泥页岩有机非均质性评价及其在烃源岩分级评价中的应用——以辽西拗陷中元古界蓟县系为例

石蕾; 宗文明; 孙求实; 李永飞; 陈树旺

doi:10.13686/j.cnki.dzyzy.2022.03.012

泥页岩有机非均质性评价及其在烃源岩分级评价中的应用——以辽西拗陷中元古界蓟县系为例

中国地质调查局沈阳地质调查中心, 辽宁沈阳 110034

基金项目:
国家自然科学基金"松辽盆地及邻区早白垩世陆相地层高精度年代格架"(41790451);中国地质调查局项目"东北地区重要盆地多能源资源地质调查"(DD20221664)

详细信息

作者简介: 石蕾(1987-), 女, 硕士, 工程师, 从事油气地质与砂岩型铀矿方面的研究, 通信地址辽宁省沈阳市皇姑区黄河北大街280号, E-mail//shih1101@163.com

通讯作者: 宗文明(1983-), 男, 硕士, 高级工程师, 从事油气基础地质调查研究, 通信地址辽宁省沈阳市皇姑区黄河北大街280号, E-mail//252973823@qq.com

中图分类号: P618.13

收稿日期: 2021-10-29

修回日期: 2021-12-29

刊出日期: 2022-06-25

SHALE ORGANIC HETEROGENEITY EVALUATION METHOD AND ITS APPLICATION IN SOURCE ROCKS GRADING EVALUATION: A Case Study of Mesoproterozoic Jixianianin in Liaoxi Depression

Shenyang Center of China Geological Survey, Shenyang 110034, China

More Information

Corresponding author: ZONG Wen-ming, 252973823@qq.com

Received Date: 29 October 2021

Revised Date: 29 December 2021

Publish Date: 25 June 2022

摘要

摘要:
泥页岩有机质丰度存在较强的有机非均质性，利用有限的测试样品难以表征整套烃源岩层的生烃潜力.以辽西拗陷辽凌地2井为研究对象，对蓟县系主要烃源岩层铁岭组与洪水庄组进行剖析，在有机质地球化学特征研究的基础上，利用烃源岩层的测井响应特征，采用变系数ΔlogR技术刻画该井烃源岩TOC，进而实现烃源岩分级评价，得到不同丰度级别烃源岩的空间分布特征.结果表明，洪水庄组烃源岩有机质丰度一般在2%以上，明显高于铁岭组，有机质类型都以Ⅱ型为主并含少量Ⅰ型干酪根，烃源岩都处于生气高峰期的过成熟阶段，应为蓟县系主力烃源岩层.
- 烃源岩 /
- 变系数ΔlogR /
- 铁岭组 /
- 洪水庄组 /
- 蓟县系 /
- 辽西拗陷
Abstract:
It is difficult to characterize hydrocarbon potential of the whole source rock layer with limited test samples due to the strong heterogeneity in organic matter abundance(TOC) of shale. Taking LLD2 well in Liaoxi Depression as the research object, the paper analyzes the main source rocks of Tieling Formation (Jxt) and Hongshuizhuang Formation(Jxh), and makes the grading evaluation as well as spatial distribution characteristics of source rocks with different abundance grades in terms of TOC through variable coefficient ΔlogR on the basis of organic geochemical study and logging response characteristics of source rocks. The results show that the organic matter abundance of Jxh is generally above 2%, significantly higher than that of Jxt, both dominated by the organic matter type Ⅱ with a little Ⅰ-type kerogen. The source rocks are in the over-mature stage of gas-generation peak period, probably serving as the main Jixianian source rock layer.
- source rock /
- variable coefficient ΔlogR /
- Tieling Formation /
- Hongshuizhuang Formation /
- Jixianian /
- Liaoxi Depression

HTML全文

图 1 燕山地区构造分区及辽凌地2井柱状图(据文献[17])

Figure 1.

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图 2 铁岭组、洪水庄组烃源岩热解参数交会图

Figure 2.

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图 3 铁岭组、洪水庄组烃源岩Ph/nC₁₈与Pr/nC₁₇相关图

Figure 3.

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图 4 铁岭组、洪水庄组烃源岩C₂₇－C₂₈－C₂₉ααα（R）构型甾烷相对质量分数三角图

Figure 4.

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图 5 铁岭组、洪水庄组烃源岩成熟度－深度关系图

Figure 5.

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图 6 铁岭组计算TOC与实测TOC相关关系图

Figure 6.

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图 7 铁岭组幅度差与实测TOC相关关系图

Figure 7.

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图 8 洪水庄组计算TOC与实测TOC相关关系图

Figure 8.

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图 9 洪水庄组幅度差与实测TOC相关关系图

Figure 9.

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图 10 铁岭组、洪水庄组泥页岩测井识别TOC模型结果

Figure 10.

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图 11 辽凌地2井铁岭组、洪水庄组烃源岩分级评价结果

Figure 11.

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表 1 烃源岩分级标准

Table 1. Grading criteria for source rocks

级别	TOC/%	（S₁+S₂）/10^-3
优质烃源岩	＞4	＞20
较好烃源岩	1.5~4	6~20
中等烃源岩	＜1.5	＜6

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表 2 辽凌地2井铁岭组与洪水庄组泥页岩分级评价数据表

Table 2. Grading evaluation data for shales of Tieling and Hongshuizhuang formations in LLD2 well

烃源岩级别	层位	泥页岩厚度/m	TOC/%	最大连续厚度/m	泥页岩累计厚度/m	占比/%
优质源岩	Jxt	70.2	＞4.0	0	0	0
优质源岩	Jxh	78.6		22	32.1	40.84
较好源岩	Jxt	70.2	1.5~4.0	4.5	6.45	9.19
较好源岩	Jxh	78.6		9	33.7	42.88
中等源岩	Jxt	70.2	0.5~1.5	33	63.75	90.81
中等源岩	Jxh	78.6		2.8	12.8	16.28

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