Seismic Numerical Forward Modeling And Migration For The Complex Geological Body

Complex geological body is main types of complex oil and gas reservoir, and it's irregular geometrical shape and acutely variable velocity have an effct upon the accurate imaging of complex reservoir. The dissertation focuses on seismic wave-field numerical forward modeling and migration for the complex geological body. The dissertation focuses on seismic wave-field numerical forward modeling and migration for the complex geological body. The paper integrates and researches the wave-field extrapolation operator for lateral variation of velocity, analysis of the migration velocity and the wave-field characteristic, numerical forward modeling, time migration and depth migration of 2D pre-stack seismic wave-field. In term of analyzing and summarizing the existing achievement, an advanced and practical wave-field extrapolation operator and arithmetic of the complex model building, numerical forward modeling and migration are advanced.Firstly, the paper starts from the one-way wave equation of wave-field extrapolation, research the relationship and transform condition of wave-field extrapolation operators, and improves on the wave-field extrapolation operator and so heighten the operation efficiency, Through the model SEG salt dome imaging test compared the PS, SSF, FFD several operator of the pros and cons, and finally selected for dramatic changes in the horizontal speed, speed and high precision imaging of the FFD wave field extension operator for volatility EquationSecondly, In order to achieve complex geology of the numerical simulation, based on the closed system of thinking describes the complex two-dimensional geological body, and described the establishment of a theoretical model of the way, against the actual data modeling, the proposed cycle iterative process modeling;and then, using methods discussed in detail FFD dense carbonate cave complex geological Body, the complex structure of the reef, such as the model forward modeling and migration.In order to analyze the seismic wave field to the cave seismic characteristics, the paper used to simulate the side through the cave complex numerical simulation summed up dense carbonate reservoir cave and the characteristics of the wave-field with the cave to cave in the high amplitude of the reflected wave impact, The width of the cave to cave reflecting changes in the amplitude of the impact of chaniges in the speed of fluid filling the cave reflected wave amplitude effects.On the reef in the numerical simulation, from the theoretical and practical model of a single reef and the reef base model, Simulation of the drape of the reef, uplift and other characteristics of the earthquake response, through migration and effective simulation of the reef at the top of the strong reflection, the internal mess reflection, symmetrical wings, and other characteristics,Finally, summed up the characteristics of the corresponding wave field for the actual interpretation of seismic data processing and provide the necessary theoretical support, that has a theoretical and practical value.