基于米氏旋回的三角洲前缘油层对比研究  

Division and Comparison of Oil Reservoirs in Delta Front from Milankovitch Astronomical Cycles

作　　者：赵军 赵凯[3] 张金宇 ZHAO Jun;ZHAO Kai;ZHANG JinYu(No.10 Oil Production Plant,Daqing Oilfield Company,PetroChina,Daqing,Heilongjiang 163312,China;Exploration and Development Research Institution of Dagang Oilfield Company Ltd,Tianjin 300280,China;Research Institution of Exploration and Development,Daqing Oilfield Company,PetroChina,Daqing,Heilongjiang 163712,China;No.2 Oil Production Plant,Daqing Oilfield Company,PetroChina,Daqing,Heilongjiang 163414,China)

机构地区：[1]中国石油大庆油田有限责任公司第十采油厂,黑龙江大庆163312 [2]中国石油大港油田有限责任公司勘探开发研究院,天津300280 [3]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [4]中国石油大庆油田有限责任公司第二采油厂,黑龙江大庆163414

出　　处：《沉积学报》2022年第3期801-812,共12页Acta Sedimentologica Sinica

基　　金：国家自然科学基金(41790452);国家科技重大专项(2017ZX05001-002-006)。

摘　　要：基于米兰科维奇天文旋回理论在三角洲前缘开展砂岩组和单层级别的油层对比研究,频谱分析和小波变换揭示萨尔图油层Ⅲ油层组存在米兰科维奇天文旋回,可识别出比值接近5∶2∶1的3个旋回厚度,分别对应于偏心率100 ka、斜率40 ka和岁差20 ka周期,推测地层在沉积时受到米兰科维奇天文轨道周期性变化的影响。根据岁差20 ka周期带通滤波(BPF)和堆积速率变化特征,将萨尔图油层Ⅲ油层组划分为9个砂岩组和20个单层。研究表明,岁差20 ka周期调控气候波动的机制与超短期基准面升降变化之间存在着一定的协调作用,利用米兰科维奇天文旋回划分出的单层具有严格的等时性。20个单层砂体的展布特征表明,萨尔图油层Ⅲ油层组经历了多期水进—水退事件,与砂岩组的划分具有较好的对应关系。Sandstone groups and monolayers were studied in terms of Milankovitch astronomical cycles by dividing and contrasting oil reservoirs in a delta front. Spectral analysis and wavelet transforms revealed that the Milankovitch cycles are reflected in the third reservoir of Saertu Formation(SⅢ). An eccentricity period of 100 ka,an obliquity period of 40 ka and a precession period of 20 ka in SⅢ correspond closely to the 5∶2∶1 ratio of cyclic formation thicknesses. Evidently,the astronomical orbital period had an impact on SⅢ. Bandpass filtering indicates a variation of sediment accumulation rate corresponding to the 20 ka precession period. SⅢ comprises nine sandstone groups and 20 monolayers. It is suggested that there is a degree of correspondence between the 20 ka precession cycle that regulated climate fluctuations and super-short-term base-level rises and falls. The monolayers have a strictly isochronous division corresponding to the Milankovitch cycles. The distribution of sand in the 20 monolayers reveals that SⅢ experienced multi-stage transgression and regression,which correspond well with the division of the sandstone groups.

关 键 词：频谱分析 小波变换 米兰科维奇天文旋回 三角洲前缘 油层对比 

分 类 号：P618.13[天文地球—矿床学]