A Study On Modeling And Inversion Of The Anomalous Pressure

The exploration of the oil and gas indicated the anomalous pressure is related tothe production, transportation, congregation of oil and gas. Therefore, it is importantfor us to study on the anomalous pressure, we can find the oil, gas and gas hydratequickly.There are four points to study on the anomalous pressure. Firstly, study on howthe anomalous pressure comes into being. Secondly, base on a simple pressure model,on which, the pore pressure changes from low hydrostatic pressure (15MPa) to thelimit of confining pressure(30.7MPa), the increment of the pore pressure is 0.1MPa .The free gas saturation is respectively equal to 2% and 20%, and the distribution offree gas in the pore space is uniform or patchy. Material properties of marinesediments above the BSR in the case of 2% the gas hydrate concentration and 20%the gas hydrate concentration. We can compute to the value of the compressionalwave and the shear wave from the theoretical model Biot-Geerstma-Smith equations.Thirdly, make use of physical properties, AVO and AVO properties to analyze thechange of the anomalous pressure affect on these properties. Lastly, pick up theseproperties from the real data of Blake Ridge. Refer to the modeling properties figureof Blake Ridge, analyze and explain the distribution of the pressure from the gashydrate layer, BSR in Blake Ridge.Finally, I make a summary of the paper and draw some conclusions detailedly.