3D VSP imaging under a complex salt finger at Atlantis,  Gulf of Mexico

Lee, Chang‐Chun; Yang, Jing; Chrisman, Robert; Gestel, Jean‐Paul van; Benson, Mark

doi:10.1190/segam2018-2996268.1

Cited by 3 publications

References 4 publications

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Development of a subsea distributed acoustic sensing acquisition system

van Gestel,

Soulas,

Naldrett

2024

GEOPHYSICS

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Over the last decade Distributed Acoustic Sensing (DAS) data acquisition has seen great improvements from better interrogators, engineered fiber and lessons learned from subsea installation and acquisition. This has given us confidence that DAS cables can be installed in wells with subsea trees to be used as receivers for Vertical Seismic Profile (VSP) seismic imaging. VSP imaging for deepwater fields has shown to provide better illumination and higher frequency seismic data. Permanent DAS cable installation can be used to acquire highly repeatable time lapse (4D) data. DAS cables were installed in a number of subsea wells on two deepwater oil fields with the intention to cover the crest of these fields with high frequency seismic data. A system was developed to allow for DAS acquisition on these offshore, subsea wells with long distance tie backs using permanently installed interrogators on the floating platforms and engineered fiber in the wells. On each of these fields a DAS cable has now been installed and a subsequently a zero offset (ZO) DAS VSP was acquired for verification and commissioning. These ZO DAS VSP acquisitions showed high fidelity installations resulting in DAS VSP data with excellent data quality. These first subsea DAS acquisitions show great promise and further installations and acquisitions are planned with the ultimate goal of providing high frequency seismic images over the crest of these fields to reduce the uncertainty in decisions around reservoir management and future infill drilling.

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Development of a subsea distributed acoustic sensing acquisition system

van Gestel,

Soulas,

Naldrett

2024

GEOPHYSICS

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Deep learning joint inversion of seismic and electromagnetic data for salt reconstruction

Sun

Denel

Daril

et al. 2020

SEG Technical Program Expanded Abstracts 2020

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Imaging improvements from subsalt 3D VSP acquisitions in the Gulf of Mexico

et al. 2019

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From 2015 through 2018, BP acquired six large-scale 3D vertical seismic profile (VSP) data sets at their Gulf of Mexico assets, two at each of the Thunder Horse, Mad Dog, and Atlantis fields. The acquisition of these large-scale data sets was enabled by the development of a 100-level wireline tool and the adoption of simultaneous shooting. With those two developments, it became feasible to acquire data sets with the coverage and data density needed to build high-quality images of the subsurface using 3D VSP acquisitions. There have been recent advances in finite difference modeling to guide the survey design and the high-quality processing that is required to create the 3D VSP image volumes. These volumes have two main advantages over conventional surface seismic data. First, in 3D VSP acquisition, the receiver can be located below the overlying salt bodies, which allows for illumination of the reservoirs that cannot be achieved using surface seismic data. Second, the location of the receivers closer to the imaging targets enables higher frequency content of the resulting VSP data compared to conventional surface seismic images. Both imaging enhancements can have a significant business value, and the resulting VSP data sets have demonstrated a clear impact on business decisions. In the three case studies, we demonstrate the business impact of the 3D VSP data acquired through improvement of imaging of stratigraphic edges, improved interpretation of fault geometry and orientation, and related improvement of the quality of well planning and targeting. We conclude with discussion on cost, global impact, and present recommendations and lessons learned for future surveys.

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3D VSP imaging under a complex salt finger at Atlantis, Gulf of Mexico

Cited by 3 publications

References 4 publications

Development of a subsea distributed acoustic sensing acquisition system

Development of a subsea distributed acoustic sensing acquisition system

Deep learning joint inversion of seismic and electromagnetic data for salt reconstruction

Imaging improvements from subsalt 3D VSP acquisitions in the Gulf of Mexico

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