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All Journal Jurnal Fisika Unand Jurnal Spektra Journal of Physics: Theories and Applications Jurnal Hilirisasi IPTEKS (JHI) Jurnal Ilmu Fisika INTEGRITAS : Jurnal Pengabdian BERNAS: Jurnal Pengabdian Kepada Masyarakat Indonesian Journal of Community Empowerment and Service
Elistia Liza Namigo, Elistia
Departemen Fisika, Universitas Andalas
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ATENUASI MULTIPLE PADA DATA SEISMIK 2D CEKUNGAN BRYANT CANYON LEPAS PANTAI TELUK LOUISIANA TEXAS Ade Saputra; Elistia Liza Namigo
Jurnal Fisika Unand Vol 4 No 4: Oktober 2015
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (130.265 KB) | DOI: 10.25077/jfu.4.4.%p.2015

Abstract

ABSTRAKTelah dilakukan atenuasi multiple berbasis Seismic Unix pada data seismik 2D laut dalam (3000- 5000 meter) pada cekungan Bryant Canyon lepas pantai teluk Louisiana Texas. Atenuasi dilakukan pada empat line seismik dengan metode Predictive Deconvolution, Transformasi Radon, dan kombinasi Predictive Deconvolution dengan Transformasi Radon atau disebut TauP Deconvolution. Penelitian ini ditujukan untuk mengetahui efektifitas ketiga metode dalam mengatenuasi multiple pada data seismik laut dalam dengan struktur geologi kompleks. Pada keempat line seismik tersebut teridentifikasi water-bottom, peg-leg, dan intrabed multiple. Metode Predictive dan TauP Deconvolution efektif digunakan untuk menghilangkan peg-leg, intrabed multiple, dan multiple di sekitar kubah garam (pada line 3) namun tidak dapat mengatenuasi water-bottom multiple. Kedua metode juga berhasil meningkatkan signal to noise ratio serta memperbaiki dead trace. Metode Transformasi Radon terbukti tidak efektif untuk mengatenuasi multiple laut dalam dengan morfologi yang kompleks.Kata Kunci :   Multiple, Predictive Deconvolution, Transformasi Radon, TauP Deconvolution.AbstractSeismic Unix based - multiple attenuation has been performed on 2D seismic data on deep ocean (3000-5000 metres) of Bryant Canyon basins offshore Louisiana Gulf Texas. Attenuation was performed on four seismic lines by Predictive Deconvolution, Radon Transform, and the combination of Predictive Deconvolution and Radon Transform or called the TauP Deconvolution methods. This study aimed to find out the effectiveness of the three methods in multiple attenuation on marine seismic data in structure geological complex. Water-bottom, peg-leg, and intrabed multiples were identified in the four seismic lines. Predictive Deconvolution method and TauP Deconvolution methods are effective for removing peg-leg, intrabed and salt-related multiples (identified on seismic line 3) but the two methods fail to attenuate water-bottom multiples. The two methods have also successfully enhanced signal to noise ratio and fixed the dead traces. Radon transform method was prooped to be in effective for deep water and complex structure multiple elimination. Keywords :  Multiple, Predictive Deconvolution, Radon Transform, TauP Deconvolution.
Pemetaan Magnitude of Completeness (Mc) untuk Gempa Sumatera Jenny Teresia Simamora; Elistia Liza Namigo
Jurnal Fisika Unand Vol 5 No 2 (2016)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (256.567 KB) | DOI: 10.25077/jfu.5.2.179-186.2016

Abstract

Telah dilakukan estimasi nilai Mc, nilai-b dan nilai-a menggunakan data gempa bumi dari katalog USGS (United States Geological Survey) dari Januari 1970 sampai Maret 2015 dengan batas 90°BB - 106°BB dan 6°LU - 6°LS dengan skala magnitudo Mw≥4 SR sampai 9 SR pada kedalaman maksimum 300 km yang meliputi wilayah Sumatera dan Samudera Hindia. Dalam penelitian ini digunakan Software ZMAP under MATLAB. Estimasi Mc dilakukan secara spasial dan temporal dengan menggunakan dua metoda yaitu metoda MAXC dan EMR. Variasi nilai Mc secara spasial kemudian dipetakan dengan bin size 250 secara spasial dan secara temporal persepuluh tahun untuk melihat evolusi nilai Mc selama empat dekade terakhir. Dari analisis diatas, diperoleh Mc sekitar 4,2 SR sampai 5,6 SR (nilai Mc rata-rata adalah 4,6 SR), Nilai-b berkisar 0,6 sampai 1,1 dan variasi nilai-a berkisar 5 sampai 7,5. Berdasarkan pemetaan nilai Mc, Sumatera bagian utara dan daerah lepas pantai barat Sumatera memiliki nilai Mc yang rendah yaitu (4.6-4,9) SR. Ini menandakan bahwa data gempa untuk daerah-daerah tersebut cukup lengkap di banding daerah lain. Berdasarkan pemetaan nilai-b dan nilai-a, wilayah yang memiliki tingkat kegempaan yang relatif tinggi dan memiliki potensi gempa-gempa besar adalah wilayah Aceh, Simeulue, Nias, Mentawai dan sekitar Bengkulu. Variasi Mc secara temporal relatif menurun selama empat dekade terakhir. Hal ini menunjukkan bahwa kemampuan perekaman data gempa relatif baik.Kata Kunci: pemetaan Mc, nilai-b, nilai-a, MAXC, EMR.
Karakterisasi Reservoar Hidrokarbon Menggunakan Atribut Energi dan Metode Seismic Coloured Inversion (SCI) Pada Lapangan Penobscot Kanada Jarnal Witarsa; Dwi Pujiastuti; Elistia Liza Namigo
Jurnal Fisika Unand Vol 8 No 2 (2019)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (641.718 KB) | DOI: 10.25077/jfu.8.2.113-119.2019

Abstract

Telah dilakukan karakterisasi reservoar hidrokarbon pada Lapangan Penobscot Kanada menggunakan atribut energi dan  metode Seismic Coloured Inversion (SCI) di sepanjang inline 1284 m. Penelitian ini menggunakan data seismik post stack sebagai data input dan data sumur sebagai data kontrol untuk menentukan nilai impedansi akustik (AI). Analisis sensitivitas log yang digunakan menunjukkan bahwa gamma ray log lebih sensitif dalam pemisahan lapisan sand dan shale. Analisis atribut energi dilakukan untuk meningkatkan resolusi vertikal dari penampang seismik untuk menentukan zone of interest. Analisis inversi SCI dilakukan untuk melihat pola sebaran nilai AI pada penampang seismik yang diteliti. Dari hasil inversi SCI terhadap penampang seismik diperoleh nilai AI antara 2,00 x 106 kg/m2s sampai 5,56 x 106 kg/m2s. Hal ini menunjukkan bahwa pada penampang seismik yang diteliti terdapat potensi reservoar hidrokarbon.Kata kunci: atribut energi, Seismic Coloured Inversion (SCI), Acoustic Impedance (AI), Zone Of Interest.
Karakterisasi Reservoar Menggunakan Metode Inversi Impedansi Akustik Model Based pada Lapangan “OVI” Cekungan Sumatera Tengah Ovina Aisyah; Elistia Liza Namigo; Muhammad Subhan
Jurnal Fisika Unand Vol 13 No 1 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.1.146-152.2024

Abstract

Telah dilakukan penelitian tentang karakterisasi reservoar menggunakan metode inversi impedansi akustik menggunakan software Hampson-Russel dan Petrel pada Lapangan “OVI” Cekungan Sumatera Tengah Formasi Telisa. Penelitian ini bertujuan untuk memperkirakan karakter fisis reservoar berdasarkan persebaran porositas dan volume shale. Daerah yang berpotensi terhadap hidrokarbon diidentifikasi menggunakan metode inversi impedansi akustik model based. Data yang digunakan adalah data seismik 3D Post-Stack Time Migration (PSTM) dan data tujuh sumur (OV1, OV2, OV5, OV12, OV16, OV31, dan OV32) terdiri dari sonic log, density log, porosity log, dan gamma ray log. Hasil dari inversi model based menujukkan nilai impedansi akustik sand berkisar dari 9,670 ft/s*gr/cc hingga 27,070 ft/s*gr/cc.
Identifikasi Bidang Gelincir Zona Rawan Longsor di Kawasan Wisata Puncak Taruko Kabupaten Agam Menggunakan Metode Geolistrik Resistivitas Husnatul Fauzana; Elistia Liza Namigo
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.644-650.2024

Abstract

A research has been conducted to identify the surface of rupture plane in Puncak Taruko area, Agam Regency, West Sumatra Province using 2-dimensional resistivity geoelectric method of Wenner-Schlumberger Configuration. Data collection was carried out on three tracks with track lengths of 80, 100 and 100 m and 5 m electrode spacing. The research area is a plateau with a slope of up to 40º which is directly adjacent to the very steep cliffs of Sianok Canyon with a cliff height of 30-100m. Data processing was carried out using Res2dinv software to display a 2-dimensional image of the subsurface layer structure based on the resistivity values measured in the field. In the cross section of the mapping results in the three tracks, 4 rock layers were identified, namely clay, sand, tuff and granite. The interpretation results show that the sliding plane on each track is tuff. For Track 1 with a depth of 3,75-15,9m, for track 2 it is 5,15-19,8 m and a depth of 6,38-19,8 m for track 3. Based on the interpretation of 2D image results, the area of track 1 and 2 has a translational avalanche type and the area of track 3 has a rotational avalanche type. Based on the depth and thickness of the slide field, the greatest risk of landslide is on track 3.
Investigasi Bidang Gelincir Zona Rawan Longsor dengan Metode Geolistrik di Sekitar Kawasan Wisata Panorama Bukittinggi Mifthahul Putri; Elistia Liza Namigo
Jurnal Fisika Unand Vol 13 No 6 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.6.742-748.2024

Abstract

The investigation of the slip plane in the landslide-prone area around Taman Panorama, Kayu Kubu, Bukittinggi City has been conducted using the 2-dimensional resistivity geoelectric method with Wenner configuration.The study was carried out on hills with a slope of 40°. Data collection was conducted along three tracks with lengths of 80, 70, and 70 meters respectively. Data processing was done using Res2dinv software to display a 2-dimensional image of subsurface layers based on the measured resistivity values in the field. The interpretation of the data results showed the presence of slippage zones along each track in the form of an volcanic breccia rock layer. For line AB, resistivity values range from 250 to 813 Ωm at depths of 3.75 - 15.9 meters. Line CD has resistivity values ranging from 137 to 375 Ωm at depths of 3.75 - 15.9 meters, while track EF had resistivity values range from 183 – 287 Ωm at depths of 6.38 – 9.25 meters. Based on the depths, the identified slip surfaces are categorized as quite deep, thus this area is classified as a landslide-prone zone.
Penentuan Sebaran Reservoar Menggunakan Atribut Seismik Pada Lapangan “Cemara” Cekungan Sumatera Tengah, Riau Zalwi, Eka Nadila; Namigo, Elistia Liza; Azlin, Amalia
Jurnal Fisika Unand Vol 14 No 1 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.1.75-81.2025

Abstract

A research has been carried out to determine the distribution of reservoirs in the "Cemara" Field, Riau using the seismic attribute method. The data used is secondary data resulting from the acquisition of PT. Bumi Siak Pusako in the form of 3D Post-Stack Time Migration (PSTM) seismic data and well data. Seismic attribute analysis is carried out by changing the original seismic volume into a sweetness seismic volume, then extracting the RMS (Root Mean Square), average energy and instantaneous frequency seismic attributes. The results of the RMS and average energy attribute map analysis show that the reservoir distribution area has a high amplitude with attribute values ​​of 2.0-3.2 and 7.0-11.00 respectively, which are high values ​​for each attribute. The results of the instantaneous frequency attribute show that the reservoir distribution area is at low frequency with an attribute value of 12.5-0.00. The crossplot of the attribute with the net sandstone layer value shows a higher distribution of clean sandstone in the production well area. The cross plot of attributes with vshale values ​​shows lower values ​​in the production well area, indicating that the reservoir distribution around the production well has good porosity. The reservoir distribution zone is in the altitude zone with a depth of ± 1,830 feet in the west and northeast directions, represented by the sweetspot zone in the amplitude attribute.
Pemetaan Zona Rawan Longsor di Kawasan Agam-Bukittinggi Berbasis Google Earth Engine Menggunakan Teknik Evaluasi Multi-Kriteria Hilalliyah, Nisful; Namigo, Elistia Liza
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.242-248.2025

Abstract

Landslide vulnerability zone mapping with Google Earth Engine (GEE) has been conducted through a multi-criteria evaluation technique that encompasses scoring, categorization, and overlay of five landslide characteristics in the Agam and Bukittinggi regions of West Sumatra. The criteria utilized are slope, rainfall, land usage, rock type, and soil type. The supervised classification technique employing a random forest classifier is utilized to generate land use categorization maps. The mapping results indicate that the Agam-Bukittinggi region is predominantly characterized by a high to very high degree of landslide susceptibility, encompassing 77,5% (1680,55 km2) of the overall research area, with a medium level of vulnerability. Regions exhibiting high to very high susceptibility to landslides including Tanjung Raya District, Matur District, Malalak District, IV Koto District, Palupuh District, Palembayan District, Tilatang Kamang District, Ampek Angkek District, Kamang Magek District, Banuhampu District, Matur District, Sungai Pua District, Candung District, Baso District and Bukittinggi City. Simultaneously, there exists a 22% risk of moderate landslides in Ampek Nagari District, Lubuk Basung, and Tanjung Mutiara Districtsis.
PRE-STACK TIME MIGRATION (PSTM) BERBASIS SEISMIC UNIX PADA DATA SEISMIK 2D CEKUNGAN BRYANT CANYON LEPAS PANTAI TELUK LOUISIANA TEXAS Yenti, Vivi Lispa; Namigo, Elistia Liza
Jurnal Fisika Unand Vol 4 No 1: Januari 2015
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.4.1.%p.2015

Abstract

ABSTRAKTelah dilakukan pre-stack time migration (PSTM) berbasis Seismic Unix pada data 2D cekungan Bryant Canyon lepas pantai teluk Louisiana Texas. Penelitian ini menggunakan data Marmousi sebagai data uji untuk menentukan metode migrasi paling tepat. Dari hasil pengujian, metode Phase Shift, Finite-Difference dan Kirchhoff dipilih sebagai metode yang diterapkan pada data Bryant Canyon pada line 9 dan 12 yang diidentifikasi memiliki struktur kompleks (sinklin, patahan dan salt body) dan mengandung banyak noise (bowtie, difraksi dan multiple). Metode Phase Shift baik digunakan pada struktur yang memiliki kemiringan di atas 90Ëš sedangkan metode Finite-Difference mampu menangani variasi kecepatan horizontal dengan kemiringan yang terbatas. Metode Kirchhoff efektif menghilangkan pola-pola difraksi sehingga struktur yang ada pada penampang seismik terlihat jelas. Dari penelitian ini terlihat bahwa struktur bawah permukaan dengan variasi kecepatan vertikal dan lateral yang kompleks tidak dapat dipilih satu metode migrasi terbaik namun ketiganya saling menunjang dari segi struktur maupun penanganan noise.Kata Kunci : metode Phase Shift, metode Finite Difference, metode KirchhoffAbstractSeismic Unix based - pre-stack time migration (PSTM) on 2D seismic data of Bryant Canyon trough the Louisiana gulf of coast has been conducted. This research uses Marmousi data set to determine the most appropriate method of migration. From the test, Phase Shift, Finite-Difference and the Kirchhoff methods were chosen to be applied on line 9 and 12 of Bryant Canyon data set where complex structures such assyncline, fault and salt body and several types of noise e.g bowties, diffractions and multiples were identified. Phase Shift method is reliable for definiting structures that have slopes above 90Ëš where as Finite-Difference method is good in handling lateral velocity variation in the subsurface structure. Kirchhoff method eliminates diffraction patterns so that the existing structure is clearly visible in the seismic cross-section. From this research, it was found that for complex structures can not be selected one of excellentmigration methods but the three methods complimentary each other in terms of structure and handling noise.Keywords : Phase Shift method, Finite-Difference method, Kirchhoff method
ATENUASI MULTIPLE PADA DATA SEISMIK 2D CEKUNGAN BRYANT CANYON LEPAS PANTAI TELUK LOUISIANA TEXAS Saputra, Ade; Namigo, Elistia Liza
Jurnal Fisika Unand Vol 4 No 4: Oktober 2015
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.4.4.%p.2015

Abstract

ABSTRAKTelah dilakukan atenuasi multiple berbasis Seismic Unix pada data seismik 2D laut dalam (3000- 5000 meter) pada cekungan Bryant Canyon lepas pantai teluk Louisiana Texas. Atenuasi dilakukan pada empat line seismik dengan metode Predictive Deconvolution, Transformasi Radon, dan kombinasi Predictive Deconvolution dengan Transformasi Radon atau disebut TauP Deconvolution. Penelitian ini ditujukan untuk mengetahui efektifitas ketiga metode dalam mengatenuasi multiple pada data seismik laut dalam dengan struktur geologi kompleks. Pada keempat line seismik tersebut teridentifikasi water-bottom, peg-leg, dan intrabed multiple. Metode Predictive dan TauP Deconvolution efektif digunakan untuk menghilangkan peg-leg, intrabed multiple, dan multiple di sekitar kubah garam (pada line 3) namun tidak dapat mengatenuasi water-bottom multiple. Kedua metode juga berhasil meningkatkan signal to noise ratio serta memperbaiki dead trace. Metode Transformasi Radon terbukti tidak efektif untuk mengatenuasi multiple laut dalam dengan morfologi yang kompleks.Kata Kunci :   Multiple, Predictive Deconvolution, Transformasi Radon, TauP Deconvolution.AbstractSeismic Unix based - multiple attenuation has been performed on 2D seismic data on deep ocean (3000-5000 metres) of Bryant Canyon basins offshore Louisiana Gulf Texas. Attenuation was performed on four seismic lines by Predictive Deconvolution, Radon Transform, and the combination of Predictive Deconvolution and Radon Transform or called the TauP Deconvolution methods. This study aimed to find out the effectiveness of the three methods in multiple attenuation on marine seismic data in structure geological complex. Water-bottom, peg-leg, and intrabed multiples were identified in the four seismic lines. Predictive Deconvolution method and TauP Deconvolution methods are effective for removing peg-leg, intrabed and salt-related multiples (identified on seismic line 3) but the two methods fail to attenuate water-bottom multiples. The two methods have also successfully enhanced signal to noise ratio and fixed the dead traces. Radon transform method was prooped to be in effective for deep water and complex structure multiple elimination. Keywords :  Multiple, Predictive Deconvolution, Radon Transform, TauP Deconvolution.
Co-Authors Ade saputra Ade Saputra Adrial, Rico Afdal Afdal Afdal Afdal Afdal Rahman Afdhal Muttaqin Ahmad Fauzi Pohan Aisyah, Ovina Alimin Mahyudin Arif Budiman Astuti Astuti - Aulia Latifah Azlin, Amalia Dahyunir Dahlan Damayanti, Elok Dedi Mardiansyah Dian Fitriyani Dian Mega Y Dian Milvita Dwi Pujiastuti Dwi Puryanti Fani Anjelina Fauzana, Husnatul Feriska Handayani Irka, Feriska Handayani Geby Sri Ayu Oktavia Harmadi Harmadi Harmadi Harmadi Hasan, Melanz Hilalliyah, Nisful Husnatul Fauzana Imam Taufiq Imam Taufiq Jarnal Witarsa Jenny Teresia Simamora Jenny Teresia Simamora, Jenny Teresia Komala, Tri Ananda Latifah, Aulia M. Ali Shafii M. Hamidi M. Hamidi M. Hamidi, M. Hamidi Ma’muri Ma’muri Ma’muri, Ma’muri Marwan, Muhammad Marzuki Marzuki Mega Y, Dian Melanz Hasan Meqorry Yusfi Mifthahul Putri Mohammad Ali Shafii Muhammad Marwan Muhammad Subhan Muhammad Subhan Muldarisnur, Mulda Murdiman, Imelda Murdiman, Imelda Mutya Vonnisa Nele Schildermans Nele Schildermans, Nele Nini Firmawati Nurul Annisa Osi Yusdesra Ovina Aisyah Pertiwi, Rahmi Nanda Puspasari, Trevi Jayanti Putri, Mifthahul Rahayu Fitri Rahayu Fitri, Rahayu Rahman, Afdal Rahmi Nanda Pertiwi Ramacos Fardela Remiandayu, Selly Rudi Hidayat Rudi Hidayat Selly Remiandayu Solly Aryza Sri Handani Sri Nofriyanti Sri Nofriyanti, Sri Sri Oktamuliani Trengginas Eka Putra Sutantyo Trevi Jayanti Puspasari Tri Ananda Komala Usna, Sri Rahayu Alfitri Vivi Lispa Yenti Vivi Lispa Yenti, Vivi Lispa Wildian Wildian Witarsa, Jarnal Yusdesra, Osi Zalwi, Eka Nadila Zulfi Zulfi Zulfi Zulfi Zulfi