Petroleum Exploration: A Quantitative Introduction

Sengbush, R. L.

doi:10.1007/978-94-009-4554-8

Cited by 1 publication

(1 citation statement)

References 15 publications

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“…Presence of gas in the formation decreases the unit's velocity and density relative to the surrounding lithological units. This decrease produces a high-impedance contrast at the boundary where impedance changes resulting in a high-reflectivity zone or bright spot [3]. In addition, S-transform which transfers data from time domain to frequency domain provides us with frequency information.…”

Section: Introductionmentioning

confidence: 99%

Application of S-Transform and Simultaneous Seismic Inversion to Interpret Bright Spots

Moosavi¹,

Mokhtari²

2016

J Pet Environ Biotechnol

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Bright spots are usually seen in seismic sections that can be interpreted as gas reservoirs. These local anomalies are identified as an increase in amplitudes on a seismic section. However, bright spots are not always gas indicators. They are also produced because of lithology changes. In this case, to prevent great costs of drilling, we need to understand the cause of bright spots. In this paper we use two methods which are mainly based on frequency and velocity analysis of seismic waves. Therefore, we apply simultaneous seismic inversion and S-transform on a 2D pre-stack seismic data which in its CDP gathers, several bright spots are seen. We just choose two of these bright spots arbitrarily. If they are due to hydrocarbon, P-wave velocity decreases sharply while S-wave velocity increases slightly, therefore decreases. Similarly, high frequencies being eliminated in the hydrocarbon areas. In contrast, if the bright spot is produced due to lithology change (gas saturated limestone/ limestone interface) then frequency and P-wave velocity will increase while S-velocity decreases.

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Section: Introductionmentioning

confidence: 99%