【摘要】 苏丹某三维复杂探区位于中非裂谷带-苏丹裂谷盆地,地表为干燥松散巨厚的风化层,深层火成岩巨厚、不稳定、断层比较发育,断块破碎严重。常规地震勘探的深层资料品质很低并缺失高频和低频信息,导致该探区断层和构造解释存在多解性,影响了该区勘探潜力的评价及下一步井位的部署。采用低频可控震源激发减少了地表及地下火成岩对能量的屏蔽,增加了下传能量,提高了深层成像效果。该探区首次采用东方地球物理公司自主研制的BV-620LF低频可控震源在苏丹非洲草原和灌木丛地区进行应用,通过采用一系列的技术措施和合理的生产组织方式,解决了采集设备丢失严重的问题。同时,实现高效采集,又获得较好的资料,提高了深层成像效果。说明BV-620LF可控震源具有在该类地区作业的能力,值得在类似地区推广应用。更多还原

【Abstract】 A 3 D complex exploration area in Sudan is located in the Central African Rift Valley-Sudan Rift Basin. The surface of the area is a dry, loose and extremely thick weathered layer. Deep igneous rocks are extremely thick and unstable. Faults are relatively developed and the fault blocks are severely fractured. The quality of deep data in conventional seismic exploration is very low and the high frequency and low frequency information are missing, which leads to the multi-solution of fault and structural interpretation in the exploration area, which affects the evaluation of exploration potential and the deployment of the next well position. The use of low-frequency vibroseis excitation reduces the shielding of energy from surface and underground igneous rocks, increases the downstream energy, and improves the deep imaging effect.TheBV-620 LF low-frequency vibroseis independently developed by BGP has been applied to the grassland and bush areas in Africa of Sudan for the first time. By adopting a series of technical measures and reasonable production organization, the problem of serious loss of acquisition equipment has been solved. At the same time, efficient acquisition is realized, better data are obtained, and the deep imaging effect is improved. This shows that BV-620 LF vibroseis has the ability to operate in such areas and is worthy of popularization and application in similar areas.更多还原