We present a case study with regard to multiple contamination of seismic data in post-stack 3D seismic data in the North Kuwait Gotnia subbasin, which holds very good hydrocarbon potential within Pre-Cretaceous reservoirs but faces considerable challenge in reservoir characterization because of its multiple contamination. This study attempted to focus mainly on the Pre-Cretaceous carbonate reservoir around the KM structure. The main challenge is to deal with interference of 5th or 6th order peg-leg multiples with primary signals at the reservoir level. Peg-leg multiples are instances of short-path, multiple reflected seismic energy that can directly impact the seismic inversion results, facies mapping, structural interpretation, and hence depth prediction. The improved approach to multiple attenuation could be demonstrated by a pilot processing using the following techniques on select locations. The new technique delineates a spatial an area which may be contaminated with multiples in post-stack 3D seismic data. First step tool for interpreter.Key elements gained from this method to implement multiple mitigation measures, which can reduce the multiple-contamination effect in post-stack data are: ∘Identifying spatial area of contamination by observation by horizon flattening.∘Nature of amplitude contamination over structurally favourable locations.The interference may indicate the nature of multiple contamination. This method is subject to testing. A new approach to identifying and interpreting multiple contaminated primaries in full-stack seismic data provided a better interpretation of data for the North Kuwait Gotnia sub-basin. It revealed need for more multiple modeling and vertical seismic profiling (VSP) in all wells. However, it also provides a methodology for reprocessing for all available 3D seismic data through multiple mitigation that can improve seismic inversion, reinterpretation, geomodeling on newly processed 3D seismic data
We present an exploratory case study of the oil and gas field located onshore within the Gotnia sub-basin located in northwestern Kuwait (Fig-1). Main objectives of this study include: to delineate the Kra Al-Maru and Riksah structure, to establish fault network, to assess fractured reservoir in its entirety, to achieve optimal depth conversion, to identify and assess critical inputs for fracture modeling and to provide key inputs for geo-modeling, all which lead to describing the location.Structurally, the area is characterized by four main fault systems. Most of them have subtle seismic signatures on vertical sections as observed on poststack 3D seismic data. The dominant trends in the region are oriented NS and NNE-SSW where the unique. Kra Al-Maru structure is oriented NW-SE, which delimits the main structural high; however, dominant structural trends observed in sets of wells show NS, NNE-SSW trends. The second fracture set observed in the wells is oriented NE-SW, marked by minor vertical throws. The third and fourth fracture sets are oriented WNW-ESE, NW-SE characterized by no fault throws. Observations from core studies also support results achieved in this study.Riksah structure is a well-defined four-way-closure anticline and appears to be a reasonable areal entrapment of about 33 km 2 . Its prospectivity is dictated by fracture potential of the reservoir. It is separated by a saddle like feature from Kra Al-Maru structure located to the west of this culmination.
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