东辛地区三维地震野外观测系统的选择及效果

东辛地区已勘探开发20多年,但由于地表和地下地质情况复杂,该区的地质构造形态和断裂系统始终没查清楚,经常造成钻探失误。为此,在该区进行了三维地震勘探工作。首先,根据已知地质及物探资料,结合该区具体情况,严格选择了地震资料野外采集参数。然后在施工中采用了17种野外观测系统,有效地避开了地表某些障碍物的影响,从而保证了地下三维观测点网的完整性和覆盖次数的均匀性。利用这块三维地震资料,发现新含油区块5个,在原含油区块中发现新高点18个。在已完钻的107口井中有102口井见到工业性油流,钻探成功率在95％以上。

Choice of field layouts for three-dimensional seismic exploration in Dongxin area, and the application effect

Exploration and development in Dongxin area have been done for more than 20 years, The subsurface geological structure and fault system in this area were not ascertained in many years because of the complicated subsurface geological structure and troublesome surface conditions, so that drilling exploration often failed. Consequently, threedimensional seismic exploration was conducted in this area. First,field acquisition parameters were correctly determined by comprehensively analysing known geological materials, geophysical, data and other conditions in this area. Then some surface obstacles were effectively avoided by taking 17 different field layouts, thus ensuring complete subsurface three-dimensional data point network and uniform multiplicity. Five new hydrocarbon-bearing blocks and 18 new seismic highs in old hydrocarbon-bearing blocks have been discovered by interpreting these three-dimensional seismic data. 102 wells of 107 completed wells have industrial oil flows, success rate being above 95%.