摘要
重庆南川地区五峰-龙马溪组常压页岩气资源潜力大,发展前景广阔。该区具有复杂近地表和复杂构造的“双复杂”特征,地震资料品质差,采集成本高,制约了页岩气的勘探开发工作。深入分析前期资料,总结了该区地震采集的主要影响因素,将南川地区划分为“砂岩地表、向斜构造区”“灰岩地表、斜坡构造区”和“灰岩地表、高陡构造区”;提出了统一排列片接收、分区不同密度炮点激发的变密度三维观测系统设计,与前期施工方法相比,采集成本降低约13.56%;优化地震激发接收参数,提高了原始单炮品质;采用基于高清航测影像和全局寻优原则的激发点优化设计,提高全区整体资料品质及施工效率。2020年阳春沟变密度三维获得较高信噪比地震反射资料,落实该区构造格局。该技术适用于四川盆地周缘地表、地下“双复杂”区页岩气的地震采集。
The Wufeng-Longmaxi formation in Nanchuan area of Chongqing has great potential for atmospheric shale gas resources and broad prospects for development.This area is characterized by“double complexity”of complex near-surface and complex structure,poor quality of seismic data and high acquisition cost,which restrict the exploration and development of shale gas.The main influencing factors of seismic acquisition in this area were summarized,and the Nanchuan area can be divided into“sandstone surface,synclinal tectonic area”and“limestone surface,slope tectonic area”and“limestone surface,high and steep tectonic area”.The design of a variable-density 3D observation system with uniform array receiving and different excitation point densities was proposed,which reduced about 13.56%acquisition cost.The seismic excitation and receive parameters were optimized,which improved the quality of the original single shot.The excitation point optimization design based on high definition aerial image and global optimization principle was adopted to improve the overall data quality and construction efficiency.Through the application of the above techniques,the 3D seismic data with high signal-to-noise ratio were obtained,and the structural pattern of the area was confirmed.The technique is suitable for seismic acquisition of shale gas in the“double complex”area of surface and underground around Sichuan Basin.
作者
薛野
任俊兴
杨帆
赵苏城
蓝加达
XUE Ye;REN Jun-xing;YANG Fan;ZHAO Su-cheng;LAN Jia-da(East China Oil and Gas Branch Company, SINOPEC, Nanjing 210019, China)
出处
《科学技术与工程》
北大核心
2021年第29期12461-12469,共9页
Science Technology and Engineering
基金
国家科技重大专项(2016ZX05061)
中国石化科技开发部项目(P21087-3)。
关键词
页岩气
双复杂
低信噪比
变密度三维
观测系统
采集成本
shale gas
double complexity
low signal to noise ratio
variable-density 3D seismic
observation system
acquisition cost
