Geophysical data acquisition - OGS

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Measurements while drilling (R & D) Coordinator: Flavio POLETTO C. BELLEZZA P. CORUBOLO A. CRAGLIETTO M. LOVO M. MALUSA L. PETRONIO G. PINNA U. TINIVELLA S. TINONIN The research was primarily aimed at studying in deep and extending the applicability of the seismic while drilling technology as well as increasing the industrial potential by raising the number of geological information given by the method. The projects developed by the SERE group in collaboration with ENI/AGIP are the following: A) Acquisition of a 3D reverse VSP using the drill-bit source during the drilling of an ENI/AGIP well in Sicily (Italy). Such a method, which is the only capable of acquiring an onshore 3D VSP on a large number of acquisition levels, was applied in cooperation with the “while drilling” data acquisition group (ASTI). The experiment, funded with the contribution of the 3D-RVSP European Union programme (Contract Thermie OG 278/98 IT/UK, partners OGS, ENI/AGIP and Prosol Technology), allowed us to acquire a good quality 3D Seisbit dataset. The receivers were placed on a 15 square Km area and the investigation was carried out on a 3 km long well section. We used radial and circular seismic lines in a geometry suited to discriminate the signal and noise arrivals (first Figure). During the survey setup we computed some 3D elastic models and after the acquisition phase data have been processed as multioffset vsp sections along the cross shaped radial seismic lines. We are still processing the circular lines with the aim of obtainig a 3D reverse vsp imaging. B) Theoretical analysis and experimental study of signals measured in the drill pipes and of reflection coefficients at the drill-bit / rock interface. This allowed us to measure the acoustic impedance of the drilled formations and to gather information about the signal amplitude in relation to changes in the drillstring and drilled rock (formation evaluation while drilling). C) Feasibility study for the Geosteering project (ENI/AGIP). This project is aimed at steering the drilling operations basing on “while drilling” information. Particularly, the research is aimed at the tuning of a method and an acoustic system to be used downhole for monitoring the lithology in the vicinity of the drill bit for the purposes of drillers and geopysicysts. The feasibility study includes the use of downhole instruments and the syncronization with surface measurements. Field and laboratory tests have been carried out with the prototype instrument called Instrumented Sub ENI/AGIP. Such measurements allowed us to detect the drill bit signal also in highly unfavorable conditions, even for the surface measurements (second Figure). Numerical modelling methods were developed to analyze the signals propagation throughout the drill string. Moreover, the research was extended 23
to study methods suited to predict overpressure zones using SWD and to the analysis of electromagnetic signals in a well. D) Feasibility study and preparation of the technology for the extension of the method to the deep sea and downhole environments, in collaboration with ENI/AGIP and Tecnomare. E) In deep study and analysis of datasets collected during a SWD experiment carried out in a tunnel. Study of the applicative contexts, of the tunnel boring machine signal resolution and of the signal and noise components. F) Study and multioffset processing of a dataset acquired in a geothermal area along seismic lines laid out in a multiradial geometry with respect to the well head (in collaboration with ENEL). Analysis and preparation of a dataset for tomographic inversion, in collaboration with REDS. 24
Page 2 and 3: Istituto Nazionale di Oceanografia
Page 4: Contents Introduction . . . . . . .
Page 7 and 8: Sea, close to the Antarctic Peninsu
Page 10 and 11: Measurements while drilling (data a
Page 12 and 13: Vallazza research well: 3D-RVSP sei
Page 14 and 15: Therefore, having beside a high ele
Page 16 and 17: • Standard 20’ container modifi
Page 18 and 19: • Offshore gravimetric survey “
Page 20 and 21: The GPR instruments. Integrated met
Page 22 and 23: Seismic data processing Coordinator
Page 24 and 25: allow for the different spatial sam
Page 26 and 27: Results of application of the stati
Page 30 and 31: Wave modeling Coordinator: Géza SE
Page 32 and 33: Phase velocities of the five wave m
Page 34 and 35: (SPEM) and the Wavenumber Integrati
Page 36 and 37: The Marche Microzonation Project is
Page 38 and 39: Seismic inversion Coordinator: Aldo
Page 40 and 41: The joint inversion of direct, refl
Page 42 and 43: Transferring technology from the oi
Page 44 and 45: At the end of the year, we started
Page 46 and 47: ODP Leg 178 - Site Location Site 10
Page 48 and 49: Core 1165B-14H Composite diagram sh
Page 50 and 51: Cenozoic Evolution of the South Ork
Page 52 and 53: Magallanes-Fagnano master fault TWT
Page 54 and 55: (Top): Structural map of the BSRs o
Page 56 and 57: Physical properties of sediment cor
Page 58 and 59: Bathymetric map of the North Atlant
Page 60 and 61: Synthetic Aperture Radar (SAR) remo
Page 62 and 63: Publications Wave modeling ARNTSEN,
Page 64 and 65: Seismic inversion ROSSI, G., AND VE
Page 66 and 67: TINIVELLA, U. AND LODOLO, E., 2000.
Page 68 and 69: POLETTO, F., LOVO, M., AND CARCIONE
Page 70 and 71: REBESCO, M., CITA, M.B., HIEKE, W.,
Page 72 and 73: Visitors Peter F. BARKER, British A
Page 74 and 75: About Trieste, Italy Overwiew Tries
Page 76 and 77: Near Trieste One cannot miss a visi

Geophysical data acquisition - OGS

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