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Collaborating Authors
2003 SEG Annual Meeting
Seismic Reservoir Description of the Barrosa Norte-El Triángulo Field, Argentina, Using Hybrid Seismic Inversion
Sanchez, Emilio (Repsol YPF) | Pianelli, Luis (Repsol YPF) | Saavedra, Carlos (Repsol YPF) | Benabentos, Marcelo (WesternGeco) | Perdomo, Juan (WesternGeco) | Mallick, Subhashis (WesternGeco)
ABSTRACT Barrosa Norte-El Triángulo in the Neuquen province is one of the major gas fields in Argentina with seven producing wells and a total production of 1 million m3 of gas per day. The main productive interval is at a depth between 2000 and 2400 m, and the gas-bearing layers are the fluvial sandstones in the Lotena formation of Jurassic age. The field is characterized by an anticline structure with a major fault in the E-W direction and small normal faults in the N-S direction that form independent blocks with different fluid contacts. The total thickness of the Lotena formation is between 50 and 200 m with a net pay around 25 m. These sands have an average porosity of about 12% and a permeability of about 5 to 10 m Darcy.
- Geology > Structural Geology (0.55)
- Geology > Rock Type (0.36)
Summary Interpretation of several 3D volumes from the Oriente basin suggests that faults define the extent of a given field. Additionally, the subtle stratigraphic boundaries characterised by the clay-filled zones of low porosity compartmentalise oil pools within a field. Identification of these zones is critical. In our experience, neural network based waveform classification has proven to be a successful tool to identify these zones. Qualitative analysis of seismic facies derived from the classification is a common practice. However, we demonstrate in this paper that the quantitative interpretation of seismic facies is possible provided a geological understanding of the seismic signatures is achieved. This paper discusses the extensive 1D-modeling carried out to comprehend the trace shape variations due to changing isopach of the sand/shale sequences, which was fundamental in assigning a realistic geological model to each facies.
- Geology > Geological Subdiscipline (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (0.33)
- Geophysics > Seismic Surveying > Seismic Processing (0.68)
- Geophysics > Seismic Surveying > Seismic Interpretation (0.47)
Seismic Inversion Performed In Synthetic Reference Model
Sancevero, Sérgio Sacani (Dept. of Geology and Natural Resources, State University of Campinas (UNICAMP)) | de Souza Portugal, Rodrigo (Dept. of Geology and Natural Resources, State University of Campinas (UNICAMP)) | Remacre, Armando Zaupa (Dept. of Geology and Natural Resources, State University of Campinas (UNICAMP))
Summary Characteristics frequently present in turbidite reservoirs are the complex distribution of sand bodies and the presence of thin sand layers, which are below the seismic resolution. One way to improve the characterization the reservoir heterogeneities is to perform a series of seismic modeling and inversion studies, concerning seismic amplitudes and impedances. In this work it is discussed the seismic inversion process applied to modeled data generated from a reference model, which possess realistic features of a thin and inhomogeneous reservoir. Since this synthetic reference model is known it is possible to calibrate the seismic inversion parameters, improving its use on real seismic data, which comes from of reservoir with the same characteristics of that synthetic reference model. In this way, the interpretation and conclusions about the inversion results can be made more effectively, since it is possible to study the effects separately.
Pressure Estimation In a Structurally Complex Regime - A Case Study From Macuspana Basin, Mexico
Caudron, Adrien (Paradigm) | Gullco, Roberto (Paradigm) | Oropeza, Simon (Paradigm) | Wang, Joanne (Paradigm) | Castillo, Jorge Mancilla (Petroeos Mexicanos (PEMEX)) | Hernandez, Efrain Mendez (Petroeos Mexicanos (PEMEX)) | Villasenor, Raul Vila (Petroeos Mexicanos (PEMEX))
Summary The Macuspana basin is located at the north of the Motagua-Polochic fault system in the south of Mexico, and is part of a triple junction zone where the North American, Caribbean and the Cocos plates collide (Fig 1). Introduction Studies have been made on the geological settings of Macuspana basin in the past to better understand hydrocarbon traps. The main focus of the project is to estimate pore pressure distribution. Due to the structural complexity of the basin, pore pressure distribution is highly compartmentalized. Some faults assume pressure boundaries. Method Given the objectives of the project, an extended workflow (Fig 2) is designed including Pore Pressure Prediction, Fracture Pressure Prediction, Structure Interpretation, AVO Inversion and Time-to-Depth Conversion.
- North America > Mexico > Tabasco (0.94)
- North America > Mexico > Campeche (0.84)
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Structural Geology > Fault (0.71)
- Geology > Structural Geology > Tectonics > Plate Tectonics (0.35)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock (0.32)
- North America > Mexico > Tabasco > Sureste Basin > Macuspana Basin (0.99)
- North America > Mexico > Campeche > Sureste Basin > Macuspana Basin (0.99)
- North America > Mexico > Veracruz (0.93)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (0.95)
Summary This paper focuses on the depth conversion of regional time maps offshore South-East Brazil, it also outlines the remaining hydrocarbon potential of deepwater exploration. The basis for this time and depth mapping is the interpretation of modern seismic data from the 225,000 line km Brazil 99/2000 program, the largest regional 2D seismic survey offshore Brazil. Regional seismic interpretation mapping of the pre-stack time migrated data produced seven key sequence boundary maps: Sea-floor, Intra-Oligocene, Top Cretaceous, Top Albian, Top Salt, Base Salt and Top Basement. Iso-time maps were subsequently constructed for the major tectono-stratigraphic mega sequences: syn-rift-lacustrine, transitional-transgressive and drift-open marine.
- South America > Brazil > Rio de Janeiro > South Atlantic Ocean (0.47)
- South America > Brazil > Espírito Santo > South Atlantic Ocean (0.28)
- Phanerozoic > Mesozoic > Cretaceous > Lower Cretaceous > Albian (1.00)
- Phanerozoic > Cenozoic (1.00)
- Geology > Structural Geology > Tectonics > Salt Tectonics (1.00)
- Geology > Structural Geology > Fault (1.00)
- Geology > Sedimentary Geology > Depositional Environment > Marine Environment > Deep Water Marine Environment (1.00)
- (3 more...)
- South America > Ecuador > Orellana > Amazon Basin (0.99)
- South America > Brazil > Rio Grande do Norte > South Atlantic Ocean > Potiguar Basin (0.99)
- South America > Brazil > Campos Basin (0.99)
- (4 more...)
The Effect of Stretch Free Stacking On a Clastic Exploration Play In Alberta, Canada
Hunt, Lee (Ketch Resources Ltd.) | Trickett, Stewart (Kelman Technologies Inc.) | McKenny, Pat (Kelman Technologies Inc.) | Link, Brian (Kelman Technologies Inc.) | Jamieson, Scott (Jamiesco Seismic Exploration Ltd)
Summary A 3-D seismic survey was shot over a set of spatially complex channel leads that were thought to be charged with both gas and water. The prospects being investigated suffered from spatial and temporal reservoir resolution problems as well as fluid risks. In the attempt to address these challenges, the seismic data was processed using a new algorithm that promised to handle the long offset information advantageously. This algorithm is a new process that is meant to eliminate NMO stretch effects in the stack. Since fluid estimation was of such concern in this dataset, the algorithm was also used to create NMO stretch free gathers for AVO analysis.
Seismic Facies And Attribute Analysis of the Miocene Incised-valley-fill And Submarine-canyon Systems In Tuxpan Basin, Offshore México
Fouad, Khaled (Bureau of Economic Geology) | Ambrose, William A. (Bureau of Economic Geology) | Brown, Frank (Bureau of Economic Geology) | Jennette, David (Bureau of Economic Geology) | John, A. (School of Geosciences, The University of Texas at Austin) | Jackson, Katherine G. (School of Geosciences, The University of Texas at Austin) | Aranda, Mario (PEMEX Exploración y Producción) | Hernandez, Ulises (PEMEX Exploración y Producción) | Ruiz, Hector (PEMEX Exploración y Producción) | Velez, Daniel (PEMEX Exploración y Producción)
Summary In this study, we demonstrate the seismic facies and attribute analysis in upper Miocene incised-valley-fill and submarine-canyon systems in the Laguna Madre-Tuxpan area north of Veracruz. Following initial structural identification by PEMEX geoscientists, seismic imaging techniques were used to build a stratigraphic model on the basis of seismic sequence and attribute analysis. Seismic wave-shape analysis using neural-network wavelet classification was employed to describe the canyon-fill deposits. These techniques were applied in the imaging of lower-canyon-fill successions that are inferred to be sandstone-rich where they onlap onto faulted submarinecanyon margins. In contrast, overlying upper-canyon-fill deposits from progradational highstand delta-front deposits consist of thin delta-front sandstones intercalated with distal prodeltaic siltstones and are genetically associated with a fine-grained succession providing a shaly drape over the sandy lower-canyon-fill.
- Geology > Geological Subdiscipline > Stratigraphy (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Sandstone (0.57)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock (0.50)
- Geophysics > Seismic Surveying > Seismic Interpretation (0.71)
- Geophysics > Seismic Surveying > Seismic Processing (0.67)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > North America Government > Mexico Government (0.51)
- North America > Mexico > Veracruz > Veracruz Basin (0.99)
- North America > Mexico > Gulf of Mexico > Veracruz Basin (0.99)
Seismic Methods In Coalbed Methane Development, Red Deer, Alberta, Canada
Richardson, Sarah E. (Department of Geology and Geophysics and CREWES, University of Calgary) | Lawton, Don C. (Department of Geology and Geophysics and CREWES, University of Calgary) | Margrave, Gary F. (Department of Geology and Geophysics and CREWES, University of Calgary)
Introduction Summary Vertical seismic profiles of a coalbed methane test well near Red Deer, Alberta provide useful data regarding the physical properties of the coal and its suitability for development. Analysis of three different test sources indicates that a mini P-wave truck-mounted Vibroseis is an effective source for this test site, allowing high resolution data leading to the identification of intra-coal events. Vp/Vs analysis of the strata indicates Vp/Vs of greater than 3.0 in the shallowest section (<100 m depth) decreasing to 2.5 at a depth of 300 m. A site in Alberta, near Red Deer, has been selected to test enhanced coalbed methane (ECBM) production using CO2 injection into the Ardley coal zone. The late Cretaceous Ardley coal zone has CBM reserves estimated at 52 TCF and gas contents ranging from 2.0 to 5.5 cc/g throughout the province of Alberta (Beaton, 2003).
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Coal seam gas (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Near-well and vertical seismic profiles (1.00)
INTRODUCTION ABSTRACT Acoustic quadrupole waves have recently been introduced to measure formation shear velocity under LWD conditions. Field applications have created demands for understanding of the tool behavior in anisotropic formations. In this study, we investigate what the tool measures in a transversely isotropic formation using a finite-difference model. We observe that the quadrupole wave splits into earlier and later arrivals in deviated wells, corresponding to the faster and slower shear velocities, respectively. This is true for a fast, intermediate, or slow formation. Therefore, it is practical in many cases to detect and even measure formation shear anisotropy with a quadrupole tool. The quadrupole wave has two important properties. First, the wave is little contaminated by tool modes propagating through the drill collar. Second, quadrupole waveforms measure directly the true formation shear velocity at low frequencies (Tang et al., 2002a).
- Geophysics > Borehole Geophysics (1.00)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling (0.82)
Summary Data compression plays an important role in well logging operations. This paper presents a data compression method based on a discrete wavelet transform (DWT). The method consists of a two-dimensional DWT and set partitioning in hierarchical trees (SPIHT) coding of the DWT coefficients. The four advantages of the proposed DWT-based compression method are (1) superior compression performance; (2) simple and effective hardware implementation; (3) embedded coding for successive approximation (or refining) and progressive transmission of data; (4) constant compression rate or recovery distortion controlling. These advantages allow simple and effective implementation of the proposed method. In addition, the proposed method is generic. It is suitable for compressing various types of logging data, such as resistivity and acoustic data.