66th EAGE Conference & Exhibition

P226 PERMEABILITY ESTIMATES OF THE GEOTHERMAL RESERVOIR SOULTZ-2000 USING INDUCED SEISMICITY N. DELÉPINE 1 2 N. CUENOT 2 E. ROTHERT 1 M. PAROTIDIS 1 and S.A. SHAPIRO 1 1 Freie Universitaet Berlin Department of Geophysics Malteserstr. 74-100 D-12249 Berlin Germany 2 Institut de Physique du Globe Strasbourg France Summary At the geothermal site of Soultz (France) a hydraulic stimulation was carried out in July of 2000. During the experiment microseismic events were monitored and located. Here we analyse the spatio-temporal distribution of these events to estimate the large-scale permeability of the medium. We assume that the main triggering mechanism is

P228 PASSIVE IMAGING OF SEISMIC DEFORMATION ASSOCIATED WITH INJECTION FOR ENHANCED RECOVERY Abstract 1 Passive seismic imaging of reservoir deformation is potentially a powerful technique to monitor a number of reservoir operations including injections for enhanced recovery. In this paper we describe two case studies and compare the seismic deformation associated with gas injection in a East Texas field and steam injection in a Western Canada field. The comparison shows that more seismic deformation occurs in the East Texas field compared to the steam injection or that reported in the literature for two compacting North Sea reservoirs which bodes well

P232 DELINEATING SALT CAVERNS USING BOREHOLE SEISMIC MODELING AND TOMOGRAPHY METHODS Abstract 1 Borehole seismic modeling and Finite Difference synthetic approaches were used to study the feasibility of using borehole seismic salt proximity techniques to determine the extent of buried salt caverns. Two borehole seismic methods refraction salt proximity and cross-well travel time tomography were used to determine the shape of an underground salt cavern as well as to delineate the salt-sediment boundary. Tomographic inversion of synthetic traveltime data generated from two borehole seismic survey geometries was performed to reconstruct an image of a salt cavern and the salt-sediment boundary.

P234 VIRTUAL SOURCES A NEW WAY TO REMOVE OVERBURDEN PROBLEMS. Summary By shooting on the surface with geophones placed in the subsurface under troublesome overburden we can simulate a survey that has very advantageous “Virtual Sources” at the buried geophone locations and is easy to image. This is a way to achieve reproducible data over targets spoiled by heterogeneous scattering and possibly changing overburden. The method allows us to use the full spatial bandwidth of the overburden scattered source energy and achieve near perfect deconvolution for overburden transmission effects. 1 The method has applications for enhanced reservoir characterization and production

07/01.04 – EAGE2g P236 THE DOV DOWNHOLE ORBITAL VIBRATOR: IMPLICATIONS FOR THE NEW GEOPHYSICS 1 STUART CRAMPIN 1 * SEBASTIEN CHASTIN 1 PETER C LEARY 2 and LARRY WALTER 2 1 School of GeoSciences University of Edinburgh Edinburgh EH9 3JW 2 Geospace Engineering Resources International Houston TX 77477 * also at Edinburgh Anisotropy Project British Geological Survey Edinburgh EH9 3LA [email protected]; [email protected]; [email protected]; [email protected] Abstract The stability and repeatability of the DOV downhole orbital vibrator provides sufficient source resolution to measure crosshole travel-times to ~0.02ms. Theory and observations show that using the DOV as source this accuracy is sufficient to

P238 ON-TUBING SEISMIC SENSOR IN FLOWING WELLS: CONTRIBUTION TO NOISE ANALYSIS Introduction 1 J-P. DEFLANDRE 1 C. MAISONS 2 T. BOVIER-LAPIERRE 3 P. MEYNIER 1 J. CZERNICHOW 3 1 INSTITUT FRANÇAIS DU PETROLE 1 & 4 avenue de Bois Préau 92852 Rueil-Malmaison France In some areas opportunities for deploying down-hole sensors to perform microseismic surveys can be limited to flowing wells. In this paper we will review some noise sources which affect the ability of on-tubing geophones deployed in flowing wells to monitor reservoir seismicity. The experience of IFP and his partners is based on more than 10 years of

P242 Introduction K. KWOLEK 1 T. SOLARSKI 1 and A. BUNIAK 1 1 Polish Oil and Gas Company Department of Exploration Regional Office „North” Pila Staszic Square 9 64-920 Pila Poland Several gas fields in Rotliegendes sandstones have been discovered within the area of Fore-Sudetic Monocline. Most of the fields have been formed in typical structural traps where the reservoir rocks belong to eolian sandstones composing the uppermost part of Rotliegendes deposits. Among some of the few exceptions there are lithologic and structural traps of Paproc-Cicha Gora and Ujazd fields in the western part of the Poznan Trough (fig.1). These

P244 RECONNAISSANCE GEOELECTRIC INVESTIGATIONS FOR OIL WITHIN EXPLORATORY BLOCK R-9 IN WESTERN KAZAKHSTAN 1 S.P. LEVASHOV 1 A.I. SAMSONOV 1 N.A. YAKYMCHUK 1 I.N. KORCHAGIN 2 K.M. TASKYNBAEV 3 1 Institute of applied problems of Ecology Geophysics and Geochemistry Laboratory lane 1 Kyiv 01133 Ukraine e-mail: [email protected] [email protected] 2 Institute of Geophysics of Ukraine National Academy of Science e-mail: [email protected] 3 OAS “Embamunaygaz” Atyrau Kazakhstan Abstract. Some results of the investigations within exploratory block R-9 with using the technology of direct searching for hydrocarbon deposits by geoelectric methods are given. The executed studies demonstrate high efficiency of this technology allowing

P246 REGIONAL DISTRIBUTION OF THE EOCENE CARBONATE RESERVOIRS OF THE METLAOUI GROUP (C137 & NC41 OFFSHORE LIBYA) Objective and method The objective of the poster is to illustrate the main parameters which control both the regional and local distribution of Eocene carbonate reservoirs located in offshore Libya. These reservoirs include the nummulite limestone of the El Gueria Formation and the dolomite of the Chouabine Formation. The method has resulted in a geological model constrained by the integration of merged 3D seismic well and core data from C137 and NC41 areas respectively operated by Total and ENI. Regional framework The regional

P248 LOWER CRETACEOUS RESERVOIR SEQUENCE DEPOSIT DISTRIBUTION IN CENTRAL TUNISIA 1 H. AZAIEZ* M. BEDIR* M.H. INOUBLI** *I.N.R.S.T. Borj Cedria - B.P. 95 - 2050 Hammam Lif - Tunisia. **F.S.T. - Campus universitaire - 1060 Le Belvedère - Tunisia. Abstract The Central Atlas of Tunisia is characterized by NE-SW NW-SE and N-S faults directions. These faults border tectonic blocks and allow Triassic halokinetic movements. Lower Cretaceous series that crop out in the region represent platform deposits. Reflection seismic sections and well analysis with sequence seismic stratigraphy allowed the subsurface recognition of these sequence deposit distribution. Seismic mapping of these sequences