摘要
四川桂花三维地震资料采集属页岩气低密度三维地震,针对炮道密度低、覆盖次数低、二叠和三叠纪灰岩激发占比较大等特点,采用层析静校正、弱信号保护等处理技术,有效解决了研究区低信噪比问题;利用叠前数据五维数据重构处理方法,有效解决了受大型障碍物影响而导致的面元及偏移距分配不均等问题,提高了信噪比,为叠前深度成像处理奠定了基础。针对灰岩低噪比和高陡构造的准确成像问题,采用基于构造约束的网格层析速度建模结合叠前深度偏移成像方法,保证了成像效果。
The 3D seismic data acquisition of Guihua,Sichuan,falls into the low-density 3D seismic of shale gas.Aiming at the characteristics of low density of shot path,low coverage times and large excitation ratio of Permian and Triassic limestone,the processing techniques such as tomographic static correction and weak signal protection were adopted to effectively solve the problem of low signal-to-noise ratio in this area.By using the five-dimensional data reconstruction and processing technology of pre-stack data,the uneven distribution of surface elements and offset caused by large obstacles was effectively solved,and the signal-to-noise ratio was improved,which lays a foundation for pre-stack depth imaging processing.Aiming at the problem of accurate imaging of limestone structures with low noise ratio and high steepness,the grid tomography velocity modeling technology based on structural constraints combined with pre-stack depth migration imaging technology ensured the imaging effect.
作者
杨小龙
Yang Xiaolong(Research Institute of Petroleum Exploration and Development,East China Oil and Gas Company,SINOPEC,Nanjing 210007,Jiangsu,China)
出处
《地质学刊》
CAS
2021年第4期420-424,共5页
Journal of Geology
基金
“十三五”国家科技重大专项“彭水地区常压页岩气勘探开发示范工程”(2016ZX05061)。
关键词
灰岩
三维地震
高陡构造
弱信号保护
五维插值
构造约束速度建模
四川桂花
limestone
3D seismic
high steep structure
weak signal protection
five-dimensional interpolation
velocity modeling based on structural constraint
Guihua in Sichuan
