Article Per Year (5 Year)
p-Index From 2021 - 2026
0
P-Index
This Author published in this journals
All Journal Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Scientific Contributions Oil and Gas LEMBARAN PUBLIKASI MINYAK DAN GAS BUMI (LPMGB)
Eko Budi Lelono
Unknown Affiliation
Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Energy

Published : 22 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 22 Documents
Search

 1   2   3 
Oligocene Palynological Zonation Scheme From East Java Sea Eko Budi Lelono; Robert J Morley
Scientific Contributions Oil and Gas Vol 34 No 2 (2011)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.34.2.797

Abstract

Systematic biostratigraphic analyses have been undertaken on the Oligocene clastic and carbonate Kujung Formation from the East Java Sea, North of Madura. The succession has been examined mainly using cutting samples in two wells, using a combination of foraminiferal, nannofossil and palynological analyses at regular spacing. Nannofossil analysis indicates that the Late Oligocene to basal Early Miocene succession is more or less complete, with zones NP24, NP25 and NN1 are all being well developed. In addition, the Early Oligocene is indentified by larger foraminifera indicating the Tc/ Td Letter Stage. Because the traditional palynological zonation of Morley (1978) does not work well in this area, the succession has been divided into broad assemblage zones, which appear to be controlled mainly by climate. These zones are OL-1, OL-2, OL-3, OL-4 and OL-5. Zone OL-1 is based essentially on the absence of seasonal climate and riparian elements, whilst zone OL-2 is characterized by the regular occurrence of seasonal climate elements, especially of Malvacipollis diversus. Zone OL-3 is indicated by common to abundant Dacrydium and Casuarina pollen, with a strong acme of dinoflagellate cysts dominated by Operculodinium spp. and Spiniferites spp., whereas zone OL-4 is marked by abundant Dacrydium and regular Casuarina pollen, but low representation of riparian elements. Finally, the youngest zone is OL-5 which is characterized by reduced Dacrydium and Casuarina pollen, and increased riparian elements. The above palynological zonation suggests climate change, which closely parallels the climate succession from West Java Sea (but with changes less pronounced). Therefore, this study provides a well dated Oligocene palynological zonation which can be applied across Java.
Oligocene Climate Changes of Java Eko Budi Lelono; Robert J Morley
Scientific Contributions Oil and Gas Vol 34 No 3 (2011)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.34.3.803

Abstract

The study of palynology performed on the Oligocene marine sediment of the East Java Sea provides excellent recovery which allows the construction of palynological succession which applies regionally (Lelono et. al., 2011). In fact, this succession is characterized by assemblages that suggest climatic changes. These assemblages are divided into two major groups including mangrove and hinterland. The hinterland pollen group shows the most interesting succession, with elements on the one hand suggesting everwet climates (Dacrydium and Casuarina), and seasonal elements on the other (Gramineae, Schoutenia and Malvacipollis diversus). Mangrove pollen however suggests strong environmental control since mangrove pollen shows different abundance variations in the two wells. The age of the studied succession is independently defined using combined marine micro-fossils of foraminifer and nannoplankton which indicate Early to Late Oligocene. Although for most of the Oligocene in Southeast Asia, seasonal climate assemblages are the rule, this study interpretes the appearence of everwet climates. The Early Oligocene is characterized by common rain forest elements, suggesting an everwet rain forest climate at that time. The early part of the Late Oligocene, however, contains much reduced rain forest elements, and the presence of regular Gramineae pollen, suggesting a more seasonal climate, whereas for the latest Late Oligocene, rain forest (and peat swamp) elements return in abundance, suggesting a very wet rain forest climate. In fact, Java region experienced the wettest climate during Oligocene which probably reflected a wet climate fringe to the eastern margin of Sundaland prior to the collision of the Australian and Asian plates at the Oligo-Miocene boundary.
Pollen Record Of Early/ Middle Miocene Boundary In The South Sumatra Basin Eko Budi Lelono
Scientific Contributions Oil and Gas Vol 32 No 2 (2009)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.32.2.836

Abstract

Early to Middle Miocene sediment obtained from three wells drilled in South Sumatera area has been evaluated for its micropaleontological content including foraminifera, calcareous nannoplankton and palynomorph. The boundary of Early/ Middle Miocene is clearly represented by zone N8/ N9 boundary based on foraminiferal analysis and zone NN4/ NN5 boundary on the basis of calcareous nannoplankton analysis. The rich assemblage of foraminifera and calcareous nannoplankton indicates the occurrence of marine sediment within the well sections. In addition, environmental markers of benthonic foraminifera suggest the occurrence of inner to middle neritic along the studied sections. Palynological analysis however, proves the high occurrence of pollen and spore along the marine successions situated in Early/ Middle Miocene boundary which is the first time to yield a good quality of palynological record. The Early/ Middle Miocene boundary is marked by low sea level in global sea level curve as indicated by significant decrease of foraminifera and calcareous nannoplankton. In addition, palynological record reflects climatic changes over N8/ N9 sediment marking Early/ Middle Miocene boundary with the declines of pollen assemblage suggesting seasonal/ dry climate condition. N8 sediment shows high abundance and diversity of palynomorphs including those of wet climate markers. Palynological assemblage drops gradually approaching foram zone N9/ N8 boundary, whilst seasonal climate indicators increase. On the other hand, palynological record recovers its assemblage over N9 sediment.
The Dispersal Route Of The Australian Elements Of Dacrydium And Casuarina From Its Origin To Se Asia Eko Budi Lelono
Scientific Contributions Oil and Gas Vol 32 No 3 (2009)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.32.3.846

Abstract

This paper proposes the alternative migration route of the Australian elements of Dacrydium and Casuarina from their origin to Southeast Asia. It was previously thought that these Australian affinities dispersed to Sunda region following the collision of the Australian and the Asian plates at the Oligo- cene boundary (Morley, 1998 and 2000).The subsequent study by Lelono (2007) extended the record of these two taxa from the Oligo-Miocene boundary to the base Oligocene. This is unlikely, since at the time of basal Oligocene, when these pollen types first appear, the Australian land mass would have been some 1000 kms south of the East Java area. Therefore, this fact led Lelono (2007) to propose the earlier arrival of the Gondwanan fragment to this area in Early Oligocene. However, recent records of Dacrydium have been reported from the Early Eocene of the Ninety East Ridge (55 Ma) and the Indian subcontinent (50 Ma) (Morley, 2009). This implies to the alternative dispersal route of this pollen. It is possible that Dacrydium dispersed into SE Asia prior to the Early Oligocene via the Ninety East Ridge and the Indian plate, and subsequently its distribution across the Sunda region and Indochina was limited by palaeoclimate, explaining why it is present in some areas of the Sunda region, but not others. Mean while, a model to explain the dispersal of Casuarina remains unresolved, since migration via India is unlikely as there is no pollen record from the Indian subcontinent. Therefore, long distance dispersal may be a possibility for this pollen.
Gondwanan Palynomorphs From The Paleogene Sediments Of East Java The Evidence Of Earlier Arrival Eko Budi Lelono
Scientific Contributions Oil and Gas Vol 30 No 2 (2007)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.30.2.864

Abstract

The palynological investigation of the Paleogene sediments is based on cutting samples collected from the exploration wells which are drilled in East Java area. The occurrence of pollen Meyeripollis naharkotensis and spore Cicatricosisporites dorogensis in the upper well sections suggests the pollen zone of Meyeripollis naharkotensis which is equivalent to Oligocene age. Meanwhile, the occurrence of pollen Proxapertites operculatus and spore Cicatricosisporites eocenicus below Meyeripollis naharkotensis zone indicates the appearance of Proxapertites operculatus zone within the lower sections which is equivalent to Eocene. In addition, foraminiferal and nannoplankton analyses confirm the Oligocene-Eocene age by identifying the occurrence of letter stage of Te4-Tb and nanno zone of NP20-P25. The appearance of the Gondwanan/Australian elements including Dacrydium and Casuarina with common and regular occurrences throughout the studied sections are controversial as these pollen were firstly recorded in the younger sediments (Early Miocene) of other areas such as Northwest Java sea, South Sumatra and Natuna sea following the collision of the Australian plate and the Sundaland in the latest Oligocene. Furthermore, the absence of these palynomorphs within the Paleogene sediments of Central Java and South Sulawesi strengthens the above assumption. Therefore, in regard to East Java, the appearance of Dacrydium and Casuarina may indicate earlier arrival of the Gondwanan/ Australian fragment in this area compared to that in other areas of Indonesia.
Palynology Of The Lower Kalicapung Formation Tlogosari, Central Java Eko Budi Lelono
Scientific Contributions Oil and Gas Vol 25 No 2 (2002)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.25.2.878

Abstract

The palynological investigation focuses on the transition sediment of the Lower Kalipucang Formation which overlies the non-marine lava of the Gabon Formation. Both formations are firmly separated by the unconformity which is indicated by the occurrence of basal conglomerate. The Lower Kalipucang Formation outcrops in a small village called Tlogosari, Central Java. Lithologically, it is characterised by the occurrence of basal conglomerate with the intercalation of thin lignites. This lithology is overlain by 2 meter thick of claystone containing lignite strings and some igneous fragments. The intercalation of thin sandstones, conglomerate and lignites are found within claystone lithology. Four samples from the Lower Kalipucang Formation were selected for laboratory processing. Only two samples collected from the upper part of this formation yield rich palynomorphs. The palynomorph assemblage shows the occurrence of brackish and fresh water floras. Based on the appearance of pollen Florschuetzia meridionalis and F. trilobata, it is predicted that the age of the Lower Kalipucang Formation is Middle Miocene. The high abundance of mangrove taxa (especially in sample number LKP-4) such as Avicenia type, Zonocostites ramonae and Camptostemon indicates a well development of mangrove environment. This assumption is supported by well preservation of large mollusc with excellent ornamentation. This ornamentation must have developed in the environment with low energy such as mangrove.
The Use of Palynology in Sequence Stratigrafy Analysis a Case Study, The Eocene Nanggulan Formation Eko Budi Lelono
Scientific Contributions Oil and Gas Vol 23 No 3 (2000)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.23.3.882

Abstract

This paper is a part of palynological investigationon The Eocene Nanggulan Formation, Yogjakarta Central Java. The Nanggulan Formation containing rich palynomorph assemblage provider excellent data to support sequence stratigraphy analysis. The palynomorph assemblage changes (especially between mangrove and freshwater palynomorphs) may reflect sea level changes whitch can be used to interpret system tracts, which are the internal building blocks of sequences.
PALYNOLOGICAL INVESTIGATION OF THE OLIGOCENE SEDIMENT IN EAST JAVA SEA Eko Budi Lelono
Scientific Contributions Oil and Gas Vol 30 No 1 (2007)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.30.1.970

Abstract

The palynological study of the Oligocene sediments is based on cutting samples collected from the exploration wells which are drilled in East Java Sea. The occurrence of pollen Meyeripollis naharkotensis along the well sections suggests the pollen zone of Meyeripollis naharkotensis which is equivalent to Oligocene age. This is supported by the regular occurrence of the Oligocene marker of the trilete spore of Cicatricosisporites dorogensis along the studied well sections. In addition, foraminiferal and nannoplankton analyses confirm the Oligocene age by identifying the occurrence of letter stage of Tc- Te4 and nanno zone of NP21-NP25. On the other hand, most palynomorphs marking Eocene age disappear from the studied wells as they are stratigraphically older than the studied sediments. Unlike the Oligocene sediment of West Java and Central Sumatra which was formed in the freshwater swamp or lake under dry climate condition, the studied sediment was deposited in the transition to shallow marine environment as indicated by the moderate diversity of marine dinoflagellates coupled with the frequent occurrence of limestone along the sections. Furthermore, the regular appearance of back-mangrove pollen of Spinizonocolpites echinatus throughout the well sections supports the indication of marine influence. The appearance of the Australian immigrants including Dacrydium (common occurrence) and Casuarina (regular occurrence) may indicate earlier arrival of the Australian continent in this area compared to that in other areas of Indonesia.
Potensi Hidrokarbon Sedimen Pra--Tersier Daerah Atambua, Timor Barat Eko Budi Lelono; Djoko Sunarjanto; Abdul Kholiq
Lembaran publikasi minyak dan gas bumi Vol 50 No 2 (2016)
Publisher : BBPMGB LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/LPMGB.50.2.715

Abstract

Di Atambua dan sekitarnya dijumpai rembesan minyak dan gas di beberapa lokasi. Namun eksplorasi migas belum dilakukan secara intensif sehingga potensinya belum banyak terungkap. Penelitian ini difokuskan pada geologi batuan pra Tersier untuk mengetahui dan mengidentifikasi potensi hidrokarbonnya, untuk memastikan daerah ini layak untuk ditawarkan kepada investor. Metode yang dilakukan diawali studi literatur dan penelitian terdahulu, interpretasi data citra satelit, survei lapangan, analisis laboratorium dan integrasi data. Penelitian ini menghasilkan temuan baru berupa sedimen air tawar (diduga danau) produk syn-rift berumur Perm, sehingga terbuka peluang adanya sistem petroleum umur Paleozoikum. Secara umum disimpulkan bahwa elemen-elemen sistem petroleum sudah terbentuk di Wilayah Atambua dan sekitarnya, antara lain: serpih Perm Formasi Bisane dan batulempung Trias Formasi Aitutu berperan sebagai batuan sumber. Batupasir Perm Formasi Bisane dan batupasir Jura Formasi Oebaat dapat bertindak sebagai reservoar, sedangkan batulempung Jura Formasi Wailuli berpotensi sebagai penyekat. Perangkap migas yang berhasil diidentifikasi berupa struktur basement involved thrust dan imbricated fault.
Penelitian Palinologi pada Sedimen Paleogen di Kawasan Indonesia Bagian Barat Eko Budi Lelono
Lembaran publikasi minyak dan gas bumi Vol 39 No 2 (2005)
Publisher : BBPMGB LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/LPMGB.39.2.734

Abstract

Singkapan sedimen umur Paleogen yang terdapat di Indonesia Barat sangat terbatas jumlahnya. Hal ini terutama disebabkan oleh aktivitas tektonik yang intensif yang berlangsung bersamaan dan sesudah umur Paleogen, yang mengakibatkan formasi umur ini tertimbun jauh di bawah permukaan. Sedangkan sedimen Paleogen yang didapat dari pemboran eksplorasi sulit diperoleh karena bersifat rahasia. Oleh karena itu tidak mengherankan kalau penelitian palinologi terhadap sedimen umur ini masih terbatas jumlahnya. Meskipun demikian, gambaran umum palinologi umur Paleogen sedikit banyak sudah terungkap. Sebagai buktinya beberapa peneliti telah menyusun zonasi polen untuk umur Paleogen seperti Morley (1991) dan Rahardjo dkk. (1994). Penelitian paling lengkap terhadap sedimen Paleogen tertua dilakukan oleh Muller (1968) terhadap Formasi Kayan (dulu bernama Plateau Sandstone) berumur Paleosen- Eosen Awal yang tersingkap di Sarawak. Keragaman polen dari formasi ini rendah dibandingkan dengan keragaman polen masa kini yang ada di Dataran Sunda dan umumnya tidak mempunyai kesamaan dengan spesies modern. Di antara sedimen Paleogen yang paling kaya dengan kandungan palinomorf adalah Formasi Nanggulan berumur Eosen Tengah-Akhir yang tersingkap di desa Nanggulan, D. I. Yogyakarta. Beberapa penelitian dilakukan pada formasi ini antara lain oleh Barton (1988), Morley dan Harley (1995), dan Lelono (2000). Keragaman dan kelimpahan polen pada Formasi Nanggulan sangat tinggi terutama pada sedimen umur Eosen Tengah menunjukkan kondisi iklim basah tropis yang memungkinkan terbentuknya hutan tropis yang lebat. Selain itu, penelitian yang telah dilakukan memperlihatkan kehadiran palinomorf yang berasal dari India. Hal ini membuktikan bahwa telah terjadi migrasi tumbuhan dari India ke wilayah Asia Tenggara karena menyatunya kedua daerah tersebut akibat tumbukan antara Lempeng India dan Lempeng Asia yang diperkirakan berlangsung pada Eosen Tengah (Hall, 1998). Pada Oligosen Awal proses rifting dan subsid- ence (yang sudah dimulai pada Eosen Akhir) terus berlanjut yang ditandai dengan pembentukan pull-apart basin di beberapa daerah seperti Laut Cina Selatan, Sumatra dan Laut Jawa Barat Utara (Morley, 2000). Pada fase awal pembentukan pull-apart basin ditandai oleh terbentuknya endapan danau atau darat lainnya yang dibuktikan dengan dominasi alga air tawar Pediastrum spp. seperti ditemukan pada Cekungan Jawa Barat Utara. Mendekati umur Oligosen Akhir proses penurunan cekungan (subsidence) berlangsung sangat intensif pada area yang luas. Proses ini ditambah dengan kenaikan muka laut menyebabkan penyusutan daratan akibat penggenangan air laut, sehingga sedimentasi umumnya terjadi di lingkungan transisi sampai laut dangkal. Hal ini ditandai oleh kehadiran beragam palinomorf air payau (mangrove dan back- mangrove) pada penampang sumur umur Oligosen Akhir seperti dijumpai di Cekungan Jawa Barat Utara dan Jawa Timur Utara. Secara umum, keragaman dan kelimpahan palinomorf umur Oligosen jauh rendah dari pada umur Eosen. Hal ini disebabkan kondisi iklim lebih kering yang mendominasi umur Oligosen, meskipun di beberapa tempat dipengaruhi oleh iklim basah.
Co-Authors Abdul Kholiq Andy Setyo Wibowo Arifin Budi Mulyana Christina Ani Setyaningsih David Victor Mamengko dedi kurniadi Djoko Sunarjanto Hermes Panggabean Irwansyah Irwansyah Iskandar Firdaus Iyan Haryanto Juwita Trivianty Musu L Nugraha Ningsih L Nugrahaningsih L. Nugrahaningsih Nugrahaningsih Nugrahaningsih Nugrahaningsih Nur Hasjim Panuju Panuju Panuju Panuju Robert J Morley Siti Helmyati Tatang Padmawidjaja Yoga B.Sendjadja