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Djayus, Djayus
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STUDI MEKANISME SUMBER GEMPABUMI DI WILAYAH KALIMANTAN BERDASARKAN GERAK AWAL GELOMBANG P Rusmilawati, Depi; Djayus, Djayus; Lepong, Piter
GEOSAINS KUTAI BASIN Vol 2 No 2 (2019)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v2i2.470

Abstract

Pulau Kalimantan selama ini dikenal sebagai pulau yang relatif aman dari gempa bumi. Tujuan penelitian ini adalah Mengetahui mekanisme sumber gempabumi dengan menggunakan data gerak awal dari gelombang P dan mencari penyebab dari kejadian gempabumi di wilayah Kalimantan tahun 2015-2018. Dilakukan pengolahan data menggunakan program fokal mekanisme dengan memilih data gempa bumi yang mempunyai magnitude ≥ 4 Skala Ricther (SR). Penelitian ini menggunakan metode gerak awal gelombang P dengan penentuan polaritas gelombang yang berupa gelombang naik (kompresi) dan gelombang turun (dilatasi). Dari hasil analisis fokal mekanisme gempabumi Kalimantan 2015-2018 diperoleh nilai parameter orientasi bidang sesar berupa strike, dip dan rake. Untuk strike di Kalimantan bagian Utara 114- 170, Dip 80-90 dan Rake -2 – (-136). Sedangkan di Kalimantan Timur, Strike 158- 174, Dip 85-89 dan Rake 2-179. Kalimantan Selatan dengan Strike 127- 159, Dip 40-47 dan Rake 88-97. Hasil penelitian ini menunjukan bahwa penyebab gempa Kalimantan bagian Utara secara umum berupa sesar oblique dan Sesar geser (strike slip). Sedangkan Kalimantan bagian Timur merupakan sesar geser (strike slip) serta Kalimantan bagian Selatan berupa sesar naik (reverse fault) dan Sesar oblique (oblique reverse fault).
IDENTIFIKASI SEBARAN DAN KETEBALAN LAPISAN BATUBARA BERDASARKAN DATA WELL LOGGING DI PT BORNEO EMAS HITAM LOA TEBU KALIMANTAN TIMUR Ernia, Yuyun; Djayus, Djayus; Supriyanto, Supriyanto
GEOSAINS KUTAI BASIN Vol 3 No 2 (2020)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v3i2.680

Abstract

The increase of coal demand must followed by the exploration, including distributin and thickness of coal seam. The data that has beeen used in this research was recondary data in the form of Well Logging data (Gammar Ray Log and Density Log) and coring data. Gamma Ray Log and Density Log was interpreted to obtain rock lithology, then processed by using software to obtain. Seread and thickness of coal seam, correlation between boreholes. The result are identification of seread direction, depth and thickness of coal seams bared on. Coal’s distribution analysis at research area, identified area of coal seams distribution. Relative to the southwest and north east. With four coal seams. Three seams having split or branching. Seam A with average thickness value 0,43 m, seam B with average thickness value 0,26 m and seam D with average thickness value 0,24 m. the widest seam distribution was seam A and B while the fewest seam was seam D.
ANALISIS HUBUNGAN NILAI HGI (HARDGROVE GRINDABILITY INDEX) ASH CONTENT INHERENT MOISTURE DAN TOTAL SULFUR TERHADAP NILAI KALORI BATUBARA DI PT. GEOSERVICES SAMARINDA KALIMANTAN TIMUR Yuliana, Yuliana; Djayus, Djayus; Munir, Rahmiati; supriyanto, Supriyanto
GEOSAINS KUTAI BASIN Vol 5 No 1 (2022)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v5i1.789

Abstract

Abstrak Kualitas batubara ditentukan oleh kandungan HGI, Ash Content, Inherent Moisture, Total Sulfur dan Kalori. Tujuan penelitian ini dilakukan untuk mengetahui hasil uji HGI, Ash Content, Inherent Moisture, Total Sulfur, kalori serta hubungannya dengan kalori batubara. Penelitian ini menggunakan data sekunder. Data selanjutnya dikelompokkan berdasarkan kelas kalori, kemudian dianalisis dengan regresi dan korelasi. Hasil penelitian ini adalah nilai rata-rata HGI kelas kalori sedang dan tinggi (5727, 6261) Cal/gr, Ash Content terhadap keempat kelas kalori (4609, 5600, 6361, 7394) Cal/gr, Inherent Moisture (4606, 5602, 6386, 7394) Cal/gr, Total Sulfur (4616, 5598, 6384, 7394) Cal/gr dan hubungan HGI terhadap kalori kelas sedang adalah positif dan kelas tinggi negatif, hubungan Ash Content terhadap setiap kelas adalah negatif, hubungan Inherent Moisture terhadap setiap kelas kalori adalah negatif dan hubungan Total Sulfur terhadap kalori kelas rendah dan tinggi adalah positif sedangkan kelas kalori sedang dan sangat tinggi adalah negatif. Kesimpulan dari penelitian ini adalah nilai rata-rata HGI (5727,6261) Cal/gr, Ash Content (4609, 5600, 6361, 7394) Cal/gr, Inherent Moisture (4606, 5602, 6386, 7394) Cal/gr serta Total Sulfur (4616, 5598, 6384, 7394) Cal/gr dan Hubungan HGI, Ash Content, Inherent Moisture dan Total Sulfur terhadap kalori rata-rata negatif kecuali HGI kelas sedang dan total sulfur kelas rendah dan tinggi dan berdasarkan hasil analisis interpretasi dari keempat parameter bahwa HGI tidak dapat menentukan kualitas batubara.
IDENTIFIKASI KEBERADAAN JALUR GOA BAWAH TANAH (BUNKER) BERDASARKAN ANALISIS DATA MAGNETIK DI DESA JEMBAYAN ., Suryadi; Supriyanto, Supriyanto; Djayus, Djayus
GEOSAINS KUTAI BASIN Vol 4 No 1 (2021)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v4i1.721

Abstract

Existence of underground cave (bunker) in Jembayan has been known for long, but underground pathway was sealed and lost due to landslide. Goal of this research is to identify existence of underground cave (bunker) pathway based on magnetic data analysis. Topographic data acquisition with Theodolit and magnetic data acquisition with Geotron Model G5 Proton Memory Magnetometer at May 2nd 2019 with 98 observation point and space between observation point of 5 meters. Data processing carried out with diurnal variation corection, IGRF correction,. Upward continuation and reduce to pole. Modeling cared out by analyzing magnetic field anomaly that has been reduced to pole and upward continuation with 10 m height. Based on the analysis results and pathway cave magnetic data interpretation in Jembayan area shows existence of continuity from observation bunker and main bunker to north direction confirmed by higher magnetic field value between 230.1 to 2541 nT.
ANALISIS NILAI LOG GAMMA RAY DAN LOG DENSITY TERHADAPVARIASI KECEPATAN PEREKAMAN METODE WELL LOGGING “ROBERTSON GEOLOGGING (RG)” Khasanah, Ulfiatul; Supriyanto, Supriyanto; Djayus, Djayus
GEOSAINS KUTAI BASIN Vol 2 No 1 (2019)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v2i1.400

Abstract

The lithology of rocks in the subsurface can be known from the results of analysis of coring and geophysical logging. The activity of recording data geophysical logging in the work area of PT. Mintec Abadi generally uses a velocity of 3 m/minute - 4 m/minute with drill depths and different location points. The purpose of this study was to determenite the lithology pattern of rocks based on curves gamma ray log and density with record velocity variation of geophysical logging, and what is the optimal velocity. Records of data geophysical logging (Log Gamma Ray and Density Log) on well log tests with velocity variation, in the same lithology range of rocks, analyzed by the structure and pattern of the lithology, and compared to other velocity. The results of this study shows the lithological pattern of the record velocity variation (1.5 m/minute – 10 m/minute) give relatively the same results with the lithology arrangement is top soil, mudstone, coal and muddy sandstone. The optimal velocity of geophysical logging based on conditions in the work area of PT. Mintec Abadi between 5 m/minute – 7 m/minute.
ANALISIS TEKANAN PORI BAWAH PAnalysis of subsurface pore pressure is used to determine the potential problems that can occur in formation. The research purpose to determine sERMUKAAN MENGGUNAKAN METODE EATON PADA SUMUR ELNUSA BERDASARKAN DATA WELL LOGGING Datu, Bonaria; Djayus, Djayus; Natalisanto, Adrianus Inu
GEOSAINS KUTAI BASIN Vol 3 No 2 (2020)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v3i2.695

Abstract

Analysis of subsurface pore pressure is used to determine the potential problems that can occur in formation. The research purpose to determine subsurface pressure using the Eaton method and identify potential drilling problems, so prevention can be done to reduce accidents. Research on BD 325 wells is secondary data in the form of resistivity and density log data. Analysis of subsurface pressure is carried out using the Eaton method which results in normal pore pressure and pressure values. Based on the results of graph analysis, the pore pressure value shows the depth interval 3943.9 ft – 3949.1 ft pressure average 5.4 ppg, depth 4407.8 ft - 4417.6 ft pressure average 0.6 ppg, depth 4546.9 ft - 4554.8 ft pressure average 1.4 ppg, depth 4748.3 ft – 4753 ft pressure average 4.8 ppg and depth 5026.5 ft - 5033.7 ft pressure average 4.7 ppg where 5 zones experience subnormal pressure, so it can be concluded that the potential problems can occur lost circulation because the hydrostatic pressure of the mud is greater than the formation pressure which results in loss of drilling mud entering the formation.
Perbandingan Nilai Resistivitas Menggunakan Metode Logging Resistivitas Listrik dan Electrical Resistivity Tomography (ERT) Antony, Nurvani; Lepong, Piter; Wahidah, Wahidah; Supriyanto, Supriyanto; Djayus, Djayus
GEOSAINS KUTAI BASIN Vol. 6 No. 2 (2023)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v6i2.1094

Abstract

Metode geolistrik sering digunakan untuk menginterpretasikan lapisan bawah permukaan yang dangkal. Namun dalam kenyataannya, metode ini memberikan pengukuran resistivitas bawah permukaan yang berbeda dengan metode log resistivitas. Selain itu, metode ini memiliki kelemahan dalam membaca lapisan tipis saat kedalaman pengukuran bertambah. Oleh karena itu, dilakukan penelitian ini untuk membandingkan metode geolistrik dan log resistivitas, serta menentukan faktor-faktor yang menyebabkan perbedaan pengukuran tersebut. Penelitian ini menggunakan data sekunder yang nantinya diolah menggunakan software tertentu. Data geolistrik diolah menggunakan Res2DINV untuk memperoleh penampang resistivitas 2D. Kemudian data log resistivitas diolah menggunakan WellCAD untuk memperoleh kurva resistivitas. Kedua hasil tersebut digabungkan dalam satu gambar untuk dibandingkan dan dianalisis perbedaannya. Hasil yang diperoleh menunjukan bahwa nilai resistivitas semu yang ditampilkan penampang geolistrik lebih kecil dibandingkan kurva resistivitas milik log resistivitas. Selain itu, terdapat sedikit perbedaan interpretasi antara keduanya, dimana metode geolistrik tidak dapat membaca lapisan tipis yang cukup dalam, seperti batubara, dan metode log resistivitas tidak dapat membaca lapisan clay.
Penentuan Nilai Parameter Gempabumi Menggunakan Metode Geiger dan Hukum Laska pada Pulau Lombok Sari, Bella Dessy Wulan; Djayus, Djayus; Supriyanto, Supriyanto; Hendrawanto, Benny
GEOSAINS KUTAI BASIN Vol 5 No 1 (2022)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v5i1.706

Abstract

Earthquake is an event of the Earth vibration caused by the shifting of rock layers on Earth immediately that caused by the shifting of tectonic plates. The aim of this study is to know the Earthquake's Parameter. The Earthquake that happened in Lombok, August 5th 2018, at 18:46:37 (Western Indonesian Time), with magnitude 7,0 SR. By using six Earthquake recording stations, there are KLNI (in Mataram), TWSI (in Sumbawa), SRBI (in Buleleng), DNP (in Denpasar), PLAI (in Plampang) and BYJI (in Banyuwangi). The Coordinate of each Earthquake observer station, P Wave and S Wave are included. The Epicenter value is analyzed using the Laska Law and the Hypocenter value is analyzed using the Geiger Method. The results showed the Earthquake Parameter with coordinates; Latitude: - 8.28 South; Longitude: 116,47 East, the Epicenter value of KLNI station is 100 km away, the TWSI station is 150 km away, the SRBI station is 300 km away, the DNP station is 300 km away, the PLAI station is 317 km away, the BYJI station is 483 km away and the hypocenter value is 30 km. Deduced from the depth, this Earthquake included into Shallow Earthquake and included as Main Shock or Main Earthquake.
ANALISA STRUKTUR BAWAH PERMUKAAN DAERAH PROSPEK PANAS BUMI “GF-TNH” SUMATERA BARAT BERDASARKAN METODE GAYA BERAT Ramadhan, Adi Buchori; Djayus, Djayus; Lepong, Piter
GEOSAINS KUTAI BASIN Vol 3 No 1 (2020)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v3i1.594

Abstract

The gravity method is one of the geophysical exploration methods based on the Earth's gravity field anomaly caused by variations in rock mass density laterally and vertically below the measuring point. The study area has a range of complete bouguer anomaly of -48.3 mGall up to -4.0 mGall and depth estimation with spectrum analysis showing a regional anomaly depth value of 2.43 km and a residual anomaly depth of 0.77 km which is interpreted as a boundary zone between bedrock and subsurface rocks that have more varied anomaly values. Then the separation of regional and residual anomaly was carried out using the Butterworth Filter and Second Vertical Derivative methods. From the results of the residual anomaly map shows the range of anomaly values ​​-0.5 mGall to 4.0 mGall. The map of residual anomaly shows a more complex pattern of anomaly because residual anomaly provide a lateral representation of rock mass distribution or the presence of geological structures below the surface that are relatively close to the surface of the earth. Then the residual anomaly map is made 3D inversion modelling with Second Vertical Derivative Technique to find out the fault and its type, then Derivative Analysis is performed. The geological structure in the study area is based on the results of inversion modelling and derivative analysis, dominated by faults and the type of fault is reverse fault and normal fault and the type of rock is dominated by igneous rock which has a high density value.
Pengaruh Inherent Moisture Terhadap Nilai Kandungan Kalori Pada Batubara Kaltim (Studi Kasus Data Im dan Data Kalori Tahun 2019 di PT. Geoservices Samarinda) Yanti, Nurma; Djayus, Djayus; Suprianto, Suprianto; Natalisanto, Adrianus Inu
GEOSAINS KUTAI BASIN Vol 4 No 2 (2021)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v4i2.746

Abstract

Nilai kalori batubara dipengaruhi oleh beberapa faktor seperti kandungan air bawaan (inherent moisture) atau IM, abu (ash), karbon tetap (fixced carbon), total sulfur dan zat terbang (volatile matter). Tujuan penelitian ini untuk mengetahui berapa jumlah sampel batubara yang masuk ke dalam kelas kalori rendah, kelas kalori sedang, kelas kalori tinggi dan kelas kalori sangat tinggi, pengaruh inherent moisture terhadap nilai kalori batubara dan gambaran umum IM dan kalori batubara. Penelitian ini di lakukan di PT.Geoservices Samarinda, penelitian ini menggunakan data sekunder yaitu data kalori dan IM tahun 2019. Dilakukan perhitungan sebaran frekuensi nilai kalori dan IM. Kemudian kedua jenis data tersebut di plot untuk melihat pengaruh IM terhadap kalori. Hasil penelitian menunjukkan jumlah sampel kelas kalori rendah sebanyak 496 (11.4%) didominasi oleh IM kategori sedang, kelas kalori sedang 3146 (72.3%) didominasi IM kategori sedang, kelas kalori tinggi 649 (14.92%) didominasi IM kategori rendah, dan kelas kalori sangat tinggi 60 (1.38%) didominasi IM kategori rendah. Nilai korelasi IM terhadap kalori pada kelas kalori rendah -0.46, kelas kalori sedang -0.60, kelas kalori tinggi -0.90 dan kelas kalori sangat tinggi -0.79 hal ini menunjukkan bahwa semakin tinggi nilai IM nilai kalori akan semakin rendah. Sebanyak 72.3% batubara masuk dalam kelas kalori sedang dengan nilai IM antara 14.22-16.13 %adb (air dried base).
Co-Authors -, lisa haryani Abbas, Asri Yana Pratama Adrianus Inu Natalisanto Agfanny, Ferruzi Ansyah, Habri Antony, Nurvani Arrosyidah, Mosy R azisyarlina, Dwi Batrisyia, Nisa Bulo, Deni Datu, Bonaria Devi, Honey Puspa Ernia, Yuyun Firdaus, Muhamad Akmal Haryono, Arif Hasmah, Siti Hendrawanto, Benny Hutabarat, Melisa Julianti, Sri Rezeki Kadek Subagiada, Kadek Khasanah, Ulfiatul Kusmardiyanti, Retni Lepong, Piter Linda, Fitria Nova MARIA BINTANG Maulana, Risky Mislan Munir, Rahmiati Nanda Khoirunisa, Nanda pangge, claudius eswinsky Rahmiati Rahmiati Ramadhan, Adi Buchori Ramadhani, Fika Desy Rusmilawati, Depi Sadewo, Wisnu Saputra, Ary Rhamadan Sari, Bella Dessy Wulan Situmeang, Edberg Sri Wahyuni Sunarti Supriyanto Supriyanto Suryadi . Wahidah Wahidah Wibowo, Nobella Hadi Yanti, Derli Yanti, Nurma Yuliana Yuliana Yusuf, Mustaid