双井与地面数据集的透射与反射层析成像

井间层析成像技术是一种高效，精确的全局寻优反演方法，常用于井间范围内的油气藏动态监测，寻找井间隐蔽的小构造小断块，具有较高的实用价值。为了克服井间有限观测角的限制，学试在层析反演过程中引入反射波信息，并利用ＶＳＰ观测系统与井间观测系统的相似性，设计了一套地面激发，双井与地面变炮间距接收的地震观测系统，弥补了常规ＳＶＰ观测信息量不足的缺点，同时较大程度地增加了观测角。最后对这一观测系统进行了数值模拟

Transmissive and reflective tomography of dual-borehole and surface seismic data

Cross-borehole seismic tomography is an effective and accurate globaI optimum inversion method. It is used to make cross-borehole dynamic hydrocarbon monitoring, and to find some subtle structures and minor fauIts between boreholes. To cope with the limitation of cross-borehole observation angle, reflection wave is introduced in tomographic inversion. In terms of similarity between VSP observation system and cross-borehole observation system, a new seismic observation system is designed in which seismic wave is generated on surface but received both in boreholes and on surface with variable offset. As a result, the deficiency that ordinary VSP data are not enough is removed, and observation angle is enlarged in quite big degree.The numerical modeIing of this observation system is made desirably. Transmissive and reflective tomography methods are used to achieve satisfactory inversion of both velocity and structure shape between boreholes.