Affiliation:
1. Department of Geology & Department of Groundwater Engineering, Institut Teknologi Bandung, Bandung, West Java, Indonesia
2. Global GeoPressure Advice, UK
Abstract
Many basins in Indonesia such as the North Sumatra, South Sumatra and Lower Kutai are highly overpressured. As a result, some wells have experienced drilling problems resulting in termination. In the literature, an empirical relationship such as Eaton has historically often been used to interpret pore pressure. In this paper, we take an alternative approach, one based on deterministic models.
Herein, we use Bowers’ and Dutta's equations to calculate the contributions of loading and unloading to the overall overpressure. Due to the advantages of the density log, the contributions of loading and unloading can be discriminated. By applying these methods, we suggest that in the North Sumatra Basin, unloading is caused by clay diagenesis. In the others, gas generation is significant.
The analysis also reveals that the unloading parameter (
U
) in the North Sumatra and South Sumatra basins is different than that of
U
in the Lower Kutai Basin. This suggests that mudrock in the overpressure zone in the Sumatran basins is more elastic than that in the Lower Kutai Basin, which appears to be more plastic in behaviour.
Thematic collection:
This article is part of the Geopressure collection available at:
https://www.lyellcollection.org/cc/geopressure
Publisher
Geological Society of London
Subject
Earth and Planetary Sciences (miscellaneous),Economic Geology,Geochemistry and Petrology,Geology,Fuel Technology
Reference51 articles.
1. Alberty M.W. and McLean M.R. 2003. Emerging trends in pressure prediction. Offshore Technology Conference Houston Texas OTC-15290-MS https://doi.org/10.4043/15290-MS
2. Geological Society, London, Memoirs;Barber A.J.,2005
3. Bates J.A. 1996. Overpressuring in the Kutai Basin: distribution origins and implications for the petroleum system. Indonesian Petroleum Association 25th Annual Convention Jakarta Indonesia.
4. Bois M. Grosjean Y. and de Pazzis L. 1994. Shale compaction and abnormal pressure evaluation application to the offshore Mahakam. Indonesian Petroleum Association 23rd Annual Convention Jakarta Indonesia.
5. Pore Pressure Estimation From Velocity Data: Accounting for Overpressure Mechanisms Besides Undercompaction
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献