鄂尔多斯盆地南缘铜川地区三叠系延长组长7段剖面及其油气地质意义

doi:10.13809/j.cnki.cn32-1825/te.2022.01.020

油气藏评价与开发 ›› 2022, Vol. 12 ›› Issue (1): 233-245.doi: 10.13809/j.cnki.cn32-1825/te.2022.01.020

鄂尔多斯盆地南缘铜川地区三叠系延长组长7段剖面及其油气地质意义

赵俊峰¹(),刘池洋¹,张东东¹,郭懿萱²,齐亚林²,吕奇奇³,张龙^1,⁴,马奂奂^1,⁵

1.西北大学大陆动力学国家重点实验室/地质学系,陕西西安 710069
2.中国石油长庆油田公司勘探开发研究院,陕西西安 710018
3.长江大学地球科学学院,湖北武汉 430100
4.西安石油大学地球科学与工程学院,陕西西安 710065
5.中国石油集团东方地球物理勘探有限责任公司长庆物探处,陕西西安 710200

收稿日期:2021-05-31 发布日期:2022-03-24 出版日期:2022-02-26
作者简介:赵俊峰（1975—）,男,博士,副教授,主要从事盆地分析与沉积学方面的教学、科研工作。地址：陕西省西安市太白北路229号,邮政编码：710069。E-mail： zjf@nwu.edu.cn
基金资助:
国家自然科学基金“坳陷湖盆斜坡生长对砂质沉积物分散样式的指示——以鄂尔多斯盆地为例”(42172123);西北大学地质学系科研团队基金“坳陷湖盆斜坡差异生长的沉积学响应”(DZX-2020-T-3)

Description and its hydrocarbon geological implications of outcrop sections of Triassic Chang-7 Member in southern Ordos Basin

ZHAO Junfeng¹(),LIU Chiyang¹,ZHANG Dongdong¹,GUO Yixuan²,QI Yalin²,LYU Qiqi³,ZHANG Long^1,⁴,MA Huanhuan^1,⁵

1. State Key Laboratory of Continental Dynamics/Department of Geology, Northwest University, Xi’an, Shaanxi 710069, China
2. Exploration and Development Research Institute, Changqing Oilfield Company of PetroChina, Xi’an, Shaanxi 710018, China
3. School of Geoscience, Yangtze University, Wuhan, Hubei 430100, China
4. School of Earth Science and Engineering, Xi’an Shiyou University, Xi’an, Shaanxi 710065, China
5. Changqing Geophysical Prospecting Section, BGP INC., China National Petroleum Corporation, Xi’an, Shaanxi 710200, China

Received:2021-05-31 Online:2022-03-24 Published:2022-02-26

摘要/Abstract

摘要：

三叠系延长组长7段为鄂尔多斯盆地中生界石油的主力烃源岩,也是页岩油勘探与开发的重要对象。长7段沉积期为延长组湖盆鼎盛阶段,沉积了一套厚度100~120 m以泥页岩类为主的细粒碎屑岩建造,可划分为3个亚段,长7₁、长7₂为当前页岩油重点勘探开发层系。为了加深对长7段沉积环境和油气地质特征的理解,在野外剖面实测基础上,结合前人工作,重点对渭北铜川地区衣食村、背阴村、瑶曲、霸王庄、淌泥河长7段典型露头进行了描述,并讨论了中—晚三叠世延长组富烃凹陷形成的地质背景。结果表明,从长7₃到长7₁,湖盆经历了由鼎盛逐渐收缩、湖平面下降的过程,砂岩含量向上部逐渐增多。研究剖面处于延长组湖盆沉积的深水区,长7段沉积类型既有正常深水细粒沉积岩,也发育类型丰富的深水重力流沉积以及异地搬运形成的火山凝灰岩、具有深部流体成因特征的碳酸盐岩结核等。这些重要现象记录了延长组沉积期富烃坳陷形成的特殊地质背景和过程,对理解陆相盆地烃类生成和富集机理、页岩油勘探开发具有重要的启示。

关键词: 露头剖面, 页岩油, 富烃坳陷, 长7段, 延长组, 鄂尔多斯盆地

Abstract:

Chang-7 Member in the Triassic Yanchang Formation served as the most important source rock of oil in the Mesozoic Ordos Basin, and it is also the realistic interval for the exploration and development of shale oil. The Chang-7 Member represents the climax depositional period of the Triassic lake basin. It is composed of a set of fine-grained clastic rocks, including mudstone and oil shale etc. The thickness of the Chang-7 Member is 100~120 m, which can be divided into three sub-members. Among them, the Chang-7₁ and Chang-7₂ sub-members have been proved as the key intervals for exploration and development of shale oil. To deepen the understanding of the sedimentary environment and oil and gas geological characteristics of the Chang-7 Member, measurement of the field sections are combined with the previous work. The well-exposed sections of the Chang-7 Member in Yishicun, Beiyincun, Yaoqu, Bawangzhuang and Tangnihe in Tongchuan area are described in detail. Furthermore, the geological background of the formation of hydrocarbon-rich depression in the middle-late Triassic stages is discussed. Our results show, the lake basin went through gradual shrinkage and declining lake level from Chang-7₃ sub-member to Chang-7₁ sub-member, and the sandstone content gradually increase to the upper part. The study area is located in the deep lake area of the Yanchang Formation deposition. The sedimentary types in the Chang-7 Member include not only normal deep-water fine-grained sedimentary rocks, but also diverse deep-water gravity flow deposits, volcanic tuff, and carbonate rocks which might source from hydrothermal fluid in the deep part. These important phenomena record the special process of the formation of the hydrocarbon-rich depression, and have important implications for understanding the hydrocarbon formation and enrichment mechanism, as well as the exploration and development of shale oil.

Key words: outcrop section, shale oil, hydrocarbon-rich depression, Chang-7 Member, Yangchang Formation, Ordos Basin

中图分类号:

TE121

赵俊峰,刘池洋,张东东等. 鄂尔多斯盆地南缘铜川地区三叠系延长组长7段剖面及其油气地质意义[J]. 油气藏评价与开发, 2022, 12(1): 233-245.

Junfeng ZHAO,Chiyang LIU,Dongdong ZHANG, et al. Description and its hydrocarbon geological implications of outcrop sections of Triassic Chang-7 Member in southern Ordos Basin[J]. Reservoir Evaluation and Development, 2022, 12(1): 233-245.

图/表 11

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鄂尔多斯盆地南缘铜川地区三叠系延长组长7段剖面及其油气地质意义

Description and its hydrocarbon geological implications of outcrop sections of Triassic Chang-7 Member in southern Ordos Basin

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