强电磁干扰区CEMP采集方法
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摘要
松江盆地跨居中朝阶地准地台和天山兴安岭地槽区两大构造单元之上,地震勘探程度相对较低。经早期航磁资料解释,盆地最大埋深约4500 m。为较准确地推断盆地边界、断裂性质、产状和位置,了解盆地基底起伏形态和埋深,预测松江盆地内油页岩的展布特征,吉林油田于2007年在松江盆地布设CEMP测线3条,点距200 m,测线长度113 km,物理点586个。针对本区较强的直流干扰源的特性,通过模型正演分析、CEMP曲线形态分析、反演结果分析,表明本区CEMP勘探资料在1-22号有效频点频率范围之内,可以探测基底的埋深及其起伏形态,并针对干扰采取了切实可行的消减措施。
Songjiang Basin spans the two giant structural units which are the Sino-DPRK terrace paraplatform and the Tianshan-Xinganling geosynclinal area.This basin is relatively poorly explored.The maximum burial depth is interpreted as 4 500 m by using the early aeromagnetic data.In 2007,Jilin Oil Field Company deployed three CEMP survey lines with the spacing of 200 m,the length of 113 km and 586 survey points in Songjiang Basin in order to infer,more accurately,the boundary of basin,the characteristics,attitudes and locations of faults;to understand the basement relief and burial depth of the basin;and to predict the distribution of oil shale.In accordance of the characteristics of the relatively intensive interfering source in this area,it is indicated in this paper that the burial depth of the basement and its relief can be identified by means of interpreting CEMP data,in the concrete,exercising the analysis of forward modeling,the forms of the CEMP curves and the inversion resultant within the effective frequency scope ranging from Frequency 1 to Frequency 22.And also a feasible suppression technique against the interfering source is employed.
Songjiang Basin spans the two giant structural units which are the Sino-DPRK terrace paraplatform and the Tianshan-Xinganling geosynclinal area.This basin is relatively poorly explored.The maximum burial depth is interpreted as 4 500 m by using the early aeromagnetic data.In 2007,Jilin Oil Field Company deployed three CEMP survey lines with the spacing of 200 m,the length of 113 km and 586 survey points in Songjiang Basin in order to infer,more accurately,the boundary of basin,the characteristics,attitudes and locations of faults;to understand the basement relief and burial depth of the basin;and to predict the distribution of oil shale.In accordance of the characteristics of the relatively intensive interfering source in this area,it is indicated in this paper that the burial depth of the basement and its relief can be identified by means of interpreting CEMP data,in the concrete,exercising the analysis of forward modeling,the forms of the CEMP curves and the inversion resultant within the effective frequency scope ranging from Frequency 1 to Frequency 22.And also a feasible suppression technique against the interfering source is employed.
引文
[1]李学民.由大地电磁数据同时反演电阻率和磁化率参数的方法研究[D].成都理工大学,2005.
[2]孙卫斌,刘云祥,李德春,何毅.应用大地电磁资料识别塔中地区火山岩[J].石油地球物理勘探,2006.
[2]孙卫斌,刘云祥,李德春,何毅.应用大地电磁资料识别塔中地区火山岩[J].石油地球物理勘探,2006.
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