叠前时间偏移技术在潞安矿区的应用
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摘要
潞安某矿区构造较复杂,地层倾角大,以往开展的叠后时间偏移成像精度低且空间位置不够准确,为此对该区进行了三维叠前时间偏移处理。根据Krchhoff积分法叠前时间偏移处理原理,对该区叠前数据进行净化、振幅补偿、静校正等准备工作,并对其处理过程进行细化,以求得准确的偏移速度场。通过该区叠前时间偏移和叠后时间偏移的应用效果对比,可以看出,叠前时间偏移处理能较好地反映深层复杂构造及大倾角地层情况,其叠前时间偏移剖面中下组15#煤的同相轴连续性明显变好,断陷点更清晰,断层及断点空间位置更趋合理。结合本次实践经验,指出该项技术在实际应用中应注意其适用范围、处理流程及速度建模等问题。
The Luan mining area has rather complicated structures with large strata dips,previously processed poststack time migration imaging has only low precision and incorrect spatial limits,therefore 3D seismic data prestack time migration has carried out in this region.Based on Kirchhoff integral prestack time migration principle,carried out preparatory works including prestack data refining,amplitude compensation and statics,as well as elaborate division of process to get correct migration velocity field.Through prestack and poststack time migration application effect contrasting made out that the prestack time migration can reflect deep complex structure and larger dip angle strata better,the continuity of middle lower group No.15 coal phase axis on prestack time migration section obviously better,breakpoints clearer,fault and breakpoint spatial limits more reasonable.Based on practical experiences have pointed out that the scope of application,processing flow and velocity modeling of the technology should be paid attention to.
The Luan mining area has rather complicated structures with large strata dips,previously processed poststack time migration imaging has only low precision and incorrect spatial limits,therefore 3D seismic data prestack time migration has carried out in this region.Based on Kirchhoff integral prestack time migration principle,carried out preparatory works including prestack data refining,amplitude compensation and statics,as well as elaborate division of process to get correct migration velocity field.Through prestack and poststack time migration application effect contrasting made out that the prestack time migration can reflect deep complex structure and larger dip angle strata better,the continuity of middle lower group No.15 coal phase axis on prestack time migration section obviously better,breakpoints clearer,fault and breakpoint spatial limits more reasonable.Based on practical experiences have pointed out that the scope of application,processing flow and velocity modeling of the technology should be paid attention to.
引文
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