江汉盆地陈沱口凹陷始新统盐湖古环境对富有机质岩相发育的控制

俞映月; 吴世强; 郑有恒; 郭丽彬

doi:10.19509/j.cnki.dzkq.tb20230481

江汉盆地陈沱口凹陷始新统盐湖古环境对富有机质岩相发育的控制

doi: 10.19509/j.cnki.dzkq.tb20230481

1.
中国石油化工股份有限公司江汉油田分公司勘探开发研究院, 武汉 430223
2.
中国石油化工股份有限公司江汉油田分公司, 湖北潜江 433124

基金项目:

中国石油化工股份有限公司项目“东部富油气凹陷及周缘资源评价” P23234

“咸化湖盆碳酸盐岩沉积储层特征研究”

详细信息

通讯作者:
俞映月，E-mail：yuyingyue200@cug.edu.cn

中图分类号: P618. 13
计量
- 文章访问数: 180
- PDF下载量: 101
- 被引次数: 0
出版历程
- 收稿日期: 2023-08-21
- 录用日期: 2024-04-19
- 修回日期: 2024-04-17

Paleoenvironmental controls on organic-rich lithofacies of Eocene saline lacustrine in the Chentuokou Depression, Jianghan Basin

1.
Exploration and Production Research Institute, Jianghan Oilfield Company, SINOPEC, Wuhan 430223, China
2.
Jianghan Oilfield Company, SINOPEC, Qianjiang Hubei 433124, China

More Information

Corresponding author: YU Yingyue, E-mail: yuyingyue200@cug.edu.cn

摘要

摘要:
江汉盆地新沟嘴组下段Ⅱ油组广泛发育页岩与白云岩互层的烃源岩, 近期该层系页岩油勘探获得了重大突破, 但盐湖沉积背景下沉积的膏盐对于孔隙的影响制约了页岩油的勘探开发, 明确低膏盐富有机质岩相发育的控制因素对页岩油勘探具有重要意义。选取陈沱口凹陷的C1系统取心井作为研究对象, 通过岩心及岩石薄片的观察鉴定, 全岩矿物组成质量分数、有机碳及地球化学元素含量测定, 对C1井新沟嘴组下段Ⅱ油组的岩相类型、沉积环境和有机质富集主控因素进行了系统研究, 建立了适合江汉盆地新沟嘴组盐湖相岩相划分方案和沉积模式。结果表明: C1井新沟嘴组下段Ⅱ油组共发育4类7种岩相, 分别为富碳细纹层状白云岩、富碳粗纹层状白云岩、含碳块状白云岩; 富碳细纹层状混合质页岩、富碳粗纹层状混合质页岩; 含碳粗纹层状粉砂岩; 贫碳块状膏盐岩。古气候、古盐度与古氧化还原协同演化控制了岩相发育的多样性, 有机质富集的主控因素为还原性古水介质环境。页岩油勘探有利岩相为富碳(含碳)粗纹层(细纹层)状白云岩(混合质页岩), 有利岩相的沉积环境为咸水、还原的半深湖环境。陈沱口凹陷新沟嘴组下段Ⅱ油组富有机质岩相发育控制因素及其沉积环境的揭露, 可为江汉盆地相关凹陷新沟嘴组页岩油勘探提供借鉴和参考。
- 江汉盆地 /
- 始新统 /
- 盐湖沉积 /
- 富有机质岩相 /
- 古环境 /
- 有机质富集
Abstract: <p>Source rocks characterized by shale-dolomite interbeds were widely developed in oil group Ⅱ, the lower Member of Xingouzui Formation in Jianghan Basin. A breakthrough has been made recently in shale oil exploration of shale-dolomite interbeds, while the presence of gypsum and salt deposites in saline lake on shale porosity restrains the process of shale oil exploration.</p></sec><sec><title>Objective
It is of great significance for shale oil exploration to clarify the controlling factors of the organic-rich shale lithofacies with low content of gypsum and salt.
Methods
Well C1 penetrated stratigraphic unit of the Xingouzui Formationin the Chentuokou Depression, Jianghan Basin was studied. Based on the core and thin section observations and the analyses of whole rock mineral compositions, organic carbon contents (TOC), and geochemical elements, a systematic study on lithofacies, sedimentary environment, and main controlling factors of organic matter accumulation were conducted.
Results
The classification of fine-grained sediments and the saline lacustrine sedimentary model in Jianghan Lake Basin were established. Lithofacies of oil group Ⅱ, the lower Member of Xingouzui Formation Xingouzui Formation in Well C1 can subdivided into seven types: organic-rich laminated dolomite facies, organic-rich layered dolomite facies, organic-contain massive dolomite facies, organic-rich laminated mixed shale facies, organic-rich layered mixed shale facies, organic-contain layered siltstone, and organic-poor massive gypsum-salt rock facies. The co-evolution of paleoclimate, paleosalinity, and paleoredox resulted in the diversity of lithofacies development, and the main controlling factor of organic matter accumulation was the anoxic palaeo-water body. The favorable lithofacies for shale oil exploration are organic-rich/organic-contain laminated/layered dolomite/mixed shale, which deposited in semi-deep lake with brackish water, anoxic condition.
Conclusion
This study reveals the controlling factors for the development of organic-rich lithofacies and its depositional environment of oil group Ⅱ, the lower Member of Xingouzui Formation in the Chentuokou Depression, which can provide valuable insights for shale oil exploration of Xingouzui Formation in related Depression in Jianghan Saline Basin.
- Jianghan Basin /
- Eocene /
- saline lacustrine deposit /
- organic-rich lithofacies /
- paleoenvironment /
- organic matter accumulation
注释:

所有作者声明不存在利益冲突。

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图 1 江汉盆地主要构造及地层框架示意图

Figure 1. Tectonic seeting and stratigraphic framework of Jianghan Basin

下载: 全尺寸图片幻灯片

图 2 江汉盆地细粒沉积岩岩相划分方案示意图

a.沉积岩有机碳质量分数划分；b.沉积岩沉积构造划分；c, d.沉积岩矿物组成三端元分类图

Figure 2. Lithofacies classification of fine-grained saline lacustrine rocks in Jianghan Basin

下载: 全尺寸图片幻灯片

图 3 江汉盆地新沟嘴组盐湖相沉积模式图

Figure 3. Sedimentary model of saline lacustrine sediments of Xingouzui Formation in Jianghan Basin

下载: 全尺寸图片幻灯片

图 4 C1井新下段Ⅱ油组各沉积环境古盐度指标(a)、古气候因子(b)、古氧化还原指标(c)、膏盐量(d)和有机碳含量(e)箱线图

Figure 4. Boxplots of paleosalinity(a), paleoclimate factors(b), anoxia index(c), gypsum salt(d), and organic carbon content(e) in oil group Ⅱ of Lower Member of Xingouzui Formation, Well C1

下载: 全尺寸图片幻灯片

图 5 C1井新下段Ⅱ油组各环境因子与膏盐量相关系数热力图

Figure 5. Heat map of correlation coefficient between environmental factors and gypsum salt content in oil group Ⅱ of Lower Member of Xingouzui Formation, Well C1

下载: 全尺寸图片幻灯片

图 6 C1井新下段Ⅱ油组1小层岩相古环境综合柱状图

Figure 6. Stratigraphic column of lithofacies and paleoenvironment, first layer of oil group Ⅱ of Lower Member of Xingouzui Formation, Well C1

下载: 全尺寸图片幻灯片

图 7 C1井新下段Ⅱ油组各环境因子与有机碳含量相关系数热力图

Figure 7. Heatmap of correlation coefficient between environmental factors and organic carbon content in oil group Ⅱ of Lower Member of Xingouzui Formation, Well C1

下载: 全尺寸图片幻灯片

表 1 江汉盆地盐湖细粒沉积岩岩相划分方案

Table 1. Lithofacies classification criterion of fine-grained rocks in saline lacustrine of Jianghan Basin

划分依据	标准		命名
有机碳质量分数	w(TOC)≤0.5% 0.5% < w(TOC) < 1% w(TOC)≥1%			贫碳含碳富碳
沉积构造	纹层厚度≤1 mm 纹层厚度>1 mm 无纹层状构造			细纹层状粗纹层状块状
矿物成分	w(岩盐+膏类) < 50% (10% < w(岩盐+膏类) < 50%)	碳酸盐矿物、长英质矿物、黏土矿物	含膏盐	碳酸盐岩、长英质碳酸盐岩、泥质碳酸盐岩、粉砂岩、钙质粉砂岩、泥质粉砂岩、黏土质泥(页)岩、长英质泥(页)岩、钙质泥(页)岩、混合质页岩
矿物成分	w(岩盐+膏类) ≥50% (排除后期脉状)	碳酸盐矿物、长英质矿物、黏土矿物		钙质膏盐岩长英质膏盐岩黏土质膏盐岩混合质膏盐岩

下载: 导出CSV

表 2 陈沱口凹陷C1井新下段Ⅱ油组1小层主要岩相类型及特征

Table 2. Main lithofacies and features of oil group Ⅱ of Lower Member of Xingouzui Formation in Well C1, Chentuokou Depression

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