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Seismic and Sequence Analysis of Middle to Late Miocene Deposits of Northeast Java Basin Yuniardi, Yuyun
Indonesian Journal on Geoscience Vol 2, No 2 (2015)
Publisher : Geological Agency

DOI:10.17014/ijog.2.2.101-110This study is focused on Middle to Late Miocene sediments. As depicted in the regional geology of Indonesia, the area of study is part of Northeast Java Basin. There are three phases of tectonism in the basin: extensional tectonics at Eocene-Oligocene time, compressional tectonics at Middle Miocene, and compressional tectonics at Miocene-Pliocene time. The result of the study shows three sequences were developing during Middle to Late Miocene, those are: (1) Middle Miocene sequence-1 (MM-1 sequence) consisting of a Lowstand Tract System deposition in Middle Miocene-1 (LST MM-1), Transgressive System Tract deposition in Middle Miocene-1 (TST MM-1), and Highstand System Tract deposition in Middle Miocene-1 (HST MT-2); (2) Middle Miocene sequence-2 (MT-2 sequence), comprising Transgressive System Tract Middle Miocene-1 (TST MM-2), and Highstand System Tract deposition in Middle Miocene-1 (HST MM-2); (3) Late Miocene sequence-1 (LM-1 sequence), composed of a Lowstand Tract System deposition in Late Miocene -1 (LST LM-1) and a Transgressive System Tract deposition in Late Miocene-1 (TST LM-1).

Potensi Gas Biogenik di Cekungan Kutai Bagian Selatan, Kalimantan Timur Yuniardi, Yuyun; Mardiana, Undang; Abdullah, Fikri
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 4 (2015): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Delineation of the subsurface of data required to determined potential the presence of biogenic gas. Subsurface interpretation is done by using the data for analysis electrolysis cutting, the log data in the form of Logs GR, RT, NEU, RHOB of 39 wells and gas data (Mud Logs) from the chromatograph and Correlation wells are done. Shallow gas is concentrated or accumulated in the marker interval until Fs-s2 and Fs-s3 (at the depth interval of 950-1300 MSS), and isolated existence.The existence of gas on the platform M in shallow zones (shallow zone, above the marker MF2) is dominated by C1 gas/methane (gas surface), there were no gas C2 (only minor traces on the M38 start at a depth of wells 1200 MSS), while the presence of other gas (C3, C4, C5) only appear as minor traces. Based on gas analysis, it can be concluded that in the interval of 950-1300 MSS there is a surge of the total gas, when compared with data from its Master Log turns anomaly is derived from limestone and coal layers in which these results are correlated with a map of Gas Bearing Reservoir Mapping.Based on the data that has been processed, it can be concluded that the shallow gas accumulates at a depth of 950-1300 MSS or at interval marker Fs-s2 and Fs-s3. So for the next drilling activity on Platform M, is expected to be aware of the depth zone.Keyword - Biogenic Gas, Electrofacies Analysis, Delineation, Gas Analysis, , Marker Interval, Well Correlation

Seismic and Sequence Analysis of Middle to Late Miocene Deposits of Northeast Java Basin Yuniardi, Yuyun
Indonesian Journal on Geoscience Vol 2, No 2 (2015)
Publisher : Geological Agency

DOI:10.17014/ijog.2.2.101-110This study is focused on Middle to Late Miocene sediments. As depicted in the regional geology of Indonesia, the area of study is part of Northeast Java Basin. There are three phases of tectonism in the basin: extensional tectonics at Eocene-Oligocene time, compressional tectonics at Middle Miocene, and compressional tectonics at Miocene-Pliocene time. The result of the study shows three sequences were developing during Middle to Late Miocene, those are: (1) Middle Miocene sequence-1 (MM-1 sequence) consisting of a Lowstand Tract System deposition in Middle Miocene-1 (LST MM-1), Transgressive System Tract deposition in Middle Miocene-1 (TST MM-1), and Highstand System Tract deposition in Middle Miocene-1 (HST MT-2); (2) Middle Miocene sequence-2 (MT-2 sequence), comprising Transgressive System Tract Middle Miocene-1 (TST MM-2), and Highstand System Tract deposition in Middle Miocene-1 (HST MM-2); (3) Late Miocene sequence-1 (LM-1 sequence), composed of a Lowstand Tract System deposition in Late Miocene -1 (LST LM-1) and a Transgressive System Tract deposition in Late Miocene-1 (TST LM-1).

Seismic and Sequence Analysis of Middle to Late Miocene Deposits of Northeast Java Basin Yuniardi, Yuyun
Indonesian Journal on Geoscience Vol 2, No 2 (2015)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.2.2.101-110

DOI:10.17014/ijog.2.2.101-110This study is focused on Middle to Late Miocene sediments. As depicted in the regional geology of Indonesia, the area of study is part of Northeast Java Basin. There are three phases of tectonism in the basin: extensional tectonics at Eocene-Oligocene time, compressional tectonics at Middle Miocene, and compressional tectonics at Miocene-Pliocene time. The result of the study shows three sequences were developing during Middle to Late Miocene, those are: (1) Middle Miocene sequence-1 (MM-1 sequence) consisting of a Lowstand Tract System deposition in Middle Miocene-1 (LST MM-1), Transgressive System Tract deposition in Middle Miocene-1 (TST MM-1), and Highstand System Tract deposition in Middle Miocene-1 (HST MT-2); (2) Middle Miocene sequence-2 (MT-2 sequence), comprising Transgressive System Tract Middle Miocene-1 (TST MM-2), and Highstand System Tract deposition in Middle Miocene-1 (HST MM-2); (3) Late Miocene sequence-1 (LM-1 sequence), composed of a Lowstand Tract System deposition in Late Miocene -1 (LST LM-1) and a Transgressive System Tract deposition in Late Miocene-1 (TST LM-1).

Pendugaan Akifer Airtanah dengan Metode Geolistrik Konfigurasi Schlumberger di Lereng Utara Gunungapi Tangkubanparahu Yuyun Yuniardi; Hendarmawan Hendarmawan; Abdurrokhim Abdurrokhim; Vijaya Isnaniawardhani; Febriwan Mohammad; Muhammad Kurniawan Alfadli; Panji Ridwan
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 29, No 2 (2019)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/risetgeotam2019.v29.1051

Airtanah sangat diperlukan dan meningkatnya jumlah penduduk akan menyebabkan pengurangan cadangan airtanah yang tersedia. Gunung Tangkubanparahu merupakan daerah endapan vulkanik yang memiliki potensi sistem akuifer airtanah yang baik. Tujuan penelitian ini adalah untuk mengetahui potensi airtanah dari sistem akuifer vulkanik berdasarkan pengamatan geologi dan pengukuran geolistrik 1D sebanyak 100 titik. Hasil penelitian menunjukkan empat kelompok nilai resistivitas yang merepresentasikan kondisi geologi bawah permukaan. Kelompok pertama mempunyai nilai 0-100 ohm.m, berupa kelompok batuan piroklastik yang tercampur tanah. Kelompok kedua mempunyai nilai resitivitas 101-250 ohm.m, berupa kelompok batuan perselingan antara pasir tufan dan tuf kasar. Kelompok ketiga mempunyai nilai 251-600 ohm.m, berupa kelompok batuan breksi. Kelompok keempat mempunyai nilai resistivitas >600 ohm.m, berupa kelompok batuan aliran lava. Sistem airtanah yang dapat diasumsikan sebagai akifer tersebar merata pada kedalaman 50 m, 75 m, dan 100 m berupa kelompok batuan tuf.Groundwater is the primary source of water and the increase in population will cause an decrease in groundwater reserves. Mt.Tangkubanparahu is a volcanic deposition area that has high potential groundwater aquifer systems. The purpose of this study was to determine the groundwater potential of the volcanic aquifer system based on geology mapping and 1D geoelectric measurements at 100 stations. The results indicated four groups of resistivity values, which represent subsurface geological conditions. The first group has a resistivity value of 0-100 ohms.m in the form of pyroclastic rocks. The second group has a resistivity value of 101-250 ohms.m in the form sand tuff and coarse tuff. The third group has a value of 251-600 ohm.m in the form of breccia rocks. And the fourth group has resistivity values> 600 ohms in the form of lava flow rock groups. In the groundwater system, the layer that can be assumed as aquifer is evenly distributed at depths of 50 m, 75 m, and 100 m in the form of tuff groups.

Seismic and Sequence Analysis of Middle to Late Miocene Deposits of Northeast Java Basin Yuyun Yuniardi
Indonesian Journal on Geoscience Vol 2, No 2 (2015)
Publisher : Geological Agency

DOI:10.17014/ijog.2.2.101-110This study is focused on Middle to Late Miocene sediments. As depicted in the regional geology of Indonesia, the area of study is part of Northeast Java Basin. There are three phases of tectonism in the basin: extensional tectonics at Eocene-Oligocene time, compressional tectonics at Middle Miocene, and compressional tectonics at Miocene-Pliocene time. The result of the study shows three sequences were developing during Middle to Late Miocene, those are: (1) Middle Miocene sequence-1 (MM-1 sequence) consisting of a Lowstand Tract System deposition in Middle Miocene-1 (LST MM-1), Transgressive System Tract deposition in Middle Miocene-1 (TST MM-1), and Highstand System Tract deposition in Middle Miocene-1 (HST MT-2); (2) Middle Miocene sequence-2 (MT-2 sequence), comprising Transgressive System Tract Middle Miocene-1 (TST MM-2), and Highstand System Tract deposition in Middle Miocene-1 (HST MM-2); (3) Late Miocene sequence-1 (LM-1 sequence), composed of a Lowstand Tract System deposition in Late Miocene -1 (LST LM-1) and a Transgressive System Tract deposition in Late Miocene-1 (TST LM-1).

PETA RAWAN LONGSOR DESA NANGGERANG, KECAMATAN SUKASARI, KABUPATEN SUMEDANG, JAWA BARAT MENGGUNAKAN ANALISIS KESTABILAN LERENG TIGA DIMENSI Aruan, Immanuel Hareanto; Yuniardi, Yuyun; Khoirullah, Nur; Sophian, Raden Irvan
Bulletin of Scientific Contribution Vol 22, No 2 (2024): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v22i2.55505

Pada tanggal 3 Februari 2024, terjadi longsor di Desa Nanggerang, Kecamatan Sukasari, Kabupaten Sumedang, Provinsi Jawa Barat. Longsor ini terjadi di lereng persawahan masyarakat setempat. Berangkat dari hal ini, dilakukan penelitian mengenai peta kerawanan longsor lereng lokal di Desa Nanggerang untuk memberikan informasi kepada masyarakat setempat mengenai potensi longsor yang ada. Penelitian dilakukan menggunakan analisis kestabilan lereng tiga dimensi (3D) dengan perangkat Rocscience Slide 3. Geometri lereng diidentifikasi menggunakan proses fotogrametri yang diakuisisi oleh pesawat nirawak. Sedangkan lapisan yang dibagi, yaitu top soil OH, tanah MH, dan batuan andesit terlapukkan, diidentifikasi melalui observasi lapangan dan uji laboratorium mengenai sifat fisik dan mekaniknya. Dengan memasukkan index properties ke dalam model 3D lereng hasil proses fotogrametri, perhitungan kestabilan lereng menggunakan metode Janbu dilakukan untuk mendapatkan peta rawan longsor di daerah penelitian. Hasil komputasi menunjukkan, lereng di Desa Nanggerang berada pada kondisi stabil pada kondisi kering (FK = 1,5). Sedangkan pada kondisi jenuh dan pseudo-statis lereng mengalami keruntuhan (FK <1). Oleh karena itu, disarankan untuk mengefisiensikan penggunaan lahan dan aliran pada persawahan guna mengurangi risiko terjadinya longsor.

SANDSTONE QUALITY ASSESSMENT FROM CORE DATA OF SANTUL FORMATION, TARAKAN BASIN BASED ON PETROGRAPHY AND ROUTINE CORE ANALYSIS Yuniardi, Yuyun; Muljana, Budi; Mardiana, Undang; Hardiyono, Adi; Nur, Andi Agus; Mohammad, Febriwan; Alfadli, Muhammad Kurniawan
Bulletin of Scientific Contribution Vol 21, No 3 (2023): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v21i3.52131

This study analysss the quality of sand stone as reservoir in Sentul Formation, Tarakan Basin, based on petrography and routine core analysis. The quality of the sandstone in facies A (depth of 1743.75–1747.28m) is moderate. This assessment is based on the porosity value of routine core analysis from 19.48% to 27.88%, and permeability value from 25mD to 213 mD. The sandstone quality of facies B (depth of 1741.80 m–1743.75m) is good, this is based on the value of the porosity from routine core ranges from 23.34% to 26.71% and 83-359 mD of permeability value. The quality of sandstone in facies C (depth of 1737.65m–1737.75m) is good. The differences of the quality affected by the various level of compaction, sorting, and contact between the grains. The presence of carbon material and laminated clay also led to differences in the quality of the reservoir through inter-granule space filling. Sandstone mineral composition of each facies dominated by mono crystalline quartz which is chemically relatively stable, so that the cementation and replacement processes do not overly affect the porosity and permeability.

Karakteristik Sistem Akuifer pada Formasi Endapan Permukaan di Daerah Sei Mati Kota Medan Berdasarkan Metode Geolistrik 2D Mutaqin, Deden Zaenudin; Mardiana, Undang; Alfadli, Muhammad Kurniawan; Mohammad, Febriwan; Yuniardi, Yuyun; Nur, Andi Agus
BERKALA SAINSTEK Vol 8 No 4 (2020)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v8i4.18102

Daerah Sei mati memiliki potensi sumber daya air yang baik, dikarenakan daerah yang termasuk Cekungan Air tanah Medan. Penelitian ini bertujuan untuk mengetahui potensi airtanah dengan menggunakan metode geolistrik 2D dengan konfigurasi wenner-schulumberger. Hasil penelitian menunjukan terdapat 2 lapisan akuifer yaitu akuifer dangkal dan dalam. Lapisan akifer dangkal berada pada kedalaman berkisar antara 0 – 50 meter, membentuk pola channel-channel yang menunjukan endapan fluvial dengan nilai tahanan jenis antara 5 Ω.m - 10 Ω.m, dengan litologi pasir lempungan, namun dibeberapa tempat dijumpai channel lempung yang bersifat akuiklud (tidak dapat menyimpan air). Lapisan akuifer dalam muncul pada kedalaman 50 meter hingga 100 meter dengan litologi pasir.

ANALYSIS OF LANDSLIDE CAUSES IN NANGGERANG VILLAGE, SUKASARI SUB DISTRICT, SUMEDANG REGENCY THROUGH IDENTIFICATION LANDSLIDE SLOPE MATERIAL CHARACTERISTICS Aruan, Immanuel Hareanto; Yuniardi, Yuyun; Khoirullah, Nur; Sophian, Raden Irvan
Journal of Geological Sciences and Applied Geology Vol 8, No 1 (2024): Journal of Geological sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v8i1.56627

On February 3, 2024, a landslide occurred in Nanggerang Village, Sukasari District, Sumedang Regency, West Java Province. The landslide took place on the slopes of local farmland. This event was investigated through an analysis of the characteristics of the landslide material collected immediately after the landslide to determine its cause and mechanism. The landslide slope was divided into three units based on the type and degree of weathering: topsoil (OH), silt soil (MH), and weathered tuff rock. Three undisturbed samples were used in laboratory experiment to determine the materials’ physical characteristics. The physical characteristics of the two soil units, which included silt-sized grains, a specific gravity of roughly 2.6, a unit weight ranging from 21 to 45 kN/m3, and a plasticity index of 16 to 20, were not substantially different, according to the results of the laboratory tests. For the tuff rock, the unit weight was 17.31, water content 48.8, and specific gravity 22.7. The laboratory test results, and studio analysis found that the high water content in the soil due to rainfall caused the two soil units to exceed their liquid limit, resulting in a translational (arc) landslide. The presence of clay minerals due to weathering acted as a catalyst for the landslide. The addition of water from heavy rainfall made the material more fluid, changing the type of landslide to an earth flow.

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