Palaeoenvironment characteristics and sedimentary model of the lower submember of Member 1 of Shahejie Formation in the southwestern margin of Q ikou sag

doi:10.7623/syxb202008001

Acta Petrolei Sinica ›› 2020, Vol. 41 ›› Issue (8): 903-917.DOI: 10.7623/syxb202008001

• Petroleum Exploration • Next Articles

Palaeoenvironment characteristics and sedimentary model of the lower submember of Member 1 of Shahejie Formation in the southwestern margin of Q ikou sag

Zhou Lihong, Han Guomeng, Ma Jianying, Chen Changwei, Yang Fei, Zhang Lihua, Zhou Kejia, Chen Shuangqing, Yang Fan, Dong Yueqi, Zhou Jing

PetroChina Dagang Oilfield Company, Tianjin 300280, China

Received:2019-09-12 Revised:2020-05-22 Online:2020-08-25 Published:2020-09-01

歧口凹陷西南缘沙河街组一段下亚段古环境特征与沉积模式

周立宏, 韩国猛, 马建英, 陈长伟, 杨飞, 张莉华, 周可佳, 陈双清, 杨帆, 董越崎, 周静

中国石油大港油田公司天津 300280

通讯作者: 周立宏,男,1968年7月生,1993年获长春地质学院矿床学专业学士学位,2005年获中国科学院地质与地球物理研究所博士学位,现为中国石油大港油田公司副总经理、教授级高级工程师,主要从事油气勘探研究与生产管理工作。Email:zhoulh@petrochina.com.cn
作者简介:周立宏,男,1968年7月生,1993年获长春地质学院矿床学专业学士学位,2005年获中国科学院地质与地球物理研究所博士学位,现为中国石油大港油田公司副总经理、教授级高级工程师,主要从事油气勘探研究与生产管理工作。Email:zhoulh@petrochina.com.cn
基金资助:
中国石油天然气股份有限公司科技重大专项"大港油区效益增储稳产关键技术研究与应用"（2018E-11-01）资助。

Abstract

Abstract:

The lower submember of the Member 1 of Shahejie Formation is an important series of shale oil-bearing strata in the Qikou sag. To further understand the sedimentary environment, cycle characteristics and sedimentary model of the fine-grained sedimentary rocks in this member, a comprehensive study of the target horizon is conducted using seismic, logging, mud logging and systematic data. The fine-grained sedimentary rocks in the study area include felsic shale, carbonate shale (dolomite, lime shale and dolomitic shale), clay shale and mixed shale. Mixed shale, felsic shale and carbonate rocks shale account for a relatively high proportion. Overall, this study area has a reduced-strong reduced sedimentary environment, where the salinity is relatively high, which is mainly controlled by terrestrial detrital sedimentation and biochemical sedimentation. A high-salinity zone is formed between the broad bay and the Qikou sag as the main depression. Subject to evaporation in the penecontemporaneous period, the high-density Mg²⁺-rich super-salt water in the shore-shallow lake zone flowed along the lake bottom into lake basin under the action of gravity. The early-formed calcite, was transformed into penecontemporaneous dolomite by dolomitization. The lithological combination is obviously controlled by the cycle. A layer of stable dolomite or dolomitic shale is developed under the turnaround surface of the short-term reverse-positive cycle, the carbonate rock (at the sweet spot) is developed in the falling semi-cycle of the long-term cycle, while clay shale and clay shale (in the interbedded layer) are mainly developed in the rising long-term cycle. On this basis, this paper can further summarize the fine-grained sedimentation model in the supply area of strong-terrestrial-source debris and that of the supply area of weak-terrestrial-source debris.

Key words: Bohai Bay Basin, Qikou sag, lower submember of Member 1 of Shahejie Formation, shale oil, salt lake, sedimentary model

摘要：

沙河街组一段下亚段是歧口凹陷重要的页岩油发育层系，为进一步了解该段细粒沉积岩沉积环境、旋回特征和沉积模式，利用地震、测井、录井和系统取心分析资料对目的层位展开综合研究。研究区细粒沉积岩包括长英质页岩、碳酸盐质页岩（白云岩、灰质页岩、白云质页岩）、黏土质页岩和混合质页岩4种类型，混合质页岩、长英质页岩和碳酸盐质页岩占优势；总体为还原-强还原沉积环境，水体盐度较高，主要受陆源碎屑沉积和生物化学沉积作用控制；宽缓湖湾与歧口主凹之间形成高盐度带，受准同生期蒸发浓缩作用，滨-浅湖带高密度富Mg²⁺超咸水在重力作用下，沿着湖底向湖盆内部流动，早期形成的方解石发生白云石化，形成准同生白云岩；岩性组合受旋回控制作用明显，短期反-正旋回转换面之下位置发育一层稳定白云岩或白云质页岩，碳酸盐岩（甜点段）发育于长期旋回内的下降期半旋回，上升期长期旋回主要发育黏土质混合页岩和黏土质页岩（隔板层），进一步可以总结出强陆源碎屑供给区细粒沉积模式和弱陆源碎屑供给区细粒沉积模式。

关键词: 渤海湾盆地, 歧口凹陷, 沙河街组一段下亚段, 页岩油, 咸湖, 沉积模式

CLC Number:

TE121.3

Zhou Lihong, Han Guomeng, Ma Jianying, Chen Changwei, Yang Fei, Zhang Lihua, Zhou Kejia, Chen Shuangqing, Yang Fan, Dong Yueqi, Zhou Jing. Palaeoenvironment characteristics and sedimentary model of the lower submember of Member 1 of Shahejie Formation in the southwestern margin of Q ikou sag[J]. Acta Petrolei Sinica, 2020, 41(8): 903-917.

周立宏, 韩国猛, 马建英, 陈长伟, 杨飞, 张莉华, 周可佳, 陈双清, 杨帆, 董越崎, 周静. 歧口凹陷西南缘沙河街组一段下亚段古环境特征与沉积模式[J]. 石油学报, 2020, 41(8): 903-917.

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Palaeoenvironment characteristics and sedimentary model of the lower submember of Member 1 of Shahejie Formation in the southwestern margin of Q ikou sag

歧口凹陷西南缘沙河街组一段下亚段古环境特征与沉积模式

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