Seismic Attributes Used for Identifying some Structural and Stratigraphic Features on an Onshore 3D Data Set

Lazar, Delia

doi:10.3997/2214-4609.201401390

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“…A seismic attribute is a power tool to aid qualitative and quantitative analysis of seismic data. It allows earth scientists to visualize lithological facies, faults, channels and the depositional environment so as to build up an overall structural picture (Partyka, 2001;Chopra and Marfurt, 2006;Lazar, 2009;Naeem et al, 2015). Out of many dozens of seismic attributes, the Root Mean Square (RMS) amplitude attribute is used in the current study to predict the lateral distribution of sands in the Lower Goru Formation.…”

Section: Introductionmentioning

confidence: 98%

Seismic and well log driven structural and petrophysical analysis of the Lower Goru Formation in the Lower Indus Basin, Pakistan

et al. 2015

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The Sinjhoro concession is prolific gas-producing block situated on the eastern limb of the Lower Indus Basin in Pakistan. It contains several development and production (D & P) leases, which are producing gas from Cretaceous rocks. The present study aimed to evaluate the structural and petrophysical properties of the Lower Goru Formation using a 2D seismic and well-driven integrated study. A seismic driven time structure map of the Lower Goru Formation was generated, which depicted horst and graben structures oriented predominantly in a NNW-SSE direction. These normal faults are deep seated and potentially provide a vertical primary migration pathway to hydrocarbon flow. A prospective lead of 20 ms was identified in the northwestern portion of the structural map, which could be explored further. Besides this, a RMS amplitude map was generated within the target reservoir level to show the general sand body distribution within the reservoir. Our study revealed that the reservoir quality sands are deposited in the eastern portion of the study area. The identified lead is also located on a fair to good level of sand body which is producing from the well drilled to the south of the prospective area. Additionally, it is strongly recommended to conduct an infill seismic survey over and around the newly identified prospect in order to validate its existence and aerial outspreads. Well correlation, petrophysical data logs (PDLs) and cross-plot techniques were adopted to predict the petrophysical properties of the reservoir level. During the petrophysical study, two prospective zone were identified, with Zone-II showing more promising results for hydrocarbon presence than Zone-I. The present research has shown that integration of seismic attributes with petrophysical calculations can help to identify new prospective leads even in cases where there is less seismic data coverage.

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Section: Introductionmentioning

confidence: 98%