松辽盆地古龙凹陷青山口组页岩层系岩相类型及旋回模式  

Lithofacies types and cycle patterns of shale layers of Qingshankou Formation in Gulong Sag,Songliao Basin

作　　者：林铁锋[1,2] 付秀丽 艾鑫[2,3] 白云风 LIN Tiefeng;FU Xiuli;AI Xin;BAI Yunfeng(Exploration and Development Research Institute of Daqing Oilfield Co.,Ltd.,Daqing 163712,Heilongjiang,China;National Key Laboratory for Multi-resources Collaborative Green Production of Continental Shale Oil,Daqing 163712,Heilongjiang,China;Daqing Oilfield Co.,Ltd.,PetroChina,Daqing 163002,Heilongjiang,China)

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [2]多资源协同陆相页岩油绿色开采全国重点实验室,黑龙江大庆163712 [3]中国石油大庆油田有限责任公司,黑龙江大庆163002

出　　处：《世界地质》2024年第3期378-389,共12页World Geology

基　　金：中国石油股份公司重大科技专项(2023ZZ15)。

摘　　要：综合运用岩心观察、薄片鉴定、地球化学测试及马尔科夫链分析,对古龙凹陷青山口组页岩层系岩相类型及旋回模式进行了探讨。按照“有机质丰度-沉积构造-矿物组成-纹层密度-岩性”分类标准,将古龙凹陷青山口组页岩层系划分出7种岩相:高有机质高密度纹层黏土质页岩(A)、高有机质高密度纹层长英质页岩(B)、中有机质低密度纹层长英质页岩(C)、低有机质低密度纹层长英质页岩(D)、低有机质层状粉砂岩(E)、低有机质层状介屑灰岩(F)和低有机质层状白云岩(G)。依据岩相组合模式及其展布特征,划分为3种旋回模式:①静水旋回模式(A-B-C-A),主要发育在高水位体系域;②浊流旋回模式(A-B-C/D/E-A),主要发育于水进体系域和水退体系域;③白云岩旋回模式(A-B-C-D/G-A),在水进、高水位和水退体系域均有发育。古龙凹陷西侧主要发育浊流旋回,中央主要发育静水旋回,东侧三肇凹陷主要发育静水-白云岩旋回。旋回模式的分布主要受物源、古气候和古盐度的影响。Based on core observation,thin section identification,geochemical test and Markov chain analysis,the lithofacies types and cycle patterns of shale layers of Qingshankou Formation in Gulong Sag are discussed.According to the classification standard of“organic matter abundance--sedimentary structure--mineral composition--lamination density--lithology”,the shale layers of Qingshankou Formation in Gulong Sag are divided into 7 lithofacies,including high TOC-high density laminae-clay shales(A),high TOC-high density laminae-felsic shales(B),medium TOC-low density laminae-felsic shales(C),low TOC-low density laminae-felsic shales(D),low TOC--layered--siltstones(E),low TOC--layered--[JP2]ostracoid limestonse(F)and low TOC--layered--dolomites(G).Based on lithofacies combination patterns and their distribution characteristics,three cycle patterns are divided:①the static water cycle pattern(A-B-C-A)is mainly developed in the highstand system tract;②the turbidite cycle pattern(A-B-C/D/E/F-A)is mainly developed in the transgressive system tract and the regressive system tract;③the dolomite cycle pattern(A-B-C-D/G-A)is developed in all three system tracts.The west of Gulong Sag mainly developed turbidite cycle,the center of Gulong Sag mainly developed static water cycle,and the Sanzhao Sag on east side mainly developed static water-dolomite cycle.The distribution of cycle models is mainly affected by provenance,paleoclimate and paleosalinity.

关 键 词：页岩层系 岩相 旋回模式 青山口组 古龙凹陷 

分 类 号：P618.13[天文地球—矿床学]