麻豆直播 Geology Webinar Uncovers the Cause of Overpressure Occurrence in Sedimentary Basin.
By Adi Permana
Editor Adi Permana
BANDUNG, itb.ac.id 鈥 Webinar series from Geological Engineering 麻豆直播 under the title of 鈥溌槎怪辈 Geology Greets: Solidarity for Nation鈥 returning with the 14th webinar edition theming 鈥淥verpressure in Sedimentary Basins: The Indonesia鈥檚 School of Thoughts鈥. This time, the speaker is Agus M. Ramdhan, Ph.D., who is a lecturer from Applied Geology Research Group on Saturday (6/3/2021).
Webinar begins with defining overpressure. Agus showed participants several real illustrations of overpressure such as Champion Field Blowout (1979), Piper Alpha (1988), Lumpur Sidoarjo (2006), and BP Deepwater Horizon Disaster (2010). Agus then conclude that overpressure is a hydro-geology phenomenon when water is rising more than ground level. The rising water could reach 4 to 5 km height.
Overpressure caused by one of these two things, which are loading overpressure or fluid expansion. Loading overpressure happen when pressure on the surface constantly increasing but the sediment layer fails to settle causing the water unable to escape naturally and lead to leakage. It is also often referred to as 鈥淭he Gulf of Mexico (GoM) School of Thought鈥. Meanwhile, fluid expansion or 鈥淭he North-Sea School of Thought鈥 is a condition when fluid increase suddenly on the sediment or decreasing effective stress value.
Agus mention about will there be 鈥淭he Indonesia鈥檚 School of Thought鈥 considering that Indonesia has a long record of drilling the most daring wells in the world since 1970s up until now. This idea brought him to do a further research on overpressure in Durham University in 2007.
He picked Lower Kutai Basin (LKB) in Indonesia as his main research object. 鈥淎long with this, I bring what could possibly be the most precious data in the world regarding overpressure鈥, he said.
He explained the reason behind his statement is, apart from LKB has a very ideal condition, he state that the main cause of LKB overpressure is not loading as it has been believed, but fluid expansion. This obviously provoked a lot of criticism and discussion from different parties. After doing reinterpretation on his journal, it is concluded that LKB has both loading and fluid expansion factors, with ratio of fluid expansion is more dominant proven by formula with physics approach which he made.
Watch this webinar on:
https://www.youtube.com/watch?v=JYP1fUcSjVQ
Reporter: Nabilla Putri M (SAPPK, 2020)
Translator: Aghisna Syifa Rahmani (TPB-SITHS 2020)
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