伸展区域平衡剖面法及其在构造分析中的应用  

Structure Restoration of Balancing Cross Section in Extension Area: An Example from the Huaifu Depression, North Jiangsu Basin

作　　者：薛冈[1] 卢华复[1] 朱成宏[2] 包红林[2] 

机构地区：[1]南京大学地球科学系,江苏南京210093 [2]中国石化石油勘探开发研究院南京石油物探研究所,江苏南京210014

出　　处：《高校地质学报》2001年第4期427-434,共8页Geological Journal of China Universities

摘　　要：从伸展构造样式出发 ,针对不同的地质模型提出了不同的数学模型作为平衡剖面恢复实现的基础。“多米诺”骨牌模型采用刚体平移、旋转实现恢复 ;伸展断层转折褶皱模型采用剪切法恢复 ,也有用等岩层长度法作构造恢复。通过淮阜凹陷实际地质剖面的恢复 ,数学模型以正演、反演两种角度便捷的实现构造平衡 ,恢复控凹断层发育期次 ;Based on a review in geometric modes in extensional tectonics,the basic deformation structure models are discussed. In the light of study on the geometric models of hanging wall , several mathematical approaches are presented to balance deformed structure. The square matrix method is applied in simulation of rigid body rotation and shift. The algebra equations of two structural restoration methods are employed in restoration of rollover above listric normal fault. These expressions provide basis for deriving computer algorithms. In this way, the particles of deformed layers in the cross section can be restored to their original positions. It is also feasible in simulation of layer deformation. A computer program was designed for structure analysis, and has been applied in the oil field in the Huaifu Depression,North Jiangsu Basin,East China. Basic structure featuress of this basin was illustrated after the interpreted seismic profile of line Fs1420 was restored , and the tepo tectonics history of sedimentary was also revealed. From the restored cross sections of line Fs1420, it can be seen that fault F0 was apparently the main fault, and controlled the development of Huaifu Depression, North Jiangsu Basin. Fault F2, fault F3 and fault F6 actived in the same extensional tectonic regime with the main fault occurred from the begining of the first stage of Pukou Formation (K 2p 1) in Late Cretaceous to the Cenozoic. Since the reflected surface in seismic section TgO as the base of the Pukou Formation (K 2p) can not be identified clearly, the characteristics of fault F1 was difficult to define. After detailed study, it is infered that it is emplaced in forth stage of Pukou Formation (K 2p 4). The synthetic fault F4 and the antithetic fault F5 were controlled by fault F3 and were emplaced in Cenozoic. Fault F7, a later antithetic fault, was also emplaced in Cenozoic .The total extention of Huaifu Depression was 6280 m since 97Ma and the individual episode extention values and the extentional rate are calculat

关 键 词：构造样式 地质模型 数学模型 平衡剖面恢复 定量分析 伸展构造 

分 类 号：P542[天文地球—构造地质学]