Reservoir Monitoring of SAGD using Repeated Dual-Well 3D VSP Measurements. A Case Study after 10 months of Production

Tøndel, Richard; Dümmong, Stefan; Nutt, L.; Rufino, R.; Campbell, A.

doi:10.3997/2214-4609.20142570

Cited by 2 publications

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“…Many efforts in data acquisition and processing have been done to improve current 3D VSP imaging techniques, such as dual‐well 3D VSP acquisition (Tøndel et al . ), Distributed Acoustic Sensing (DAS) acquisitions (e.g., Mestayer et al . ; Madsen et al .…”

Section: Introductionmentioning

confidence: 99%

“…Many efforts in data acquisition and processing have been done to improve current 3D VSP imaging techniques, such as dual-well 3D VSP acquisition (Tøndel et al 2013), Distributed Acoustic Sensing (DAS) acquisitions (e.g., Mestayer et al 2011;Madsen et al 2013;Mateeva et al 2013), efficient wave-field separation method (Palacios, Planchart and Jiao 2013), amplitude scaling for migration (Lou et al 2013) and migrating 3D VSP data in the offset and angle domains (Hu 2013). In this study, we will focus on a fundamental problem related to the seismic velocity model used for 3D seismic and 3D VSP imaging.…”

Section: Introductionmentioning

confidence: 99%

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Borehole seismic quantitative diagnosis of a seismic velocity model for 3D seismic imaging of subsurface structures

Hewett

2014

Geophysical Prospecting

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Quantifying uncertainties of surface seismic velocity models is a difficult task. The use of multifarious vertical seismic profiling data provides quantification of velocity model uncertainties. Two borehole seismic diagnosis methods for velocity model uncertainties are developed. The first method is performed with 3D ray‐traced first arrival times through a surface seismic velocity model and compared with measured first arrival times from downhole receivers. It generates a profile of absolute and relative misfits, indicating the velocity uncertainty as a function of depth. The second approach directly compares the differences between the first arrival incident angles measured from 3‐C borehole seismic data and the calculated first arrival incident angles of seismic rays through the velocity model to quantify the model uncertainties. Five seismic velocity models in the Gulf of Mexico are diagnosed using the diagnosis methods with up to six sets of borehole seismic data recorded in three wells. The uncertainty profiles vary with depths and azimuths, revealing the complexity of velocity model uncertainties and providing some clues for further velocity updating. The diagnosis methods are used as velocity updating QC tools and integrated with the conventional seismic velocity updating flow to complement the criteria of flat common image gathers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Borehole seismic quantitative diagnosis of a seismic velocity model for 3D seismic imaging of subsurface structures

Hewett

2014

Geophysical Prospecting

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Borehole Seismic: Essential Contributions Over the Oilfield Lifecycle

Kumar

Bettinelli

2021

Day 3 Tue, November 30, 2021

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During the evolution of the petroleum industry, surface seismic imaging has played a critical role in reservoir characterization. In the early days, borehole seismic (BHS) was developed to complement surface seismic. However, in the last few decades, a wide range of BHS surveys has been introduced to cater to new and unique objectives over the oilfield lifecycle. In the exploration phase, vertical seismic profiling (VSP) provides critical time-depth information to bridge time indexed subsurface images to log/reservoir properties in depth. This information can be obtained using several methods like conventional wireline checkshot or zero-offset vertical seismic profiling (ZVSP), seismic while drilling (SWD) or distributed acoustic sensing (DAS) techniques. SWD is a relatively new technique to record real-time data using tool deployed in the bottomhole assembly without disturbing the drilling. It helps to improve decision making for safer drilling especially in new areas in a cost-effective manner. Recently, a breakthrough technology, distributed acoustic sensing (DAS), has been introduced, where data are recorded using a fiber-optic cable with lots of saving. ZVSP also provides several parameters like, attenuation coefficient (Q), multiples prediction, impedance, reflectivity etc., which helps with characterizing the subsurface and seismic reprocessing. In the appraisal phase, BHS applications vary from velocity model update, anisotropy estimation, well- tie to imaging VSPs. The three-component VSP data is best suited for imaging and amplitude variation with offset (AVO) due to several factors like less noise interference due to quiet downhole environment, higher frequency bandwidth, proximity to the reflector, etc. Different type of VSP surveys (offset, walkaway, walkaround etc.) were designed to fulfill objectives like imaging, AVO, Q, anisotropy, and fracture mapping. In the development phase, high-resolution images (3D VSP, walkaway, or crosswell) from BHS surveys can assist with optimizing the drilling of new wells and, hence reduce costs. it can help with landing point selection, horizontal section placement, and refining interpretation for reserve calculation. BHS offers a wide range of surveys to assist the oilfield lifecycle during the production phase. Microseismic monitoring is an industry-known service to optimize hydraulic fracturing and is the only technique that captures the induced seismicity generated by hydraulic fracturing and estimate the fracture geometry (height, width, and azimuth) and in real time. During enhanced oil recovery (EOR) projects, BHS can be useful to optimize the hydrocarbon drainage strategies by mapping the fluid movement (CO2, water, steam) using time-lapse surveys like walkaway, 3D VSP and/or crosswell. DAS has brought a new dimension to provide vital information on injection or production evaluation, leak detection, flow behind tubing, crossflow diagnosis, and cement evaluation during production phase. This paper highlights the usage of BHS over the lifecycle of the oilfield.

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Reservoir Monitoring of SAGD using Repeated Dual-Well 3D VSP Measurements. A Case Study after 10 months of Production

Cited by 2 publications

References 0 publications

Borehole seismic quantitative diagnosis of a seismic velocity model for 3D seismic imaging of subsurface structures

Borehole seismic quantitative diagnosis of a seismic velocity model for 3D seismic imaging of subsurface structures

Borehole Seismic: Essential Contributions Over the Oilfield Lifecycle

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