The effects of structural components on seismic wave velocity in incompetent units, case study: Gachsaran Fm. (SW Iran)

Tamimi, Naser; Fard, Iraj Abdollahie; Sherkati, Shahram

doi:10.1190/1.3255648

Cited by 1 publication

(2 citation statements)

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“…However, low quality seismic image obtained from ZFTB suffers from two: acquisition obstacles and seismic data processing problems (Sepehr and Cosgrove 2004). As Tamimi et al (2009) showed in their study, the main acquisition and data processing problem is poor illumination and accurate estimation of seismic velocity under incompetent units with plastic character (e.g. salt, shale and anhydrate).…”

Section: The Zagros Over-thrustmentioning

confidence: 99%

“…5 The Pazanan area 3D seismic structural interpretation Tamimi et al (2009) stated that the Gachsaran Formation consisting of evaporites (anhydrite and salt) governs velocity of the seismic wave propagation in the media. Barzgar et al (2015) demonestrated that seismic velocity of the Gachsaran Formation is affected by its predominant lithology and will increase by increasing amount of anhydrite.…”

Section: Seismic Imaging In Complex Structuresmentioning

confidence: 99%

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Improvement of seismic structural interpretation of Zagros fold-thrust belt by dip scanning in common diffraction surface imaging method

2016

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Geological interpretation and seismic imaging on data acquired from complex media, especially when accompanied by a thick layer of salt and/or anhydrate, is always a controversial task. The aim of this study is to introduce a method for seismic imaging of complex structures and study the folding scenario of the Zagros overthrust in SW Iran based on the improved seismic image processed by the proposed method. A diffraction based version of the common reflection surface stack method, called the common diffraction surface (CDS), was selected to enhance quality of seismic image from the Zagros fold-thrust belt. The 2D CDS method was also developed here to 3D partial CDS. Consequently, three sets of 2D and a set of 3D seismic data were processed with the conventional Kirchhoff prestack time migration and the partial common diffraction surface methods. Geological models released in previous studies of the Zagros overthrust were used as the base model of interpretation. Structural interpretation on seismic sections with new method was in accordance with previous geological models and improved in some parts where the new method could enhance quality of the seismic image. Seismic structural interpretation shows the inner part of the belt was subjected to folding, uplift and erosion. This mechanism constituted a resistant mass in the Dezful Embayment in front of the SW moving thrust and folds. This resistant mass formed tightly folded or thrusted and highly shortened structures in the Izeh zone and High Zagros area. In the oil rich zone of the Dezful Embayment, the thick evaporate-rich Gachsaran Formation, decouples the folding & Behshad Jodeiri Shokri

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Section: The Zagros Over-thrustmentioning

confidence: 99%

Section: Seismic Imaging In Complex Structuresmentioning

confidence: 99%