鄂西宜昌地区秭地1井陡山沱组古沉积环境演化特征

doi:10.3969/j.issn.1006-6535.2023.06.010

特种油气藏 ›› 2023, Vol. 30 ›› Issue (6): 72-81.DOI: 10.3969/j.issn.1006-6535.2023.06.010

鄂西宜昌地区秭地1井陡山沱组古沉积环境演化特征

徐海¹, 周向辉², 林俊峰¹, 许露露², 刘早学²

1.河南理工大学,河南焦作 454000;
2.湖北省地质调查院,湖北武汉 430034

收稿日期:2022-12-15 修回日期:2023-09-10 出版日期:2023-12-25 发布日期:2024-01-19
通讯作者: 周向辉(1974—),男,高级工程师,1996年毕业于中国地质大学(武汉)岩矿地球化学专业,2008年毕业于该校构造地质专业,获硕士学位,现从事页岩气调查研究工作。
作者简介:徐海(1997—),男,2021年毕业于河南理工大学工业工程专业,现为该校资源与环境专业在读硕士研究生,研究方向为页岩储层及古环境特征研究。
基金资助:
“构造与油气资源”教育部重点实验室课题“鄂西黄陵背斜南缘陡山沱组页岩岩相类型及其与古环境相关性研究”(TPR-2021-06);湖北省地质局科技项目“鄂西黄陵背斜东南缘陡山沱组地球化学特征及有机质富集成因研究”(KJ2021-45);2022年湖北省自然科学基金计划一般面上项目“鄂西地区陡山沱组烃源岩差异沉积演化特征研究”(2022CFB420)

Characteristics of Paleo-sedimentary Environment Evolution of Doushantuo Formation in Well Zidi 1 of Yichang Area in West Hubei of China

Xu Hai¹, Zhou Xianghui², Lin Junfeng¹, Xu Lulu², Liu Zaoxue²

1. Henan Polytechnic University, Jiaozuo, Henan 454000, China;
2. Hubei Geological Survey, Wuhan, Hubei 430034, China

Received:2022-12-15 Revised:2023-09-10 Online:2023-12-25 Published:2024-01-19

摘要/Abstract

摘要： 陡山沱组为鄂西地区重要的页岩气勘探目的层之一,针对该地层古环境研究较为薄弱的现状,通过采集岩心样品进行TOC、主量元素和微量元素测试,分析了鄂西宜昌地区陡山沱组古环境演化规律,明确了陡山沱组页岩气富集有利层段。研究表明:陡一段和陡三段为贫有机质地层,陡二段和陡四段为富有机质地层,其中,陡二段显著富集Ca、Mg、P、Ba、Sr、Zn、U、Mo、Cu,陡四段显著富集Ca、Si、P、Mo、U、Ba、V。陡一段和陡三段气候干燥,盐度较高,主要为氧化环境,古生产力较低;陡二段为温湿与干热气候交替,盐度较高,氧化与贫氧频繁交替;陡四段为温湿气候,盐度较低,为缺氧环境。陡山沱组古水动力较弱,沉积于强滞留盆地,陡二段和陡四段古生产力较高。有利区块位于宜昌市以西的深水台间盆地,陡二段中部为页岩气富集有利层段,其中,TOC＞2.00%的富有机质地层厚度超过20 m,沉积于贫氧—缺氧环境,古生产力相对最高,为陡山沱组页岩气勘探地质“甜点”。研究成果可为鄂西地区陡山沱组页岩气勘探提供地球化学依据。

关键词: 古环境, 地球化学, 沉积演化, 陡山沱组, 鄂西地区

Abstract: Doushantuo Formation is one of the important shale gas exploration target formations in the west Hubei of China. In view of the weak research on the paleo-environment of this formation, the paleo-environmental evolution law of the Doushantuo Formation in the Yichang Area of the west Hubei was analyzed through the collection of core samples for the testing of TOC, major elements and trace elements, and the favourable formations for the enrichment of the Doushantuo Formation were clarified. The study shows that the Member 1 and Member 3 of Doushantuo Formation are of organic-lean strata, and the Member 2 and Member 4 are of organic-rich strata, in which the Member 2 is significantly enriched in Ca, Mg, P, Ba, Sr, Zn, U, Mo, and Cu, and the Member 4 is significantly enriched in Ca, Si, P, Mo, U, Ba, and V. Member 1 and Member 3 have dry climate, high salinity, mainly oxidizing environment, and low paleoproductivity; the Member 2 has alternating warm-wet and dry-hot climate, high salinity, and frequent alternation between oxidizing and oxygen-poor environment; and the Member 4 has warm-wet climate, low salinity, and oxygen-deficient environment. Doushantuo Formation has weak paleohydraulic forces which was deposited in a strong euxinic basin, and Member 2 and Member 4 have higher paleoproductivity. Favorable block is located in the deep-water inter-platform basin at the west of Yichang City, the middle of Member 2 is a shale gas-rich favorable formation, in which the thickness of organic-rich strata with TOC>2.00% is more than 20 m, deposited in an oxygen-poor and oxygen-deficient environment, with the highest paleoproductivity, and it is the geological "sweet spot" of Doushantuo Formation shale gas exploration. The study results provide geochemical basis for the shale gas exploration of Doushantuo Formation in west Hubei of China.

Key words: paleo-environment, geochemistry, sedimentary evolution, Doushantuo Formation, west Hubei of China

中图分类号:

TE121

徐海, 周向辉, 林俊峰, 许露露, 刘早学. 鄂西宜昌地区秭地1井陡山沱组古沉积环境演化特征[J]. 特种油气藏, 2023, 30(6): 72-81.

Xu Hai, Zhou Xianghui, Lin Junfeng, Xu Lulu, Liu Zaoxue. Characteristics of Paleo-sedimentary Environment Evolution of Doushantuo Formation in Well Zidi 1 of Yichang Area in West Hubei of China[J]. Special Oil & Gas Reservoirs, 2023, 30(6): 72-81.

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鄂西宜昌地区秭地1井陡山沱组古沉积环境演化特征

Characteristics of Paleo-sedimentary Environment Evolution of Doushantuo Formation in Well Zidi 1 of Yichang Area in West Hubei of China

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