川东南下志留统龙马溪组深层页岩等温吸附特征及地质意义

王强; 穆亚蓬; 陈显; 宋振响; 马中良; 邱岐

doi:10.11781/sysydz202201180

川东南下志留统龙马溪组深层页岩等温吸附特征及地质意义

doi: 10.11781/sysydz202201180

王强^1,,
穆亚蓬^2, ,,
陈显²,
宋振响¹,
马中良¹,
邱岐¹

1.
中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126
2.
河南省有色金属地质矿产局第二地质大队, 郑州 450016

基金项目:

国家自然科学基金 42072156

国家科技重大专项 2017ZX05036

详细信息

作者简介:
王强(1967-), 男, 高级工程师, 从事油气地球化学研究和仪器研发工作。E-mail: wangqiang.syky@sinopec.com

通讯作者:
穆亚蓬(1980-), 女, 高级工程师, 主要从事有色金属地质研究。E-mail: 280793103@qq.com

中图分类号: TE122.1
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- 文章访问数: 315
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- 被引次数: 0
出版历程
- 收稿日期: 2021-08-02
- 修回日期: 2021-12-10
- 刊出日期: 2022-01-28

Characteristics of methane isothermal adsorption of deep shale from Lower Silurian Longmaxi Formation in southeastern Sichuan Basin and its geological significance

1.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China
2.
No.2 Geological Party, Henan Bureau of Geological Survey for Nonferrous Metals, Zhengzhou, Henan 450016, China

摘要

摘要: 目前在四川盆地已实现深层页岩气的勘探突破，然而对深层页岩吸附性能及页岩气赋存状态仍存在一定的争议。为此，开展了川东南涪陵、丁山地区下志留统龙马溪组深层典型页岩样品近地质条件下的高温高压等温吸附实验。实验结果表明，页岩绝对吸附量与过剩吸附量之间存在较大的差别，必须将过剩吸附量校正为绝对吸附量后来评价深层页岩的真实吸附能力。校正后的页岩绝对吸附量随压力的增大呈现“快速上升”、“缓慢上升”和“平稳上升”3个阶段，涪陵及丁山地区深层页岩在110℃、70 MPa条件下绝对吸附量仍可达2.0 m³/t以上，结合深层页岩吸附、游离气比例，深层页岩总含气量可达4.0 m³/t以上，表明深层页岩在高温高压下仍可能具有较好的含气性。深层页岩吸附能力评价可为页岩含气量研究、资源潜力评价和储量评估提供科学依据；针对深层与中浅层页岩游离、吸附气比例的差异，采取针对性的勘探、开采方式可以有效提高页岩气的产能及产气周期。
- 等温吸附 /
- 绝对吸附量 /
- 深层页岩气 /
- 龙马溪组 /
- 下志留统 /
- 川东南
Abstract: Breakthrough of the exploration of deep shale gas in the Sichuan Basin, Southwest China, has been achieved for decades, there are still some controversies about the adsorption performance and occurrence state of shale gas in deep strata. Isothermal adsorption experiments were carried out under high temperature and high pressure with typical shale samples from deep stratum of the Lower Silurian Longmaxi Formation in Fuling and Dingshan areas in the southeastern Sichuan Basin. Results show that there is a big difference between absolute adsorption and excess adsorption, thus, it is proposed that the excess adsorption capacity should be corrected to the absolute adsorption capacity when evaluating the adsorption performance of deep shale gas. After correction, the variation of absolute shale adsorption with pressure appeared to have three stages including "rapid rise", "slow rise" and "steady rise". The absolute adsorption capacity of deep shale samples from Fuling and Dingshan areas is higher than 2.0 m³/t at 110℃ and 70 MPa, and combined with the adsorption and free gas ratios of deep shale, the total gas content is more than 4.0 m³/t, indicating that deep shale may still have good adsorption performance under high temperature and high pressure. The evaluation of deep shale adsorption capacity can provide reliable parameters for the study of shale gas content and the evaluation of resource potential and reserve for shale gas. Considering the difference of ratio of free gas to adsorbed gas between deep shale and shallow-medium shale, different exploration and production methods can be adopted to effectively improve the production capacity and production cycle of shale gas.
- isothermal adsorption /
- absolute adsorption capacity /
- deep shale gas /
- Longmaxi Formation /
- Lower Silurian /
- southeast Sichuan Basin

HTML全文

图 1 四川盆地及周缘下志留统底界埋深及页岩气田分布

修改自文献[8]。

Figure 1. Distribution of shale gas fields and bottom depth of Lower Silurian in Sichuan Basin and its periphery

下载: 全尺寸图片幻灯片

图 2 川东南地区JY7、DY5井下志留统龙马溪组深层页岩样品在不同温度下实测与拟合过剩吸附量

Figure 2. Measured and fitted excess adsorption capacity of deep shale samples from Longmaxi Formation in wells JY7 and DY5 in southeastern Sichuan Basin at different temperatures

下载: 全尺寸图片幻灯片

图 3 川东南JY7井龙马溪组深层页岩样品在不同温度下的拟合过剩吸附量与绝对吸附量

Figure 3. Fitted excess and absolute adsorption capacity of deep shale samples from Longmaxi Formation in well JY7 in southeast Sichuan Basin at different temperatures

下载: 全尺寸图片幻灯片

图 4 川东南DY5井龙马溪组深层页岩样品在不同温度下绝对吸附量与过剩吸附量差值

Figure 4. Differences between absolute and excess adsorption capacity of deep shale samples from Longmaxi Formation in well DY5 in southeast Sichuan Basin at different temperatures

下载: 全尺寸图片幻灯片

图 5 川东南地区JY7、DY5井龙马溪组深层页岩样品在不同温度下拟合绝对吸附量

Figure 5. Fitted absolute adsorption capacity of deep shale samples from Longmaxi Formation in wells JY7 and DY5 in southeastern Sichuan Basin at different temperatures

下载: 全尺寸图片幻灯片

图 6 川东南地区JY7、DY5井龙马溪组深层页岩样品Langmuir体积、Langmuir压力与解吸温度的关系

Figure 6. Relationship between V_L, P_L and temperatures of deep shale samples from Longmaxi Formation in wells JY7 and DY5 in southeastern Sichuan Basin

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图 7 川东南地区JY7、DY5井龙马溪组深层页岩样品在110 ℃条件下绝对吸附量随压力变化关系

Figure 7. Relationship between absolute adsorption capacity and pressure changes of deep shale samples from Longmaxi Formation in wells JY7 and DY5 in southeastern Sichuan Basin at 110 ℃

下载: 全尺寸图片幻灯片

表 1 等温吸附实验样品基本特征参数

Table 1. Basic characteristic parameters of isothermal adsorption experiment samples

取样井	深度/m	层位	ω(TOC)/%	孔隙度/%	矿物组成/%			泥页岩类型
取样井	深度/m	层位	ω(TOC)/%	孔隙度/%	硅质	碳酸盐	黏土	泥页岩类型
JY7	3 551.2	龙马溪组LM4小层	2.74	5.02	35.93	17.44	37.1	混合型
DY5	3 804.1	龙马溪组LM4小层	2.45	2.79	52.70	5.10	42.2	硅质型

下载: 导出CSV

表 2 川东南地区JY7、DY5井龙马溪组深层页岩样品等温吸附参数

Table 2. Isothermal adsorption parameters of deep shale samples from Longmaxi Formation in wells JY7 and DY5 in southeastern Sichuan Basin

样品	解吸温度/ ℃	Langmuir体积(V_L)/ (m³·t^-1)	Langmuir压力(P_L)/ MPa	吸附相密度ρ_a/ (g·cm^-3)
JY7-3551.2	30	1.87	2.54	0.370 16
JY7-3551.2	70	1.56	3.85	0.303 53
JY7-3551.2	110	1.52	7.05	0.237 15
DY5-3804.1	30	2.01	3.88	0.229 67
DY5-3804.1	70	1.71	6.26	0.190 04
DY5-3804.1	110	1.39	8.02	0.174 70

下载: 导出CSV

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