开鲁盆地陆东凹陷白垩系九佛堂组上段米兰科维奇旋回及沉积响应特征  

Milankovitch Cycle and Sedimentary Response Characteristics of Upper Member of Cretaceous Jiufotang Formation in Ludong Depression,Kailu Basin

作　　者：原家鹏 张云峰 Yuan Jiapeng;Zhang Yunfeng(Heilongjiang Oil and Gas Reservoir Forming Mechanism and Resource Evaluation Key Laboratory,Daqing 163318,Heilongjiang,China;School of Earth Sciences,Northeast Petroleum University,Daqing 163318,Heilongjiang,China)

机构地区：[1]黑龙江省油气藏形成机理与资源评价重点实验室,黑龙江大庆163318 [2]东北石油大学地球科学学院,黑龙江大庆163318

出　　处：《吉林大学学报(地球科学版)》2025年第2期375-386,共12页Journal of Jilin University:Earth Science Edition

基　　金：国家自然科学基金项目(42172150)。

摘　　要：开鲁盆地陆东凹陷九佛堂组油气资源量巨大,但关于米兰科维奇旋回与沉积规律,尤其是与细粒沉积岩之间的关系研究较少,从而制约了对烃源岩分布的预测。此次研究通过对自然伽马测井数据进行频谱和小波分析,对九佛堂组上段的沉积岩进行米兰科维奇旋回划分,并将当时的沉积环境与所划分的旋回进行对比分析,明确地层沉积响应特征。结果表明:九佛堂组上段共识别出13个Ⅳ级旋回,25个Ⅴ级旋回,66个Ⅵ级旋回。根据九佛堂组上段沉积岩的岩性和长偏心率特征可将其划分为温暖潮湿气候半周期和寒冷干燥气候半周期2个沉积环境演化阶段。温暖潮湿气候半周期内,水体的深度较深,导致沉积的细粒沉积岩增多;寒冷干旱气候半周期内,水体的深度较浅,导致沉积的细粒沉积岩减少。温暖潮湿气候时期是烃源岩发育时期,寒冷干旱气候时期是储层发育时期,结合相关地球化学数据可以预测储层和烃源岩的发育部位。The Jiufotang Formation has huge hydrocarbon resources in the Ludong depression of Kailu basin,but there is less research on the relationship between Milankovitch cycle and sedimentation patterns,especially fine-grained sedimentation,which restricts the prediction of source rock distribution.In this study,wavelet and spectrum analyses of natural gamma log data were used to divide the Milankovitch cycle of the Upper Member of the Jiufotang Formation,and the sedimentary environment at that time was compared with the divided cycle to clarify the stratigraphic sedimentary response characteristics.The results show that 13 ClassⅣcycles,25 ClassⅤcycles and 66 ClassⅥcycles can be identified in the Upper Member of Jiufotang Formation.According to the lithology and long eccentricity characteristics of the sedimentary rocks in the Upper Member of Jiufotang Formation,it can be divided into two stages of sedimentary environment evolution:Warm and humid climate half-cycle and cold and dry climate half-cycle.In the warm and humid climate half-cycle,the increasing depth of waterbody benefits the deposition of fine-grained sedimentary rocks.The warm and humid climate period is the period of hydrocarbon source rock development,and the cold and dry climate period is the period of reservoir development.Combining with relevant geochemical data,the development sites of reservoirs and hydrocarbon source rocks can be predicted.

关 键 词：开鲁盆地 陆东凹陷 米兰科维奇旋回 九佛堂组上段 沉积响应 细粒沉积岩 烃源岩 

分 类 号：P62[天文地球—地质矿产勘探] P618.13[天文地球—地质学]