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引用本文:白静,徐兴友,陈珊,刘卫彬,刘畅,张昌盛. 松辽盆地长岭凹陷乾安地区青山口组一段沉积相特征与古环境恢复——以吉页油1井为例[J]. 中国地质, 2020, 47(1): 220-235.
BAI Jing,XU Xingyou,CHEN Shan,LIU Weibin,LIU Chang,ZHANG Changsheng. Sedimentary characteristics and paleo-environment restoration of the first member of Qingshankou Formation in Qian'an area, Changling sag, Songliao Basin: A case study of Jiyeyou 1 Well[J]. Geology in China, 2020, 47(1): 220-235(in Chinese with English abstract).
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松辽盆地长岭凹陷乾安地区青山口组一段沉积相特征与古环境恢复——以吉页油1井为例
白静1,2, 徐兴友1, 陈珊1, 刘卫彬1, 刘畅1, 张昌盛3
1.中国地质调查局油气资源调查中心, 北京 100083;2.中国石油天然气股份公司石油勘探开发研究院, 北京 100083;3.中国石油天然气股份公司吉林油田分公司勘探开发研究院, 吉林 松原 138000
摘要:
松辽盆地上白垩统青山口组一段富有机质泥页岩岩发育,层系内部滞留烃富集,具有可观的页岩油资源潜力。沉积古环境控制了泥页岩的分布、有机质发育特征及滞留烃富集程度。因此,恢复青一段泥页岩沉积古环境,明确沉积特征,对揭示青一段泥页岩中页岩油富集规律具有重要意义。本文基于长岭凹陷乾安地区青一段取心井——吉页油1井的岩心观察及测井曲线组合特征,划分了青一段泥页岩沉积微相,应用自然伽马能谱测井、岩性扫描测井数据,选取环境评价参数,对青一段沉积古环境及其演化过程进行了恢复,分析了古环境参数与泥页岩中滞留烃含量的相关性。结果表明:松辽盆地长岭凹陷乾安地区青一段泥页岩是在三角洲外前缘-浅湖-半深湖-深湖沉积体系中形成的,主要发育半深湖-深湖泥、浅湖泥沉积微相。青一段泥页岩沉积古环境经历了水深由浅变深,气候由半潮湿到潮湿,水体由淡水-微咸水,还原性由弱到强,水动力条件由中等到弱的演化,在青一段地层中存在明显的沉积环境变化界面,上下层段沉积环境不同。青一段泥页岩中滞留烃含量主要受沉积古气候、古氧化还原条件控制,潮湿气候还原条件下形成的泥页岩有机质类型好,以腐泥质为主,生油能力强,滞留烃含量高。
关键词:  页岩油  长岭凹陷  青一段  泥页岩  沉积相  古环境恢复  油气勘查工程  松辽盆地
DOI:10.12029/gc20200118
分类号:P618.13
基金项目:中国地质调查局项目(DD20160202、DD20190115)资助。
Sedimentary characteristics and paleo-environment restoration of the first member of Qingshankou Formation in Qian'an area, Changling sag, Songliao Basin: A case study of Jiyeyou 1 Well
BAI Jing1,2, XU Xingyou1, CHEN Shan1, LIU Weibin1, LIU Chang1, ZHANG Changsheng3
1.Oil & Gas Survey, China Geological Survey, Beijing 100083, China;2.Research Institute of Petroleum Exploration and Development, CNPC, Beijing 100083, China;3.Research Institute of Petroleum Exploration and Development, CNPC Jilin Branch, Songyuan 13800, Jilin, China
Abstract:
The first member of Upper Cretaceous Qingshankou Formation (K2qn1) in Songliao Basin has considerable shale oil resource potential because of the wide development of dark mudstone and high residual hydrocarbons. The paleo-sedimentary environment directly controls the dark mudstone distribution, organic matter development, and residual hydrocarbon content. Therefore, analyzing the sedimentary features and restoring the paleo-environment of K2qn1 are of great significance for revealing the regularity of shale oil enrichment. Based on the core observation and logging data of well Jishanyou 1 in Qian'an area of Changling Sag, the authors analyzed the sedimentary characteristics of K2qn1. According to the element data obtained by natural gamma ray spectrometry logging and lithologic scanning logging, the evolution of the paleo-environment of K2qn1 was restored by using suitable parameters. Furthermore, the correlation of paleo-environment parameters and residual hydrocarbon content in mudstone shale was also studied. The results show that the dark mudstone of K2qn1 in the study area was developed in the outer Delta front to shallow lake-semi-deep lake sedimentary system. The palaeo-environment of K2qn1 underwent a change of water depth from shallow to deep, climate from semi-humid to humid, salinity from fresh to brackish, reduction conditions from weak to strong, and sedimentary hydrodynamics from moderate to weak. There is an obvious interface of sedimentary environment within K2qn1. The content of residual hydrocarbon in the mudstone is mainly controlled by paleo-climate and paleo-reduction conditions. The oil-bearing organic matter was formed in a wet and reducing environment, with strong oil-generating capability and high content of residual hydrocarbon.
Key words:  shale oil  Changling Sag  Qingshankou Formation  mudstone  sedimentary facies  paleo-enviroment restoration  oilgas exploration engineering  Songliao Basin