论文部分内容阅读
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，尝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VSP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，并用透射与反射层析成像方法反演了井间范围内的速度参数和构造形态，取得了较好的成像效果。
Cross-well tomography is an efficient and accurate global optimization inversion method. It is often used in the dynamic monitoring of oil and gas reservoirs within the interwell interval, looking for small structures and small fault blocks concealed in the interwell, and has high practical value . In order to overcome the limitation of the limited observation angle between wells, this paper attempts to introduce reflected wave information in the tomographic inversion process. Based on the similarity between the VSP observation system and the crosswell observation system, a set of ground-excited, double-well and ground- The seismic observation system received at a distance compensates for the shortcomings of the conventional VSP observations and at the same time increases the observation angle to a large extent. Finally, the numerical simulation of this observing system was carried out, and the velocity parameters and the structure morphology in the crosswell interval were retrieved by using the method of transmission and reflection tomography. Good imaging results were obtained.