东营凹陷沙河街组四段湖相细粒沉积特征及其控制因素

doi:10.12108/yxyqc.20200501

岩性油气藏 ›› 2020, Vol. 32 ›› Issue (5): 1–12.doi: 10.12108/yxyqc.20200501

• 油气地质 • 下一篇

东营凹陷沙河街组四段湖相细粒沉积特征及其控制因素

彭军, 许天宇, 于乐丹

西南石油大学地球科学与技术学院, 成都 610500

收稿日期:2020-02-27 修回日期:2020-04-08 出版日期:2020-10-01 发布日期:2020-08-08
通讯作者: 许天宇(1996-),男,西南石油大学在读硕士研究生,研究方向为沉积学。Email:15531516085@163.com。 E-mail:15531516085@163.com
作者简介:彭军(1968-),男,博士,教授,博士生导师,主要从事沉积学、储层地质学及层序地层学方面的教学和研究工作。地址:(610550)四川省成都市新都区新都大道8号西南石油大学。Email:445371976@qq.com
基金资助:
国家自然科学基金面上项目“湖相泥页岩天文地层周期及高分辨率沉积旋回测井研究”（编号：41872166）资助

Characteristics and controlling factors of lacustrine fine-grained Sediments of the fourth member of Shahejie Formation in Dongying Depression

PENG Jun, XU Tianyu, YU Ledan

School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China

Received:2020-02-27 Revised:2020-04-08 Online:2020-10-01 Published:2020-08-08

摘要/Abstract

摘要： 为研究东营凹陷沙河街组四段上亚段的湖相细粒沉积特征及其控制因素，开展了精细岩心描述、薄片鉴定、X射线衍射全岩分析等。结果表明：①研究区细粒沉积岩可划分为15种岩相类型，其中富有机质平直纹层灰质黏土岩、富有机质块状黏土岩、富有机质块状含灰黏土岩、含有机质波状纹层黏土质灰岩和含有机质波状纹层含黏土灰岩等5种岩相类型较为发育。②依据岩石中黄铁矿含量、Ca（/Ca+Fe）、Zr/Al和Sr/Ca在垂向上的变化，将东营凹陷沙四上亚段沉积演化分为4个阶段，即干旱气候阶段、干旱—暖湿气候过渡阶段、暖湿气候阶段和暖湿—干旱气候过渡阶段。③古气候条件控制了岩石类型及特征，干旱气候阶段发育含有机质波状纹层黏土质灰岩；干旱—暖湿气候条件发育富有机质平直纹层灰质黏土岩；暖湿气候条件发育富有机质块状黏土岩；暖湿—干旱气候条件发育富有机质块状黏土岩和灰质黏土岩。该研究成果对细粒沉积岩的油气勘探具有借鉴意义。

关键词: 湖相细粒沉积岩, 岩相类型, 沉积环境, 沙河街组四段, 东营凹陷

Abstract: In order to study the characteristics and controlling factors of lacustrine fine-grained sediments of the fourth member of Shahejie Formation in Dongying Depression,core description,thin section identification and X-ray diffraction whole-rock analysis were carried out. The results show that:(1)The fine-grained sedimentary rocks in the study area can be divided into 15 types of lithofacies,among which five types of litho-facies are relatively developed,including organic-rich flat ruled lime clay rock,organic-rich blocky clay rock,organic-rich blocky lime-containing clay rock,organic-lean corrugated clay limestone,organic-lean corrugated clay-containing limestone.(2)According to the changes of pyrite content, Ca(/Ca+ Fe), Zr/Al, and Sr/Ca ratios in the vertical direction,the sedimentary evolution of the upper submember of the fourth member of Shahejie Formation in Dongying Depression can be divided into four stages:drought stage,drought-warm wet transition stage,warm and wet stage and warm wet-drought transition stage.(3)Palaeoclimate conditions controlled the types and characteristics of rocks. In the drought stage,organic-lean corrugated clay limestone was developed. In the drought-warm wet transition stage,organic-rich flat ruled lime clay rock was developed. In the warm stage,organic-rich blocky clay rock was developed. In the warm wet-drought transition stage,organic-rich blocky clay rock and lime clay rock were developed. The results of this study can be used as a reference for oil and gas exploration of finegrained sedimentary rocks.

Key words: lacustrine fine-grained sedimentary rock, lithofacies type, sedimentary environment, the fourth member of Shahejie Formation, Dongying Depression

中图分类号:

TE122

彭军, 许天宇, 于乐丹. 东营凹陷沙河街组四段湖相细粒沉积特征及其控制因素[J]. 岩性油气藏, 2020, 32(5): 1–12.

PENG Jun, XU Tianyu, YU Ledan. Characteristics and controlling factors of lacustrine fine-grained Sediments of the fourth member of Shahejie Formation in Dongying Depression[J]. Lithologic Reservoirs, 2020, 32(5): 1–12.

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东营凹陷沙河街组四段湖相细粒沉积特征及其控制因素

Characteristics and controlling factors of lacustrine fine-grained Sediments of the fourth member of Shahejie Formation in Dongying Depression

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