Seismic Interpretation: The Physical Aspects

Anstey, N. A.; Kusmana,; Listanto, Edy; Ambarwati, Alberta DInar

doi:10.1007/978-94-015-3924-1

Cited by 59 publications

(22 citation statements)

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“…The following simple depositional model is used (Anstey 1977), for fine-grained sediments. Products of land erosion are brought down to the sea by rivers and are deposited.…”

Section: Analogies To Athy's Lawmentioning

confidence: 99%

Shale compaction and statistical physics

Korvin¹

1984

Geophysical Journal International

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investigations t o date have furnished strong evidence that the behavior under pressure of the purer types of argillaceous sediments, clays and shales sensu stricto, is different from that of other sediments and while variable in detail is also in a general way uniform. The importance and universality of the phenomenon o f compaction in these rocks are believed t o justify considerable effort to obtain as accurate an idea of the general quantitative relations between pressure and volume as the nature of the problem will permit. H. D. Hedberg ( 1 936)Summary. After a short historical outline of the development of the ideas on the compaction of clays and shales it is shown that the exponential porositydepth dependence of compacted shales expressed by Athy's law can be derived using standard methods o f statistical physics. The main result of the paper states that the exponential compaction law expresses the maximumentropy equilibrium state of the pores in the rock, that is compaction is an irreversible process where clay particles tend towards a statistically defined final equilibrium. Connections with the classical theory of consolidation are pointed out. Historical and problem discussionAthy's law, expressing the density (or porosity) decrease as a function of depth of thick pure shale columns is one of the most unanimously accepted and widely used empirical expressions in applied geophysics. With Athy's (1 930a) original notations, the compaction law states that:where D is the density t o be calculated, B is the density of surface clay, A is the maximum density increase possible, b is a constant, x is depth of burial. In recent usage, the compaction law is generally quoted as: P(Z> = P O + (P--P O ) [1 -exp (-kz)l

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“…The following simple depositional model is used (Anstey 1977), for fine-grained sediments. Products of land erosion are brought down to the sea by rivers and are deposited.…”

Section: Analogies To Athy's Lawmentioning

confidence: 99%

Shale compaction and statistical physics

Korvin¹

1984

Geophysical Journal International

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“…The three elastic modulus which concern us are young modules (E), bulk modulus (k) and rigidity modulus (µ). For P-wave, the appropriate value of E is K + 4/3 µ or λ + 2µ, while for S-wave the appropriate value of E is µ [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Reservoir Fluids Identification Using Vp/Vs Ratio?

Hamada

2004

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Identification de fluides de réservoir par le rapport V p /V s -Le temps de propagation des ondes sismiques de compression est largement utilisé pour la détermination de la porosité. En se servant à la fois des ondes sismiques transversales et des ondes de compression, il est possible de discriminer les propriétés mécaniques des roches. L'utilisation du rapport de vitesses des ondes sismiques de compression et transversales, V p /V s , permet de définir une méthode pour identifier la nature des fluides saturant les pores de la roche. Le rapport V p /V s varie selon le fluide (eau, huile et gaz) présent dans les pores de la roche. Des exemples tirés des études de champs montrent comment la représentation du rapport V p /V s sous forme graphique permet d'identifier la nature des fluides saturant les roches de réservoir. Abstract

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“…This Oxfordian faulting was reactivated later along NW-SE strike-slip faults during Late Cretaceous (in Alves et al (2002)) and along NE-SW to NNE-SSW transpressive faults in the Miocene . Wrench zones often originate chaotic or no reflection areas (Anstey et al, 1992) and here, this type of faulting is partially responsible for the chaotic and discontinuous seismic pattern shown by the seismic profiles that is associated to the Castanheira member, as already recognised by Leinfelder and Wilson (1989). The opening between the Montalegre and Ota horsts (Fig.…”

Section: Middle Oxfordian-berriasianmentioning

confidence: 95%