纹层状细粒沉积岩特征及主控因素分析——以渤海湾盆地东营凹陷沙四上—沙三下亚段为例

王苗; 陆建林; 左宗鑫; 李浩; 王保华

doi:10.11781/sysydz201804470

纹层状细粒沉积岩特征及主控因素分析——以渤海湾盆地东营凹陷沙四上—沙三下亚段为例

doi: 10.11781/sysydz201804470

中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126

基金项目:

国家科技重大专项（2017ZX05049001-006）和中国石化科技攻关项目（P15094）共同资助。

详细信息

作者简介:
王苗(1985-),女,硕士,工程师,从事层序地层学、应用沉积学研究工作。E-mail:wangmiaowx.syky@sinopec.com。

中图分类号: TE121.3
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出版历程
- 收稿日期: 2017-09-07
- 修回日期: 2018-06-01
- 刊出日期: 2018-07-28

Characteristics and dominating factors of lamellar fine-grained sedimentary rocks: A case study of the upper Es₄ member-lower Es₃ member, Dongying Sag, Bohai Bay Basin

Wuxi Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

摘要

摘要: 针对页岩油选区评价研究的需要，以东营凹陷为例，基于东营凹陷沙四上-沙三下亚段岩心、岩石薄片、钻井和录井资料，开展了纹层状细粒沉积岩特征及主控因素分析。对比现代和古代湖泊纹层状细粒沉积物，总结出东营凹陷细粒沉积岩中发育的5种纹层类型，包括粉砂质纹层、泥质纹层、碳酸盐纹层、富有机质纹层和混合纹层，分析了各纹层的成因及形成环境。将宏观和微观相结合，从物质来源、搬运动力和沉积环境3个因素为出发点考虑，认为构造、气候和物源共同决定纹层的发育特征：（1）从沙四上段到沙三下亚段，纹层状细粒沉积岩发育区自东向西迁移，与构造沉降中心的演化趋势一致，另外，不同的构造单元发育不同的纹层类型，富有机质纹层主要位于开阔湖中的深洼区和内斜坡，粉砂质纹层分布于中央背斜带和南部斜坡带，碳酸盐纹层位于内斜坡区，混合纹层位于中央背斜带和南部斜坡带，泥质纹层分布范围广泛，在以上构造带均发育；（2）干旱的气候条件容易形成碳酸盐纹层，沙四上亚段碳酸盐纹层相对更发育；湿润的气候更容易形成富有机质纹层，在沙四上和沙三下湖扩体系域中，富有机质纹层十分发育；（3）物源对灰质纹层的分布范围具有明显的控制作用。在此基础上，提出了沙三下亚段纹层状岩相的发育模式。
- 纹层状 /
- 细粒沉积岩 /
- 主控因素 /
- 构造 /
- 气候 /
- 物源 /
- 东营凹陷 /
- 渤海湾盆地
Abstract: A case study was made in the Dongying Sag to meet the needs of shale oil zone evaluation.The characteristics and dominating factors of lamellar fine-grained sedimentary rocks from the upper Es₄ member to the lower Es₃ member in the Dongying Sag were studied based on core and cast thin section observations combined with drilling and logging data. By comparing the lamellar fine-grained sedimentary rocks in ancient lakes with those in recent lakes, five types of laminae were identified, including silty, clay, carbonate, organic-rich and mixed ones. The origin and sedimentary environment of each type of laminae was analyzed. The study considered both macroscopic and microscopic features of laminae and the factors of sedimentary source, transport process and depositional environment, and made a conclusion that tectonic movement, climate change and source determined laminar characteristics as follows. (1) From the upper Es₄ member to the lower Es₃ member, the distribution zone of lamellar fine-grained sedimentary rocks migrates from east to west, which is compatible with the evolution tendency of the tectonic subsidence center. Different laminar types developed in different tectonic units. The organic-rich laminae are mainly distributed in the deep depression and the southern slope. The silty laminae occur in the central anticline and the southern slope. The carbonate laminae are distributed in the inner slope. The mixed laminae are found in the central anticline and the southern slope. The clay laminae are distributed widely in all the above mentioned tectonic units. (2) An arid climate led to high lake salinity and carbonate laminae were deposited. So the carbonate laminae are relevant to an arid climate. The organic-rich laminae tend to be deposited in damp climates, which are well-developed in lacustrine transgressive system tracts from the upper Es₄ member to the lower Es₃ member. (3) Provenance has a significant control on limestone laminae distribution. A development mode of lamellar fine-grained sedimentary rocks was proposed.
- lamellar /
- fine-grained sedimentary rock /
- dominating factor /
- tectonic movement /
- climate /
- source,Dongying Sag /
- Bohai Bay Basin /

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