川东灰岩出露区地震采集观测系统优化设计及应用

打开文本图片集

中图分类号：P631 文献标识码：A DOI：10.13810/j.cnki.issn.1000-7210.20240471

Abstract：Due to the high and steep underground structure in the limestone outcropping area of the eastern Sichuan Basin，the conventional geometryhas some problems，such as uneven ilumination and insuficient partial ilumination energy.Forthe high and steep structure of the eastern Sichuan Basin with high-precision seismic imaging，seismic ilumination analysis is an important method to guide the optimized design of seismic acquisition geometry in the region. By combining the surface and underground geological conditions in limestone outcropping areas of the eastern Sichuan Basin，this paper establishes the demonstration technology and process of geometry encryption based on seismic ilumination analysis.By conducting the design and demonstration of geometry encryption of the underlying structure in the limestone outeropping areas，the seismic illumination energy of the local shadow area of the geological target is effectively improved. Firstly，the surface encryption range is determined by adopting the 2D forward model for reverse illuminationanalysis，and then by employing the 3D geologicalmodel forforward modelinganalysis combined with the actual seismic data analysis，the acquisition geometry encryption scheme suitable for the limestone outcropping area in eastern Sichuan Basin is obtained.The technological implementation and application show that adding receiving linesat the topofthe structurecanefectively improve the seismic imaging effectof the highand steep complex structure area inthe east Sichuan Basin，and a technically effctive and economically feasible encryption scheme for the geometry can be obtained.

Keywords： eastern Sichuan area，limestone outcropping areas，high precision，seismic illmination，geometry，signal to noise ratio （SNR）

王晓阳，王勤耕，巫芙蓉，等，川东灰岩出露区地震采集观测系统优化设计及应用[J].石油地球物理勘探， 2025，60（4） ：861-869.

WANG Xiaoyang，WANG Qingeng，WU Furong，et al. Optimized design and application of seismic acquisition geometry in outcropping areas of limestone in eastern Sichuan Basin[J]. Oil Geophysical Prospecting，2025， 60（4） ：861-869.

0 引言

随着油气勘探开发力度的不断加大，目标更加复杂、隐蔽，尤其在高陡构造区提升地震资料精度的需求也日趋迫切。（剩余10278字）