松辽盆地长岭凹陷青山口组水下重力流混合事件层沉积特征及意义  

Sedimentary Characteristics and Significance of the Underwater Gravity Flow Hybrid Event Bed(HEB)in the Qingshankou Formation of the Changling Sag in the Songliao Basin

作　　者：王旭[1] 胡菲[1,2] 邢济麟 刘招君 WANG Xu;HU Fei;XING Jilin;LIU Zhaojun(College of Earth Sciences,Jilin University,Changchun,Jilin 130061;Key Laboratory of Oil Shale and Coexistent Energy Mineral Resources of Jilin Province,Changchun,Jilin 130061;Exploration and Development Research Institute,Jilin Oilfield Company,Songyuan,Jilin 138000;Exploration and Development Research Institute of Northeast Oil&Gas Branch of Sinopec,Changchun,Jilin 130062)

机构地区：[1]吉林大学地球科学学院,吉林长春130061 [2]吉林省油页岩与共生能源矿产重点实验室,吉林长春130061 [3]中国石油股份有限公司吉林油田分公司勘探开发研究院,吉林松原138000 [4]中国石油化工股份有限公司东北油气分公司勘探开发研究院,吉林长春130062

出　　处：《中国煤炭地质》2024年第11期1-9,共9页Coal Geology of China

基　　金：吉林省自然科学基金项目(20230101081JC);中国石油集团公司科研项目(JS2021-W-13-JZ-8-16);吉林大学科技创新研究团队项目(2021TD-05)。

摘　　要：水下重力流沉积具有复杂多变的沉积过程,扮演了将盆地边缘粗碎屑沉积物输送到湖盆中心的重要角色,深刻影响湖盆中心有机质富集、保存及页岩油成藏。通过对松辽盆地长岭凹陷三口不同沉积环境井位中混合事件层(HEB)沉积特征对比和分析,结果显示各种重力流受物源区供给影响明显,湖盆边缘的L1井分布H1和H3的双层结构,L2井则主要发育过渡流体主导的沉积物组合,L3井发育低密度重力流为主的H4和H5沉积组合。低密度重力流形成一系列粉砂级纹层长英质页岩及泥级纹层黏土质页岩互层(H4和H5组合),有效改善了湖盆中心高TOC、差物性的页岩沉积,平均TOC高达2.84%,OSI平均值达到116.79 mg/g,是湖盆中心发育良好的页岩油甜点层。Underwater gravity flow sedimentation has a complex and variable sedimentary process,playing an important role in transporting coarse debris sediments from the edge of the basin to the center of the lake basin,and profoundly affecting the enrichment and preservation of organic matter and shale oil accumulation in the center of the lake basin.This study compares and analyzes the sedimentary characteristics of hybrid event layers(HEB)developed in three different sedimentary environments in the Changling Sag of the Songliao Basin.Research has shown that various gravity flows are significantly influenced by the supply of the source area.The L1 well at the edge of the lake basin has a dual layered structure of H1 and H3,while the L2 well mainly develops sediment combinations dominated by transitional flow,while the L3 well develops low-density gravity flow dominated sediment combinations of H4 and H5.The low-density gravity flow formed a series of interbedded fine-grained felsic shale and mudstone laminated clay shale(H4 and H5 combination),which effectively improved the high TOC and poor physical properties of shale sedimentation in the center of the lake basin.The average TOC reached 2.84%,and the average OSI reached 116.79mg/g,making it a well developed shale oil sweet spot layer in the center of the lake basin.

关 键 词：水下重力流 混合事件层 页岩油 松辽盆地 

分 类 号：P53[天文地球—古生物学与地层学]