JGE Pub Date : 2021-07-25 DOI: 10.23960/JGE.V7I2.140

Rinaldi Ikhram, I. Arifin, R. I. Sophian

{"title":"GEOLOGI GUNUNGAPI PURBA SOREANG DAN IMPLIKASINYA TERHADAP POTENSI CEBAKAN EMAS","authors":"Rinaldi Ikhram, I. Arifin, R. I. Sophian","doi":"10.23960/JGE.V7I2.140","DOIUrl":"https://doi.org/10.23960/JGE.V7I2.140","url":null,"abstract":"Gunungapi Purba Soreang yang terletak di Kabupaten Bandung merupakan gunungapi yang tidak aktif dan tererosi kuat. Daerah ini memperlihatkan susunan litologi gunungapi strato-vulanik serta memiliki morfologi perbukitan bergelombang tak beraturan dan bukit-bukit soliter. Penelitian ini dilaksanakan untuk mengetahui hubungan geomorfologi dan geologi Gunungapi Purba Soreang dengan potensi keberadaan cebakan emas. Metode yang dilakukan adalah analisis geomorfologi, pemetaan vulkanostratigrafi dan analisis struktur geologi serta identifikasi zona alterasi dan mineralisasi. Berdasarkan peta morfografi dan kemiringan lereng, daerah penelitian menunjukan bentuk bentang alam khas gunungapi berupa bentuk yang menyerupai lingkaran atau circular feature yang dihasilkan oleh batuan intrusi, kubah lava, dan leher gunungapi purba, sebagai petunjuk lokasi sumber erupsi. Produk gunungapi purba Soreang memperlihatkan fasies sentral hingga distal dalam beberapa satuan gumuk dan khuluk. Litologi penyusun daerah ini di antaranya intrusi andesit dan diorit yang sebagian besar telah mengalami alterasi hidrotermal, perselingan lava dan breksi piroklastika dan tuff. Litologi ini menunjukkan bahwa Gunungapi Soreang merupakan jenis strato-vulanik. Di area Gunungapi Purba Soreang ini telah dilakukam eksplorasi potensi mineralisasi emas pada zona sentral. Pertambangan tradisional juga telah dilakukan oleh masyarakat lokal. Berdasarkan analisis terpadu bentang alam dengan litologi, perkiraan tubuh Gunungapi Purba Soreang dan zona sentral gunungapi tersebut dapat diidentifikasi. Hasil identifikasi tersebut digunakan untuk membantu penetapan area eksplorasi potensi cebakan emas di wilayah Soreang.","PeriodicalId":34835,"journal":{"name":"JGE","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49480898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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JGE Pub Date : 2021-07-25 DOI: 10.23960/JGE.V7I2.150

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PENDUGAAN AWAL DEPOSIT EMAS WILAYAH POBOYA, PALU DENGAN METODE INVERSI HVSR EMAS WILAYAH POBOYA的沉积授权处理，继续使用HVSR的倒置方法

JGE Pub Date : 2021-03-19 DOI: 10.23960/JGE.V7I1.122

Yoga Dharma Persada, I. Ilham, Haura Dhiya Amaninida, Puji Ariyanto, Sandy Tri Gustono

{"title":"PENDUGAAN AWAL DEPOSIT EMAS WILAYAH POBOYA, PALU DENGAN METODE INVERSI HVSR","authors":"Yoga Dharma Persada, I. Ilham, Haura Dhiya Amaninida, Puji Ariyanto, Sandy Tri Gustono","doi":"10.23960/JGE.V7I1.122","DOIUrl":"https://doi.org/10.23960/JGE.V7I1.122","url":null,"abstract":"Emas merupakan salah satu komoditas mineral yang mempunyai harga jual yang cukup tinggi. Indonesia memiliki banyak wilayah yang menyimpan deposit emas di bawah permukaan. Satu di antaranya adalah wilayah Poboya, Kecamatan Mantikulore, Palu. Metode pemetaan deposit emas yang dapat digunakan adalah seismik pasif contohnya mikrotremor. Salah satu teknik pengolahan dari metode seismik pasif adalah Horizontal to Vertical Spectral Ratio (HVSR). HVSR mencerminkan kondisi struktur lapisan di atas batuan dasar. Hasil pemodelan menunjukkan bahwa potensi deposit emas terdapat di wilayah Timur hingga Selatan Poboya. Potensi terbesar terletak di Selatan bagian tersebut. Potensi deposit emas dapat ditemukan pada kedalaman sekitar 300 hingga 1500 meter di bawah permukaan. Analisis potensi tersebut didasarkan ditemukannya anomali lapisan dengan nilai kecepatan gelombang geser (Vs) yang tinggi, berkisar pada rentang nilai 3500-4000 m/s yang bersesuaian dengan batuan beku yang diduga endapan epitermal emas. Hasil pemodelan divalidasi dengan penelitian terdahulu yang memiliki kemiripan. Berdasarkan hasil tersebut menunjukkan bahwa metode inversi HVSR berdasarkan rekaman mikrotremor dapat dijadikan metode awal pendugaan deposit emas yang lebih efektif dan efisien.","PeriodicalId":34835,"journal":{"name":"JGE","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41765089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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JGE Pub Date : 2020-11-24 DOI: 10.23960/jge.v6i3.119

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Foreword March 2020 2020年3月

JGE Pub Date : 2020-03-18 DOI: 10.23960/jge.v6i1.65

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JGE Pub Date : 2020-03-18 DOI: 10.23960/jge.v6i1.64

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PENDUGAAN PATAHAN DAERAH “Y” BERDASARKAN ANOMALI GAYABERAT DENGAN ANALISIS DERIVATIVE Y部门通过导数分析测试先进性分析的要求

JGE Pub Date : 2020-01-17 DOI: 10.23960/JGE.V5I1.1137

Yasrifa Fitri Aufia, Karyanto Karyanto, R. Rustadi

{"title":"PENDUGAAN PATAHAN DAERAH “Y” BERDASARKAN ANOMALI GAYABERAT DENGAN ANALISIS DERIVATIVE","authors":"Yasrifa Fitri Aufia, Karyanto Karyanto, R. Rustadi","doi":"10.23960/JGE.V5I1.1137","DOIUrl":"https://doi.org/10.23960/JGE.V5I1.1137","url":null,"abstract":"The research area \"Y\" is an area of gold mineralization with low sulfidation epithermal type deposit. The existence of this type of mineralization on the path marked by the presence of mineral deposits, which form the quartz veined below the surface of the deposited within the structure of the fault. In this study, analysis of gravity data using derivatives analysis, i.e. First Horizontal Derivative (FHD) to determine the boundary fault structure and Second Vertical Derivative (SVD) to determine the type of fault. The existence of the fault structure integrated with subsurface modeling results in two-dimensional and three-dimensional. The results showed three line slice made in the area of research, identified structure of down faults (normal) trending northeast - south on slice 1 with an estimated dip (slope) is 22° and expected of strike on this fault is N 158° W and thrust fault structure trending northwest - south on slice 2 also slice 3 with an estimated dip (slope) is 22° and expected of strike on this fault is N 158° E. The results of the modeling of two-dimensional and three-dimensional show fracture structure is at the density of 2 g/cc – 2,67 g/cc in the depth of around 100 m - 250 m that consists of sedimentary rocks (clay and sandstone) with a density of 2,2 g/cc – 2,3 g/cc at the age of Tertiary Pliocene, tuff rock with a density of 2,4 g/cc – 2,5 g/cc at the age of Early Miocene and bedrock (basement) in andesite form with a density of 2,67 g/cc.","PeriodicalId":34835,"journal":{"name":"JGE","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48837722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Studi Identifikasi Struktur Geologi Bawah Permukaan Untuk Mengetahui Sistem Sesar Berdasarkan Analisis First Horizontal Derivative (FHD), Second Vertical Derivative (SVD), Dan 2,5D Forward Modeling Di Daerah Manokwari Papua Barat 了解巴布亚西部Manochwari地区一阶水平导数分析（FHD）、二阶垂直导数（SVD）和2.5D正演模型的下表面地质结构识别研究

JGE Pub Date : 2020-01-17 DOI: 10.23960/JGE.V4I2.1065

Shiska Yulistina

{"title":"Studi Identifikasi Struktur Geologi Bawah Permukaan Untuk Mengetahui Sistem Sesar Berdasarkan Analisis First Horizontal Derivative (FHD), Second Vertical Derivative (SVD), Dan 2,5D Forward Modeling Di Daerah Manokwari Papua Barat","authors":"Shiska Yulistina","doi":"10.23960/JGE.V4I2.1065","DOIUrl":"https://doi.org/10.23960/JGE.V4I2.1065","url":null,"abstract":"In general, Manokwari has a geological structure that is in the form of a folding area found in the highlands of the mountains. Among the creases, there is a fault up and the fault down. In coastal or marine areas found many reefs and corals. The study of gravity was conducted in the Manokwari area of West Papua with the aim to know the subsurface geological structures based on FHD (First Horizontal Derivative), SVD (Second Vertical Derivative) and 2.5D Forward Modeling on the residual anomaly maps of the study area. The results showed that the research area has Bouguer Anomaly value ranged from 4 mGal to 96 mGal with the low anomaly at the left side of the research area lengthwise relatively in north-west to south-east direction, the middle-value anomaly spreads in the west-east area of research area, high anomaly scattered in the northern part of the research area. The results of the 2.5D subsurface modeling and the SVD and FHD analysis indicated the presence of a Thrust Fault on the C-C’ cross-section, on the B-B’ cross-section there is a Diorite Lembai intrusion with the density value is 2.75 gr/cc, whereas the A-A' cross-section which intersects with Sorong fault were not found any fault or rock intrusion based on observed gravity data of the research area.","PeriodicalId":34835,"journal":{"name":"JGE","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48750992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

INVERSI 2D DATA MAGNETOTELURIK UNTUK MENGETAHUI KEBERADAAN HIDROKARBON DAERAH BULA, MALUKU 磁资料的二维反演以满足布拉、PRELUME的碳氢化合物安全性

JGE Pub Date : 2020-01-17 DOI: 10.23960/JGE.V4I3.1071

Elen Novia Limswipin, Syamsurijal Rasimeng, Karyanto Karyanto, Noor Muhammad Indragiri

{"title":"INVERSI 2D DATA MAGNETOTELURIK UNTUK MENGETAHUI KEBERADAAN HIDROKARBON DAERAH BULA, MALUKU","authors":"Elen Novia Limswipin, Syamsurijal Rasimeng, Karyanto Karyanto, Noor Muhammad Indragiri","doi":"10.23960/JGE.V4I3.1071","DOIUrl":"https://doi.org/10.23960/JGE.V4I3.1071","url":null,"abstract":"There had been done a regional research which tittle is “2D inversion magnetotelluric data for understanding the hidrocarbon presence in Bula, Maluku”. This study aims to determine the resistivity distribution area of research based on data Magnetotelluric, identifying the presence of hydrocarbons based on the value of the resistivity of the results of 2D inversion of data Magnetotelluric. Methods of data processing done are (i) transform raw data from the time domain into the frequency domain, (ii) reduce noise by robust processing, (iii) process combine, (iv) Selection cross power, (v) inversion 1D and 2D. 2D inversion results is sectional subsurface resistivity distribution, layer having resistivity values 7-16 Ωm along MT1 and MT7 point at a depth of 1000 meters is a clay stone which is indicated as cap rock. Layer with resistivity values 34-120 Ωm, which is between the point MT6 and MT7 at a depth of 1500 meters is indicated as the sandstone reservoir. Based on geologic information and sectional 2D inversion seen their fault based on the resistivity contrast is between the point MT2 and MT3, MT3 and MT4 and MT6 and MT7.","PeriodicalId":34835,"journal":{"name":"JGE","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42929171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

ANALISIS PETROFISIKA UNTUK MENENTUKAN OIL-WATER CONTACT PADA FORMASI TALANGAKAR, LAPANGAN “FBT”, CEKUNGAN SUMATRA SELATAN

JGE Pub Date : 2020-01-17 DOI: 10.23960/JGE.V5I1.1133

F. Tarigan, Ordas Dewanto, Karyanto Karyanto, R. C. Wibowo, Andika Widyasari

{"title":"ANALISIS PETROFISIKA UNTUK MENENTUKAN OIL-WATER CONTACT PADA FORMASI TALANGAKAR, LAPANGAN “FBT”, CEKUNGAN SUMATRA SELATAN","authors":"F. Tarigan, Ordas Dewanto, Karyanto Karyanto, R. C. Wibowo, Andika Widyasari","doi":"10.23960/JGE.V5I1.1133","DOIUrl":"https://doi.org/10.23960/JGE.V5I1.1133","url":null,"abstract":"In conducting petrophysics analysis, there are many methods on each property. Therefore, it is necessary to determine the exact method on each petrophysical property suitable for application in the field of research in order to avoid irregularities at the time of interpretation. The petrophysical property consists of volume shale, porosity, water saturation, etc. This research used six well data named FBT01, FBT02, FBT03, FBT04, FBT05, and FBT06 and also assisted with core data contained in FBT03. Core data used as a reference in petrophysical analysis because it was considered to have represented or closed to the actual reservoir conditions in the field. The area in this research was in Talangakar Formation, \"FBT\" Field, South Sumatra Basin. The most suited volume shale method for “FBT” field condition was gamma ray-neutron-density method by seeing its photo core and lithology. As for the effective porosity, the most suited method for the field was neutron-density-sonic method by its core. Oil-water contact was useful to determine the hydrocarbon reserves. Oil-water contact was obtained at a depth of 2277.5 feet on FBT01, 2226.5 feet on FBT02, 2312.5 feet on FBT03, 2331 feet on FBT04, 2296 feet on FBT05, and 2283.5 feet on FBT06. The oil-water contact depth differences at Talangakar formation in FBT field caused by structure in subsurface.","PeriodicalId":34835,"journal":{"name":"JGE","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43295935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

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