重力约束反演构建郯庐断裂带泗洪浅覆盖区隐伏基岩地质模型  

Construction of bedrock geological model in shallow overburden area:Application of a joint inversion of gravity anomaly and borehole data in the Tanlu Fault Zone,Sihong area

作　　者：李长波 蒋仁[3] 曾剑威[3] 刘凯[3] 赵玲[3] 于俊杰[3] 彭博[3] 劳金秀[3] 周效华[3] LI Changbo;JIANG Ren;ZENG Jianwei;LIU Kai;ZHAO Ling;YU Junjie;PENG Bo;LAO Jinxiu;ZHOU Xiaohua(Institute of Geophysics and Geomatics,China University of Geosciences(Wuhan),Wuhan 430074,Hubei,China;Graduate School of Chinese Academy of Geological Sciences,Beijing 100037,China;Nanjing Center,China Geological Survey,Nanjing 210016,Jiangsu,China)

机构地区：[1]中国地质大学(武汉)地球物理与空间信息学院,湖北武汉430074 [2]中国地质科学院研究生院,北京100037 [3]中国地质调查局南京地质调查中心,江苏南京210016

出　　处：《地质通报》2022年第2期425-435,共11页Geological Bulletin of China

基　　金：中国地质调查局项目《长江三角洲沪宁杭地区区域地质调查》(编号:DD20190043)。

摘　　要：利用重力异常数据建立覆盖区的基岩地质模型往往需要大量的地质与岩石物性资料,同时受地质先验信息、人为因素等干扰严重。运用重力异常钻孔约束反演的方法尝试构建浅覆盖区基岩地质模型,探讨在人为介入较少的情况下快速高效构建包含基岩面起伏特征、断裂展布、密度分布等要素的地质模型的可行性。在郯庐断裂泗洪地区的地质调查实际应用中,对区内布格重力异常采用小波多尺度分解的方法进行基岩面异常场提取,随后联合运用小波断裂分析、线性回归反演、视密度填图等方法构建了该区域的隐伏基岩地质模型。结果显示,在不需要大量地质先验信息的情况下,该系列方法能够快速高效地构建覆盖区地质模型。结果模型能够较好地反映基岩面构造及物性特征,并且细化郯庐断裂带泗洪地区的区域构造特征,对于郯庐断裂地区的构造演化研究具有一定的参考意义,同时为探索较少人为干预的地球物理数据反演覆盖区隐伏基岩的方法研究提供一定的实践价值。The establishment of the bedrock geological model with gravity anomaly data in the covered area usually requires a lot of geological and rock-physical data.The results are often disturbed by geological prior information and human factors.A joint inversion method of gravity anomaly and borehole data for constructing the geological bedrock model in shallow overburden area was introduced to explore the feasibility of rapidly and efficiently constructing the geological model of bedrock surface undulation,fault distribution and density distribution in the case of less human intervention.In the practical application of the Tanlu Fault Zone,Sihong area,the wavelet multi-scale decomposition method was used to extract the gravity anomaly field of bedrock surface;furthermore,the geological model of bedrock in this region was constructed by means of wavelet fault analysis,linear regression inversion and apparent density mapping.The results show that this method can construct the geological model of overburden area quickly and efficiently without requiring a lot of geological prior information.This model can truthfully reflect the structural and physical characteristics of the bedrock surface,and refine the regional tectonic characteristics of the Tanlu Fault,which is meaningful for the better understanding of the regional tectonic evolution and geophysical data inversion of buried bedrock.

关 键 词：钻孔 重力异常反演 小波多尺度分解 泗洪 地质调查工程 

分 类 号：P631.1[天文地球—地质矿产勘探]