Seismik s.r.o. - Passive Seismic Services

Seismik s.r.o. - Passive Seismic Services

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        Seismik s.r.o.

        A privately held company established in 2010 in Prague, Czech Republic.  Providing seismic services for the oil and gas industry with an orientation on passive seismic.

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        05 October 2020
        Company quality policy

        Management of Seismik s.r.o. accepts the commitment to continuously build a stable company, which thanks to
        its technological solutions and proactive search and implementation of innovative changes will become a
        sought-after and valued business partner, able to provide services at a high quality level and flexibly respond to
        the requirements of its clients from various geographical regions and fields of our activity. We want to build a
        strong company known for its expertise and client-oriented approach, which will be perceived in this way by its
        Surroundings.

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  • Discrimination between natural and induced seismicity

Discrimination between natural and induced seismicity

Correlation of injection and seismicity.
Correlation of injection and seismicity.

An ability of differentiation of natural and induced seismicity is rather difficult but extremely important.

Seismic events observed in the vicinity of oil and gas operations can be induced, triggered, or natural. The currently used criteria, for distinguishing the natural and triggered seismicity, developed in the last century, are based on a subjective comparison of injection activities and seismic rates. For example, a direct cross-correlation of an earthquake and injection rates is intrinsically positive-valued because both, injection and earthquake rates, are positive. We objectively measure a potential connection between the earthquake and the injection rates by a modified correlation approach. Applied to multiple case studies of clear-cut cases of induced seismicity, our method gives high cross-correlation values dominated by a positive maximum delayed typically by 12-24 hours. This delay corresponds to the seismicity following the injection. On the other hand, our method exhibits no correlation for natural seismicity cases or for a randomly simulated seismicity and injection. In such cases the result of this method provides correlation values close to zero or oscillates between positive and negative values, typically between +0.5 and -0.5.

 

REFERENCES

  • Opršal I., Eisner L. (2014), Cross-correlation—an objective tool to indicate induced seismicity, Geophysical Journal International, January 2014, 196(3), pp: 1536-1543 
Seismik s.r.o. - Passive Seismic Services

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