GD地区火成岩地震采集方法研究

Method of Igneous Rock Seismic Data Acquisition in GD Area

火成岩发育区一直是地震资料采集的难点,主要是火成岩侵入对正常地层的反射形成干涉和屏蔽作用,GD地区主要分布两套火成岩,上套火成岩在E1f4-E2f2地层中侵入,下套侵入在E1f2-E2f4地层中,造成目的层反射波组特征不清,严重影响地震资料品质。通过研究该区火成岩的特点,认为加大激发能量、增加近、中炮检距道数和覆盖次数有利于改善该区火成岩下覆地层的资料品质。在实际应用中取得了较好的效果。

The area of igneous rock development was a problem of seismic data acquisition,where interference and shield were created by the igneous rock intruding into strata.In GD Area there mainly developed two sets of igneous rocks,the upper igneous rock was invaded in the stratum of E1f4-E2s2,the lower igneous rock was invaded in the stratum of E1f2-E2f4,it caused unclear characteristic data in the target zone,the quality of seismic data was severely affected.By studying the characteristics of igneous rock in this area,it is considered that it can improve the quality of seismic data in the lower stratum by increasing the excitation energy,geophone distance and fold,by which a very good result is achieved.