Sedimentary environment and control factors of fine-grained sedimentary rocks in the upper fourth Member of Paleogene Shahejie Formation, Dongying sag

doi:10.7623/syxb201604005

Acta Petrolei Sinica ›› 2016, Vol. 37 ›› Issue (4): 464-473.DOI: 10.7623/syxb201604005

• Petroleum Exploration • Previous Articles Next Articles

Sedimentary environment and control factors of fine-grained sedimentary rocks in the upper fourth Member of Paleogene Shahejie Formation, Dongying sag

Wu Jing^1,2, Jiang Zaixing³, Tong Jinhuan⁴, Yang Lu⁴, Li Ji⁴, Nie Haikuan^1,2

1. Sinopec Exploration & Production Research Institute, Beijing 100083, China;
2. Sinopec Key Laboratory of Shale Gas/Oil Exploration & Production, Beijing 100083, China;
3. Faculty of Energy Resources, China University of Geosciences, Beijing 100083, China;
4. Second Oil Production Plant, PetroChina Qinghai Oilfield Company, Qinghai Haixi 816400, China

Received:2015-09-09 Revised:2016-02-12 Online:2016-04-25 Published:2016-05-06

东营凹陷古近系沙河街组四段上亚段细粒沉积岩沉积环境及控制因素

吴靖^1,2, 姜在兴³, 童金环⁴, 杨璐⁴, 李积⁴, 聂海宽^1,2

1. 中国石油化工股份有限公司石油勘探开发研究院北京 100083;
2. 中国石油化工集团公司页岩油气勘探开发重点实验室北京 100083;
3. 中国地质大学能源学院北京 100083;
4. 中国石油青海油田公司采油二厂青海海西 816400

通讯作者: 吴靖,女,1988年6月生,2010年获中国地质大学(武汉)资源学院学士学位,2015年获中国地质大学(北京)能源学院博士学位,现为中国石油化工股份有限公司石油勘探开发研究院博士后,主要从事沉积学研究。Email:wujing6524982@163.com
作者简介:吴靖,女,1988年6月生,2010年获中国地质大学(武汉)资源学院学士学位,2015年获中国地质大学(北京)能源学院博士学位,现为中国石油化工股份有限公司石油勘探开发研究院博士后,主要从事沉积学研究。Email:wujing6524982@163.com
基金资助:
国家自然科学基金项目(No.41202103)和中国石油化工股份有限公司科技攻关项目(G5800-13-25-KJB005)资助。

Abstract

Abstract:

To explore the sedimentary environment and control factors of fine-grained sedimentary rocks (FGSR) is beneficial to grasp the characteristics and distribution of mud shale reservoirs from the origin, thus more effectively guiding the exploration of unconventional hydrocarbons. Based on well cores, thin sections, X-ray diffraction and geochemical analysis, it is found that among the sedimentary environment elements of fine-grained sedimentary rocks in the upper fourth Member of Dongying sag, climate, water depth and reducibility have four stages of change, showing an overall cyclicity. In the second stage, the salinity was gradually reduced from the abnormally high value as influenced by transgression. The major factors controlling the development of FGSR include provenance, climate, water physical-chemical conditions, tectonism and emergencies. The parent rocks in the study area are consisted of metamorphic rocks, sedimentary rocks (carbonate rocks, quartz sandstones and etc.) and igneous rocks, providing clay minerals, carbonates and silts as the material basis for FGSR after weathering. The cyclicity of climate and water physical-chemical conditions leads to vertical regular changes in FGSR. Tectonism exerts certain influences on the distribution of FGSR though controlling the sedimentary facies. Meanwhile, the development of FGSR is influenced by emergencies (turbidity current and etc.).

Key words: fine-grained sedimentary rocks, sedimentary environment, control factors, Dongying sag, the upper fourth Member of Shahejie Formation

摘要：

探究细粒沉积岩沉积环境及其控制因素有助于从成因上把握泥页岩储层的特征与分布,从而更有效指导非常规油气勘探。岩心观察、薄片分析、X-射线衍射实验及地球化学分析发现,东营凹陷沙河街组四段上亚段细粒沉积岩沉积环境要素中,气候、水深及还原性变化由4个阶段组成且整体呈现旋回性。其中第2个阶段受海侵影响,盐度从异常高值逐渐降低。细粒沉积岩发育的主控因素包括物源、气候、水体物理化学条件、构造作用及突发事件等:研究区母岩包括变质岩、沉积岩(碳酸盐岩与石英砂岩等)及火成岩,经风化提供黏土、碳酸盐及粉砂作为细粒沉积岩的物质基础;气候及水体物理化学条件的旋回性导致了细粒沉积岩垂向上的规律变化;构造作用通过控制沉积相而影响细粒沉积岩的展布;突发事件(浊流等)亦影响细粒沉积岩的发育。

关键词: 细粒沉积岩, 沉积环境, 控制因素, 东营凹陷, 沙河街组四段上亚段

CLC Number:

TE121.3

Wu Jing, Jiang Zaixing, Tong Jinhuan, Yang Lu, Li Ji, Nie Haikuan. Sedimentary environment and control factors of fine-grained sedimentary rocks in the upper fourth Member of Paleogene Shahejie Formation, Dongying sag[J]. Acta Petrolei Sinica, 2016, 37(4): 464-473.

吴靖, 姜在兴, 童金环, 杨璐, 李积, 聂海宽. 东营凹陷古近系沙河街组四段上亚段细粒沉积岩沉积环境及控制因素[J]. 石油学报, 2016, 37(4): 464-473.

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Sedimentary environment and control factors of fine-grained sedimentary rocks in the upper fourth Member of Paleogene Shahejie Formation, Dongying sag

东营凹陷古近系沙河街组四段上亚段细粒沉积岩沉积环境及控制因素

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