Research On Rock Physics Numerical Computation Method Of Density And Velocity Of Hydrate

The content of the dissertation is mainly about doing research on a model of gas hydrate reservoir, using the theory of the homogeneous isotropic elastic two-phase solid medium, which is based on the media model of components fluid porous medium proposed independently and innovatively by my mentor, Professor Binhua Niu. Meanwhile, author also study on the inversion problem with the measured data that got in the gas hydrate zone in ODP Legs, in which gas hydrate has been sampled, such as Leg 164、Leg 204. Firstly, to summarize the geological conditions through ODP Leg 164 and Leg 204, introduce the background in the range of the gas hydrate zone. Secondly, according to the essence of the media model of components fluid porous media and the characteristic of gas hydrate, we proposed the component equations on the two-phase solid medium. At last, respectively using the measured data from Site 991 hole A、Site 995 hole A、Site 996 hole E、Site 997 hole A to calculate theoretical results by component equations, proving that the method is reasonable and valid.With the help from my mentor and the previous achievement, we can conclude the results as follows:1、Proposing the model of homogeneous isotropic elastic two-phase solid medium which is applied to gas hydrate, and give out the component equations of density and velocity.2、Using the measured data by ODP, to calculate the theoretical density, both static and dynamic, through three linear inversion methods, including forward numerical calculation, inversion numerical calculation, double numerical calculation, and compare the results of the inversion that indicated the feasibility of the methods.3、With the measured data from gas hydrate samples by ODP, we show how to deal with the initial data at the beginning, the method can make a wide range data become more efficient, at the same time, we do inversion numerical calculation at different depth, analyzing the samples vary the porosity. 4、We can judge the position of the gas hydrate zone by P wave velocity, and then use the velocity component equation to prove it.