基于米兰柯维奇理论的地层划分新方法

提出了以米兰柯维奇理论为基础的地层划分新方法 ,该方法利用频谱中峰值频率的位置进行旋回识别。定义了岁差和斜率的旋回发育状况函数 ,利用该函数来反映地层中米兰柯维奇旋回的发育程度 ,并据此分析了地层的连续性、判断出沉积间断的位置及进行了地层划分。研究结果表明 ,利用地层中存在的米兰柯维奇旋回可以进行精细地层划分 ,划分结果可进行远距离对比。该方法在大港油田、胜利油田、塔河油田的实际应用中取得了较好的效果 ,具有准确性高、效率高、应用范围广的特点。

A new method for stratigraphic division based on Milankovitch theory

On the basis of the Milankovitch theory, a new method for formation division was proposed. A cycle developing flag function was defined and used to record the development of the precession cycles and obliquity cycles in the formation. The continuity of cycles in the depositional sequence and the positions of depositional breaks can be determined with the cycle developing flag function. Furthermore, the Milankovitch cycles in the frequency spectrum of the formation can be distinguished. According to the cycles developing flag function and the computer program, the depositional interface can be determined, and the formation can be classified automatically. The Milankovitch cycles existing in the strata are the basis of the stratigraphic division. This method has been used in Dagang Oilfield, Shengli Oilfield and Tahe Oilfield, and good results have been achieved. The application proved that this new method has the advantages of high accuracy, high efficiency and wide applicability.