Menarik Kuntadi kalau methanogenic bacteria bisa hidup sampai temperature 110 deg C, berarti banyak textbook dan paper geokimia tentang bacterial gas harus direvisi sebab umumnya menaruh 80 deg C sebagai batas maximum hidup bacteria jenis ini. Atau, mungkin spesies bacteria yang lain di luar methanogens yang kita kenal selama ini. Ini bisa positif.
Tetapi, negatifnya, bacteria yang sama berarti bisa tahan juga pada temperature reservoir 110 deg C. Kalau reservoir itu mengandung minyak, maka bisa terjadi biodegradasi. Selama ini kita membatasi bahwa biodegradasi hanya terjadi pada reservoir2 minyak dengan temperature < 80 deg C; bila ternyata bakteri bisa hidup sampai 110 deg C, maka ada kemungkinan bahwa reservoir2 minyak yang lebih dalam yang temperaturnya masih < 110 deg C ada kemungkinan terbiodegradasi juga. Salam, awang -----Original Message----- From: Kuntadi, Nugrahanto [mailto:[EMAIL PROTECTED] Sent: Tuesday, April 10, 2007 8:03 C++ To: iagi-net@iagi.or.id Subject: RE: [iagi-net-l] Biogenic, Re: [iagi-net-l] East Java - Tuban Graben Yang jelas Kepodang dan Terang Sirasun adalah biogenic gas yang rangenya kurang lebih 500bcf each loh, belum lagi seperti Hebras, Mawar, dan Seruni yang di Karimun offshore Central Java, lalu Merpati dan well ex Conoco lainnya di offshore utara Tuban. Kalau dikompilasi semuanya dalam satu paket regulasi kayaknya bisa memberikan kontribusi yang sangat besar bagi pasokan gas Jatim Frank... Studi global BP sekarang menunjukkan bahwa biogenic gas bacteria masih bisa hidup hingga temperatur mencapai 110deg C, bukan 70deg C (+/- 3000-4000ft an) spt yang dipercaya selama ini. Jadi rupanya yang mutan bukan hanya makhluk vertebrata saja Frank, bacteria jg bisa adaptasi menyesuaikan hidupnya yang juga makin susah terdesak oleh manusia juga...he..he..he... Salam, kun -----Original Message----- From: Franciscus B Sinartio [mailto:[EMAIL PROTECTED] Sent: Monday, April 09, 2007 7:34 PM To: iagi-net@iagi.or.id Subject: [iagi-net-l] Biogenic, Re: [iagi-net-l] East Java - Tuban Graben Kun, biogenic kan selalu relatif adanya dikedalam yang relatif dangkal. jadi overburden pressure nya kecil saja. jadi reserve yang bisa di hold kecil saja. punya case history biogenic yang besar dari 500 BCF nngak? fbs nb: Pak Awang terimakasih atas penjelasannya. ----- Original Message ---- From: "Kuntadi, Nugrahanto" <[EMAIL PROTECTED]> To: iagi-net@iagi.or.id Sent: Monday, April 9, 2007 6:12:15 PM Subject: RE: [iagi-net-l] East Java - Tuban Graben Ada Vit, walaupun umumnya berupa oil shows. Selain thermogenic, Tuban graben dipercaya bisa memberi kontribusi thd keterdapatan biogenic gas di sumur Calypso yang dibor BP bbrp tahun lalu di sebelah ujung timur selatan dari Bawean platform - proven tested gas walaupun tinggi kadar CO2 nya tapi biogenic di East Java masih merupakan untaian mutiara nan terpendam loh..., coba deh plis jangan utak atik thermogenic mulu atuh... > ____________________________________________________ > Regional Evaluation Team Tangguh Exploration & Appraisal > bp Phone: +62-21-78548184 > P.O. Box 1063/JKT 10010 Fax: +62-21-78549140 > Jakarta, Indonesia e-mail: [EMAIL PROTECTED] > -----Original Message----- From: Parvita Siregar [mailto:[EMAIL PROTECTED] Sent: Monday, April 09, 2007 3:32 PM To: iagi-net@iagi.or.id Subject: [iagi-net-l] East Java - Tuban Graben Teman2, Kalau Central Deep di East Java sudah proven dengan adanya Poleng dan lapangan2 dari Kodeco, apakah ada sumur2 yang menunjukkan bahwa Tuban Graben di sebelah barat Central Deep merupakan basin yang sudah matang? Apakah ada sumur2 yang membuktikan bahwa Tuban Deep sudah mature? Terimakasih, Parvita H. Siregar Salamander Energy Jakarta-Indonesia Disclaimer: This email (including any attachments to it) is confidential and is sent for the personal attention of the intended recipient only and may contain information that is privileded, confidential or exempt from disclosure. If you have received this email in error, please advise us immediately and delete it. 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