Software Development And Application For Gas Hydrate Identification

Gas hydrate is an ice-like solid formed by water and natural gas under high pressures and low temperatures and it has the advantage of huge reserves,high combustion value and clean,no contaminating.It is considered as the ideal one of these potential future energy sources.The research and software development for gas hydrate identification is very necessary to assess its potential in the future energy exploration,and it has strategic significance of energy and environment.Bottom simulating reflector(BSR)and velocity characteristics are often used to identify gas hydrate.In order to improve the reliability of gas hydrate identification,the ratio of p-wave increment to s-wave velocity increment which is proved by professor Liu can distinguish the high velocity characteristic caused by hydrate factor from non-hydrate.Therefore,my thesis which is funded by the international cooperation project is mainly about gas hydrate identification software development based on the ratio of p-wave increment to s-wave velocity increment in order to inform a set of special hydrate recognition software.This paper mainly focuses on four parts: firstly,gas hydrate identification technology;Secondly,the basic theory and process of AVO inversion,because we need inverted velocity.Thirdly,the analysis of integrated requirements and structure design about software in accordance with theories.The paper constructs and optimizes the structure and function of the software anew,and it has solved the existing problems and modified some unstable algorithms.The program also adds new algorithms and functions,besides,some relative aided modular based on the new software framework,a dedicated hydrate recognition software has formed.Ensure the software running on cross platform,the programming used the C++ and Qt.The software mainly includes: AVO inversion required function module,hydrate recognition module,drawing and analysis module,auxiliary module and other functional modules,each module also includes many functions;finally the software is tested and verified by actual data of Qiongdongnan,the results show that the algorithms are stable and the results are reliable.The software has high computational efficiency,simple operation,more complete function,and is suitable for 2D and 3D area.It meets the demands of scientific research and production tasks well.