Pre-Tertary Basin di Sumatra

Moderator-moderator: Prihatin Tri S, arulkamil

Pre-Tertary Basin di Sumatra

Postoleh Prihatin Tri S » Rab Mar 25, 2015 8:12 am

Pagi :luv-indonesia:

Kemarin ekskursi lapangan di sekitaran Padang (di Tambang Semen Padang/Indarung) saya ketemu litologi Batugamping Mesozoic kontak dengan chert ? kontak dengan batubara... lingkungan bagaimana ada chert tetapi kontak dengan batubara?

di Buku Barber, itu dipublikasikan ada Cekungan Tuhur dan Cekungan Kualu... Bagaimana stratigrafinya dan tektonik historinya?


Terimakasih


Salam,
PTS
Prihatin Tri S
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Re: Pre-Tertary Basin di Sumatra

Postoleh Aveliansyah » Sen Mar 30, 2015 6:50 pm

wow menarik betul.. ada photo nya gak gan?
bedded chert kah?
Aveliansyah
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Re: Pre-Tertary Basin di Sumatra

Postoleh Prihatin Tri S » Sel Mar 31, 2015 10:45 am

atau mungkin bukan chert ya... ya semacam batupasir silika...

kalau ditoba banyak sih kita jumpai endapan pasir diatom, ataubahkan diatome aja...

ada juga batubara muda terbentuk..

bagus juga nih kita sayat sampelnya, analisis pelontologi chert nya dan di analsis geokimia sampelnya batubara.. :matabelo:
20150319_163612.jpg
20150319_163612.jpg (1.64 MiB) Dilihat 7589 kali
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Re: Pre-Tertary Basin di Sumatra

Postoleh syahreza angkasa » Rab Apr 01, 2015 3:28 pm

red bed sandstone mungkin brur.. lebih seru lagi kan ceritanya... :cool:
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Re: Pre-Tertary Basin di Sumatra

Postoleh Prihatin Tri S » Rab Apr 01, 2015 3:54 pm

:jempol2: hehehehe semakin banyak kemungkinan yha?

tapi red sandstone itu nama formasi atau nama batuan berdasarkan deskripsinya yha?

ada sih dating nya chertnya/batupasir silikaan itu dipublikasi katanya middle jurssic..


kalo red sandstone itu gimana ceritanya yha?
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Re: Pre-Tertary Basin di Sumatra

Postoleh syahreza angkasa » Rab Apr 01, 2015 7:37 pm

wah saya bukan sedimentologist euy.. jadi gak begitu ngerti... umurnya middle jurasic? brarti itu protolith batuan dari hilamaya? atau emang ekpos aja? :bingung:
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Re: Pre-Tertary Basin di Sumatra

Postoleh Prihatin Tri S » Kam Apr 02, 2015 11:28 am

:bingung: Kalo Kualu Basin ma Tuhur Basin itu dah masuk ke peta Cekungan Sedimen atau peta Cekungan Migas Indonesia belum yha?
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Re: Pre-Tertary Basin di Sumatra

Postoleh Prihatin Tri S » Sen Apr 06, 2015 12:02 pm

ini ada abstrak Andang Bachtiar dkk (2014) ttg penelitian batuan pre-Tersier di Sumatra:


THE PRE-TERTIARY PETROLEUM SYSTEM IN NORTH SUMATRA BASIN: AN INTEGRATED STUDY FROM ONSHORE NORTH SUMATRA OUTCROPS AND SUBSURFACE DATA FROM OFFSHORE WEST GLAGAH KAMBUNA

Andang Bachtiar*, Jaafar B Unir**, Amin Bunyamin**, Hendra Iriansyah Darmawan**, Fithra Harris Darmawan**, Frederick Herbert Korah**, Bobby Mazmur Sihole**, Lismawati***, Prihatin Tri Setyobudi****


ABSTRACT

The offshore area of North Sumatra Basin is believed to have good hydrocarbon accumulation potential and is considered challenging for hydrocarbon exploration. Several exploratory wells had been drilled in this area with major discoveries mainly in Tertiary age reservoirs such as the Baong and Belumai Formations. The Pre-Tertiary plays of the North Sumatra Basin are still underexplored and are believed to have an important role in future successful hydrocarbon exploration in the area.

The Pre-Tertiary play is the main exploration target in West Glagah Kambuna in offshore North Sumatra Basin. Previous regional studies suggested that the basements in this area are mainly the Tampur Formation of Eocene - Early Oligocene age. Based on present study however, the basement of the West Glagah Kambuna area mainly consists of the Batumilmil, Kaloi and Kualu Formations of Permian - Triassic age that are parts of the Peusangan Group.

The offshore seismic data clearly indicate angular unconformity contact between the Pre-Tertiary and the Tertiary stratigraphy. In addition to the clearly defined Tertiary sedimentary-fills section, the seismic also shows good images of the Pre-Tertiary packages which can be differentiated based on their internal-external reflection characteristics and reflectivity. By correlating the pre-rift seismic section with onshore geology which is based on outcrop data, it is interpreted that the Pre-Rift stratigraphy found in offshore area belongs to Mesozoic Peusangan Group. The Peusangan Group in the offshore area can be divided into three different formations; from the oldest to the youngest are the Batumilmil, Kaloi, and the Kualu Formations. The Batumilmil Formation is represented by chaotic seismic character; the Kaloi Formation is represented by high amplitude seismic reflection, while the low amplitude seismic reflection above the Kaloi Formation is interpreted as the Kualu Formation. The good match between seismic and well data in WGK block and surrounding area strongly support the interpretation.

The outcrop study in Aceh and North Sumatra Province has confirmed that the pre-Bampo/Bruksah section of the North Sumatera Basin comprising not only the Dolomite Tampur Formation, but also several formations from Meureudu and Peusangan Groups which are Pre-Tertiary in ages. The study also suggested that the pre-rift dolomitic carbonate are not just belong to the Tampur Formation since the Peusangan Group also shown similar lithology, particularly in Batumilmil and Kaloi Formations. The extensive tectonic and subaerial exposure has promoted fractures and caving in those formations. Beside the dolomitic carbonate, the study also found clastic rock within the Pre-Tertiary stratigraphy. The clastic rocks are black shale in Batumimil and mudstone in Kualu Formation. Several fossils could still be found in Batumilmil carbonate and Kualu mudstone. The outcrop sedimentology characteristic are still showing sedimentary rock character where bedding and layering is clear and common.

The Pre-Tertiary formations that developed in WGK block and surrounding area are parts of the Peusangan Group, which based on our field observation and laboratory analysis of Kaloi, Kualu, and Batumilmil Formation, they show good reservoir properties and also with high carbon content in their shales in some places. It shows a possibility of the Pre-Tertiary formations to have its own petroleum system, separated from the Tertiary formations. This promotes new exploration opportunity in southern part of North Sumatera Basin, particularly in WGK block.

dipublikasikan di IPA Annual Convention and Exhibition - 2014
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