Some issues in applications of seismic crooked line
YANG Qing-dao1,2, WANG Wei-feng1, YIN Yi-dong2, ZHAO Yu-sheng2, LI Ji-bai2
1 College of Geo-resources and Information,Chinaa University of Petroleum(East China),Qingdao,Shandong 266555,China;
2. Yunnan Geophysical Company of Southwest Petroleum Bureau,Sinopec,Kunming,Yunnan 650023,China
Abstract:Seismic crooked lines have been widely used for oil and gas or coal exploration in complex surfaces as they have obvious advantages,such as avoiding huge obstacles and improving data quality by means of choosing optimal source points and receiver locations.This work reviews the following solutions of crook line application from our field practices: ① In loess area,sources and receivers of crooked line are laid in the deep valley to avoid thick loess layer improve data quality;② In areas of clastic rock and carbonate rock alternately outcropping on the surface,crooked line should be lay out in clastic rock area avoiding shooting and receiving on carbonate outcropping surface;③ Crooked line can be lay out to keep away from large obstacles such as villages,cliffs,reservoirs and others for safe operation;④ Sources and receivers can be distributed more flexibly in order to cut down the operation cost.On the other hand,midpoints can be scattering to any direction with crooked line survey.This is a challenge for common midpoint bin gather stacking as well as the data credibility.In this paper,we propose a few specific measures for controlling midpoints scattering in data acquisition and processing from the spatio-temporal conditions of CMP's stacking to ensure authenticity of the final data.