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All Journal Jurnal RISET Geologi dan Pertambangan Berita Sedimentologi Bulletin of Geology
Wahyu Dwijo Santoso
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Earth & Planetary Sciences Energy Engineering

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SEDIMENTARY FACIES AND HYDROCARBON RESERVOIR POTENTIAL OF SAND FLAT IN THE UPPER PART OF TAPAK FORMATION IN BANYUMAS AREA, CENTRAL JAVA Yan Rizal; Wahyu Dwijo Santoso; Alfend Rudyawan; Ricky Adrian Tampubolon; Affan Arif Nurfarhan
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 28, No 2 (2018)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2392.507 KB) | DOI: 10.14203/risetgeotam2018.v28.835

Abstract

The upper part of Tapak Formation in Kali Cimande consists of alternating sandstones, siltstone and mudstone. The alternating sequence showed a fining and thinning upward bedding pattern. The facies association of the alternation built up by sand flat facies, which characterized by medium sandstone, moderate sorted, with cross-lamination sedimentary structures and mostly on the top of sandstone layer found a bioturbation trace fossils (Skolithos). Mixed flat facies, which is characterized by an alternation of thin layered sandstones with mudstone and siltstone, with lenticular, wavy, and flaser sedimentary structures, contained many forms of bioturbation, such Planolites, Thallasinoides, Lockeia, and Ophiomorpha. Mud flat facies association, is characterized by a repeated of claystone with thin sandstone intercalation, where the ratio of clay content more than 95 % of the total layers, contained abundantly with trace fossil Lockeia. Upper Tapak Formation plays as moderate reservoir potential. The thick sandstone in sand flat facies with moderate to poorly sorted and moderate porosity is required to provide hydrocarbon flows in Banyumas Basin.Bagian atas Formasi Tapak di Kali Cimande terdiri dari perselingan batupasir-batulanau dan mudstone. Sekuen perselingan menunjukkan pola perlapisan menghalus dan menipis ke atas. Asosiasi fasies tersebut terdiri dari fasies sand flat, yang dicirikan oleh batu pasir sedang, pemilahan sedang, struktur sedimen silang-siur serta fosil jejak bioturbasi (Skolithos) pada bagian puncak kebanyakan lapisan batu pasir. Fasies mixed flat, dicirikan oleh perselingan batupasir berlapis tipis dengan mudstone dan batulanau, serta struktur sedimen lentikular, perlapisan bergelombang, dan flaser, mengandung banyak bioturbasi, seperti Planolites, Thallasinoides, Lockeia, serta Ophiomorpha. Asosiasi Fasies sand flat, dicirikan oleh perulangan batulempung dengan sisipan batupasir tipis, dengan kandungan lempung lebih dari 95% total lapisan, serta fosil jejak Lockeia yang melimpah. Formasi Tapak Atas berperan sebagai reservoir potensial sedang. Bagian batupasir tebal di fasies sand flat dengan pemilahan sedang hingga buruk dan porositas sedang diperlukan untuk menyediakan aliran hidrokarbon di Cekungan Banyumas.  
KONDISI PAELOSALINITAS PADA MIOSEN AKHIR–PLEISTOSEN DI CEKUNGAN JAWA TIMUR UTARA, INDONESIA, BERDASARKAN PERUBAHAN POPULASI NANOPLANKTON Wahyu Dwijo Santoso; Halmi Insani; Rubiyanto Kapid
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 24, No 1 (2014)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1987.875 KB) | DOI: 10.14203/risetgeotam2014.v24.77

Abstract

Abstract Quantitative biostratigraphy analysis by observing Sphenolithus abies and Helicosphaera carteri could predict paleosalinity changes at a sedimentary basin diachronically. Hyposaline conditions can be investigated from the abundance changes of Helicosphaera carteri and Calcidiscus leptoporus counts. Along this line, the increasing number of Sphenolithus abies demonstrates particular states of normal saline. Paleosalinity changes in the North East Java Basin, from Late Miocene to Pleistocene were identified from the top of Wonocolo Formation to bottom of Ledok Formation. Paleosalinity along this episode was interpreted as hyposaline condition. While at the top of Ledok Formation to Mundu Formation; paleosalinity had changed to normal saline. Furthermore, environmental conditions return to hyposaline when Selorejo Formation sediment was deposited. And during the deposition of Lidah Formation, deposition environment had returned to the normal saline.
STUDI DIAGENESIS BATUPASIR PADA ASOSIASI FASIES CHANNEL-FILL FORMASI HALANG Yan Rizal; Ricky Adrian Tampubolon; Wahyu Dwijo Santoso
Bulletin of Geology Vol 3 No 1 (2019): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2019.3.1.2

Abstract

Diagenesis pada asosiasi fasies channel-fill menunjukkan adanya proses kompaksi, sementasi, rekristalisasi, dan pelarutan. Proses kompaksi pada channel-1 dan channel- 2 ditandai dengan adanya kontak antarbutir berupa kontak point, long, dan suture. Derajat kompaksi semakin meningkat pada sampel yang diambil pada dasar channel. Pada channel- 1 terjadi rekristalisasi gelas menjadi mineral lempung dan rekristalisasi kuarsa, sedangkan pada channel- 2 hanya rekristalisasi gelas menjadi mineral lempung. Pelarutan yang terjadi pada channel- 1 berupa pelarutan mineral piroksen, plagioklas dan cangkang foraminifera, dan pada channel- 2 hanya pelarutan mineral piroksen. Adanya penambahan mineral lempung selama diagenesis berlangsung mengurangi nilai porositas, karena mineral lempung dapat mengisi ruang antar butiran pembentuk batuan, sehingga batupasir Formasi Halang memiliki potensi rendah sebagai reservoir hidrokarbon. Kata kunci: Diagenesis, channel-fill, foraminifera, Formasi Halang, hidrokarbon
Quaternary nannoplankton in the Northeast Java Basin Kapid, Rubiyanto; Santoso, Wahyu Dwijo; Insani, Halmi
Berita Sedimentologi Vol 47, No 3 (2021)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (876.714 KB) | DOI: 10.51835/bsed.2021.47.3.357

Abstract

In Indonesia, nannofosils are commonly used for age estimation on Miocene marine sediment, but they are rarely performed on Quaternary sediment. This paper introduces two nannofossil biozones, Martini (1971) and Backman et al. (2012) and the comparison between the two biozones. An uninterrupted interval of marine sediments was described and picked for quantitative nannoplankton analysis. The samples were taken from Ledok Formation to Lidah Formation in Pati Region, Northeast Java Basin. The samples were prepared by quick smear slides method and and analyzed by quantitative field of view method. Martini (1971) biozone can be used to subdivide the Late Miocene–Pleistocene sediments into 5 biozones, but Backman et al. (2012) can be used to classify the same sediments into 8 biozones. The biozone subdivision from Backman et al. (2012) is more detailed than that of Martini (1971) because an updated dating and biozone in the three new dating zone data.
Co-Authors Affan Arif Nurfarhan Alfend Rudyawan Halmi Insani Ricky Adrian Tampubolon Rubiyanto Kapid Yan Rizal Yan Rizal