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Facies and Diagenetic Level of the Upper Cibulakan and Parigi Formation, in Randegan and Palimanan Area Jambak, Moeh. Ali; Syafri, Ildrem; Isnaniawardhani, Vijaya; Benyamin, Benyamin; Rodriguez, Hilarius
Indonesian Journal on Geoscience Vol 2, No 3 (2015)
Publisher : Geological Agency

DOI:10.17014/ijog.2.3.157-166This research aims to determine the facies and diagenetic level of limestone of the Upper Cibulakan and Parigi Formations, and also aims to determine the structural correlation between surface and subsurface limestones. Based on thin section analyses taken from the core and outcrop samples, there are four types of lithofacies on the Upper Cibulakan Formation, i.e. mudstone-wackestone, wackestone-packstone, packstone-grainstone, and grainstone facies, and also four types of lithofacies on the Parigi Limestone Formation, i.e. mudstone-wackestone, wackestone-packstone, packstone-grainstone, and lower mudstone-wackestone facies. The analysis of surface and subsurface limestone facies of the Upper Cibulakan and Parigi Formations led to the knowledge of the proportionality and variation of the limestone characteristics on both positions. Limestone of the Upper Cibulakan Formation was deposited locally and discontinuously, whilst the Parigi Formation limestone was deposited evenly and continuously. The structural correlation between the surface and subsurface limestone indicates that these formations were uplifted/exposed due to a local force, likely caused by the intrusion of igneous rocks, as happened in the Kromong Complex. The presence of residual hydrocarbon on the surface of the limestone samples suggests the possibility of potential hydrocarbon trapped in the limestone beneath the surface.

ANALISIS FASIES DAN PETROFISIKA FORMASI TALANG AKAR SUB-CEKUNGAN JAMBI SUMATERA SELATAN Vijaya Isnaniawardhani,Yusi Firmansyah, Andriansyah Permana, Faisal Helmi,
Geoscience Journal Vol 2, No 1 (2018): Padjadjaran Geoscience Journal
Publisher : Unpad

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Pada penelitian ini digunakan data well logging dari tiga sumur eksplorasi di daerah Sub-cekungan Jambi, Sumatera Selatan. Tujuan penelitian ini untuk mengetahui lingkungan pengendapan Formasi Talang Akar sehingga dapat mengetahui gambaran kualitas dari reservoir berdasarkan karakteritik tekstur pada lingkungan pengendapan hasil analisis fasies yang kemudian dibuktikan dengan data petrofisikanya sebagai data kuantitatif reservoir tersebut. Untuk penentuan lingkungan pengendapan dilakukan analisis fasies dari elektrofasies dan lithofasies. Dari elektrofasies diperoleh bentuk kurva log gamma ray Bloky,Bloky Serrated, Funnel, Funnel Serrated, Bell, dan Bell Serrated. Kemudian diperoleh juga lithofasies yang pada umumnya pada bagian bawah setiap sumur tersusun atas batupasir konglomratik sampai batupasir sangat kasar dan pada bagian atas tersusun atas batulempung dengan keterdapatan lapisan batubara dan batugamping sebagai sisipan. Berdasarkan analisis tersebut ditentukan lingkungan pengendapan pada Formasi Talang Akar yaitu berada pada lingkungan darat (fluvial) sampai transisi (estuarine). Analisis kuantitatif berupa perhitungan petrofisika ini dilakukan dengan bantuan perangkat lunak, dalam perhitungan volume shale rumus yang digunakan adalah rumus linear, perhitungan porositas dan saturasi air menggunakan metode Dual Water, dan perhitungan permeabilitas digunakan rumus Timur. Hasil petrofisika ini menunjukan adanya reservoir pada Formasi Talang Akar dengan porositas dan permeabilitas baik-istimewa.Kata Kunci : Lingkungan pengendapan, Reservoir, Formasi Talang Akar

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

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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.

PENENTUAN KAWASAN PERTAMBANGAN BERBASIS SEKTOR KOMODITAS UNGGULAN SUMBERDAYA NIKEL KABUPATEN KONAWE DAN KONAWE UTARA PROVINSI SULAWESI TENGGARA Nursahan, Iwan; Isnaniawardhani, Vijaya; Sulaksana, Nana
Buletin Sumber Daya Geologi Vol 8, No 2 (2013): Buletin Sumber Daya Geologi
Publisher : Buletin Sumber Daya Geologi

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Kabupaten Konawe dan Kabupaten Konawe Utara merupakan bagian dari Kawasan Strategis Nasional (KSN) Soroako dan sekitarnya, yang dicanangkan sebagai wilayah dengan komoditi unggulan pertambangan nikel. Penentuan kawasan pertambangan berbasis komoditi unggulansumberdaya nikel ini menggunakan pendekatan Satuan Genetika Wilayah (SGW) dan memanfaatkan Teknologi Sistem Informasi Geografis (SIG).Valuasi matrik holistik SGW menghasilkan 204 nilai SGW di Kabupaten Konawe dan 248 nilai SGW di Kabupaten Konawe Utara. Valuasi matrik holistik tersebut, menunjukkan adanya keterkaitanÂ aspek potensi dan kendala wilayah terhadap total nilai valuasi SGW. Berdasarkan valuasi SGW dan analisis SWOTÂ kawasan pertambangan prioritas I, maka dapat direkomendasikan bahwa SGW Pedataran Patahan Batuan Ultramafik daerah Langikima dan Wiwirano serta SGW Pedataran Batuan Ultramafik daerah Asera, Andowia, Wiwirano dan Molawe sebagai Kawasan Andalan Pertambangan Nikel, dengan total sumberdaya sekitar 1,14 Milyar Ton, dan nilai valuasi skenario dikembangkan/ditambang berkisar 248 hingga 298.

Sedimentation Process of Rambatan Formation in Larangan Brebes, North Serayu Range, Central Java Astuti, Bernadeta Subandini; Isnaniawardhani, Vijaya; Abdurrokhim, Abdurrokhim; Sudradjat, Adjat
Indonesian Journal on Geoscience Vol 6, No 2 (2019)
Publisher : Geological Agency

DOI:10.17014/ijog.6.2.141-151Rambatan Formation in the western part of North Serayu Basin, Brebes, Central Java, comprises generally flysch facies of turbidite sediments deposited in a deep marine environment. This formation is equivalent to Merawu Formation found in the eastern part of the basin and deposited in the environment of tidal flat to subtidal. The turbidite sediments were highly controlled by a rapid downward movement taking place continuously during Early to Late Miocene. The variation of the depositional environment has been the object of this research which aims to understand the sedimentation process of Rambatan Formation in this type locality with a modern turbidite approach. Rambatan Formation was deposited in N13-N19, as a deep marine sediment channel, turbidite, and deep marine tidal zone. The sedimentation was affected by gravity flow and contourite. The sediments on N13-N14 were marked by turbidite sediments until Middle N17. The sediment supply increased on Middle N17, as a sediment filler on a channel marked by contourite mud layer (muddy slump) and debris flow, with sources from the north. The increase of sediment supply was followed by an environmental transformation from a deep marine channel into deep marine tidal area. In N19, the sediments were redeposited as turbidite sediment, starting with debris flow in Middle N18.

Facies and Diagenetic Level of the Upper Cibulakan and Parigi Formation, in Randegan and Palimanan Area Jambak, Moeh. Ali; Syafri, Ildrem; Isnaniawardhani, Vijaya; Benyamin, Benyamin; Rodriguez, Hilarius
Indonesian Journal on Geoscience Vol 2, No 3 (2015)
Publisher : Geological Agency

DOI:10.17014/ijog.2.3.157-166This research aims to determine the facies and diagenetic level of limestone of the Upper Cibulakan and Parigi Formations, and also aims to determine the structural correlation between surface and subsurface limestones. Based on thin section analyses taken from the core and outcrop samples, there are four types of lithofacies on the Upper Cibulakan Formation, i.e. mudstone-wackestone, wackestone-packstone, packstone-grainstone, and grainstone facies, and also four types of lithofacies on the Parigi Limestone Formation, i.e. mudstone-wackestone, wackestone-packstone, packstone-grainstone, and lower mudstone-wackestone facies. The analysis of surface and subsurface limestone facies of the Upper Cibulakan and Parigi Formations led to the knowledge of the proportionality and variation of the limestone characteristics on both positions. Limestone of the Upper Cibulakan Formation was deposited locally and discontinuously, whilst the Parigi Formation limestone was deposited evenly and continuously. The structural correlation between the surface and subsurface limestone indicates that these formations were uplifted/exposed due to a local force, likely caused by the intrusion of igneous rocks, as happened in the Kromong Complex. The presence of residual hydrocarbon on the surface of the limestone samples suggests the possibility of potential hydrocarbon trapped in the limestone beneath the surface.

Sedimentation Process of Rambatan Formation in Larangan Brebes, North Serayu Range, Central Java Astuti, Bernadeta Subandini; Isnaniawardhani, Vijaya; Abdurrokhim, Abdurrokhim; Sudradjat, Adjat
Indonesian Journal on Geoscience Vol 6, No 2 (2019)
Publisher : Geological Agency

DOI:10.17014/ijog.6.2.141-151Rambatan Formation in the western part of North Serayu Basin, Brebes, Central Java, comprises generally flysch facies of turbidite sediments deposited in a deep marine environment. This formation is equivalent to Merawu Formation found in the eastern part of the basin and deposited in the environment of tidal flat to subtidal. The turbidite sediments were highly controlled by a rapid downward movement taking place continuously during Early to Late Miocene. The variation of the depositional environment has been the object of this research which aims to understand the sedimentation process of Rambatan Formation in this type locality with a modern turbidite approach. Rambatan Formation was deposited in N13-N19, as a deep marine sediment channel, turbidite, and deep marine tidal zone. The sedimentation was affected by gravity flow and contourite. The sediments on N13-N14 were marked by turbidite sediments until Middle N17. The sediment supply increased on Middle N17, as a sediment filler on a channel marked by contourite mud layer (muddy slump) and debris flow, with sources from the north. The increase of sediment supply was followed by an environmental transformation from a deep marine channel into deep marine tidal area. In N19, the sediments were redeposited as turbidite sediment, starting with debris flow in Middle N18.

Facies and Diagenetic Level of the Upper Cibulakan and Parigi Formation, in Randegan and Palimanan Area Jambak, Moeh. Ali; Syafri, Ildrem; Isnaniawardhani, Vijaya; Benyamin, Benyamin; Rodriguez, Hilarius
Indonesian Journal on Geoscience Vol 2, No 3 (2015)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.2.3.157-166

DOI:10.17014/ijog.2.3.157-166This research aims to determine the facies and diagenetic level of limestone of the Upper Cibulakan and Parigi Formations, and also aims to determine the structural correlation between surface and subsurface limestones. Based on thin section analyses taken from the core and outcrop samples, there are four types of lithofacies on the Upper Cibulakan Formation, i.e. mudstone-wackestone, wackestone-packstone, packstone-grainstone, and grainstone facies, and also four types of lithofacies on the Parigi Limestone Formation, i.e. mudstone-wackestone, wackestone-packstone, packstone-grainstone, and lower mudstone-wackestone facies. The analysis of surface and subsurface limestone facies of the Upper Cibulakan and Parigi Formations led to the knowledge of the proportionality and variation of the limestone characteristics on both positions. Limestone of the Upper Cibulakan Formation was deposited locally and discontinuously, whilst the Parigi Formation limestone was deposited evenly and continuously. The structural correlation between the surface and subsurface limestone indicates that these formations were uplifted/exposed due to a local force, likely caused by the intrusion of igneous rocks, as happened in the Kromong Complex. The presence of residual hydrocarbon on the surface of the limestone samples suggests the possibility of potential hydrocarbon trapped in the limestone beneath the surface.

Sedimentation Process of Rambatan Formation in Larangan Brebes, North Serayu Range, Central Java Astuti, Bernadeta Subandini; Isnaniawardhani, Vijaya; Abdurrokhim, Abdurrokhim; Sudradjat, Adjat
Indonesian Journal on Geoscience Vol 6, No 2 (2019)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.6.2.141-151

DOI:10.17014/ijog.6.2.141-151Rambatan Formation in the western part of North Serayu Basin, Brebes, Central Java, comprises generally flysch facies of turbidite sediments deposited in a deep marine environment. This formation is equivalent to Merawu Formation found in the eastern part of the basin and deposited in the environment of tidal flat to subtidal. The turbidite sediments were highly controlled by a rapid downward movement taking place continuously during Early to Late Miocene. The variation of the depositional environment has been the object of this research which aims to understand the sedimentation process of Rambatan Formation in this type locality with a modern turbidite approach. Rambatan Formation was deposited in N13-N19, as a deep marine sediment channel, turbidite, and deep marine tidal zone. The sedimentation was affected by gravity flow and contourite. The sediments on N13-N14 were marked by turbidite sediments until Middle N17. The sediment supply increased on Middle N17, as a sediment filler on a channel marked by contourite mud layer (muddy slump) and debris flow, with sources from the north. The increase of sediment supply was followed by an environmental transformation from a deep marine channel into deep marine tidal area. In N19, the sediments were redeposited as turbidite sediment, starting with debris flow in Middle N18.

KELOMPOK FORAMINIFERA BENTIK RESEN BERDASARKAN KOMPOSISI DINDING CANGKANG DI PERAIRAN TELUK JAKARTA Isni Nurruhwati; Richardus Kaswadji; Dietriech G. Bengen; Vijaya Isnaniawardhani
Jurnal Akuatika Vol 3, No 2 (2012): Jurnal Akuatika
Publisher : Fakultas Perikanan dan Ilmu Kelautan

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Penelitian foraminifera bentik Resen dari 25 sampel sedimen permukaan dasar laut Perairan Teluk Jakarta untuk mengetahui komposisi dinding cangkangnya. Hasil pengamatan kelompok foraminifera bentik Resen ditemukan 86 spesies. Terdapat 74,57 %, berdinding cangkang hyalin, 17,85 % berdinding cangkang porselen dan yang berdinding cangkang agglutinin 7,58 %. Spesies yang paling dominan pada foraminifera bentik berdinding cangkang hyalin adalah Operculina ammonoides (Gronovlus) yaitu 18,02 % dan Elphidium indicum (Cushman) yaitu 10,7 %. Ditinjau dari pola sebaran berdasarkan komposisi dinding cangkang, didominasi oleh sub ordo. Rotaliina yang mempunyai komposisi dinding cangkang calcareous hyalin. Adanya kelompok dominan yang berdinding cangkang hyalin menunjukkan bahwa pada daerah penelitian merupakan lingkungan laut normal dengan kandungan karbonat yang cukup tinggi. Kata Kunci : foraminifera bentik resen, komposisi dinding cangkang, dan teluk jakarta

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