中国大陆科学钻探孔区全观式三维地震采集

大陆科学钻探不仅是打一口钻，而是深部钻探同地球物理遥测结合起来的相互反馈系统，这里地球物理遥测主要是指三维深反射地震. 中国大陆科学钻探孔区三维地震调查是大陆科学钻探工程的一项重要内容. 在数据采集中提出了全观式三维地震调查新技术，它是指排列不滚动的三维地震调查，即将地震检波器铺满全部测区的一种地震采集方法，尤其适合于有限面积的三维地震工作. 这种方法的优点是：(1)快速高效; (2)叠加次数高; (3)与常规三维地震相比成本大幅度减少. 在中国大陆科学钻探孔区内进行的全观式三维地震测量，全面实现了预期目标,包括：(1) 配合钻探查明孔区地质构造，将钻探的一孔之见扩展到深6000m、长宽超过3000m的三维岩柱；(2)提供高精度定位的地壳反射体以供标定；(3)发现中、下地壳及地幔内的反射体等.

All_laid_out three_dimensional seismic survey at the Chinese Continental Scientific Drilling site

Continental scientific drilling does not means only making a hole,but means to form a feedback system of deep drilling technology and geophysical telemetry that is mainly 3-D seismic survey.Seismic reflection investigations have been carried out for the Chinese Continental Scientific Drilling Project(CCSDP) as an important item.We designed a new method,called all-laid-out three-dimensional survey,for the 3-D seismic investigation at the CCSD drilling site.The new method does not roll shot-geophone configuration during the survey,i.e.,lays out geophones all over the survey area,very proper for 3-D seismic survey in small areas.The advantages of the new method include(1) high efficiency and saving time;(2) high stack fold numbers;and(3) greatly reducing the survey cost.The experiment with the method at the CCSD site completes all the aims of the 3-D survey,including(1) locating geological structures around the CCSD main hole of 5000m;(2) providing highly-accurate 3-D reflectors for future calibration,and(3) finding deep reflectors in the lower crust and mantle.