Numerical Simulation Of Seepage And Oil And Gas Exploration

Problem on water infiltration in unsaturated soil are in the research field of water science Research on problem is very important in many field. It is ignored that variation of air pressure affects infiltration in research the problem early. In recent years, it is obtained from experiments that water infiltration is affected by air pressure, the problem on one-dimensional water infiltration is soloed by many researchers. In this paper two-dimensional water infiltration with air-out is considered and numerical simulation is made.Unsaturated infiltration is the process of factors coupling each other. On the basis of proper hypothetical conditions, the mathematic model of two-dimensional water infiltration with air-out is introduced by the analytical method of porous media. According to boundary conditions for non-overlapping domain decomposition method, the control system is established. It is shown that solutions for the system exist and are unique by the optimal control theory of distributed parameter system. The process of porous water infiltration and porous air-out in unsaturated soil are discussed through simulating. By comparing the numerical results of water infiltration with air and without air, it is shown that the method in this paper is more effective for solving problems of water infiltration in unsaturated soil.In this paper the forming process of oil-bearing basin is the main research object and the mathematic model of geology is built, in order to simulate the dynamic forming process of stratums especially oil-bearing stratum in geology history in the time and space concept, further to investigate the history of petroleum forming , transmitting , accumulating and predict the distributing rule and scope of petroleum, and offer an rapid , quantitative , exact , general choice for the researcher of petroleum geology. With denudation, poor-compactness and sedimentation hiatus, the stratum relations of sedimentation section is judged, and the ancient thickness and pressure of stratum layer are recovered by the inversion method of back stripping .The numerical simulation algorithm of recovery of geological history is also given.The research is one of the "973" National Major Fundamental Research/Development Project of "Formation, enrichment and distribution prediction of oil and gas in superimposed basin of China". The good results show the numerical simulation method is dependable, which are coincide better with those by other methods in Basin Centre of Petroleum University.Based on the model of geology and optimal algorithm, the software for "Recovery of Geology History System" is developed.