66th EAGE Conference & Exhibition

C036 ASSOCIATING DIFFERENT CURVATURES WITH FRACTURE DISTRIBUTION CHARACTERIZATION. Abstract 1 Fracture distribution characterization in anticline structures is often problematic as several fracture orientation sets are generally involved. When the curvature is used in most of the cases only one type is used (mean Gaussian maximum …) giving often partial results on one of the fractures sets only. The aim of this paper is to show a case where the association of two curvatures (directional and Gaussian) helps to characterize the fracture distribution and the relative importance of the different fracture orientation sets. The ratio of the fracture intensity for different

C038 ACOUSTIC EMISSIONS AND VELOCITIES IN ROCKS WITH SETS OF PARALLEL FRACTURES Abstract 1 Seismic methods are increasingly being employed in the field to map the presence and orientation of fracture systems in rock masses. Anisotropy caused by the fractures is reflected in changes in both compressional- (P) and shear-wave (S) velocities depending on their direction of propagation and on the polarization of the shear waves. It is one of the purposes here to study relationships between these velocities and the fluid permeability of rocks containing multiple parallel fractures. Acoustic emissions can also be used to delineate the temporal and

C040 APPLICATION OF FRACTURED RESERVOIR MODELING TECHNOLOGY TO SANDSTONE RESERVOIRS IN SONGLIAO BASIN CHINA Abstract 1 Fracturing is controlled by geological and mechanical properties of reservoir rocks. A case study of fractured sandstone reservoir characterization is used to demonstrate our workflow and fracture modeling technology. The spectral decomposition technology is used to image sandstone reservoirs deposited in channel and delta sedimentary facies. The inverted azimuthal impedance data are used to analyze seismic anisotropy. Fracture orientations can be derived from the analysis of seismic anisotropy guided by seismic forward modeling and strain distribution from geomechanical modeling. Fracture density can be quantified

C042 ILLUMINATING 3D FRACTURED RESERVOIRS BY INTEGRATING 2D VSP AND VERTICAL INCIDENCE DATA ABSTRACT 1 Over the studied area of a fractured carbonate reservoir few faults or fracture zones were interpretable with confidence from the surface seismic data due to the variable quality of these data. From earlier experience [4] it was considered that VSP data may produce information on faulting and/or fracturing that may otherwise be difficult to determine with certainty. It is shown here that VSP including vertical incidence data can contribute to the understanding of the investigated reservoir and enables well-derived information to be extrapolated away from

C044 RESOLVING AMBIGUITY IN FRACTURE INDUCED ANISOTROPY INTERPRETED FROM VARIOUS DATA Summary 1 A comprehensive study of well-log data multi-component VSP data 2D and 3D surface seismic data has been conducted in order to characterize fractures in a clean sand reservoir in the Exmouth Sub-basin offshore North West Shelf Western Australia. Information about fracture density and fracture conductivity is of particular importance for the future injection and production strategy at this site. Careful analysis of high-quality dipolesonic logs showed significant shear wave splitting over the reservoir interval. The shear wave anisotropy was computed to be around 10-15%. This is commonly

C046 LINEARIZED INVERSION OF FRACTURE PARAMETERS FROM PURE AND CONVERTED REFLECTIONS ANDREA GRANDI 1 University of Milan Earth Sciences Department Geophysics Via Cicognara 7 20129 Milan Italy. Summary By means of the Singular Value Decomposition (SVD) I discuss what information is contained in the reflection amplitudes by the fracture parameters. I show that pure and converted waves contain different types of information: reflections perturbations from PP data are mainly related to the perturbations in the fracture density; on the contrary reflections from converted waves are related also to the fracture inclination perturbation. Moreover both for vertical fracturing and for almost-vertical

D002 SEISMIC ATTRIBUTES INVERSION ON FLUVIAL RESERVOIR CHARACTERIZATION GUANGJUN CHEN 1 BAOJIANG WANG 2 1 Schlumberger 100004 Lido place Jichang road Chaoyang District Beijing P.R. China 2 Changqing Petroleum Company PetroChina Xi’an Shanxi P.R. China Abstract: Fluvial reservoirs are some of the most important hydrocarbon carriers and play a very important role in oil and gas exploration. But affected by events of fluvial deposition their structure and distribution are very complicated and also change very rapidly in space. Therefore how to describe fluvial reservoir distribution and examine the oil and gas in them becomes the key in exploration. With some

D004 SEISMIC FACIES INTERPRETATION IN A TURBIDITIC ENVIRONMENT FROM PRE-STACK DATA: A CASE STUDY Summary 1 Seismic facies analysis aims at interpreting a set of features measured locally in reservoirs in terms of qualitative properties. This paper presents a real-case study from a deep-offshore field located in Brazil. The aim of this work is to interpret pre-stack inversion results (P and S-Impedance cubes) obtained by joint pre-stack stratigraphic inversion in terms of seismic facies. This study tackles some issues such as well-to-seismic data integration upscaling of lithofacies and facies definition and identification in a real world. Introduction In the recent

D006 ELASTIC IMPEDANCE INVERSION IN THE WESTERN NILE DELTA A CASE STUDY 1 SUMMARY In 2003 Apache Egypt Companies along with partners RWE Dea and BP Egypt embarked on a largescale pre-stack seismic inversion project in the West Mediterranean concession located in the offshore deep water Nile Delta. To date five successful wells (four new field discoveries and one appraisal) have been drilled in water depths ranging from 2300 to 3500 feet. The commercial objectives are gas bearing sandstones deposited in Pliocene age levee–channel fan complexes draped over structural highs forming combination structural-stratigraphic traps. The goal of this project was

D008 A CASE STUDY OF INVERSION OF LONG OFFSET P-WAVE SEISMIC DATA INTO ELASTIC PARAMETERS 1 R. ROBERTS 1 J. BEDINGFIELD 1 Y. GUILLOUX 2 M. CARR 2 P.MESDAG 3 1 Apache Egypt 11. Street # 281 New Maadi Cairo Egypt P.O Box 672 Maadi 2 Fugro-Jason (UK) Ltd Dukes Court Duke Street Woking GU22 7EP UK 3 Fugro-Jason Plaza Building Weena 598 3000BN Rotterdam The Netherlands Summary In order to understand the distribution of particular formations and fluids in a Pliocene age leveechannel fan complex from Apache Egypt’s West Mediterranean Block 1 Concession a reservoir characterization study was undertaken.