Kirchhoff叠前时间偏移技术在页岩气地震勘探中的应用——以四川盆地綦江地区页岩气为例
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摘要
四川盆地綦江地区页岩气资源丰富,但构造非常复杂。详细分析了Kirchhoff叠前时间偏移处理技术中的关键参数(偏移孔径、偏移倾角、偏移距分组等)对复杂构造成像的影响,并进行叠前时间偏移和叠后时间偏移的对比。分析结果表明,叠前时间偏移处理结果包含了更加丰富的地震信息,深层复杂构造成像、断层及断点空间位置更加合理,能够较好地落实构造,反映其不整合及各种不同沉积结构的地质现象。
Shale oil and gas were rich in Qijiang Area of Sichuan Basin,but its structure was very complex.The effect of key technical parameters(offset aperture,offset angle,offset grouping,etc)of the Kirchhoff prestack time migration processing on the complex structure imaging were analyzed,the prestack time migration and post-stack time migration were compared.The result shows that prestack time migration results include more rich seismic information,deep and complex structure imaging and spatial location of faults and break are more rational,they can better implement the structure and reflect its unconformity and geologiacal phenomena of various sedimentary structures.
Shale oil and gas were rich in Qijiang Area of Sichuan Basin,but its structure was very complex.The effect of key technical parameters(offset aperture,offset angle,offset grouping,etc)of the Kirchhoff prestack time migration processing on the complex structure imaging were analyzed,the prestack time migration and post-stack time migration were compared.The result shows that prestack time migration results include more rich seismic information,deep and complex structure imaging and spatial location of faults and break are more rational,they can better implement the structure and reflect its unconformity and geologiacal phenomena of various sedimentary structures.
引文
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[3]张颍.三维地震叠前时间偏移处理技术应用与展望[J].石油勘探与开发,2006,33(5):536~554.
[4]马丽娟,郑和荣,陈霞,等.隐蔽油气藏地震预测技术新进展[J].地球物理学进展,2007,22(1):294~300.
[5]徐升,杨长春,刘洪,等.射线追踪的微变网格方法[J].地球物理学报,1996,39(1):97~102.
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