【摘要】 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。更多还原

【Abstract】 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 hori- zons are deeply buried with a long stretch.Most of the geologic targets are subtle structures with thin layers,reef-beach bodies,o- verlapping bodies,and litholngic traps,etc.Therefore,the im- provement of resolution and the ability for recognizing subtle struc- tures are the key problems to be solved for 3-D seismic exploration of YB block.The 3-D seismic acquisition method for improving res- olution was studied.Finally,the technology with detailed surface structure investigation,optimization of shooting and receiving pa- rameters by snap shots of wave field,and optimization of 3-D sur- vey design was formed.The model test and actual application re- sults show that the resolution of seismic data has been greatly im- proved and the geologic characteristics of exploration targets are clearer,quite capable of satisfying the requirements of reservoir prediction.更多还原