Awang , Vicky
Setelah mengikuti diskusi Anda anda , saya bertambah yakin betapa pentingnya kita mengikuti Sandi Startigrafi . Sehingga tidak akan pabaliut antara Kikim Tuff , Lahat , Lemat , Talang Akar . Formasi Vulkanik Jatibarang dst.. Mungkin Awang dalam posisi yang tepat untuk meng"arah"kan para operator ini. Si Abah > Pako Rovicky, > > Data yvang berhubungan dengan masalahLemat-grite wash dari sumur >penelitian itu saya publikasi secara terbatas pada pertemuan Sumatra > Stratigraphy Workshop (SSW) di Duri pada September 2005. Presentasi2 dalam > pertemuan ini kemudian dimintakan makalah lengkapnya dan dibukukan di > bawah komando Pak Yarmanto (Chevron) dan dilepas ke publik pada PIT IAGI > yang lalu (2008) di Bandung -ini adalah tradisi workshop stratigrafi, > seperti juga workshop stratigrafi Jawa sebelumnya. Sayang, saya tak sempat > membuat makalah lengkapnya untuk publikasi SSW -meskipun telah ditagih > beberapa kali oleh Pak Yarmanto - maaf Pak Yarmanto, di buku itu saya > hanya memberikan abstraknya dan di ex Panitia Workshop ada bahan > presentasinya. > > Sumur tersebut sampai sekarang masih berada di blok aktif. Datanya (raw > data & interpretation) bila sudah terbuka kalau mengikuti aturan data > terbuka sejak data diperoleh, bisa diakses. Hanya untuk mendapatkannya > mesti menghubungi Operator terkait (karena blok aktif) secara business to > business di bawah fasilitasi dan pengawasan BPMIGAS. > > Di bawah ada abstrak makalah tersebut. > > Salam, > awang > > INDONESIAN ASSOCIATION OF GEOLOGISTS – RIAU CHAPTER > SUMATRA STRATIGRAPHY WORKSHOP > DURI, RIAU 12 – 13 SEPTEMBER 2005 > > “GRANITE WASH” OF LEMAT FORMATION OR IN-SITU GRANITE OF BASEMENT ? : THE > PROBLEM OF SOUTH SUMATRA STRATIGRAPHY AND NEW APPROACHES FOR ITS SOLUTION > > Awang Harun Satyana > > (BPMIGAS - Badan Pelaksana Kegiatan Usaha Hulu Minyak dan Gas Bumi) > > Basement of the South Sumatra Basin is a complex of Mesozoic igneous rocks > and of Paleozoic and Mesozoic metamorphics and carbonates intruded by > Mesozoic igneous rocks. Structural relationships of rocks composing of the > basement are complex as can be seen at outcrops in the Barisan Mountains. > This complexity extends into the subcrops of the South Sumatra Basin. > > In some places, strata of Late Cretaceous to Early Eocene are also grouped > as the basement. This has caused a problem of identifying the basement. > The problem is more complicated when the strata composed of “granite > wash” – a unit of re-deposited granite in the lower part Lemat Formation > (Early Eocene-mid Oligocene) overlie the basement which also composed of > in-situ granite. > > ”Granite wash” can be difficult to distinguish from in-situ granite, even > in outcrop, let alone down hole. Additional complication by alteration may > obscure original fabric of the rock. Several approaches have been used to > determine whether or not the upper parts of several granite plutons have > been eroded and re-deposited as “granite wash”. The approaches include : > petrography of granite, absolute dating of granite and its veins, and > paleomagnetics of granite. > > Petrographic analysis can reveal sedimentary origin of “granite wash” like > the presence of fine grained matrix material or showing hydrothermal > origin of in-situ granite. Absolute dating of veins is done to constraint > the age of fabric present at the time of veining. If the rock is > considered to be re-deposited, the re-deposition would have to be older > than the vein formation. The vein age would provide a minimum age for > granite/”granite wash” fabric. As for paleomagnetics, it is hypothesized > that in-situ granite should give a relatively strong uni-directional > signal of paleomagnetics whereas granite broken into constituent sand > grains and then randomly rearranged in a sedimentary rock is less likely > to give a uni-directional signal. > > Some wells in South Sumatra Basin penetrated either “granite wash” of > Lemat Formation or in-situ granite of the Basement, and/or both of them. > Identification of top Basement is problematic when it is not known > precisely which granite constitutes the lithology. This study shows how > the above approaches were applied to solve the problem. > > --- On Tue, 1/20/09, Rovicky Dwi Putrohari <rovi...@gmail.com> wrote: > > From: Rovicky Dwi Putrohari <rovi...@gmail.com> > Subject: Re: [iagi-net-l] Re: [Forum-HAGI] [iagi-net-l] Talangakar dan > Lemat > To: iagi-net@iagi.or.id > Date: Tuesday, January 20, 2009, 1:13 PM > > On Tue, Jan 20, 2009 at 1:55 PM, Awang Satyana <awangsaty...@yahoo.com> > wrote: >> >> Saya punya data sebuah sumur yang menembus baik Talang >> Akar-Lemat-granite > wash-dan insitu granite (fresh granite) Basement - dan dengan jelas bisa > didefinisikan batas-batas batuan itu, kebetulan sumur ini adalah sumur > penelitian untuk memahami masalah granite wash dan endapan pre-TAF, > sehingga > punya analisis yang lengkap baik petrografinya, umur absolutnya, bahkan > geomagnetismenya. >> >> salam, >> awang > > Pak Awang, > Apakah ada public data (publikasi) sehubungan dengan sumur > "penelitian" diatas ? > Sangat menarik tentunya. Bisa menjadi kunci untuk membuka pintu2 > gudang minyak di sumatra selatan. > > RDP > "masih mimpi open file data policy" > > -------------------------------------------------------------------------------- > serah-terima pp-iagi: senin sore, 13 oktober 2008 > ketua umum: LAMBOK HUTASOIT > sekjen: MOHAMMAD SYAIFUL > pasukan sedang disusun, hanya satu IAGI... > -------------------------------------------------------------------------------- > ayo, segera pula siapkan utk PIT IAGI ke-38 > dg tuan-rumah adalah PENGDA JATENG > * mungkin di semarang > * mungkin pula di solo > * mungkin juga join dg HAGI dll. > ----------------------------------------------------------------------------- > To unsubscribe, send email to: iagi-net-unsubscribe[at]iagi.or.id > To subscribe, send email to: iagi-net-subscribe[at]iagi.or.id > Visit IAGI Website: http://iagi.or.id > Pembayaran iuran anggota ditujukan ke: > Bank Mandiri Cab. 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In no event shall > IAGI and > its members be liable for any, including but not limited to direct or > indirect > damages, or damages of any kind whatsoever, resulting from loss of use, > data or > profits, arising out of or in connection with the use of any information > posted > on IAGI mailing list. > --------------------------------------------------------------------- > > > > > -- _______________________________________________ Nganyerikeun hate batur hirupna mo bisa campur, ngangeunahkeun hate jalma hirupna pada ngupama , Elmu tungtut dunya siar Ibadah kudu lakonan.
