Full 3D relocation of microseisms for reservoir monitoring

Vesnaver, Aldo; Lovisa, L.; Böhm, Gualtiero

doi:10.1190/1.3059185

Cited by 8 publications

(6 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The shrinking grid method is not computationally expensive. In terms of hypocenter relocation errors, its precision is comparable to the approach of Lomax et al (2000), as discussed by Vesnaver et al (2008). As any iterative method, the search could be trapped into local minima, especially for complex 3D media and sparse receivers.…”

Section: A P P E N D I X a : W A D A T I ' S M E T H O D A N D I T S mentioning

confidence: 79%

See 1 more Smart Citation

Joint 3D processing of active and passive seismic data

Vesnaver

Lovisa

Böhm

2010

Geophysical Prospecting

Self Cite

View full text Add to dashboard Cite

A B S T R A C TPassive seismic provides additional illumination sources in producing reservoirs, improving the Earth's imaging obtained by standard 3D seismic surveys. The joint tomographic inversion of surface and borehole data, both active and passive, even allows the delineation of thin reservoirs that cannot be resolved by reflection tomography. As an application example, we present a feasibility study for a real case of CO 2 geological storage, showing that this operation may benefit both environment and reservoir monitoring.The origin time of micro-earthquakes due to production operations is critical for merging active and passive data. We show here that the Wadati's method is not accurate for borehole data in a layered earth model, when the ratio between P and S velocities is not constant, as occurs in most hydrocarbon reservoirs. This drawback can be solved by deploying a few receivers at the surface close to the well.

show abstract

Section: A P P E N D I X a : W A D A T I ' S M E T H O D A N D I T S mentioning

confidence: 79%

“…2001b, among others) but it is still in a pioneering phase when involving both active and passive seismic data (Battaglia et al . 2008; Vesnaver, Lovisa and Böhm 2008). Here we present an application integrating active and passive data, acquired both at the surface and in wells.…”

Section: Introductionmentioning

confidence: 99%

Joint 3D processing of active and passive seismic data

Vesnaver

Lovisa

Böhm

2010

Geophysical Prospecting

Self Cite

View full text Add to dashboard Cite

show abstract

“…Our inversion algorithm adopts the "shrinking grids" method (Vesnaver et al 2008(Vesnaver et al , 2010, whose accuracy is comparable to the method of Lomax et al (2000). For all following tests, the dimension of the shrinking grids are 5x5x9 in the x,y,z directions, respectively, with an initial search range of 500x500x300 m and 25 iterations.…”

Section: Estimation Of Relocation Accuracymentioning

confidence: 99%

3D Relocation Errors of Microseismic Events by Surface and Borehole Receivers for Shale Gas Stimulation

Alsahfy¹,

Vesnaver²,

Jervis³

et al. 2014

Proceedings

View full text Add to dashboard Cite

SUMMARYMicroseismic monitoring and mapping of induced hydraulic fractures (frac) is an important tool in unconventional oil and gas exploitation. It is a key technology for completion evaluation which allows for continuous improved frac design, frac effectiveness, and ultimate resources recovery estimation and development. Formation evaluation tools provide accurate measurements of the target formation's petrophysical and mechanical properties proximal to the borehole only, distal to the borehole though, Microseismic monitoring can be a useful tool to monitor the formation's response to the frac. Shale response to hydraulic stimulation can be estimated mainly by the local density and pattern of hypocentres. Linear trends of microseismic event and their associated focal mechanisms may highlight the reactivation of faults due to hydraulic stimulation, while the location of events outside the target formation may suggest a need for future Improvements to the completion/ stimulation plan, and in some cases, restimulation. However, errors in the hypocentre locations may convert clear trends into "fuzzy" clouds, hampering our understanding of how the simulation interacted with the formation. The accuracy of hypocentral coordinates of micro-earthquakes is critical for understanding and proper planning for the hydraulic stimulation jobs of a shale play.

show abstract

“…In this way, we can measure the relocation error as a function of the adopted velocity model and the algorithm parameters. Another goal was to compare the accuracy between the classical Hypo71 code, used by the OGS for cursory preliminary analysis, and the recent Hypo3D code, which was developed for reservoir monitoring of hydrocarbon production [Vesnaver et al 2008[Vesnaver et al , 2009[Vesnaver et al , 2010. The Hypo3D code can jointly invert the traveltimes from active and passive seismic surveys, with receivers located both at the Earth surface and in boreholes, using direct, reflected, refracted and converted waves.…”

Section: Introductionmentioning

confidence: 99%

Full three-dimensional relocation and tomographic inversion of the 1977-2008 earthquakes in north-eastern Italy: a feasibility study

Vesnaver

Urpi²

2013

Annals of Geophysics

View full text Add to dashboard Cite

<p>In a regional seismological network, the estimation of the epicenter is usually robust, especially for events inside or close to the network boundaries. In contrast, the hypocentral depth is very sensitive to the assumed velocity field. In this study, we compare the hypocenter estimates obtained by a classical algorithm in a simple one-dimensional (1D) model with a recently developed full 3D model that is based on shrinking grids. This study is preliminary, as the 3D Earth model is based on limited data from the literature; however, it demonstrates that different patterns show up when a more representative geological model is adopted. This encourages further studies, based on fully integrated 3D models from active surface seismic, well data and other geophysical measurements. Such an integrated approach has been successfully adopted by the oil and gas industries for decades, which has increased the exploration success rate and the production of hydrocarbon reservoirs.</p>

show abstract

Full 3D relocation of microseisms for reservoir monitoring

Cited by 8 publications

References 5 publications

Joint 3D processing of active and passive seismic data

Joint 3D processing of active and passive seismic data

3D Relocation Errors of Microseismic Events by Surface and Borehole Receivers for Shale Gas Stimulation

Full three-dimensional relocation and tomographic inversion of the 1977-2008 earthquakes in north-eastern Italy: a feasibility study

Contact Info

Product

Resources

About