鄂尔多斯盆地东部太原组页岩气吸附特征及影响因素

引用本文

熊荃, 彭渊, 唐友军, 陈天宇, 毛亚辉. 鄂尔多斯盆地东部太原组页岩气吸附特征及影响因素[J].中国地质调查, 2019,6(4): 51-57.
XIONG Quan, PENG Yuan, TANG Youjun, CHEN Tianyu, MAO Yahui. Shale gas adsorption characteristics and influencing factors of Taiyuan Formation in Eastern Ordos Basin[J].Geological Survey of China, 2019,6(4): 51-57. 复制到剪切板

doi: 10.19388/j.zgdzdc.2019.04.07

Permissions

《中国地质调查》编辑部所有

鄂尔多斯盆地东部太原组页岩气吸附特征及影响因素

熊荃¹, 彭渊², 唐友军¹, 陈天宇², 毛亚辉²

1.油气资源与勘探技术教育部重点实验室,长江大学资源与环境学院,武汉 430100

2.自然资源部盐湖资源与环境重点实验室,中国地质科学院矿产资源研究所,北京 100037

通信作者简介: 彭渊(1986—),男,助理研究员,从事构造地质、石油地质方向的研究。Email: cugb_pengyuan@126.com。

第一作者简介: 熊荃(1993—),男,硕士研究生,从事油气地球化学方向的研究。Email: 384280198@qq.com。

收稿日期: 2019-05-01

基金资助: 中国地质调查局“陕东—晋西地区气钾兼探战略调查(编号: DD20179624)”项目资助

摘要

鄂尔多斯盆地东部太原组在绥德地区发育一套潜在的烃源岩,总有机碳(Total Organic Carbon,TOC)含量为0.75%~5.71%(平均2.75%); 镜质体反射率( R_o)为1.43%~2.12%(平均1.80%),处在高成熟—过成熟阶段,具有很好的生气潜力。为了探讨鄂尔多斯盆地东部太原组泥页岩的吸附特征,选取了研究区SSD1井10个泥页岩样品进行等温吸附、总有机碳含量、镜质体反射率、X-射线衍射和比表面积等测试分析,在此基础上探讨了盆地东部太原组富有机质泥页岩的吸附能力及其影响因素。结果表明: 研究区SSD1井太原组10个泥页岩样品的兰氏体积为1.11~2.41 m³/t,随着压力的增加,吸附能力迅速增加,当达到一定压力后达到饱和; 泥页岩的吸附能力与总有机碳含量和黏土矿物含量有正相关关系; 页岩比表面积与兰氏体积相关性不明显,推测样品孔隙大小及形态对气体的扩散和吸附有一定的影响。综合评价认为,总有机碳含量、黏土矿物含量是影响太原组泥页岩吸附能力的重要因素,这为盆地东部页岩气勘探提供参考。

关键词: 页岩; 吸附能力; 影响因素; 太原组; 鄂尔多斯盆地

中图分类号:TE132.2;P618.13 文献标志码:A 文章编号:2095-8706(2019)04-0051-07

Shale gas adsorption characteristics and influencing factors of Taiyuan Formation in Eastern Ordos Basin

XIONG Quan¹, PENG Yuan², TANG Youjun¹, CHEN Tianyu², MAO Yahui²

1. Key Laboratory of Oil and Gas Resources and Exploration Technology, Ministry of Education, College of Resources and Environment, Yangtze University, Wuhan 430100, China

2. Key Laboratory of Salt Lake Resources and Environment, Ministry of Natural Resources; Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

Abstract

Taiyuan Formation in Eastern Ordos Basin develops a set of potential hydrocarbon source rocks in Suide area of the study area. Its total organic carbon content is between 0.75% and 5.71%, with an average content of 2.75%, and its organic maturity ( R_o) is mainly between 1.43% and 2.12%, with an average of 1.80%. It is in the stage of high maturity to over maturity and has a good gas potential. In order to study the adsorption characteristics of shale from Taiyuan Formation in Eastern Ordos Basin, 10 shale samples from well SSD1 in the study area were selected for isothermal adsorption, total organic carbon content, vitrinite reflectance, X-ray diffraction and specific surface area test. On this basis, the adsorption capacity and the influencing factors of organic-rich shale from Taiyuan Formation in Eastern Ordos Basin were discussed. The results show that the Langmuir volume of 10 shale samples from Taiyuan Formation of well SSD1 in the study area is 1.11-2.41 m³/t. With the increase of pressure, the adsorption capacity increases rapidly and reaches saturation at a certain pressure. The adsorption capacity of shale is positively correlated with the total organic carbon content and clay mineral content, while the specific surface area of shale is not significantly correlated with Langmuir volume. It is possible that the pore size and morphology of the sample have some influence on gas diffusion and adsorption. The comprehensive evaluation shows that the total organic carbon content and clay mineral content are important factors affecting the adsorption capacity of shale in Taiyuan Formation, which can provide some reference for shale gas exploration in the eastern part of the basin.

Keyword: shale; adsorption capacity; influencing factors; Taiyuan Formation; Ordos Basin

图片选项

0 引言

页岩气主要以2种状态赋存于泥页岩中, 一种以游离态存在于孔隙中, 另一种是以吸附态存在于有机质和黏土矿物表面; 很少一部分以溶解态赋存于有机质中^{[1, 2, 3]}。吸附气是页岩气气藏中重要的存在状态^{[4, 5]}, 李新景等^[6]认为吸附气至少占含气总量的40%, Sondergeld等^[7]观察Barnett页岩岩芯后认为吸附气占含气总量的40%~45%。而从一定意义上说 , 游离在孔缝中的天然气是原始页岩中吸附态天然气在孔隙裂缝发育到一定程度时解吸形成的^{[8, 9]}。由此可见, 研究页岩的吸附特征及其影响因素具有重要意义。

目前, 我国南方下古生界海相页岩气资源勘查开发已取得重大突破, 华北地区三叠系陆相页岩气勘查也有了长足进展, 在鄂尔多斯盆地南部建立了“ 延长石油延安国家级陆相页岩气示范区” ^[10]。鄂尔多斯盆地上古生界海陆过渡相泥页岩层具有分布范围广、构造稳定、热演化程度适中、保存条件好等特点, 具有良好的页岩气勘探潜力。相较于海、陆相页岩气, 对海陆过渡相页岩气的研究亟待突破, 尤其对于其页岩含气性及吸附特征的研究意义重大^{[11, 12]}。而页岩的吸附气量受多种地质因素的影响, 所采集泥页岩样品只能在接近地层温压的实验环境下通过等温吸附实验获得其吸附能力^[13]。一般认为, 泥页岩的吸附能力会受到温度、压力、总有机碳(Total Organic Carbon, TOC)含量、热演化程度、孔隙结构和比表面积及矿物成分等多因素的影响^[14]。本文以鄂尔多斯盆地绥德地区SSD1井为例, 选取该井10个太原组富有机质泥页岩样品, 通过等温吸附、总有机碳含量、有机质成熟度、X-射线衍射、比表面积等测试分析, 针对上述主要因素, 分析各因素与兰氏体积的相关性, 综合评价鄂尔多斯盆地东部太原组海陆过渡相页岩吸附特征及其影响因素, 以期为研究区页岩气勘探提供参考。

1 研究区地质概况

鄂尔多斯盆地属于大型多旋回克拉通盆地, 构造较为稳定, 经历了基底、盆地发展和盆地改造等演化阶段^{[15, 16]}。绥德地区继承了鄂尔多斯盆地构造演化特征, 在中元古代— 古生代处于相对隆起状态, 构造平缓; 早二叠世后期海水在较短地质时期内向华北陆表海盆的东南部退却, 发育海陆过渡相— 陆相沉积; 侏罗纪末期抬升隆起^[17]。

研究区位于鄂尔多斯盆地东部绥德地区, 构造位置在晋西挠褶带与伊陕斜坡之间(图1)。太原组为研究区主要含煤地层之一, 以灰黑色页岩、粉砂质泥岩、泥质粉砂岩与砂岩互层、泥晶灰岩、生物碎屑灰岩及煤层为主, 属于障壁海岸沉积体系^{[18, 19]}。在盆地东部广大地区石炭系— 二叠系泥页岩有机质类型主要为Ⅲ 型, 镜质体反射率(R_o)在0.6%~1.2%之间变化, 总有机碳(TOC)含量介于1.0%~2.5%之间, 显示该地区石炭系— 二叠系海陆过渡相烃源岩具有很好的生烃潜力^[20]。

	Figure Option View Download New Window
	图1 鄂尔多斯盆地东部区域构造简图及SSD1井位置Fig.1 Tectonic units and location of well SSD1 in Eastern Ordos Basin

2 样品采集与测试

本文研究的泥页岩样品取自鄂尔多斯盆地东部绥德地区SSD1井的石炭系— 二叠系太原组地层。该井太原组上部岩性主要为灰色薄层灰岩, 中下部岩性主要为深灰色泥岩, 局部夹薄层砂岩, 是典型的潜在烃源岩发育层段^[13]。

对所有样品均进行了X-射线衍射、总有机碳、镜质体反射率、孔隙度、比表面积、孔径分布以及等温吸附等分析。将粉碎至80目的泥页岩样品置于密闭容器中, 测定每个样品在同一温度、不同压力下达到平衡状态时吸附甲烷气体积, 进而求取兰氏压力和兰氏体积。实验条件为: 温度30 ℃, 甲烷气浓度99.999%, 最高实验压力约30 MPa, 共测试了8个压力点, 分别为0、0.77 MPa、2.44 MPa、5.64 MPa、9.91 MPa、15.57 MPa、24.13 MPa和30.55 MPa, 自低到高对每个压力点进行实验, 一共测试了10个太原组泥页岩样品。

3 等温吸附特征

页岩气等温吸附实验是指在同一温度下, 测定不同压力条件时吸附介质对天然气的吸附体积^[21]。作为页岩气及煤层气吸附特征评价的重要依据, Langmuir模型被广泛应用于天然气吸附特征评价中^[22]。前人研究发现盆地东部绥德地区处于2.0~2.5 ℃/100 m的地温梯度分布区^{[23, 24]}, 研究区太原组深度分布于1 614~1 709 m, 以2.0 ℃/100 m地温梯度计算, 地层温度约在33.23 ℃, 故而此次太原组10个泥页岩样品等温吸附实验温度选在30 ℃。 Langmuir模型是假设吸附介质与气体分子在吸附和解吸过程中处在动态平衡时^[18], 均一吸附介质表面完全被气体覆盖后的吸附量, 在实际应用中为确定等温吸附是否满足Langmuir模型, 可将其表达式变形为

$\frac{P}{V} = \frac{P}{V_{L}} + \frac{P_{L}}{V_{L}}$ , (1)

式中: P为实验设定压力, MPa; V为在对应设定下样品产生的吸附量, m³/t; V_L为极限压力条件时的吸附体积, 也称兰氏体积或最大理论吸附气量, m³/t; P_L为1/2兰氏体积对应的压力, 称为兰氏压力, MPa。

以P/V对P作图, 若二者存在线性关系, 则说明符合Langmuir吸附式。分别将10个样品的实验数据代入式(1), 通过图2可以看到Langmuir模型与等温吸附线可以很好地拟合, 拟合精度分布在0.995 6~0.997 1, 平均0.996 3, 说明基于本次实验的等温吸附式可以较准确描述样品对甲烷气体单层吸附的过程和结果。

	Figure Option View Download New Window
	图2 SSD1井太原组泥页岩等温吸附P/V与压力P拟合关系Fig.2 Isothermal adsorption P/V-P relation of shale in Taiyuan Formation of wel SSD1

在温度不变的情况下, 吸附量会先随着平衡压力的增加而迅速增加, 当平衡压力增加到一定程度后, 吸附量增速减缓并趋于饱和(图3)。

	Figure Option View Download New Window
	图3 兰氏体积(V_L)与压力(P_L)拟合曲线Fig.3 Fitting Curves of V_L and P_L

SSD1井太原组泥页岩样品的兰氏体积(V_L)范围为1.11~2.41 m³/t, 平均为1.76 m³/t(表1); 本次实验样品的兰氏压力值中等偏低, 介于1.89~2.20 MPa, 均值为2.07 MPa。

表1 SSD1井石炭系— 二叠系太原组泥页岩样品等温吸附实验结果 Tab.1 Isothermal adsorption experiment results of Carboniferous-Permain mud shale from well SSD1

4 吸附特征的影响因素

4.1 地球化学特征与页岩气吸附能力

分析SSD1井太原组10个泥页岩样品的地球化学参数, 总有机碳(TOC)含量分布在0.75%~5.71%, 平均含量为2.75%, 一般认为页岩气有机质丰度下限为2%^[25]。由此可见, 太原组泥页岩有机质丰度高, 具备较好的生气物质基础; 样品的镜质体反射率(R_o)主要分布在1.43%~2.12%, 平均为1.80%, 处在高成熟— 过成熟阶段(表2)。

表2 SSD1井太原组泥页岩地球化学参数与矿物组成 Tab.2 Geochemical parameters and mineral composition of shale in Taiyuan Formation of well SSD1

通过总有机碳含量(TOC)与兰氏体积(V_L, 即最大吸附气量)相关关系图(图4)可以看出, 有机碳含量越高, 最大吸附气量越高, 二者呈明显正相关, 与前人研究认识一致^[26]。

	Figure Option View Download New Window
	图4 SSD1井太原组泥页岩TOC含量与V_L关系Fig.4 Relation diagram of TOC and V_L of shale in Taiyuan Formation of well SSD1

但随着成熟度的增加, 总有机碳含量呈现先增大后减小的特点, 页岩气的吸附能力也随之减小(图5、图6)。

	Figure Option View Download New Window
	图5 SSD1井太原组泥页岩总有机碳(TOC)含量与镜质体反射率(R_o)关系Fig.5 Relation diagram between TOC and R_o of shale in Taiyuan Formation of well SSD1

	Figure Option View Download New Window
	图6 SSD1井太原组泥页岩兰氏体积(V_L)与镜质体反射率(R_o)关系Fig.6 Relation diagram between V_L and R_o of shale in Taiyuan Formation of well SSD1

4.2 矿物成分

SSD1井太原组泥页岩样品中主要的矿物成分为黏土矿物和石英, 其次为碳酸盐矿物、黄铁矿和长石(表2)。石英含量为2.0%~92.4%, 平均为44.4%; 黏土矿物含量为3.1%~98.0%, 平均为49.1%; 碳酸盐矿物含量为4.5%~18.0%, 平均为9%; 黄铁矿含量为0%~6.8%, 平均为0.2%; 长石含量为0%~1.9%, 平均为0.2%。石英、长石和碳酸盐矿物为脆性矿物, 对泥页岩储集层裂缝产生改造并对后期页岩气开采压裂有很大影响, 从而影响页岩气的吸附能力。为了更直观了解页岩矿物成分对吸附气的影响, 在页岩CT图像中将矿物与孔隙进行分割, 分割后图中红色部分为孔隙(图7), 样品发育层间微裂隙和有机质孔隙, 层间微裂隙呈片状, 连通性较好, 有机质孔隙呈孤立状分布, 有机质孔隙内部相互连通, 彼此间不连通。

	Figure Option View Download New Window
	图7 SSD1井太原组泥页岩样品微米CT扫描三维重构图Fig.7 Three-Dimensional Reconstruction pictures of shale samples from Taiyuan Formation in well SSD 1 by Micron CT Scanning

通过分析发现, 黏土矿物含量与兰氏体积(V_L)为正相关关系(图8), 脆性矿物含量与兰氏体积(V_L)为负相关关系(图9)。黏土矿物对研究区太原组泥页岩样品吸附能力有显著影响, 认为黏土矿物对晶体结构和其所形成的层间孔隙相互之间的连通性影响了吸附气量。

	Figure Option View Download New Window
	图8 SSD1井太原组泥页岩黏土矿物含量与V_L关系Fig.8 Relation diagram between clay mineral content and V_L of shale in Taiyuan Formation of well SSD1

	Figure Option View Download New Window
	图9 SSD1井太原组泥页岩脆性矿物含量与V_L关系Fig.9 Relation diagram between clay mineral content and V_L of shale in Taiyuan Formation of well SSD1

4.3 微观孔径

页岩储层的基质孔隙远小于常规油气储层的数量级, 其储层内部的这些纳米级孔隙还是页岩气的重要储存空间^[27]。对孔径的影响因素包括页岩自身矿物成分不同的影响, 也包括生烃过程中对孔径的改造, 最后表征为孔径结构、大小和面积等方面的变化。SSD1井太原组10个泥页岩样品比表面积测试分析(表3)表明, 样品的总孔体积为0.000 225~0.014 800 mL/g, 发育平均孔径介于2~50 nm之间的中孔, 比表面积为0.002 9~11.124 0 m²/g。

表3 SSD1井太原组泥页岩低温氮气吸附结果 Tab.3 Nitrogen adsorption at low temperature in shale of Taiyuan Formation in well SSD1

以吸附气量最大的样品SSD1-4为例, 其氮气吸附/脱附曲线如图10所示, 可以看到吸附/脱附曲线为H₂型, 形态上“ 口小肚大” , 吸附量在相对压力处于0.4~1.0范围内逐渐增加, 有明显转折点存在。

	Figure Option View Download New Window
	图10 SSD1-4页岩样品氮气吸附/脱附曲线Fig.10 Adsorption and desorption curves of shale samples of SSD1-4

通过基于开尔文毛细管凝聚理论的气体吸附法(Barret, Joyner和Halenda方法, 简称BJH法)计算介孔孔径分布, 用孔体积对孔直径的微分(d(V)/d(lg D))与孔径的关系图来表征样品SSD1-4的孔径分布特征(图11)。平均比表面积为5.587 m²/g, 平均孔直径为6.17 nm, 孔径在中孔出现“ 单峰型” 峰值, 表明孔隙主要由中孔组成。

	Figure Option View Download New Window
	图11 SSD1-4页岩样品氮气吸附-脱附法孔径分布曲线Fig.11 Pore size distribution curves of shale samples of SSD1-4 by N₂ adsorption-desorption method

SSD1井太原组泥页岩样品与吸附气量关系如图12。

	Figure Option View Download New Window
	图12 SSD1井太原组泥页岩比表面积与兰氏体积关系Fig.12 Relation diagram between specific surface area of shale and V_L in Taiyuan Formation of well SSD1

可以看出, 页岩比表面积与兰氏体积V_L相关性不是很明显, 可能因为研究区泥岩样品主要发育中孔, 游离气会偏多一些, 且“ 墨水瓶” 型孔隙对气体的扩散和吸附有一定的影响。

5 结论

(1)鄂尔多斯盆地东部太原组海陆过渡相富有机质泥页岩的兰氏体积为1.11~2.41 m³/t, 在温度不变的情况下, 吸附量会先随着平衡压力的增加而迅速增加, 当平衡压力增加到一定程度后, 吸附量增速减缓并趋于饱和。

(2)总有机碳(TOC)含量与泥页岩吸附能力呈正相关, TOC含量越大, 吸附能力越强。成熟度增加, TOC含量先增大后减小, 页岩气的吸附能力也随之减小。

(3)黏土矿物含量与吸附能力具较好的正相关性, 脆性矿物与吸附能力呈负相关。黏土矿物对晶体结构和其所形成的层间孔隙相互之间的连通性影响了吸附气量。

(4)研究区太原组泥页岩样品主要发育中孔, 游离气会偏多一些, 且“ 墨水瓶” 型孔隙对气体的扩散和吸附有一定的影响, 使得页岩比表面积与兰氏体积相关性不是很明显。

参考文献

文献选项

[1]	王香增. 陆相页岩气[M]. 北京: 石油工业出版社, 2014: 1-3. [本文引用:1]
[2]	Curtis J B. Fractured shale-gas systems[J]. AAPG Bull, 2002, 86(11): 1921-1938. [本文引用:1]
[3]	张金川, 金之钧, 袁明生. 页岩气成藏机理和分布[J]. 天然气工业, 2004, 24(7): 15-18. [本文引用:1]
[4]	刘雄辉. 页岩岩石学特征及其对吸附气量的影响——以四川盆地焦石坝地区为例[D]. 成都: 西南石油大学, 2015. [本文引用:1]
[5]	李艳丽. 页岩气储量计算方法探讨[J]. 天然气地球科学, 2009, 20(3): 466-470. [本文引用:1]
[6]	李新景, 吕宗刚, 董大忠, 等. 北美页岩气资源形成的地质条件[J]. 天然气工业, 2009, 29(5): 27-32. [本文引用:1]
[7]	Sondergeld C H, Ambrose R J, Rai C S, et al. Micro-structural studies of gas shales[R]. USA: SPE, 2010: 131-771. [本文引用:1]
[8]	武景淑,于炳松,李玉喜.渝东南渝页1井页岩气吸附能力及其主控因素[J].西南石油大学学报:自然科学版,2012,34(4):40-48.
[9]	董大忠, 程克明, 王玉满, 等. 中国上扬子区下古生界页岩气形成条件及特征[J]. 石油与天然气地质, 2010, 31(3): 288-299, 308. [本文引用:1]
[10]	李伟, 王涛, 王秀玲, 等. 陆相页岩气水平井固井技术——以延长石油延安国家级陆相页岩气示范区为例[J]. 天然气工业, 2014, 34(12): 106-112. [本文引用:1]
[11]	耳闯, 赵靖舟, 王芮, 等. 鄂尔多斯盆地三叠系延长组富有机质页岩孔隙特征及发育机制[J]. 天然气地球科学, 2016, 27(7): 1202-1214. [本文引用:1]
[12]	唐玄, 张金川, 丁文龙, 等. 鄂尔多斯盆地东南部上古生界海陆过渡相页岩储集性与含气性[J]. 地学前缘, 2016, 23(2): 147-157. [本文引用:1]
[13]	高和群, 曹海虹, 丁安徐, 等. 海相页岩和陆相页岩等温吸附特性及控制因素[J]. 天然气地球科学, 2013, 24(6): 1290-1297. [本文引用:2]
[14]	任建华, 蔺景德, 张亮, 等. 页岩气藏吸附特征及其对产能的影响[J]. 新疆石油地质, 2013, 34(4): 441-444. [本文引用:1]
[15]	刘池洋, 赵红格, 桂小军, 等. 鄂尔多斯盆地演化-改造的时空坐标及其成藏(矿)响应[J]. 地质学报, 2006, 80(5): 617-638. [本文引用:1]
[16]	王双明. 鄂尔多斯盆地叠合演化及构造对成煤作用的控制[J]. 地学前缘, 2017, 24(2): 54-63. [本文引用:1]
[17]	任战利, 张盛, 高胜利, 等. 鄂尔多斯盆地构造热演化史及其成藏成矿意义[J]. 中国科学(D辑): 地球科学, 2007, 37(增刊1): 23-32. [本文引用:1]
[18]	谢英刚, 秦勇, 叶建平, 等. 临兴地区上古生界煤系致密砂岩气成藏条件分析[J]. 煤炭学报, 2016, 41(1): 181-191. [本文引用:2]
[19]	吴鹏, 高计县, 郭俊超, 等. 鄂尔多斯盆地东缘临兴地区太原组桥头砂岩层序地层及沉积特征[J]. 石油与天然气地质, 2018, 39(1): 66-76. [本文引用:1]
[20]	李剑, 罗霞, 单秀琴, 等. 鄂尔多斯盆地上古生界天然气成藏特征[J]. 石油勘探与开发, 2005, 32(4): 54-59. [本文引用:1]
[21]	任泽樱, 刘洛夫, 高小跃, 等. 库车坳陷东北部侏罗系泥页岩吸附能力及影响因素分析[J]. 天然气地球科学, 2014, 25(4): 632-640. [本文引用:1]
[22]	韩伟, 艾宁, 李玉宏, 等. 六盘山盆地页岩吸附气赋存条件及其影响因素[J]. 石油实验地质, 2019, 41(1): 127-133. [本文引用:1]
[23]	于强, 任战利, 王宝江, 等. 鄂尔多斯盆地延长探区上古生界热演化史[J]. 地质论评, 2012, 58(2): 303-308. [本文引用:1]
[24]	任战利, 于强, 崔军平, 等. 鄂尔多斯盆地热演化史及其对油气的控制作用[J]. 地学前缘, 2017, 24(3): 137-148. [本文引用:1]
[25]	张洁. 鄂尔多斯盆地东部上古生界烃源岩评价[D]. 西安: 西安石油大学, 2012. [本文引用:1]
[26]	Ross D J K, Bustin R M. Shale gas potential of the Lower Jurassic Gordondale member, northeastern British Columbia, Canada[J]. Bull Can Petrol Geol, 2007, 55(1): 51-75. [本文引用:1]
[27]	戴方尧. 川东—湘西地区龙马溪组与牛蹄塘组页岩孔隙与页岩气赋存机理研究[D]. 武汉: 中国地质大学(武汉), 2018. [本文引用:1]

2014

0.0

... 很少一部分以溶解态赋存于有机质中^[1,2,3] ...

2002

0.0

... 很少一部分以溶解态赋存于有机质中^[1,2,3] ...

2004

0.0

张金川, 金之钧, 袁明生. 页岩气成藏机理和分布[J]. 天然气工业, 2004, 24(7): 15-18.

The reservoiring mechanism of shale gas is of the features of both the coalbedadsorbed methane and the conventionally trapped gas reservoirs，it showing a complicated multiplemechanism gradation character. In the reservoiring process of shale gas，the occurrence manner of the gas and the reservoiring type were gradually changed，and the abundance and enrichment degree of the gas were gradually increased. An whole process of the formation and evolution of shale gas reservoir may be divided into three stages，i.e. the absorption and accumulation stage，the expansion and cracking stage and the pistonlike driving or displacementlike migration stage. Relevant change in reservoiring condition and mechanism could control and influence the formation and distribution of shale gas reservoirs and the lithologic change and fracture development status played a control role in the occurrence and distribution of the gas in shale gas reservoir. The basic geological conditions of forming commercial shale gas reservoirs exist in many basins in China，in which Shuixigou Group in Tulufan Depression of Tuha Basin is one of the important horizons of shale gas generation.

1.China University of Geosciences; 2.Research Institute of Petroleum Exploration and Development，Sinopec; 3.Tuha Oil Field Branch Company

对页岩气成藏机理进行了全面分析，获得了四个方面的认识。①页岩气成藏机理兼具煤层吸附气和常规圈闭气藏特征，体现出了复杂的多机理递变特点。②在页岩气的成藏过程中，天然气的赋存方式和成藏类型逐渐改变，含气丰度和富集程度逐渐增加。③完整的页岩气成藏与演化可分为3个主要的作用过程，自身构成了从吸附聚集、膨胀造隙富集到活塞式推进或置换式运移的机理序列。④相应的成藏条件和成藏机理变化对页岩气的成藏与分布产生了控制和影响作用，岩性特征变化和裂缝发育状况对页岩气藏中天然气的赋存特征和分布规律具有控制作用。研究了我国的情况，认为我国的许多盆地存在工业性页岩气藏发育的基本地质条件，其中，吐哈盆地吐鲁番坳陷的水西沟群是页岩气发育的重要区域之一。

... 很少一部分以溶解态赋存于有机质中^[1,2,3] ...

2015

0.0

... 吸附气是页岩气气藏中重要的存在状态^[4,5],李新景等^[6]认为吸附气至少占含气总量的40%,Sondergeld等^[7]观察Barnett页岩岩芯后认为吸附气占含气总量的40%~45% ...

2009

0.0

李艳丽. 页岩气储量计算方法探讨[J]. 天然气地球科学, 2009, 20(3): 466-470.

As an unconventional gas reservoir, the calculation method of shale gas differs from conventional gas reservoirs. Shale gas reservoir has two special characters: one is that shale gas occurs as free gas and adsorbed gas, which are stored in natural fractures and matrix pores, the other is that the production mechanism shows two main processes including diffusion of free gas and desorption of adsorbed gas. Many calculation methods of shale gas reservoirs such as analog method, volumetric method, pressure and cumulative production method, material\|balance method, production decline method are summarized, and the applicable conditions and limitations of all methods are discussed. Some important issues are also pointed out such as adsorption capacities, natural fractures, quantification methods of porosity and gas saturation.

(Geological Scientific Research Institute, SLOF, SINOPEC, Dongying 257015, China)

页岩气藏是一种非常规气藏,由于气藏特征的特殊性导致储量计算方法有别于常规气藏。首先探讨了页岩气藏的特殊性,其一是存储特征为形式上游离气和吸附气并存、空间上孔隙和裂缝同在；其二是产气机制主要为游离气的扩散和吸附气的解吸。在此基础上,总结了计算页岩气储量的方法,主要有类比法、容积法、压力/累计产量法、物质平衡法、递减曲线分析等,并讨论了各种方法的适用条件。同时,指出在页岩气储量计算中应特别重视孔隙度、裂缝、吸附气、含气饱和度等几个关键问题,并介绍了这些参数的确定方法。

2009

0.0

李新景, 吕宗刚, 董大忠, 等. 北美页岩气资源形成的地质条件[J]. 天然气工业, 2009, 29(5): 27-32.

Great success of Barnett shale gas production in the Fort Worth basin has promoted worldwide exploration and development of shale gas. Analysis of the geologic features and knowledge of the regional geologic settings of the producing shale gas plays in North America are helpful for establishing shale gas accumulation patterns, searching for effective gas shale reservoirs, delineating of sweet points, and enhancing shale gas recovery. Shale gas of various geneses and various maturities accumulate in the Jurassic and DevonianMississippian in the craton basins and foreland basins of North America. Generally, the gas is mainly produced from the major source rocks of the petroleum system, especially the dark shale (type ⅠⅡ) of TST deposited in a lowenergy reducing environment with ascending current. Depositional environment and thermal maturity are the main factors controlling shale gas accumulation, while the level of fracture network development determines the commercial value of gas shale reservoirs. Therefore, palaeoclimate, palaeogeographic conditions, sedimentary environment and tectonic action jointly contributed to the formation and effective production of shale gas in North America.

1.PetroChina Research Institute of Petroleum Exploration and Development，Beijing 100083，China; 2.PetroChina Southwest Oil & Gasfield Company, Chengdu 610051,China

Fort Worth 盆地Barnett页岩气藏的成功开发，极大地推动了全球页岩气勘探开发进程。分析北美地区已开发页岩气聚集区带油气地质特征，了解区域地质背景，有助于建立页岩气富集模式、寻找有效页岩气储层、确定“甜点”边界、提高采收率等。研究表明，北美克拉通盆地、前陆盆地侏罗系、泥盆系—密西西比系富集多种成因、多种成熟度页岩气资源，页岩产层通常是含油气系统中主力烃源岩，尤以受上升洋流影响、具有低能还原环境的海进体系域黑色页岩（腐泥型—混合型干酪根）为佳。沉积环境和热成熟度是页岩气富集区带主要控制因素，裂缝网络发育程度决定能否获取丰厚的商业价值。因此，古气候、古地理条件以及沉积环境、构造作用等因素的综合，使得北美页岩气资源形成并不断得到有效开发。

2010

0.0

2010

0.0

董大忠, 程克明, 王玉满, 等. 中国上扬子区下古生界页岩气形成条件及特征[J]. 石油与天然气地质, 2010, 31(3): 288-299, 308.

W ith focus on the sedimentary，geoˉchem istry，reservoir，and gas potential，a prelim inary study is perˉformed on the form ing conditions and characteristics of the shale gas in the Lower Silurian Longmaxi Formation and the Lower Cambrian Qiongzhu Formation in the Upper Yangtze region by using outcrop，drilling，and core data.The results indicate that an Early Paleozoic shallowˉdeep water shelf sedimentary environment controlled the development and distribution of the organicˉrich black shale in the formations.The black shale is the thickest in the depocenter on the deep water shelf.TheirTOC values are generally high.Horizontally，the distribution of organic rich black shale（TOC>2%）is in accordance with that of the shelf.In contrast，vertically，theymainly occur in the m iddleˉlower and bottom parts of the formations and have a continuous thickness of30-50m and a TOC value over4%.Being sim ilar to the gasˉbearing shale in America，the black shale is rich in brittlem ineˉrals，but unitary in clay m ineral type，and contains no smectite.The matrix contains wellˉdeveloped pores and m icroˉfissures，occurring in threadlike，netted and honeycomb shapes.The measured porosity of core samples ranges from2%to16%，indicatingmoderate poroperm characteristics.Active gas shows occur during drilling in the black shale.Gas content of core samples is above the industrial development threshold.Isothermal adsorption simulation of the samples also shows a high methane adsorption capacity.The overall gas potential is sim ilar to

从露头、钻井、岩心等资料出发，以沉积、地球化学、储层及含气性等为重点，对上扬子区下寒武统筇竹组和下志留统龙马溪组页岩气形成的地质条件与特征进行了初步探索，指出上扬子区早古生代的浅海-深水陆棚沉积环境控制了筇竹组、龙马溪组富有机质黑色页岩的发育与分布，深水陆棚沉积中心黑色页岩厚度最大;黑色页岩有机碳含量（TOC）普遍较高，平面上富有机碳黑色页岩（TOC>2%）与深水陆棚相分布一致，纵向上富有机碳黑色页岩集中发育在各组的中下部-底部，连续厚度约30～50m，有机碳含量在4%以上;黑色页岩脆性矿物丰富、含量大，粘土矿物单一、无蒙脱石，与美国产气页岩相似;基质孔隙、微裂缝发育，成丝状、网状及蜂窝状分布，岩心实测孔隙度为2%～16%，具有较好的孔、渗能力;黑色页岩钻井气显示活跃，岩心含气量在最低工业开发含气门限之上，等温吸附模拟甲烷吸附能力强，综合含气性特征与北美产气页岩类似。总体认为，中国上扬子区下古生界筇竹寺组、龙马溪组具有优越的页岩气形成地质条件，是较现实的页岩气勘探开发领域。

... 而从一定意义上说 ,游离在孔缝中的天然气是原始页岩中吸附态天然气在孔隙裂缝发育到一定程度时解吸形成的^[8,9] ...

2014

0.0

... ^[10] ...

2016

0.0

耳闯, 赵靖舟, 王芮, 等. 鄂尔多斯盆地三叠系延长组富有机质页岩孔隙特征及发育机制[J]. 天然气地球科学, 2016, 27(7): 1202-1214.

Pore characteristics of shale reservoir are significant content for shale reservoir appraisal,and also the basic for the occurrence mechanism study of shale oil and gas.One scheme for pore types division was recommended in this paper.The scheme is based on mineral matrix types,attitudes and origins of pores.Ar-iron milling and field emission scanning electronic microscope were used to observe pore characteristics.Based on mineral matrix types and attitudes of pores,four kinds of pores were determined,including intergranular pore,intragranular pore,organic matter pore and micro-fracture.Then,according to the origins of pores,sub-types of pores were distinguished.Intergranular pore was divided into primary pores among clastic grains,pores among clay minerals aggregation,and dissolved pores among clastic grains.Intragranular pore include dissolved pores in feldspar,pores among (between) plates of clay minerals,and pores among pyrite crystal.Organic matter pores mainly incorporate micro-fracture in organic matter grain and pores with micro diameter discretely distributed in organic matter grain.Micro-fracture mainly includes fracture between lamina and lamellation.Sedimentary environment,diagenesis and thermal evolution of organic matter co-controlled the origin and preservation of pores in shale.Semi-deep to deep lacustrine environment was conducive to forming organic-rich shale accompanied by thin sandy lamina with origin of gravity flow.Shale deposited with these features was favor of primary pores among clastic grains,pores in calstic grains,and micro-fracture along lamina.Pyrites that formed during eodiagenesis were favor of pores among pyrites,but pyrite also participated in compaction.Compaction caused pore diameter becoming narrower and pore volume becoming smaller,particularly for intragranular pore and intergranular pore.Contact relation between clastic grains and organic matter grains was concave-convex,also between pyrites and organic matter grains.Organic matter pores closed under compaction resulting in organic matter pore not well developed in Chang-7 Member.Dissolution was helpful to form dissolved pores among or in feldspar,as a result,reservoir quality may be improved.There may be no organic matter pore until maturity reached some level (maybe R O ≈0.75%).One of the reason why organic matter pore not well developed is the low maturity,another reason is compaction during burial.Moreover,as permeability of organic rich shale is very low and hydrocarbon may be adsorbed on or dissolved to kerogen,the volume of kerogen may swell resulting in organic matter pore not well developed.

1.School of Earth Science and Engineering,Xi’an Shiyou University,Xi’an 710065,China; 2.Shaanxi Key Lab of Petroleum Accumulation Geology,Xi’an 710065,China; 3.The 2 nd Oil Production Plant of Dagang Oilfield Company,PetroChina,Huanghua 061103,China; 4.China Petroleum Logging Co.Ltd.,Xi’an 710077,China

页岩储层孔隙发育特征是页岩储层评价的重要内容，也是开展页岩油气赋存机理研究的基础。提出了通过“基质类型—孔隙产状—孔隙成因”划分孔隙类型的方案。利用氩离子抛光和场发射扫描电镜技术观察孔隙发育情况，根据基质类型和孔隙产状，识别了4类孔隙：粒间孔、粒内孔、有机质孔和微裂缝，并根据孔隙成因将粒间孔分为碎屑颗粒间原生孔、黏土矿物片体间孔和颗粒间溶蚀孔，将粒内孔分为长石颗粒内溶蚀孔、黏土矿物片体内孔和黄铁矿晶体间孔。有机质孔主要为有机质颗粒内的微裂缝和有机质内孤立分布的孔径较小的孔隙。微裂缝主要表现为纹层缝或页理缝。综合孔隙图像分析、低温液氮吸附实验结果、孔隙结构参数与矿物组成、有机碳含量和有机质成熟度等参数相关性分析，认为沉积条件、成岩作用和有机质热演化控制了孔隙的形成和保存。半深湖—深湖沉积环境下，富有机质页岩中发育重力流成因的薄层砂质纹层，纹层段碎屑颗粒含量高，有利于形成碎屑颗粒粒间孔、碎屑颗粒粒内孔和顺层微裂缝。早期成岩作用阶段形成黄铁矿，有利于形成黄铁矿晶间孔，但黄铁矿也是压实作用的主要参与者；压实作用造成粒间孔和粒内孔的孔径变小和孔体积降低，碎屑颗粒和黄铁矿与有机质颗粒间呈凹凸接触，有机质孔在压实作用下闭合导致有机质孔不发育；溶蚀作用促进长石粒间溶孔和长石粒内溶孔的形成，一定程度改善储层质量。在成熟度达到一定阶段( R O ≈0.75%)后，开始出现有机质孔。有机质孔发育程度差，一方面受成熟度的影响，另一方面可能是压实作用造成的。此外，富有机质泥页岩渗透性较差，烃类被吸附在有机质表面或溶于干酪根内部，造成干酪根体积膨胀也可能是有机质孔不发育的一种原因。

... 相较于海、陆相页岩气,对海陆过渡相页岩气的研究亟待突破,尤其对于其页岩含气性及吸附特征的研究意义重大^[11,12] ...

2016

0.0

... 相较于海、陆相页岩气,对海陆过渡相页岩气的研究亟待突破,尤其对于其页岩含气性及吸附特征的研究意义重大^[11,12] ...

2013

0.0

高和群, 曹海虹, 丁安徐, 等. 海相页岩和陆相页岩等温吸附特性及控制因素[J]. 天然气地球科学, 2013, 24(6): 1290-1297.

Based on the measured isotherm adsorption data of marine and continental organic-rich shale,discussion has been performed on the characteristics of isotherm adsorption and its relationship with all controlling factors.The difference between them was illustrated in detail.The results are as follows.The shape of the isotherm curve of marine shale changes smoothly,while it is divided into two parts for the continental shale,i.e.shale with coals has much higher maximum adsorption than that of marine shale,and shale without coal has relatively low maximum adsorption.The maximum adsorption of marine and continental shale is positively correlated with total organic carbon (TOC) and specific surface area.In addition,the marine shale adsorption increases with vitrinite reflectance (R O ) and quartz percentage in bulk composition,and decreases with clay percentage,however,these features are unclear for the continental shale.Although during the over mature stage,the maximum adsorption of marine shale is still positively correlated with TOC.with the continental shale has lower metamorphism,and the relationship between maximum adsorption and R O displays a mode of two-section type,i.e.R O O ;R O >1.3%,namely during the mature stage,it becomes smaller.The sedimentary environment,organic thermal evolution and type of marine and continental shale played important roles in these features.

(East China Branch of the Exploration & Production Research Institute,SINOPEC,Yangzhou 225007,China)

以海相、陆相页岩等温吸附测试数据为基础，探讨其等温吸附特性及与各控气因素的关系，详细论述了它们的异同之处。结果表明，海相页岩的等温吸附曲线形态变化较小，而陆相页岩明显分为2部分，即含有煤岩成分的页岩，其最大吸附量远高于海相，不含煤岩的则较低；海相、陆相页岩最大吸附量与总有机碳（TOC）、比表面积均呈正相关，另外，海相页岩与镜质组反射率（R O ）、石英含量呈正相关，与黏土含量呈负相关，而陆相页岩的这一特点却不甚明显；海相页岩虽处在过成熟阶段，但最大吸附量和TOC依然呈正相关，陆相页岩的变质程度低于海相，与最大吸附量的关系呈现出2段式变化模型，R O O 值的升高而增大,R O >1.30%时，即达到成熟阶段之后，则变小。分析认为，海相、陆相页岩的沉积环境、沉积演化史及有机质类型是形成这些特征的重要因素。

... 而页岩的吸附气量受多种地质因素的影响,所采集泥页岩样品只能在接近地层温压的实验环境下通过等温吸附实验获得其吸附能力^[13] ...

... 该井太原组上部岩性主要为灰色薄层灰岩,中下部岩性主要为深灰色泥岩,局部夹薄层砂岩,是典型的潜在烃源岩发育层段^[13] ...

2013

0.0

... 一般认为,泥页岩的吸附能力会受到温度、压力、总有机碳(Total Organic Carbon,TOC)含量、热演化程度、孔隙结构和比表面积及矿物成分等多因素的影响^[14] ...

2006

0.0

刘池洋, 赵红格, 桂小军, 等. 鄂尔多斯盆地演化-改造的时空坐标及其成藏(矿)响应[J]. 地质学报, 2006, 80(5): 617-638.

Northwest University

鄂尔多斯盆地的发育时限为中晚三叠世―早白垩世,晚白垩世以来为盆地的后期改造时期;盆地主体具克拉通内盆地特征;现今盆地为经过多期不同形式改造的残留盆地。该盆地叠加在早、晚古生代大型盆地之上,又属多重叠合型盆地。鄂尔多斯盆地集油气、煤和铀于一盆,多种能源矿产丰富。根据盆地及周缘地区主要地质构造特征和地质事件,结合对盆地各区裂变径迹年龄的综合研究认为,在盆地发育时期(T2―K1)至少发生了4期明显的构造变动,将盆地的沉积-演化过程划分为4个阶段:中晚三叠世和早中侏罗世富县―延安期为盆地发育的两个鼎盛阶段,广泛接受沉积,湖盆宽阔,沉积范围为今残留盆地面积的2倍多;形成重要的含油和成煤岩系。这两个阶段被期间发生的区域抬升变动(J1)所分隔。抬升导致沉积间断,延长组顶部遭受强烈而不均匀的侵蚀下切,形成起伏较大的侵蚀地貌。延安期末盆地抬升变动不强烈,沉积间断和剥蚀延续时间短。随后又复沉降,进入盆地发育的第三阶段中侏罗世直罗-安定期:沉积范围仍较广阔,但湖区面积明显减小。晚侏罗世构造变动强烈,在盆地西缘形成逆冲-推覆构造带,在其东侧前渊局限堆积厚度不等的砾岩,盆地中东部地区遭受剥蚀改造;今黄河以西地区初显东隆西坳格局。在早白垩世阶段,沉积分布仍较广阔,不整合超覆在前期西缘冲断带和南、北边部隆起之上。在盆地演化的前三个阶段,沉积中心均分布在延安附近及其以东;而堆积中心则位于邻近物源的盆地西部,且不同阶段位置有别;直到早白垩世,盆地的沉积中心和堆积中心的分布位置才大体一致,主要位于盆地西部的中南段。早白垩世末,鄂尔多斯盆地整体抬升,大型盆地消亡;盆地开始进入后期改造时期。在晚白垩世以来的盆地后期改造时期,鄂尔多斯盆地主要发生了以下重要地质事件:1盆地主体持续幕式、差异性整体抬升和强烈而不均匀的剥蚀,东部黄河附近被剥蚀的中生界厚度最大可达2000m;2盆地本部长期幕式整体的差异抬升和剥蚀,形成3期区域侵蚀-夷平面(E32―E12,E23和N21);3地块边部裂陷,周缘断陷盆地相继形成,接受巨厚沉积;4持续达2亿多年的东隆西降运动于中新世晚期(8MaBP)反转易位;东部开始沉降,广泛接受红黏土沉积;六盘山、地块西缘和西部相继隆升;标志着中国西部区域构造运动对该区的影响更为重要;5分别在8MaBP和2.5MaBP,风成红黏土、黄土开始广泛堆积,先后形成红土准高原和黄土高原及黄土高原面;6黄河水系的发育、外流和侵蚀地貌的形成。根据各主要地质事件的发生和动力学环境的演变,将该区晚白垩世以来划分为5个演化阶段(K2―E1;E2-3;N1-21;N31―N2;Q)。这些地质事件的发生和构造变动,与周邻各构造域,特别是中国东、西部(含青藏高原)重大构造运动的复合、叠加及其与时彼此消长变化密切相关;其活动和改造,使中生代盆地的原始面貌大为改观。鄂尔多斯盆地多种能源矿产成生―成藏(矿)和定位的主要期次,与盆地中新生代演化和改造的阶段有明显的响应联系和密切的耦合关系。盆地演化末(晚)期及之后的整体差异隆升和区域剥蚀,对鄂尔多斯盆地多种能源矿产的成藏(矿)和分布及其相互作用的影响最为重要。

... 1 研究区地质概况鄂尔多斯盆地属于大型多旋回克拉通盆地,构造较为稳定,经历了基底、盆地发展和盆地改造等演化阶段^[15,16] ...

2017

0.0

... 1 研究区地质概况鄂尔多斯盆地属于大型多旋回克拉通盆地,构造较为稳定,经历了基底、盆地发展和盆地改造等演化阶段^[15,16] ...

2007

0.0

... 侏罗纪末期抬升隆起^[17] ...

2016

0.0

... 太原组为研究区主要含煤地层之一,以灰黑色页岩、粉砂质泥岩、泥质粉砂岩与砂岩互层、泥晶灰岩、生物碎屑灰岩及煤层为主,属于障壁海岸沉积体系^[18,19] ...

... Langmuir模型是假设吸附介质与气体分子在吸附和解吸过程中处在动态平衡时^[18],均一吸附介质表面完全被气体覆盖后的吸附量,在实际应用中为确定等温吸附是否满足Langmuir模型,可将其表达式变形为 ...

2018

0.0

2005

0.0

... 二叠系海陆过渡相烃源岩具有很好的生烃潜力^[20] ...

2014

0.0

任泽樱, 刘洛夫, 高小跃, 等. 库车坳陷东北部侏罗系泥页岩吸附能力及影响因素分析[J]. 天然气地球科学, 2014, 25(4): 632-640.

The shale gas is stored in shales mainly in adsorption and freedom states,and the former accounts for 40% to 85% of the total shale gas amount.Thus the shale adsorption capacity determines the pool scale of shale gas to some extent.In order to study the adsorption capacity and the influence factors the Jurassic shale in the northeastern Kuqa Depression,X-ray diffraction,microscopic pore structures and isothermal adsorption tests were carried out.The results indicate that the maximum amounts of adsorption (VL) range from 0.58 m 3 /t to 8.52m 3 /t,mainly lower than 2m 3 /t,and the Langmuir pressures are between 0.55MPa and 5.24MPa.The study shows that organic matter is the main carrier of adsorption gas and its abundance is the dominant factor influencing the adsorption capacity of the shale.When the organic matter content is low,the clay mineral is the main controlling factor for its strong adsorption capacity,and the micropore structure also significantly influences the adsorption capacity of the shale.The adsorption capacity for different types of clay minerals varies,and the illite-smectite mixed-layer has greater influence on the adsorption capacity of Jurassic shale in the northeastern Kuqa Depression for its larger adsorption property.A good positive correlation exists between the maximum amounts of adsorption gas and the specific surface area as well as total pore volume.In addition,the external conditions such as the moisture and pressure also affect the adsorption capacity to some extent.

1.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum (Beijing),Beijing 102249,China;2.Basin and Reservoir Research Center,China University of Petroleum (Beijing),Beijing 102249,China

页岩气主要以吸附和游离状态赋存于泥页岩中，其中吸附气含量占页岩气总量的40%~85%，泥页岩的吸附能力在一定程度上决定了页岩气成藏规模的大小。为研究库车坳陷东北部侏罗系泥页岩的吸附能力和影响因素，对采集的岩心样品进行了X-射线衍射全岩矿物、微观孔隙结构和等温吸附等分析测试。结果显示：研究区侏罗系泥页岩最大吸附气量（V L )介于0.58~8.52m 3 /t之间，多小于2m 3 /t；Langmuir压力介于0.55~5.24MPa之间。分析表明：有机质是页岩气吸附的主要载体，其丰度是泥页岩吸附能力的直接控制因素；在有机质含量较低时，黏土矿物具有较强的吸附能力，是泥页岩吸附能力的主控因素。此时，微观孔隙结构对泥页岩吸附能力影响较大；不同类型的黏土矿物对吸附能力的影响不同，研究区伊/蒙混层吸附能力较强，对吸附能力影响较明显；最大吸附气量与比表面积、总孔体积具有良好的正相关关系；此外，湿度、压力等外部环境也对吸附能力有一定的影响。

... 3 等温吸附特征页岩气等温吸附实验是指在同一温度下,测定不同压力条件时吸附介质对天然气的吸附体积^[21] ...

2019

0.0

... 作为页岩气及煤层气吸附特征评价的重要依据,Langmuir模型被广泛应用于天然气吸附特征评价中^[22] ...

2012

0.0

... 5 ℃/100 m的地温梯度分布区^[23,24],研究区太原组深度分布于1 614~1 709 m,以2 ...

2017

0.0

... 5 ℃/100 m的地温梯度分布区^[23,24],研究区太原组深度分布于1 614~1 709 m,以2 ...

2012

0.0

... 75%,一般认为页岩气有机质丰度下限为2%^[25] ...

2007

0.0

... 通过总有机碳含量(TOC)与兰氏体积(V_L,即最大吸附气量)相关关系图(图4)可以看出,有机碳含量越高,最大吸附气量越高,二者呈明显正相关,与前人研究认识一致^[26] ...

0.0

... 3 微观孔径页岩储层的基质孔隙远小于常规油气储层的数量级,其储层内部的这些纳米级孔隙还是页岩气的重要储存空间^[27] ...