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为油气成烃成藏定量研究,特别为油田剥蚀量的计算,需要建立新生代天文地层年代表。该表的数据是立足于天文学“米氏旋回假说”中地球轨道三要素的周期性和准周期性变化,求出各组(段或亚段)地质年龄。计算方法是选定泌阳凹陷11口井从大仓房组至凤凰镇组的地层分层、测井曲线数据等作频谱分析,寻找响应0.405Myr周期中的最大优势旋回和提出的三个‘基准面’的绝对年龄值。研究和计算的最后成果年龄为:1)大仓房组‘红层’顶/核三4亚段底是以邻近渤海湾盆地东营凹陷沙四下亚段‘红层’顶42.671Ma作为年龄对比和标定,向上计算出核三3亚段底为40.951Ma、核三3～1亚段顶为36.490Ma,核二段的顶为34.845Ma;2)廖庄组底/核一段之间是以邻近渤海湾盆地东营凹陷东营组底32Ma计算的数据作对比和标定,向下计算出核一段底的年龄为34.468Ma,核二段/核一段之间可能为一个大约时长为0.4Myr的小剥蚀面;向上计算廖庄组现有顶平均年龄为26.811Ma,即泌阳凹陷廖庄组全沉积的顶在中新世23.03Ma,地质构造上升和沉积回剥时间平均为3.781Myr;3)平原组底界的年龄标定为目前“国际地层表”(2004)中年龄为2.588Ma,向下计算出凤凰镇组底界平均年龄为4.155Ma。
For the quantitative study of hydrocarbon accumulation and hydrocarbon accumulation, especially for the calculation of oil field denudation, we need to establish the Cenozoic astronomical formation age table. The data in this table are based on the periodic and quasi-periodic changes of the three elements of the Earth’s orbit in astronomy “Mie ’s gyration hypothesis ”, and the geological ages of each group (section or sub-section) are obtained. The calculation method is to select stratigraphic stratigraphy and well log data of the 11 wells in the Biyang depression from the Dacangfang formation to the Fenghuangzhen formation for spectrum analysis and find the maximum dominant rotation in the 0.405Myr cycle and the proposed three benchmarks Face ’of the absolute value of age. The final results of the study and calculation are as follows: 1) The top / bottom of the 4th member of the top of the “red beds” of the Dacangfang Formation is characterized by the age of 42.671 Ma near the top of the “red beds” in the lower part of the Sha 4 sub-member in the Dongying Sag, Bohai Bay Basin, After the calibration, the bottom of the Nanshan 3 sub-segment is calculated to be 40.951Ma, the top of the Nanshan sub-segment 3 to 1 is 36.490Ma, and the top of the N-2 segment is 34.845Ma. 2) The bottom / For the contrast and calibration of the 32Ma data of Dongying Formation in Dongying Sag, Bohai Bay Basin, the bottom of the first member of the core is calculated to be 34.468Ma. The second member may be a small eroded surface with an approximate length of 0.4Myr ; Upward calculation of the existing top average age of Liaozhuang Formation is 26.811Ma, that is, the top of all sediments of Liaozhuang Formation in Biyang Depression is 23.03Ma, the average time of geological structure rise and deposition back-stripping is 3.781Myr; 3) The age of the bottom boundary is now marked as 2.588Ma in the current International Stratigraphic Table (2004), and the average age of the bottom boundary of the Fenghuangzhen Formation is calculated to be 4.155Ma.