平衡剖面正演模拟技术在松辽盆地构造分析中的应用

Application of Balanced Profile Forward Modelling to the Structual Analysis of Songliao Basin

合理的进行构造解释是油气勘探至关重要的环节．平衡剖面正演模拟可以快速、有效地检验地震解释的正确性，提供合理的解释模型．同时可以动态地显示构造变形历史，为研究油气的形成与演化提供依据．根据剖面要素与构造变形的关系，选择模拟参数为：层面、断层、滑脱面、剥蚀面，平衡剖面的正演过程为：剖面初部解释、正演模拟、剖面比较、剖面详细解释．对松辽盆地实际剖面的模拟表明，盆地裂谷期断陷盆地结构主要受边界主断层滑脱面形态及其深度控制，反转构造受早期断层滑脱面形态控制，利用断弯褶皱模型能够更好的解释大庆长垣的成因．因此在伸展地区构造解释中，要进行滑脱构造的研究，为油气勘探提供可靠的依据．

The interpretation of seismic section is of importance in petroleum exploration.Balanced profile forward modelling can rapdily and effectively examine the hypotheses in seismic interpretation and give a reasonable interpretation model. It can also dynamically demonstrate the deformation history of structures, and provides a basis for the study of the formation and evolution of hydrocarbon. In forward modelling, bed planes, fault planes, slip planes and degradation planes are selected as simulated parameters. The process of forward modelling can be divided into four steps:(1) based on the preliminary interpretation of the reliable data in seismic section, select simulated parameters and establish data for forward modelling. (2) a simulated section is obtained by forward modelling. (3) compare the simulated section with the seismic section, if there is difference between the two sections, modify the parameters and simulate again until the obtained section conforms to the seismic section. (4) interpret in detail the simulated section, and deduce the data in the blank areas of the section. The simulated results of some examples in Songliao Basin show that the structure of the basin in rift period is controlled mainly by the morphology and the depth of boundary fault slip plane, and inversion structure is controlled by the morphology of the early fault slip planes. Fault bend fold model can give a reasonable interpretation to the genesis of Daqing Changyuan structure.