Downhole seismic and S-Waves Jacques JENNY Geo 2X Genève.

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Presentation transcript:

Downhole seismic and S-Waves Jacques JENNY Geo 2X Genève

Principles A triaxial geophone is moved down into a borehole connected with a seismograph Regularly, the geophones are jammed into the hole On the ground surface, P and S wave are generated usually with a sledge hammer hiting a beam

Principles P waves are done hitting vertically an aluminium plate on the ground To create S waves we can strike a piece of wood firmly blocked (below cars tire for example) Principles

Processing data using Win_Downhole 1.Conversion to SU format 2.Depth and type (P,S1,S2) input for all traces 3.Extraction of P, S1, S2 traces 4.Addition of S1 + S2 after polarity inversion 5.FBP picking on P and S traces 6.Velocity / Depth diagram 7.Modulus computation

Geometry input

P waves FB picking

S waves FB picking

Time depth curve

Young Poisson Modulus Modulus

Formula

S-wave refraction Seismic refraction (and reflection) using S waves is possible with few adaptations: Horizontal geophones Energy with S component (Sledge hammer hiting laterally a beam, leaning buffalo gun shots. Two lateral shots added after polarity inversion to enhance S waves

Surface waves The multichannel analysis of surface waves (MASW) method was first introduced into geotechnical and geophysical community in early MASW is a seismic method which generates a shearwave velocity (Vs) profile (i.e., Vs versus depth) by analyzing Rayleigh-type surface waves on a multichannel record. The method utilizes multichannel recording. MASW utilizes energy commonly considered noise on conventional reflection seismic surveys.

Data acquisition MASV requires receivers Digital seismograph Low frequency geophones (4.5 Hz) Software

Final profile: Depth /Velocity

FIN END