ini menunjukkan bahwa terjadi peningkatan korelasi pengikatan data sumur dengan data seismik dari 0.789 ketika menggunakan metode AI menjadi 0.834 ketika menggunakan metode PAI. Peningkatan ini berimplikasi pada proses picking yang lebih efektif dan akurat. Dengan demikian, metode PAI dapat menjadi metode baru yang simpel dan efektif untuk mengurangi ketidakppastian pada proses pengikatan data sumur dengan data seismik, sehingga batas-batas formasi batuan dapat tercitrakan dengan lebih baik.

Penerapan Metode Multichannel Analysis of Surface Waves (MASW) untuk Interpretasi Bawah Permukaan sebagai Kontribusi Pembangunan Infrastruktur di Ibu Kota Nusantara (IKN) Handoyo, Handoyo; Alfatih, Zhilan Zhalilla Puti; Ruchimat, Acep; Wiyono, Wiyono; Akin, Ã–zgenÃ§; Andika, Putu Pradnya
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 6 No. 3 (2025): Agustus
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v6i3.1187

Ibu Kota Nusantara (IKN), yang akan ditetapkan sebagai pusat pemerintahan baru Indonesia di Kalimantan Timur, saat ini berada dalam tahap awal pengembangan infrastruktur yang mencakup kebutuhan mendasar seperti transportasi, utilitas publik, dan fasilitas penunjang lainnya. Kawasan Ibu Kota Nusantara (IKN) menuntut kajian geoteknik yang komprehensif untuk menjamin daya dukung tanah dan stabilitas struktur jalan tol. Untuk mendukung perencanaan dan pelaksanaan konstruksi secara aman dan efisien, pemahaman mengenai karakteristik geoteknik lapisan bawah permukaan menjadi sangat penting. Metode Multichannel Analysis of Surface Waves (MASW) merupakan salah satu pendekatan geofisika non-destruktif yang efektif dalam mengidentifikasi distribusi kecepatan gelombang geser (Vs). Prosedur MASW mencakup akuisisi data seismik, transformasi Fourier, pembentukan kurva dispersi frekuensi-kecepatan, serta inversi untuk menghasilkan distribusi Vs secara vertikal dan lateral. Berdasarkan distribusi nilai Vs, hasil analisis menunjukkan bahwa kecepatan gelombang geser di lokasi penelitian terdiri dari 4 lapisan utama, yaitu clay atau tanah lempung lunak (140-150 m/s), silty clay (150-200 m/s), medium to dense sands (200-400 m/s) dan gravels (>400 m/s). Analisis Vs yang dihasilkan memberikan informasi kritis untuk menentukan fondasi dapat dibangun sekiranya pada kedalaman >10 m. Dengan demikian, penerapan MASW diproyeksikan mampu menjembatani kesenjangan data geoteknik dan mendukung perencanaan konstruksi jalan tol di IKN secara lebih efektif dan efisien.

KARAKTERISASI BATUAN INDUK HIDROKARBON DAN RESERVOAR NONKONVENSIONAL DI CEKUNGAN JAWA TIMUR BAGIAN UTARA: CHARACTERIZATION OF HYDROCARBON SOURCE ROCKS AND UNCONVENTIONAL RESERVOIR IN THE NORTHERN EAST JAVA BASIN Airlangga, Feby; Irawati, Selvi Misnia; Wibowo, Andy Setyo; Handoyo, Handoyo
Buletin Sumber Daya Geologi Vol 19 No 3 (2024): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v19i3.435

The northern East Java Basin is one of the hydrocarbon producing basins in Indonesia with a thick source rock layer and is interesting to study as a potential unconventional reservoir in the future. In this research, integration of well data analysis and seismic inversion is used to identify the characteristics of the source rock in the studied area. Well data analysis can provide lithological information from the source rocks bearing formations, namely shale of the Prupuh Formation, dominant shale of the Kranji Formation, and limestone of the Ngimbang Formation. In addition, log data can provide information on predicting Brittleness Index (BI) and Total Organic Carbon (TOC) values in the target zone. The linear regression is used to propagate BI, porosity, and TOC on the seismic data. To assist the process of distributing TOC and BI values on seismic parameters, Acoustic Impedance (AI) inversion was carried out by using a model based hard constraint method to predict the AI distribution. The results of this study show that the target zone is a potential zone with a medium to potential category with a TOC distribution of 1.5%-2.2%, BI of 0.2-0.46, and porosity of 0.03-0.15. Moreover, seismic inversion data also helps the distribution of petrophysical parameters in good lateral conditions following the distribution of shale source rock horizons.

Characterization of Carbonate Reservoir Potential in Salawati Basin, West Papua: Analysis of Seismic Direct Hydrocarbon Indicator (DHI), Seismic Attributes, and Seismic Spectrum Decomposition Handoyo, Handoyo; Ronlei, Bernard Cavin; Sigalingging, Asido Saputra; Avseth, Per; Triyana, Endra; Akin, Özgenç; Young, Paul; Alcalde, Juan; Carbonell, Ramon
Indonesian Journal on Geoscience Vol. 11 No. 2 (2024)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.11.2.173-188

Carbonate reservoir of Kais Formation in Salawati Basin, West Papua, is the most famous oil and gas reservoir in the eastern part of Indonesian Archipelago since 1970’s. Nowadays, new prospects in this area are more challenging and most relevant near the infrastructure of previous oil and gas fields. In this study, a relatively new seismic dataset was investigated to figure out new prospects in carbonate reservoir rocks in the area of interest. In this preliminary study, where seismic data are not supported by well data, direct hydrocarbon indicator (DHI), seismic attribute, and spectral decomposition (CWT: continuous wavelet transform) allow the authors to characterize the reservoir geometry and to predict pore fluids within the reservoir rocks. The reservoir geometry of carbonate reef of Kais Formation (C1) was identified by seismic reflectors with high amplitude contrast at the top C1. The hydrocarbon indicator was predicted by DHI where dim spots, flat spots, and polarity reversals are indicative of hydrocarbon prospects. From the attribute analysis, the attribute instantaneous amplitude detected the top carbonate C1, whereas pore fluids were predicted from high sweetness attribute. In addition, spectral decomposition CWT method confirms the top C1, identified as saturated rock by the frequency of 10 Hz, 20 Hz, and 30 Hz. Based on a seismic study in the researched area, the target zone is expected to be a very promising hydrocarbon reservoir, specifically a carbonate reservoir. As a result, the preferred well-test location is in a region with access to the Kais Formation limestone reef layer. This study can assist in reservoir characterization, especially in areas with limited well control.

Geotechnical Parameters Determination by Using Seismic Refraction Tomography in The New Capital City of Indonesia, Nusantara: Implication to Analysis of Soil Compaction Handoyo, Handoyo; Amalia, Atika; Sigalingging, Asido Saputra; Ruchimat, Acep; Wiyono, Wiyono; Akin, Özgenç
Indonesian Journal on Geoscience Vol. 12 No. 3 (2025)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.12.3.423-435

The new capital city of Indonesia, Nusantara, in East Kalimantan, is undergoing enormous infrastructural development in Indonesia. Understanding the condition of the soil, sediment, and hardrock layers at this location is critical for geotechnical working principles. In this study, the first arrival P-wave tomography method was used to determine the distribution of P-wave velocity and geotechnical parameters (e.g. porosity, density, void ratio) to better understand the condition of the rock layers at this location. This study involved the use of seismic refraction tomography data consisting of forty-eight channels with a distance between geophones of 1 m, and a source in the form of a sledgehammer weighing 3 kg with a separation distance of 3 m. The natural frequency of the geophones used was 4.5 Hz with a recording time of 1.0 sec. Results of this investigation reveal a thinning hardrock layer from the south to the north, with a thickness ranging from 7 to 16 m correlated to consolidated alluvium. Moreover, the geotechnical parameter of sediment layers, top soil (clayey soil) and unconsolidated alluvium, has a density value range from 1.6 to 1.8 g/cm³, porosity 0.31 to 0.38, and void ratio 0.44 to 0.59. These findings show that the soil layer in the south to the middle of line profile of the studied area has low to medium compaction, requiring soil hardening activities (mechanical compaction) for infrastructure construction. Finally, the findings of this study are expected to help with infrastructure development in the IKN by utilizing geophysical technique.

Reservoir Characterization of the Hugin Formation, Volve Field Norway, Using Integrated Seismic Inversion and Multiattribute Analysis Based on a Probabilistic Neural Network (PNN) Kartika, Amelia; Handoyo Handoyo; Asido Saputra Sigalingging; Farizki Budi Pangestu; Husain, Mochammad Wafa
ARRUS Journal of Engineering and Technology Vol. 5 No. 2 (2025)
Publisher : PT ARRUS Intelektual Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35877/jetech4411

Akuisisi seismik 3D di Lapangan Volve, yang terletak di Cekungan Laut Utara, Norwegia, dilakukan untuk mengeksplorasi potensi hidrokarbon Formasi Hugin, yang diendapkan selama era Mesozoikum. Dataset yang dianalisis terdiri dari data seismik migrasi waktu pasca-tumpukan 3D dan data log sumur (sonik, densitas, dan porositas) untuk mendukung proses interpretasi. Penelitian ini bertujuan untuk mengkarakterisasi zona reservoir melalui integrasi inversi seismik Impedansi Akustik (AI) dan analisis multiatribut menggunakan metode Jaringan Syaraf Tiruan Probabilistik (PNN). Inversi seismik digunakan untuk menghasilkan penampang AI yang merepresentasikan variasi sifat fisik batuan, sementara analisis multiatribut berbasis PNN digunakan untuk memprediksi distribusi log porositas dari data seismik secara nonlinier. Hasil penelitian menunjukkan bahwa reservoir batupasir di dalam Formasi Hugin memiliki nilai AI berkisar antara 7000 hingga 8000 (g/cc·m/s) dan nilai porositas antara 0,15 hingga 0,30 (v/v). Integrasi kedua metode ini terbukti efektif dalam meningkatkan resolusi karakterisasi reservoir dan mendelineasi zona prospek hidrokarbon di Lapangan Volve. Kata kunci: Formasi Hugin, inversi impedansi akustik, karakterisasi reservoir, jaringan saraf probabilistik, refleksi seismik.

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