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All Journal Bulletin of Scientific Contribution : Geology BERKALA SAINSTEK IJOG : Indonesian Journal on Geoscience Dharmakarya : Jurnal Aplikasi Ipteks Untuk Masyarakat Jurnal Ilmiah Dinamika Rekayasa (DINAREK) Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Buletin Sumber Daya Geologi Jambura Geoscience Review Teknologi Indonesia Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)

Undang Mardiana

Fakultas Teknik Geologi, Universitas Padjadjaran

Author-ID : 2694790

Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mathematics Physics Public Health

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FASIES PENGENDAPAN BATUBARA SEAM X25 FORMASI BALIKPAPAN BERDASARKAN LOG INSIDE CASING DI DAERAH SEPARI, KABUPATEN KUTAI KARTANEGARA, PROVINSI KALIMANTAN TIMUR Dany Margaesa; Vijaya Isnaniawardhani; Undang Mardiana
Buletin Sumber Daya Geologi Vol. 8 No. 3 (2013): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Cekungan Kutai terletak di Kalimantan Timur menyimpan banyak kandungan sumber daya alam yang melimpah, seperti endapan batubara. Daerah penelitian secara geologi termasuk ke dalam Formasi Balikpapan yang dicirikan oleh keterdapatan litologi batupasir lepas (loose sand). Penggunaan Log Inside Casing merupakan salah satu solusi terbaik dalam pengambilan data well logging di Formasi Balikpapan ini untuk mengatasi beberapa kendala, seperti runtuhnya lubang bor dalam batuan sedimen lepas. Dengan metode Log Inside Casing ternyata terjadi penurunan kualitas pembacaan log sekitar 50% terutama pada Log Density. Namun demikian Log Gamma Ray masih sangat baik digunakan dalam interpretasi tekstur batuan sedimen sehingga suksesi sedimen dapat dipelajari sebagai aplikasi dari elektrofasies.Batubara seam X25 dibedakan menjadi dua fasies berbeda dan diendapkan pada lingkungan Transitional Lower Delta Plain yang dicirikan oleh pola fasies crevasse splay, channel, levee dan interdistributary bay berdasarkan model Horne (1978). Penelitian ini dapat mengkoreksi korelasi litostratigrafi dan perhitungan sumberdaya batubara berdasarkan genesa batubaranya secara tepat, akurat dan ilmiah.

PENDUGAAN NILAI TAHANAN JENIS BATUAN UNTUK MENGETAHUI STRUKTUR GEOLOGI PADA ENDAPAN VULKANIK DI KEC. PADARINCANG, PROVINSI BANTEN. Cipta Endyana; Febri Hirnawan; Hendrawan Hendrawan; Undang Mardiana
Buletin Sumber Daya Geologi Vol. 6 No. 3 (2011): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Pendugaan nilai-nilai tahanan jenis batuan menggunakan metode Schlumberger merupakan pendekatan yang efektif untuk menduga kondisi batuan bawah permukaan. Penggunaan teknik interpolasi danpengelompokkan nilai tahanan jenis lebih lanjut dapat menafsirkan kontinuitas lateral jenis batuan dan struktur geologi.Pengolahan dan pengujian secara statistik analisis regresi berganda pada nilai tahananjenis menghasilkan enam jenis kelompok batuan, yaitu: Breksi grain supported, Tuf Lapili, Tuf Kasar, Breksi grain supported, tuf lapili, breksi matrix supported. Hasil uji korelasi pada karakter tahanan jenis keenam kelompok batuan tersebut ditemukan bahwa ada tiga sumber material yang berbeda pada saat pengendapannya. Material endapan diyakini berasal dari Gunung Parakasak, Gunung Karang dan Gunung Kamuning. Kesamaan nilai tahanan jenis pada pola berarah barat-timur menunjukkan kesamaan litologi, sedangkan kesamaan nilai tahanan jenis pada pola dengan arah utara-selatan menunjukkan nilai kontras tahanan jenis yang disebabkan oleh dua jenis sesar berarah relatif barat-timur dengan mekanisme yang berbeda.

ALTERASI DI SUMUR PENGEBORAN SMN-1 DAN SMN-2 DI DAERAH PANAS BUMI SUMANI, KABUPATEN SOLOK, PROPINSI SUMATERA BARAT Sukaesih Sukaesih; Yuanno Rezky; Mega Fatimah Rosana; Undang Mardiana
Buletin Sumber Daya Geologi Vol. 10 No. 3 (2015): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Daerah penelitian berada di lokasi sumur pengeboran SMN-1 dan lokasi sumur pengeboran SMN-2 berada di daerah panas bumi Sumani, Kabupaten Solok, Provinsi Sumatera Barat. Penelitian dilakukan untuk mengetahui tipe alterasi bawah permukaan dalam lingkungan sistem panas bumi daerah Sumani. Metode yang digunakan adalah melakukan deskripsi megaskopis, mikroskopis dananalisis karakterisasi terhadap batuan inti dari sumur SMN-1 (702 meter) dan SMN-2 (428 meter). Dilakukan juga pengukuran suhu pada sumur SMN-1 dan SMN-2 untuk mengetahui anomali gradien geothermal. Berdasarkan hasil penelitian diketahui jenis-jenis mineral yang terbentuk dalam batuan bawah permukaan dan tipe ubahan serta korelasi zonasi alterasi bawah permukaan. Mineral ubahan yang dijumpai dalam batuan inti sumur SMN-1 terdiri dari; montmorilonit, smektit, sulfat, silika, halit, hematit, oksida vanadium, arsenat, karbonat, zeolit, ilit, pirofilit, klorit, muskovit, dan opal. Mineral ubahan yangterbentuk dalam sumur SMN-2 terdiri dari; kaolinit, montmorilonit, smektit, hematit, posfat, silikat, zeolit dan karbonat. Berdasarkan hasil pengelompokan mineral ubahan yang terbentuk dalam batuan bawah permukaan, sumur SMN-1 didominasi oleh tipe argilik (hingga kedalaman 100 meter) dan tipe propilitik (100-702 meter), sedangkan Sumur SMN-2 merupakan tipe ubahan argilik. Gradien geothermal dari permukaan hingga kedalaman 700 m di sumur SMN-1 menunjukkan ratarata 12,86 o C/100 meter, sedangkan di sumur SMN-2 diperoleh rata-rata 7 derajat C/100 meter.

Contribution of Resistivity Properties in Estimating Hydraulic Conductivity in Ciremai Volcanic Deposits Deden Zaenudin Mutaqin; Hendarmawan Hendarmawan; Agus Didit Haryanto; Undang Mardiana; Febriwan Mohammad
Jambura Geoscience Review Vol 5, No 1 (2023): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34312/jgeosrev.v5i1.17333

The hydraulic parameters of porous media, such as porosity (φ) and hydraulic conductivity (K), are the most important factors for planning and managing water exploitation from aquifers. This study aims to estimate the hydraulic conductivity parameters using the geoelectric method on volcanic deposits on the northern slope of Mount Ciremai. For this purpose, four data types were used to estimate K and φ, including lithological profiles, water table, groundwater quality, pumping test data, and vertical electrical sounding (VES). Based on Archie's law and Kozeny's equation, we get the alpha (α) values and cementation factor (m) from which the median values of α = 1.01 and m = 1.36 represent the studied aquifer. The porosity (φ) of the aquifer varies from 0.097 to 0.187 with an average of 0.141 and is spatially related to the hydraulic conductivity (kgm), which varies from 4.97 × 10-6 to 6.75 × 10-5 m/s after the application of Kozeny's equation. The hydraulic conductivity (Kp) calculated from the pumping tests varies from 9.07 × 10-6 to 1.06 × 10-4 m/s and is strongly correlated (r = 0.87). Furthermore, a relation between resistivity and hydraulic conductivity was established for the studied aquifer to estimate these parameters in sites lacking data.

KARAKTERISTIK ALTERASI BAWAH PERMUKAAN DI LAPANGAN PANAS BUMI “X”, KABUPATEN SUKABUMI, PROVINSI JAWA BARAT : CHARACTERISTICS ALTERATION OF SUB-SURVEY IN “X” GEOTHERMAL FIELD, SUKABUMI, WEST JAVA PROVINCE Flaurentina Nadya; Aton Patonah; Undang Mardiana; Mochammad Nurhadi
Buletin Sumber Daya Geologi Vol. 17 No. 3 (2022): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v17i3.356

Indonesia is one of the countries that has the largest geothermal potential in the world. One of them is located in Sukabumi Regency, West Java. In order to optimize geothermal potential, research on geothermal characteristics is needed, one of which is the study of alteration minerals in geothermal manifestations. This research is focused on alteration studies using coring and cutting data from the drilling of Well X. The sequence of rocks in Well X from oldest to younger succession consists of lake deposits, altered tuff, altered tuff breccias, altered dacite, altered andesite, altered andesite breccias and late volcanic breccias. which is divided into two volcanic periods, namely the Pliocene period from the eruption of Mount Citorek and the Pleistocene from the eruption of Mount Halimun and Mount Tapos. Based on the assemblage of alteration minerals, the alteration zone in Well X is divided into 3 zones, namely the smectite-chlorite zone at a depth of 24 to 600 MD, illite-chlorite zone at a depth of 600 to 700 MD, and the chlorite-smectite zone at a depth of 700 to 821 MD. Based on the mineral composition and alteration zone, the type of alteration in Well X is sub-prophylitic with neutral pH and temperature 200-300°C and can act as a containment zone and judging from the appearance of manifestations controlled by the structure, the study area is in the outflow zone.

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v16i4.34

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

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.

NILAI DAN JENIS POROSITAS BATUPASIR PADA FORMASI WALATDI DAERAH CICANTAYAN, KABUPATEN SUKABUMI BERDASARKAN METODE PETROGRAFI Firmansyah, Yusi; Mardiana, Undang; Kurniawan, Endy; Nurdrajat, .; Gani, Reza Mohammad Ganjar
Bulletin of Scientific Contribution Vol 16, No 3 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRACTStudy of sandstone porosity Walat Formation in Sukabumi, West Java is a step to get information about the value and type of porosity that develops in this area. Sandstones that have good porosity can potentially become reservoir rocks but not all sandstones have good porosity. Systematic modeling of Walat Formation outcrops which are believed to have potential as reservoir rocks are analyzed in the laboratory to see their porosity. Eight samples were selected and analyzed by petrographic method to determine the type of porosity and calculate the sandstone porosity value of the Walat Formation located in Cicantayan Village, Cisaat District, Sukabumi District. Based on the results of petrographic analysis, all sandstone samples in the study area have intergranular primary porosity and have sufficient to special porosity values. Based on this research, it can be said that in general the sandstones in the study area have very good porosity which has the potential to be a good reservoir rock.Keywords: Walat Formation, sandstone, porosity, petrographic analysis.ABSTRAKKajian porositas batupasir Formasi Walat di Sukabumi, Jawa Barat merupakan suatu langkah untuk mendapatkan informasi mengenai nilai dan jenis porositas yang berkembang pada daerah ini. Batupasir yang memiliki porositas yang baik dapat berpotensi menjadi batuan reservoir namun tidak semua batupasir memiliki porositas yang baik. Sistematika pemercontohan singkapan Formasi Walat yang diyakini berpotensi sebagai batuan reservoar di analisis ke laboratorium untuk dilihat porositasnya. Sebanyak delapan percontoh terpilih dan dianalisis dengan metode petrografi untuk mengetahui jenis porositas serta menghitung nilai porositas batupasir Formasi Walat yang terletak di desa Cicantayan, Kecamatan Cisaat, Kabupaten Sukabumi. Berdasarkan hasil analisis petrografi semua percontoh batupasir di daerah penelitian memiliki porositas primer intergranular dan memiliki nilai porositas yang cukup hingga istimewa. Berdasarkan penelitian ini dapat dikatakan secara umum batupasir didaerah penelitian memiliki porositas yang sangat baik sehingga berpotensi menjadi batuan reservoir yang baik.Kata Kunci: Walat Formation, sandstone, porosity, petrographic analysis.

SISTEM POROSITAS RESERVOIR BATUAN KARBONAT PADA SEKUEN DROWNING CAP, FORMASI KUJUNG ATAS DI LAPANGAN VITA, CEKUNGAN JAWA TIMUR DEWI, VISKA TRIARAMINTA; Mardiana, Undang; Mohammad, Febriwan; Ahdyar, LaOde
Bulletin of Scientific Contribution Vol 17, No 2 (2019): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRAKBatuan karbonat merupakan batuan yang banyak ditemukan sebagai batuan reservoir. Hal ini tentu dikarenakan batuan karbonat memiliki nilai porositas dan permeabilitas yang baik. Namun, tingginya kompleksitas dan heterogenitas dari batuan karbonat membuat suatu kualitas reservoir batuan karbonat sulit di prediksi. Distribusi sistem porositas batuan karbonat sangat dikontrol oleh litofasies dan juga proses diagenesis. Maka, interaksi dari kedua faktor tersebut akan menghasilkan variasi jenis porositas yang nantinya akan mempengaruhi nilai permeabilitas dari suatu reservoir.Objek penelitian ini adalah Reservoir Vita yang merupakan karbonat build up, berumur Oligosen hingga Miosen di Formasi Kujung Atas. Reservoir ini telah menjadi produsen minyak terbesar di Indonesia dan saat ini telah menghasilkan sejumlah hidrokarbon yang banyak. Dengan menggunakan data batuan inti sepanjang 429 ft (keseluruhan) dan lebih dari 500 sayatan tipis pada 3 sumur, penelitian ini bertujuan untuk mengetahui variasi dari sistem pori pada sekuen Drowning Cap di Reservoir Vita. Analisa kualitatif dilakukan untuk mendeterminasi jenis porositas reservoir yang terdiri atas interparticle, separated vugs (moldic), touching vugs, microfracture, dan minimum dissolution. Kelima jenis porositas ini terbentuk pada litofasies yang berbeda-beda. Tentu hal ini menunjukkan bahwa, sistem porositas pada objek penelitian tidak hanya dikontrol oleh tekstur, melainkan oleh proses diagenesis yang terjadi. Pemahaman terkait sistem porositas di reservoir drowning cap ini tentu menghasilkan dampak yang baik untuk mengetahui distribusi kualitas reservoir yang komprehensif. Kata Kunci : Jenis porositas, diagenesis, Reservoir Batuan Karbonat ABSTRACTCarbonate rocks known as one of a common major reservoir rock in the world due to its good porosity and permeability. However, its heterogeneity makes the variability of carbonate reservoir quality is difficult to predict. Carbonate pore system distribution is controlled by the lithofacies and also by the occurrence of diagenetic process. Therefore, this interaction results the variation of pore types that will eventually define the permeability of the reservoir.The object of this research is Reservoir Vita which is an Oligocene to Miocene carbonate build up reservoir, specifically in Drowning Cap Sequence. Vita Reservoir is located in East Java Basin, Upper Kujung Formation which has becoming the largest oil producer in Indonesia and currently it has been producing a significant amount of hydrocarbon. By using cores (429 ft in total) and more than 500 thin sections data from 3 wells, this research aims to observe the variety of total pore system in drowning cap sequence in Reservoir Vita. Qualitative analysis was done in determining the pore types of reservoir that consist of interparticle, separated vugs (moldic), touching vugs, microfracture, and minimum dissolution. These five pore types are encountered in wide variety of lithofasies or depositional facies. Thus, this observation has proved that the pore system distribution in research object, is not only mainly controlled by its texture, but also strongly controlled by diagenetic process and it results different value of porosity and permeability. Understanding of pore system in drowning cap reservoir will bring significant value comprehensive reservoir quality distribution. Keywords: Pore types, Diagenetic prosses, Carbonate Reservoir

Co-Authors Adi Hardiyono, Adi Agus Didit Haryanto Ahdyar, LaOde Andi Agus Nur, Andi Agus Aton Patonah Boy Yoseph Cahya Sunan Sakti Syah Alam Budi Muljana Cipta Endyana Dany Margaesa Deden Zaenudin Mutaqin Deden Zaenudin Mutaqin Deden Zaenudin Mutaqin Deden Zaenudin Mutaqin DEWI, VISKA TRIARAMINTA Emi Sukiyah Febri Hirnawan Febri Hirnawan Febriwan Mohamad, Febriwan Febriwan Mohammad Febriwan Mohammad Febriwan Mohammad Febriwan Mohammad, Febriwan Fikri Abdullah Fikri Abdullah, Fikri Flaurentina Nadya GANI, REZA MOHAMMAD GANJAR Gilang Firmansyah, Gilang Hendarmawan Hendarmawan Hendrawan Hendrawan Hendrawan Hendrawan Ibrahim, Farrel Malik Kurniawan, Endy Margaesa, Dany Margaesa, Dany Mega Fatimah Rosana Mega Fatimah Rosana Mochammad Nurhadi Mohamad Sapari Hadian Muhammad Kurniawan Alfadli Munib Ikhwatun Iman Munib Ikhwatun Iman Mutaqin, Deden Zaenudin Nanda Natasia Nurdrajat Nurdrajat Oman Abdurahman Oman Abdurahman Prahara Iqbal Rezky, Yuanno Rezky, Yuanno Saputro, Julian Sukaesih Sukaesih Sukaesih Sukaesih, Sukaesih Vijaya Isnaniawardhani Yuanno Rezky Yusi Firmansyah, Yusi Yuyun Yuniardi Yuyun Yuniardi

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