碳酸盐岩盖层突破压力的影响因素分析

张璐; 国建英; 林潼; 谢增业; 杨春龙; 董才源; 郭泽清; 郝爱胜

doi:10.11781/sysydz202103461

碳酸盐岩盖层突破压力的影响因素分析

doi: 10.11781/sysydz202103461

张璐^{1, 2,},
国建英^{1, 2},
林潼¹,
谢增业^{1, 2},
杨春龙^{1, 2},
董才源^{1, 2},
郭泽清^{1, 2},
郝爱胜^{1, 2}

1.
中国石油勘探开发研究院, 北京 100083
2.
中国石油天然气集团有限公司天然气成藏与开发重点实验室, 河北廊坊 065007

基金项目:

国家科技重大专项 2016ZX05007-003

中国石油股份公司科技项目 2019B-0605

详细信息

作者简介:
张璐(1988-), 女, 工程师, 从事天然气成藏研究。E-mail: zhanglu812@petrochina.com.cn

中图分类号: TE122.25
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- 文章访问数: 711
- HTML全文浏览量: 143
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- 被引次数: 0
出版历程
- 收稿日期: 2020-05-28
- 修回日期: 2021-03-22
- 刊出日期: 2021-05-28

Influencing factors for breakthrough pressure of carbonate caprocks

ZHANG Lu^{1, 2
,},
GUO Jianying^{1, 2},
LIN Tong¹,
XIE Zengye^{1, 2},
YANG Chunlong^{1, 2},
DONG Caiyuan^{1, 2},
GUO Zeqing^{1, 2},
HAO Aisheng^{1, 2}

1.
PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
2.
CNPC Key Laboratory of Gas Reservoir Formation and Development, Langfang, Hebei 065007, China

摘要

摘要: 除传统的膏盐岩和泥页岩外，较多研究证实碳酸盐岩也可作为油气封盖层。突破压力是盖层封闭能力评价的特征参数，通过对塔里木盆地不同岩性类型、不同样品长度的碳酸盐岩在不同温度下进行突破压力测定实验，分析岩石特征、温度、样品长度对实验结果的影响。岩性、渗透率及裂缝发育情况对结果影响明显；相同温度下，样品长度跟突破压力结果没有较好的相关性；不同温度下，大部分样品随温度的升高突破压力逐渐降低。因此在盖层评价中地温对盖层的封闭能力有着不可忽视的作用，是盖层封闭能力评价需要考虑的关键因素，高地温情况下泥质含量高的碳酸盐岩具有更好的封闭能力。
- 高温 /
- 碳酸盐岩 /
- 突破压力 /
- 影响因素
Abstract: In addition to traditional gypsum salt rocks and shale rocks, many studies have confirmed that carbonate rocks also work as oil and gas seals. Breakthrough pressure is a characteristic parameter for the evaluation of the sealing ability of cap rocks. Different lithology types and lengths of carbonate rocks were subjected to breakthrough pressure measurement experiments at different temperatures, results showed that lithology, permeability and fracture development have obvious effects to rock characteristics. At the same temperature, sample length does not have a good correlation with breakthrough pressure, however, at different temperatures, the breakthrough pressure of most samples gradually decreases with the increase of temperature. Therefore, formation temperature has a non-negligible effect on the sealing ability of cap rocks. It is a key factor that needs to be considered for the evaluation of the sealing capacity of cap rocks. The carbonate rock with a high argillaceous content has better sealing capacity under high geothermal conditions.
- high temperature /
- carbonate rock /
- breakthrough pressure /
- influencing factors

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图 1 塔里木盆地寒武系—奥陶系碳酸盐岩部分实验样品扫描电镜下的显微特征

Figure 1. Micro-scale characteristics of Cambrian-Ordovician carbonate samples in Tarim Basin under scanning electron microscope (SEM)

下载: 全尺寸图片幻灯片

图 2 塔里木盆地不同岩性碳酸盐岩平均突破压力

Figure 2. Average breakthrough pressure of carbonate rocks in Tarim Basin with different lithologies

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图 3 塔里木盆地碳酸盐岩孔隙度、渗透率与突破压力的关系

Figure 3. Correlation between porosity, permeability and breakthrough pressure of carbonate rocks in Tarim Basin

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图 4 塔里木盆地寒武系—奥陶系泥晶灰岩裂缝特征

Figure 4. Fracture characteristics of Cambrian-Ordovician micrite limestones in Tarim Basin

下载: 全尺寸图片幻灯片

图 5 20 MPa下温度对界面张力的影响

数据引自文献[21]。

Figure 5. Effect of temperature on interfacial tension at the pressure of 20 MPa

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图 6 塔里木盆地不同碳酸盐岩类突破压力随温度变化关系

Figure 6. Correlation between breakthrough pressure and temperature for different carbonate rocks in Tarim Basin

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图 7 不同岩性突破压力随温度变化关系

泥岩数据引自文献[22]。

Figure 7. Correlation between breakthrough pressure and temperature for different lithologies

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图 8 塔里木盆地不同碳酸盐岩样品恒压条件下样品的长度与突破时间的关系

Figure 8. Correlation between length and breakthrough time of different carbonate rocks in Tarim Basin under constant pressure

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表 1 塔里木盆地寒武系—奥陶系碳酸盐岩部分盖层样品基本参数

Table 1. Basic parameters of Cambrian-Ordovician carbonate samples in Tarim Basin

样品序号	层位		岩性	孔隙度/ %	渗透率/ 10^-3 μm²	直径/ mm	岩石密度/ (g·cm^-3)
样品序号	系	组	岩性	孔隙度/ %	渗透率/ 10^-3 μm²	直径/ mm	岩石密度/ (g·cm^-3)
A1	奥陶系	吐木休克组	亮晶藻砂屑灰岩	0.37	0.042 3	24.87
A2	奥陶系	吐木休克组	泥晶生屑灰岩	0.02	0.000 8	24.87
A3	奥陶系	吐木休克组	亮晶藻砂屑灰岩	2.70	0.021 6		2.63
A4	奥陶系	一间房组	泥晶颗粒灰岩	0.29	0.000 8	24.87
A5	奥陶系	一间房组	泥晶灰岩	1.15	0.007 7		2.68
A6	奥陶系	一间房组	颗粒灰岩	2.51	0.015 4		2.63
A7	奥陶系	鹰山组	亮晶砂屑灰岩	0.39	0.015 7	24.85
A8	奥陶系	鹰山组	粉细晶含灰云岩	0.61	0.002 8	24.87
A9	寒武系	下丘里塔格组	泥粉晶白云岩	6.03	0.017 4	25.20	2.67
A10	寒武系	阿瓦塔格组	膏质云岩	1.26	0.009 5	24.89
A11	寒武系	阿瓦塔格组	泥晶白云岩	19.31	0.684 0	25.30	2.29
A12	寒武系	沙伊里克组	含泥膏质云岩	0.39	0.003 6	24.75
A13	寒武系	吾松格尔组	致密云岩	2.74	0.009 4	25.30	2.76

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表 2 塔里木盆地不同碳酸盐岩样品矿物组成

Table 2. Mineral compositions of different types of carbonate rocks in Tarim Basin

样品序号	岩性	矿物组分/%
样品序号	岩性	方解石	白云石	泥质	硅质	黄铁矿	硬石膏	石英
C1	泥晶生屑灰岩	83.9	1.5	9.6				5
C2	亮晶藻砂屑灰岩	99		1
C3	泥晶颗粒灰岩	97		3	< 1	< 1
C4	亮晶砂屑灰岩	89	6.0	5
C5	粉细晶含灰云岩	14.3	85.7
C6	膏质云岩		63.1				27.8	9.1
C7	含泥膏质云岩		52.0	10			38.0

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