Imaging and Mapping of Hydrocarbon Traps in Areas of Complex Salt Tectonics in Ukraine - Case Studies

Tiapkina, O. M.; Sydorenko, G.; Parkhomenko, Tatiana V.

doi:10.3997/2214-4609.20147885

Cited by 3 publications

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“…at z = 2.865 km, high-amplitude features are visible close to the diapir flanks, in which a noticeable faulted structure is present. Such image features are potentially associated with hydrocarbon prospects (Harding and Lowell, 1979;Tiapkina et al, 2008).…”

Section: Field-data Examplementioning

confidence: 99%

True-amplitude migration through regularized extended linearized waveform inversion

2021

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The ability to create subsurface images whose amplitudes are proportional to the elastic wavefield variations recorded within seismic data as a function of reflection angle is fundamental for performing accurate amplitude-versus-offset (AVO) analysis and inversion. A process that generates such images is commonly referred to as true-amplitude migration. We demonstrate how the extended subsurface-offset image space is able to preserve the elastic behavior of the primary reflections when these events are acoustically migrated with a reverse-time-migration (RTM) approach performed in a least-squares fashion. Using a single-interface model, we show how the angle-domain image amplitude variations from an extended-offset acoustically migrated image closely follow the theoretical elastic Zoeppritz response even at the critical angle. Furthermore, we present a subsalt synthetic test in which single-component ocean-bottom-node (OBN) data are employed within a regularized linearized waveform inversion procedure. In this test, we highlight the ability of the acoustic extended-angle image domain to preserve the correct elastic amplitude variations of the reflected events from three subsalt sand lenses. The proposed method allows the accurate inversion of elastic-wave data for subsurface parameter variations that are critical for reservoir characterization in oil and gas exploration and production. We demonstrate its performance on an ocean-bottom-node (OBN) field dataset recorded in the Gulf of Mexico in which the AVO response of a potential gas-bearing prospect is correctly retrieved.

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Section: Field-data Examplementioning

confidence: 99%

True-amplitude migration through regularized extended linearized waveform inversion

2021

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“…For instance, in the depth section extracted at z = 2.865 km a noticeable faulted structure is present (Figure 35c). Such image features are potentially associated with hydrocarbon prospects (Harding and Lowell, 1979;Tiapkina et al, 2008).…”

Section: Initial Rtm Images and Geological Scenario Descriptionmentioning

confidence: 99%

Target-oriented elastic full-waveform inversion through extended-migration redatuming

Biondi

Barnier

2018

SEG Technical Program Expanded Abstracts 2018

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Target-oriented elastic full-waveform inversion through acoustic extended image-space redatuming

et al. 2023

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Elastic full-waveform inversion (FWI) can provide accurate and high-resolution subsurface parameters. However, its high computational cost prevents the application of this method to large-scale field-data scenarios. To mitigate this limitation, we propose a target-oriented elastic FWI methodology based on a redatuming step that relies upon an extended least-squared migration process. In our approach, the surface-reflection data can be attributed to a given subsurface portion when mapped into the image space. This process allows us to reconstruct reflection data generated by a target area and recorded with a virtual acquisition geometry positioned directly above it. The redatuming step enables the application of an elastic FWI method within the target portion only. The entire workflow drastically decreases the overall cost of the surface-data inversion and allows the retrieval of accurate elastic parameters of the area of interest. We demonstrate the effectiveness of our approach on a synthetic case based on the well-known Marmousi2 model and on a 3D ocean-bottom-node (OBN) pressure data recorded in the Gulf of Mexico in which we retrieve the elastic parameters of a potential prospect, positioned in proximity of a salt-dome flank, and whose rock-physical properties are consistent with the presence of a gas-bearing sand reservoir.

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Imaging and Mapping of Hydrocarbon Traps in Areas of Complex Salt Tectonics in Ukraine - Case Studies

Cited by 3 publications

References 0 publications

True-amplitude migration through regularized extended linearized waveform inversion

True-amplitude migration through regularized extended linearized waveform inversion

Target-oriented elastic full-waveform inversion through extended-migration redatuming

Target-oriented elastic full-waveform inversion through acoustic extended image-space redatuming

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