BZ地区高分辨率三维地震采集技术探讨

Discussion on high resolution 3-D seismic acquisition technology in BZ area

（1.中国地质大学(北京),北京100083;2.中国石油化工股份有限公司勘探南方分公司,四川成都610041）

China University of Geosciences (Beijing), Beijing 100083, China

川东北BZ地区YB区块的生储盖配置好，是油气勘探的有利区域。该区地表为山地，地面障碍多，野外资料采集困难；主要目的层埋藏深，跨度大，地质目标体多为薄层、礁滩体、超覆体和岩性圈闭等形式，为隐蔽型构造。因此，提高勘探分辨率，提高识别隐蔽构造的能力是YB区块三维地震勘探要重点解决的问题。为此，开展了提高分辨率的三维地震采集方法研究，最终形成了精细表层结构调查、波场快照技术模拟优选激发接收参数、优化三维观测系统设计的技术系列。模拟试验和实际应用效果表明，地震资料的分辨率有了大幅提高，勘探目标地质特征更加清晰，可以满足储层预测的要求。

The source-reservoir-cap assemblages of YB block are very good and so the area is a beneficial one for exploration in BZ, northeast Sichuan basin. The surface is mountainous with many barriers, making it difficult for field acquisition. The target horizons are deeply buried with a long stretch. Most of the geologic targets are subtle structures with thin layers, reef-beach bodies, overlapping bodies, and lithologic traps, etc. Therefore, the improvement of resolution and the ability for recognizing subtle structures are the key problems to be solved for 3-D seismic exploration of YB block. The 3-D seismic acquisition method for improving resolution was studied. Finally, the technology with detailed surface structure investigation, optimization of shooting and receiving parameters by snap shots of wave field, and optimization of 3-D survey design was formed. The model test and actual application results show that the resolution of seismic data has been greatly improved and the geologic characteristics of exploration targets are clearer, quite capable of satisfying the requirements of reservoir prediction.