Geopressure Centroid as Pore Pressure Prediction Challenge in Deepwater South East Asia

Kaeng, Geovani Christopher; Sausan, Sarah; Satria, Andrean

doi:10.2523/18239-ms

Cited by 4 publications

(3 citation statements)

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“…The lateral transfer of fluid overpressure, defined by Yardley and Swarbrick (2000) as the internal redistribution of fluid pressure in a confined and tilted reservoir, can produce elevated crestal pore pressures and occurs via the centroid effect (Bowers, 2001; Dickinson, 1953; Traugott, 1997). This phenomenon can cause challenges in pore pressure prediction, especially in complex environments such as fold and thrust belts (Flemings & Lupa, 2004; Kaeng et al, 2014). The McKee Field in the Tarata Thrust Zone is comprised of several adjoining fault blocks that produce oil, gas and condensate from a steep south‐easterly dipping (up to 60°) sandstone reservoir sequence truncated against a deep thrust (Figure 9) (King & Thrasher, 1996).…”

Section: Discussionmentioning

confidence: 99%

Tectonostratigraphic controls on pore fluid pressure distribution across the Taranaki Basin, New Zealand

2023

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Pore fluid pressure distribution within a sedimentary basin is controlled by a combination of factors, including stratigraphic stacking, lithofacies distribution, fault zone permeability, sedimentation rate, diagenesis, petroleum generation and structural evolution. Basins with an initial rift phase coupled with high sedimentation rates often display pore fluid pressures above hydrostatic, but subsequent structural shortening can drastically alter the initial distribution of pore fluid pressure. Pore fluid pressure in excess of the hydrostatic gradient (overpressure) has been shown in several sedimentary basins to increase basinward (e.g. Javanshir et al., 2015;Tingay et al., 2005;Van Balen & Cloetingh, 1994;Zoccarato et al., 2018) due to a gradual reduction in sand-to-mudrock ratio (net-to-gross),

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Section: Discussionmentioning

confidence: 99%

Tectonostratigraphic controls on pore fluid pressure distribution across the Taranaki Basin, New Zealand

2023

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“…Unfortunately, in some cases, this assumption fails (Swarbrick 2001) and is much more pertinent in deepwater contractional areas, such as in DSCM (Kaeng et al 2014). Figs.…”

Section: Pp Predictionmentioning

confidence: 99%

“…Despite a bright future in deepwater plays, drilling into the prospects have been challenging, particularly in NW Borneo (Kirchner 2005;Kaeng et al 2014), where subsurface hazards related to PP and wellbore stability remain the greatest obstacle. A myriad of wellbore issues have led to failure of some wells reaching geological targets and the drilling cost as high as USD 100 million (as of 2014) is not uncommon.…”

Section: Introductionmentioning

confidence: 99%

Geopressure Prediction in Deepwater Southeast Asia: Case Study from Sundaland Borneo Continental Margin

Osundina

Simatupang

Kaeng

et al. 2015

SPE/IATMI Asia Pacific Oil &Amp; Gas Conference and Exhibition

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Drilling into deepwater prospects of South East Asia have been very challenging especially in NW Borneo and subsurface hazards related to pore pressure and wellbore stability remain the greatest obstacle. A myriad of wellbore issues have led to failure of some wells to reach geological targets and the drilling cost as high as US$100 million (as of 2014) is not uncommon in the area. It is important to be able to understand the geological nature of pore pressure mechanism in deepwater Sundaland continental margin (DSCM) and thus redefine pore pressure prediction strategy in the area to better align with the regional characteristics.The currently established empirical effective stress-based pore pressure prediction is dissected to reveal its pitfalls especially regarding its application to DSCM. Compaction mechanism assumptions are also revisited in depth. Three wells from a deepwater field in Northwest Borneo are used as a case study to demonstrate the distinct overpressure nature of the area.This study confirms that DSCM not only exhibits overpressure profile typical to deepwater anywhere else, but also possesses distinct geopressure characteristics related to its unique geological setting, most notably the active compressional shortening of the mega thrust-fold belts accompanied by continuous rapid deltaic sediment deposition. As a result, unique geopressure-related challenges prevail in this area, such as: shallow top of overpressure, the failure of standard empirical compaction methods, and prominent centroid phenomenon.It is successfully demonstrated that the shallow top of overpressure of DSCM is linked to rapid sedimentation of low permeability sediments; undrained tectonic shearing is the central cause of common underestimation of popular effective-stress based pore pressure prediction method; and that the dominance of compressional geological structures explains the high likelihood of centroid effect.

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Fast Track Well Planning in Borneo

Pathy

Kumar

Kaeng

et al. 2016

SPE Asia Pacific Oil &Amp; Gas Conference and Exhibition

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This paper highlights the phenomenal achievement of a Malaysian operator's first fast track drilling operation in a deepwater well offshore Borneo. The collaborative well planning (CWP) method fundamental to the drilling success is discussed. The discussed drilling environment is an overpressured deepwater area that has not only forced the earlier A1 and A2 to early total depth (TD) and caused abandonment of geological targets, but also contributes to numerous operational problems. Despite the challenges, operations on A3 ST-1 required significantly less operational time cost than budgeted. The difference between the previous two wells and A3 ST-1 was that, during the planning period, multidisciplinary concerns were addressed more carefully in real-time by employing CWP to unite geoscientists, drilling engineers, and other stakeholders using 3D integrated platform technology. This CWP helped the operator meet objectives for A3 ST-1, a fast track well that required only two months of drilling time, rather than the typical 12 to 18 months. It resulted in one primary well location and six geological sidetrack scenarios being accomplished in only one day. Upon the end of the operation, Well A3 was drilled with one successful cased hole sidetrack to geological target objectives without significant operational problems. A significant portion of the success can be attributed to the proper accommodation of concerns and best practices of rig usage, engineering insights, tool usage, and geological conditions during the planning process through the common software platform that can seamlessly allow collaboration of both geoscience and engineering data. The process automation only requires key drilling parameters to construct well trajectories, which was also significant in terms of shortening the planning time. This paper describes the first application of the CWP concept in offshore Borneo, which has become a trendsetter in terms of efficient and safe deepwater drilling planning and operations.

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Geopressure Centroid as Pore Pressure Prediction Challenge in Deepwater South East Asia

Cited by 4 publications

References 0 publications

Tectonostratigraphic controls on pore fluid pressure distribution across the Taranaki Basin, New Zealand

Tectonostratigraphic controls on pore fluid pressure distribution across the Taranaki Basin, New Zealand

Geopressure Prediction in Deepwater Southeast Asia: Case Study from Sundaland Borneo Continental Margin

Fast Track Well Planning in Borneo

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