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Study Of Fracture-cave Reservoirs From Rugged Topography With Physical Modeling Technology

Posted on:2009-10-25Degree:DoctorType:Dissertation
Country:ChinaCandidate:Q ZhaoFull Text:PDF
GTID:1100360242493050Subject:Earth Exploration and Information Technology
Abstract/Summary:PDF Full Text Request
Taking the problems emerged from rugged topography and complex reservoirs, this article studied in detail the methodologies for modeling rugged topography, fractures, and caverns, as well as documented the propagation of waves traveling through rugged topography and karst-cavern reservoir. Some new insights have been reached.By adding contact switch, pressure sensor, and corresponding measuring circuit to the probe, we achieved data acquisition, pressure test, and elevation measurement simultaneously, which roughly overcomes the bottleneck in physical modeling for models with rugged topography.Based on the principles of interpenetrating polymer network and copolymerization, we studied the course of network interpenetrating and copolymerization of araldite with rubber and other polymers, and achieved blending of different polymers in line with the requirements of physical modeling materials. The resulted polymers are of good cross-linking level. It has been established a relatively integrated physical modeling material series that features velocities of low values through high values. The microscopic structures of fractures and caves are designed and realized by in-situ composite technology. The results provide an effective way for construction of fracture-cavern carbonate reservoir model.We acquired a 2-D seismic data of physical model with rugged topography and complex subsurface structures for the first time, vividly observed the effect of rugged topography on waves traveling in subsurface structures, and documented the propagation and characters of seismic waves under rugged topography. The resulted data provided test data for velocity analysis and migration directly from rugged topography.Combined experimental observations and theoretical analysis, I studied the scattering from anomalous bodies, seismic wave propagation in fracture-cavern models, seismic signatures of fracture and caverns, azimuthal anisotropy of fractures, and the seismic responses along with fracture density versus offset. The results provide bases for the identification of reflections of real fractures and caverns as well as prediction of fracture-cavern reservoirs. They are valuable information for decreasing the uncertainty of interpretation of data from carbonate rich areas and increasing the success rate of fracture-cavern carbonate reservoirs. The resulted data also provide test data for economic and feasible layout design.
Keywords/Search Tags:seismic physical modeling, rugged topography, physical modeling material, fracture and cave, seismic reflection signatute
PDF Full Text Request
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