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All Journal Jurnal Ilmiah Dinamika Rekayasa (DINAREK) Biosaintifika: Journal of Biology & Biology Education Jurnal GEOSAPTA Jurnal Geologi Kelautan: Media Hasil Penelitian Geologi Kelautan Syntax Idea
Gentur Waluyo, Gentur
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering

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Struktur Geologi Daerah Longsor di Gunung Pawinihan, Kabupaten Banjarnegara, Jawa Tengah Widagdo, Asmoro; Jati, Indra Permana; Waluyo, Gentur; Purwasatriya, Eko Bayu; Suwardi, Suwardi
Dinamika Rekayasa Vol 10, No 2 (2014): Dinamika Rekayasa - Agustus 2014
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2014.10.2.81

Abstract

Fenomena longsor dapat terjadi dengan berbagai faktor pengontrol. Permasalahan yang di kaji dalam penelitian ini terutama adalah untuk mengetahui hubungan struktural antar lapisan batuan di daerah penelitian. Kondisi struktur dapat menjadi pemicu bagi fenomena longsor. Metode penelitian dilakukan dengan pengamatan dan pemetaan lapangan. Pengukuran struktur geologi berupa kedudukan lapisan batuan dan penentuan hubungan stratigrafis antar batuan dilakukan dilapangan. Pengukuran kelerengan topografi dilakukan di peta dan dilapangan. Daerah penelitian tersusun atas batu lempung dengan sisipan pasir karbonatan sebagai batuan yang tua dan juga tersusun atas breksi sebagai yang lebih muda. Batu lempung sebagai batuan yang mudah tererosi baik secara kimia maupun fisika. Erosi aktif pada batulempung memicu pergerakan masa breksi diatasnya. Hadirnya mata air pada kontak lempung-breksi juga memicu terjadinya longsor. Dengan demikian longsor di daerah penelitian dipicu oleh adanya kontak ketidakselarasan antara batuan breksi segar dan lapuk dengan batulempung di bawahnya.
Pembuatan Model Geologi Bawah Permukaan dengan Metode Geolistrik Dan Studi Stratigrafi pada Rembesan Gas DiJatilawang, Banyumas Purwasatriya, Eko Bayu; Waluyo, Gentur
Dinamika Rekayasa Vol 7, No 2 (2011): Dinamika Rekayasa - Agustus 2011
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2011.7.2.50

Abstract

Banyumas basin is oneof sedimentary basin inIndonesia whichhasn’t proven yet its economical hydrocarbonreserves, although there are several oil and gas seeps in this area which is indicate mature source rocks had been migrated. One of itsgas seep is located on Karanglewas village, Jatilawang, Banyumas which hadbeen flowing its gases since tens years ago. Geoelectrical method and Stratigraphic studyare the methods usedin this research to built a geological subsurface model of Jatilawang’s gas seep.Geoelectrical method isintent to finding the distribution of gas seep over the area and also to finding the direction of fault structure which can be act asa path for gases to flowing up. Stratigraphic study comprise of lithology description, strike and dip measurement, and study of other secondary geological data. Interpreted subsurfacegeological model showing that sandstone dominated bed of Halang Formation is filled by gases and become gas pockets near the surface. Fault direction also interpreted from correlation of these gas pockets and resulting directionof N 115° E and dip of fault plane is45°.Gas flowing through fault and probably the source comes from gas cap of Jatilawang’s anticline. Predicted location of gas cap is about 610 meters to the south, and depthabout 620 meters.
Studi Potensi Minyak Dangkal dengan Pendekatan Metode Statistik Berdasar Data Geologi Permukaan Di Cekungan Banyumas Purwasatriya, Eko Bayu; Waluyo, Gentur
Dinamika Rekayasa Vol 8, No 2 (2012): Dinamika Rekayasa - Agustus 2012
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2012.8.2.103

Abstract

Banyumas basin is part of South Java Fore Arc Basin. Tectonically, Banyumas basin also included in South Central Java Region, where the main structure are trending Northwest – Southeast and Northeast – Southwest. Stratigraphically, the formation sequence from the oldest to the youngest are : Gabon Formation, Pemali Formation, Kalipucang Formation, Rambatan Formation, Halang Formation, Tapak Formation and Alluvium & Volcanic deposits. Banyumas basin and surrounding area have several oil and gas seep. This seep indicating there are mature source rock that had been migrate to the surface. The factor required for existing of hydrocarbon is called petroleum systems, and the factor are : mature source rock, reservoir rock, cap rock/seal rock, trap and proper timing of migration. The study of shallow oil potential is a preliminary step to find the suitable exploration concept for Banyumas basin. This step is used after the discovery of shallow oil accidentally in about 90 meters depth in Tipar Village, Ajibarang sub-district. This study using the surface geological data and secondary data available and also scientific paper, related to Banyumas basin. Statistical method approaching is using the assumption of minimum probability (P10) to estimate the reserves potential of shallow oil that probably exist in Banyumas basin, and the result is the reserves potential about 2,181,937 barrels oil.
Nutrient Limiting Factor for Enabling Algae Growth of Rawapening Lake, Indonesia Piranti, Agatha Sih; Rahayu, Diana Retna Utarini Suci; Waluyo, Gentur
Biosaintifika: Journal of Biology & Biology Education Vol 10, No 1 (2018): April 2018
Publisher : Department of Biology, Faculty of Mathematics and Sciences, Semarang State University . Ro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/biosaintifika.v10i1.12500

Abstract

Two important issues for establishment of nutrient criteria are identifying which nutrient limits algal growth and determining the concentration of that nutrient enabling nuisance growths. The purposes of this research were: 1) to examine the nutrient (TN, TP, ratio of TN/TP) dynamic in Rawapening Lake spatially and temporally, 2) to identify Nutrient Limiting of Algal Growth in Rawapening Lake, and 2) to determine the nutrient criteria for enabling algae growth in Rawapening Lake. The research was conducted using a survey method in 7 sites from February to August 2016. The result showed that spatially Total Nitrogen (TN) and Total Phosphor (TP) in the lake were not evenly distributed and temporally influenced by the inflow. The development of algae biomass in Rawapening Lake determined ratio of TN/TP. Nutrient criteria as follow: oligotrophic was 5.96 - 14.39, mesotrophic was 14.39 - 42.15, eutrophic 42.15 - 51.65, and hyper-eutrophic > 51.65. These criteria could be used in designing controlling eutrophication problem by arranging nutrient input from both external and internal sources in order to meet those limit. The benefits of research contributes to the development of environmental monitoring methods to assess the trophic status using more appropriate in accordance with the conditions of the tropics region. It also could be used for consideration in policy direction and orientation of land use in catchment areas in relation to water quality of the lake.
Paleoproduktivitas Formasi Tapak Banyumas Berdasarkan Bukti Mikrofosil Dwijaya, Bayu Awifan; Prabowo, Romanus Edy; Waluyo, Gentur; Prayitno, Imam
Syntax Idea Vol 3 No 2 (2021): Syntax Idea
Publisher : Ridwan Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36418/syntax-idea.v3i2.1001

Abstract

Tapak formation is a formation that is known to experience many changes in the ancient environment. This research was conducted in Tapak Formation, Mount Tugel, Banyumas Regency using bentonik and nannofosil foraminifera. Relative age analysis showed the sample age was around the initial pliocene, i.e. NN14 to no younger than NN15 (4.2 million years ago to lower than 3.5 million years ago). Paleoecological dynamics observed from abundance and diversity of microfossils experienced a decreased tendency from older samples to younger samples. Changes in paleoproductivity were observed based on primary and secondary productivity, where older samples tended to be higher than younger ones. Toc (Total Organic Carbon) content in older samples has a higher value than younger samples. The value of CaCO3 relatively increased in the younger direction, but in the A21N sample the percentage increased dramatically.
Curug Bayan Sebagai sarana Pembelajaran Geoscience Di Lereng Gunung api Slamet, Banyumas-Jawa Tengah Widagdo, Asmoro; Iswahyudi, Sachrul; Setijadi, Rachmad; Waluyo, Gentur
Geosapta Vol 8, No 2 (2022): JULI 2022
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jg.v8i2.13326

Abstract

Pengunjung dari kalangan akademisi geoscience (geofisika, geologi, geografi dan pertambangan) ke obyek wisata Curug Bayan di lereng selatan Gunung Slamet-Kabupaten Banyumas perlu mendapatkan informasi pembelajaran aspek kebumian (geoscience) pada lokasi yang dikunjunginya. Penggalian nilai ilmiah Curug Bayan perlu dilakukan sebagai informasi kepada masyarakat geoscience  yang tertarik mengetahuinya. Penelitian potensi pembelajaran kebumian di Curug Bayan ini adalah melalui urutan langkah dari kajian publikasi/pustaka dan pengamatan singkapan lapangan. Curug Bayan memiliki makna edukasi kebumian yang penting mengenai aliran lava purba, proses pendinginan lava pijar hingga membentuk batuan beku andesit, mekanisme gerusan air sungai atau erosi sungai vertical, bagian-bagian lereng gunung api, pertambangan, hidrologi dan vegetasi.
IDENTIFIKASI BIOSTRATIGRAFI DAN PALEOENVIRONMENT PADA SUMUR A CEKUNGAN KUTAI KALIMANTAN TIMUR Arrimayah, Amri Rahma; Gibran, Akhmad Khahlil; Waluyo, Gentur; Kurniadi, Dedy
JURNAL GEOLOGI KELAUTAN Vol 22, No 2 (2024)
Publisher : Pusat Penelitian dan Pengembangan Geologi Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/jgk.22.2.2024.881

Abstract

Cekungan Kutai merupakan area penelitian menarik yang kaya sumber daya alam terutama hidrokarbon. Penelitian analisis biostratigrafi ini bertujuan menentukan umur batuan dan lingkungan pengendapan berdasarkan mikrofosil dengan menggunakan palinomorf sebagai indikator utama pada batuan sedien berupa cutting dari sumur pengeboran. Hasil penelitian yang dilakukan di Cekungan kutai menghasilkan bahwa daerah penelitian termasuk kedalam Formasi Balikpapan serta ditindih oleh Formasi Kampungbaru yang secara umum berumur Miosen Tengah hingga Miosen Akhir. Lingkugan pengendapan daerah penelitian merupakan lingkungan pengendapan transisi berupa lower deltaic plain yang mencakup lingkungan berupa mangrove dan backmangrove.
Co-Authors Agatha Sih Piranti Arrimayah, Amri Rahma Asmoro Widagdo, Asmoro Dedy Kurniadi Diana Retna Utarini Suci Rahayu, Diana Retna Utarini Suci Dwijaya, Bayu Awifan Eko Bayu Purwasatriya, Eko Bayu Gibran, Akhmad Khahlil Indra Permana Jati, Indra Permana Nasution, Annio Indah Lestari Prayitno, Imam Rachmad Setijadi, Rachmad Romanus Edy Prabowo Sachrul Iswahyudi