合肥盆地近地表结构调查和地震激发方式选择

Investigation on surface geologic structure and selection of seismic shooting mode at Hefei basin

（1.中国石油化工股份有限公司胜利油田分公司，山东东营257000；2.中国科学院地质与地球物理所，北京100029；3.中国石油大学（华东），山东东营257000）

Shengli Oilfield Branch Company,Dongying 257000,China

合肥盆地地震勘探程度低，激发条件复杂。为查清近地表地质结构，合理地选择激发方式，在分析以往资料的基础上，通过野外露头地质调查、岩石物性测试和地质浅钻等方法，对近地表的岩石厚度和物性等进行了分析研究，在此基础上将盆地划分为平原区、丘陵区、河流区和基岩区4种类型。通过对不同近地表地质结构地区的激发试验，分别选取了适合各类地区的激发参数和激发方式。实际应用表明，利用该方法可以获得品质较好的地震资料。在一条跨越各类近地表结构地区的地震测线上，不同地震剖面段的反射特征具有较好的一致性。

Hefei basin has a low degree of seismic exploration and a complex shooting condition.In order to ascertain the surface geological structure and to select a suitable shooting mode,we studied the thickness and properties of surface rocks based on the former data analysis and through field outcrop geology investigation.On this basis,we divided the basin into four surface types:plain area,hill area,fluvial area,and bedrock area.After the shooting testing in the area with different surface geological structures,shooting parameters and shooting modes suitable to the area were selected.Actual application shows that the method can achieve the seismic data with high quality.For a seismic line crossing all surface structure conditions,the reflection characteristics of the seismic profiles at the area with different surface geological structures are perfectly coherent.