Wave Field Modeling And Attribute Research On The Composition Porous Liquid Media

The thesis relies on my tutor's Natural Science Fund Project: The Gas Hydrate'sSaturation Research on The Basis of The Composition Elastic Porous Media and the 863Program Project: Marine Reservoir Monitoring Techniques with Time-lapse Seismic, basedon the composition elastic porous media theory, using the finite-difference method realizesthe numerical modeling of seismic wave in the three-phase composition elastic porousliquid media model, analyses and summarizes seismic wave propagation characteristic inthis model. And then combining with practical reservoir, studies the changes of correlativeseismic attributes in the course of fluid substitution. The researches can be expanded toexploration and development fields of oil, natural gas and water resource etc. which havegreat theoretical and practical significance for people to understand wave propagation rulesin the fluid-saturated porous media and represent underground media constitution andlithology characteristic.On tutor guiding and inheriting previous authors' results, mainly research as follows:1,Simply descripts the Biot theory, the theory of the composition porous media and thedeveloping history and present situation about wave field numerical modeling.2,Clarifys the composition calculation formula of elastic parameters in this model,these formulas are called the composition equation method of porous media. It sets up newwave equation and velocity expression of this media, and contrasts with the empiricalformula. These contents is the basic of the succeeding researches.3,It sets up staggered-difference scheme of two-dimensional wave equation for thismedia, and discusses its initial conditions, stability conditions, boundary conditions.Thenprogramming by VC++ implements the numerical modeling of seismic wave in thethree-phase composition elastic porous liquid media model, simulates snapshots andsynthetic seismograms in various theoretical geologic models, analyses and explanscompressional wave, shear wave, and their reflection, transmission, refraction anddiffraction, accordingly summarizes seismic wave propagation regulations in this media.4,Based on above researches, mainly analyses the variation of correlative seismicattributes. First works out the changes of elastic parameters with porosity and saturationaccording to composition equation method of porous media. secondly simulates snapshotmaps, the differential sections of snapshot and synthetic seismogram as different porosityand saturation by forward modeling program, and generates vibration maps and differentialvibration maps. Finally combining with the BoHai experimental region reservoir,quantificationally analyse the effect of porosity and saturation on wave field.5,It sets up new NIU2 formula for this media, then selects proper model to calculatethe change trend of density, velocity and poisson's rate with porosity and saturation, andcontrast with the composition equation method of porous media.