摘要
鄂尔多斯盆地西南部地表为巨厚黄土塬区,地表结构复杂,低降速带厚度变化快,沟中弯线受地形条件限制,测线成网困难,直测线采集资料信噪比和分辫率都较低,难以满足目前岩性勘探的需求。针对这种情况,在经过理论论证和生产试验后,研发了一套针对黄土塬地区的非纵地震勘探技术,这种技术兼顾吸收了黄土塬沟中弯线、黄土塬多线及三维地震勘探技术的优点,不仅避开了黄土塬近炮点强能量干扰,而且还展宽了叠加道集方位角。针对非纵地震资料特点,在保真保幅处理理念指导下,通过非纵资料处理技术攻关,提出了针对非纵资料的三维静校正技术、创新性应用三维噪声压制模块压制非纵测线相干噪声、改进了基于VSP测井合成记录的井控处理理念,形成了一套巨厚黄土塬区低信噪比非纵地震资料处理技术序列。
The huge-thick loess area in Erdos basin has complex surface conditions and the thickness of low velocityzone is various.The quality of straight-line survey is relatively bad,with terrible signal-to-noise ratio and resolution,and the survey grid of crooked-lines along ravines is sparse,thus the utility of seismic data is too limited tosatisfy current lithology exploration.The off-line seismic exploration technique developed in loess plateau area bytheory and test absorbed advantages from crooked line and multi-line exploration techniques in loess plateau area,as well as the3D seismic exploration technique,not only avoiding the near offset strong noise,but also expandingthe azimuth for the stacking trace gathers.According to the characteristics of off-line seismic data and under theguidance of relative amplitude preserved processing idea,through technical research of off-line seismic data processing,a3D static correction technique for off-line seismic data was proposed,3D noise suppression module wasapplied innovatively to suppress the coherent noise of off-line seismic data,the concept of well-controlled based onVSP synthetic record was improved and formed the off-line seismic data processing technology in huge-thick loessplateau area with low SNR.
作者
陈超群
高秦
何争光
田媛媛
商昌亮
CHEN Chaoqun;GAO Qin;HE Zhengguang;TIAN Yuanyuan;SHANG Changliang(Changqing Branch of Geophysical Research Institute, BGP Inc., CNPC, Xi’an 710021, China)
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2017年第1期143-151,157,共10页
Coal Geology & Exploration
基金
中油股份公司物探技术攻关项目(2013-03-02)~~
关键词
巨厚黄土塬
非纵地震资料
去噪
地震数据处理
huge-thick loess plateau
off-line seismic data
de-noising
seismic data processing
