Use of fault-seal analysis in understanding petroleum migration in a complexly faulted anticlinal trap, Columbus Basin, offshore Trinidad

Gibson, Richard G.; Bentham, Peter A.

doi:10.1306/08010201132

Cited by 31 publications

(18 citation statements)

References 24 publications

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“…Gibson & Bentham 2003) and potentially useful fault property correlations (Huntoon 1986;Knott 1994). For estimating the probability of 'sealing', it would be useful to discover what proportion of pumping tests show barrier-boundary responses.…”

Section: Anti Fracturesmentioning

confidence: 99%

Towards prediction of saturated-zone pollutant movement in groundwaters in fractured permeable-matrix aquifers: the case of the UK Permo-Triassic sandstones

Tellam

Barker

2006

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Abstract:The UK on-shore Permo-Triassic sandstones are fluvial and aeolian red beds showing a nested cyclic architecture on scales from millimetres to 100s of metres. They are typical of many continental sandstone sequences throughout the world. Groundwater flows through both matrix and fractures, with natural flow rates generally of less than 200 m year -1. At less than 30 m horizontal distances, below important minimum representative volumes for both matrix and fracture network permeability, breakthroughs are likely to be multimodal, especially close to wells, with proportionately large apparent dispersivities. 'Antifractures' -discontinuities with permeability much less than that of the host rockmay have a dominating effect. Where present, low-permeability matrix (e.g. mudstones) will significantly affect vertical flow, but will rarely prevent eventual breakthrough. Quantitative prediction of breakthrough is associated with large uncertainty. At scales of 30 to a few 100s of metres, multimodal breakthroughs from a single source become less common, although very rapid fracture flow has been recorded. At distances of hundreds of metres to a few kilometres, there is evidence that breakthroughs are unimodal, and may be more immediately amenable to quantitative prediction, even in some cases for reacting solutes. At this and greater scales, regional fault structures (both slip surfaces and granulation seams) can have major effects on sub-horizontal solute movement, and mudstones and cemented units will discourage vertical penetration. The aquifer has limited oxidizing capacity despite the almost ubiquitous presence of oxides, limited reductive capacity and limited organic sorption capacity. It has a moderate cation-exchange capacity, and frequently contains carbonate. Mn oxides are important for sorption and oxidation, but are present in limited quantity. Relationships between hydraulic and chemical properties are largely unknown. 'Hard' evidence for the solute transport conceptual model presented above is relatively limited. To be able to predict to a reasonably estimated degree of uncertainty requires knowledge of: the geological, and thence the hydraulic and geo-chemical, structure of the complex sandstone architecture (including the correlations between these properties); the development of suitable investigation techniques (especially geophysical) for mapping the structures; and the development of modelling tools incorporating matrix, fractures, 'antimatrix' and antifracture elements, each with associated hydraulic and possibly geochemical properties. In common with solute movement studies in most aquifer types, much more geological characterization needs to be undertaken. Although new investigation and modelling tools are being developed specifically for (shallow) hydrogeological applications with some considerable success, much greater advantage could be taken of importing techniques from other disciplines, and in particular from oil exploration and development.

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Section: Anti Fracturesmentioning

confidence: 99%

Towards prediction of saturated-zone pollutant movement in groundwaters in fractured permeable-matrix aquifers: the case of the UK Permo-Triassic sandstones

Tellam

Barker

2006

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“…Another method, for example, in the case study of fault seal analysis performed on Colombus basin by Gibson and Bentham, the analysis of reservoir connectivity by faults can be simply done by the SGR analysis [13]. The SGR analysis provides an only probability of sealing or interconnectivity across the fault planes [14].…”

Section: Fault Seal Analysismentioning

confidence: 99%

“…By integrating these three approaches, we may improve the level of confidence with respect to the previous methods [12,13,15].…”

Section: Fault Seal Analysismentioning

confidence: 99%

Reservoir Compartment Assessment: A Case Study of Bangko and Bekasap Formation, Central Sumatra Basin Indonesia

Haris¹,

Anindya

Indra³

et al. 2018

GEOMATE

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ABSTRACT:The reservoir compartment assessment for a case study of the Agur field, Central Sumatra Basin has been successfully carried out by using fault seal analysis (FSA). The objective of this paper is to asses subsurface fault properties in term of the fault sealing that was defining the hydrocarbon reservoir compartment. In this work, the FSA was performed by integrating juxtaposition, shale gouge ratio (SGR) and transmissibility analysis over fault plane that was identified within reservoir layers on the Bangko and Bekasap formation. The juxtaposition seal is intended to assess how the reservoir layer is juxtaposed across the fault plane over either reservoir or non-reservoir layer. The SGR analysis is applied to estimate the shale content in the fault plane, which is caused by the fault movement of sequence stratigraphy. The last analysis of transmissibility is carried out to calculate the capacity of a reservoir to drain the hydrocarbon through a fault plane. Faults architecture (throw, heave, and orientation) and the reservoir layer target were identified based on 3D seismic and well log data interpretation. The FSA is applied to nine faults that formed nine reservoir compartments within three reservoir layers, which are obtained from 3D seismic and well log interpretation. The fault characteristics were classified and the fault seal distribution map was produced to identify the reservoir connectivity among the faults. The FSA results show that nine identified compartments in the first reservoir layer are clustered into five compartments. In addition, the FSA clustered nine identified compartments in the second reservoir layer into four compartments. In contrast, nine compartments in the third reservoir layer were connected each other that are clustered into one compartment. These results are useful not only for evaluating future hydrocarbon traps but also for future field development.

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“…2. Previously proposed petroleum migration models for the Columbus basin: (a) fault migration into Teak field to explain lateral segregation of oil and gas (after Leonard, 1983); (b) tortuous vertical migration out of overpressured section into Samaan field (based on Heppard et al, 1990Heppard et al, , 1998; (c) combined lateral and vertical migration into Mahogany field controlled by geometry of shelf sand terminations (after Gibson & Bentham, 2003). Arrows indicate petroleum flow pathways; dark gray in (b) and (c) is overpressured section; light gray in (c) shows extent of shelf sands.…”

Section: Previous Petroleum Migration Modelsmentioning

confidence: 99%

“…Most recently, Gibson and Bentham (2003) developed a migration model based on a study of fault seals in Mahogany field (Fig. 1a) that emphasizes the role of lateral migration within sheet-like, shelf sand horizons (Fig.…”

Section: Previous Petroleum Migration Modelsmentioning

confidence: 99%

Shelf petroleum system of the Columbus basin, offshore Trinidad, West Indies. II. Field geochemistry and petroleum migration model

Gibson¹,

Dzou²

2004

Marine and Petroleum Geology

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Use of fault-seal analysis in understanding petroleum migration in a complexly faulted anticlinal trap, Columbus Basin, offshore Trinidad

Cited by 31 publications

References 24 publications

Towards prediction of saturated-zone pollutant movement in groundwaters in fractured permeable-matrix aquifers: the case of the UK Permo-Triassic sandstones

Towards prediction of saturated-zone pollutant movement in groundwaters in fractured permeable-matrix aquifers: the case of the UK Permo-Triassic sandstones

Reservoir Compartment Assessment: A Case Study of Bangko and Bekasap Formation, Central Sumatra Basin Indonesia

Shelf petroleum system of the Columbus basin, offshore Trinidad, West Indies. II. Field geochemistry and petroleum migration model

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