大井间距井间地震观测试验

介绍了井间地震数据采集方面取得的最新进展．为了使我国井间地震技术实用化，开展了大井间距井间地震数据采集试验．通过地面浅井激发深井接收、深井激发深井接收、不同炸药量、不同传播距离试验，确定了井间地震观测参数．应用改进后的井中安全炸药震源、一个三分量井中检波器和常规数据记录系统，在陕北顺宁油田的顺3井、顺4井和顺5井3口生产井中成功采集到两对大井间距、深井、油井中的井间地震资料，两对井的井距分别为307．92m和470．36m，采集井段为904．31-1272．32m．共设计了4种观测方式，采集到800多炮井间地震记录，对油井无损害．改进型井中安全炸药震源在使用效率和寿命方面有显著提高，可用于商业性并间地震数据采集．

CROSSWELL SEISMIC SURVEY WITH LARGE INTERWELL SEPARATIONS

In order to commercialize crosswell seismic techniques in China, we conducted a crosswell seismic field data acquisition experiment of large well separations in our research program at Shunning oil field, Shanxi province, northwest China. This paper reported the advances of this experiment. Data acquisition parameters were determined by experiments on different amount of dynamite and propagation distances by shooting in surface shallow open hole and recording in deep well and both shooting and recording in deep wells. Crosswell seismic data sets among three producing wells were successfuly collected by using a downhole dynamite seismic source, a three-component downhole geophone and convenhonal recording system with a well-to-well distane of 3O7.92m between well S3 and S4 and of 470.36m between well S3 and S5 in this acqinsition and the depth ranged from 904.31m to 1272.32m. Totally four types of acqinsition layouts were designed and more than eight hundred shots were recorded without damage to producing wells. The operation efficiency and life-span of the improved safe dynamite downhole seismic source were notably enhanced by reforming the design and marerial selection. The downhole dynamite seismic source can be used for commercial crosswell seismic data selection.