拖缆前后源双向同时激发采集新技术探索

摘要

常规拖缆采集时其单边激发、单边接收的作业模式会导致采集方位角单一.在潜山或高陡倾角构造区采用此方式采集地震数据时,会造成一侧照明不足、成像模糊.在分析常规拖缆采集作业局限性的基础上,提出了拖缆前后源双向同时激发采集技术,该技术可有效提升高陡倾角构造两侧的照明度.对比不同的实现方式,优选辅助震源船追随尾标航行激发的作业模式,首次在国内实现了拖缆前后源双向同时激发采集.渤海油田JZ区块实际应用结果表明,与常规拖缆采集相比,该方法有效提高了潜山面的成像效果,提升了高陡倾角构造区拖缆作业潜力;其技术流程可行,作业模式合理,对挖掘拖缆作业潜力有一定的借鉴意义.%Conventional towed cable seismic acquisition operational mode causes unilateral sufficient illumination and blur image at buried hill or high-steep structure area due to its single-side shooting and single-side receiving with single azimuth.We put forward acquisition design of fore and after source double-way simultaneous shooting through analyzing limitation of conventional towed cable to improve illumination of both sides for the high-steep structure.In China,fore and after source double-way simultaneous shooting operation is firstly carried out with optimal selection the operation mode,in which the assistant seismic vessel is shooting by chasing the tail-buoy by comparing the different implementations.The application in JZ block proves that:compared to conventional towed cable seismic acquisition,the new method can improve the imaging of buried hill and fully promote the operational potentiality in buried hill and high-steep structure area.The technical process is feasible and the operation mode is reasonable,which is of significant reference for potentiality exploitation of towed cable seismic operation.