准噶尔盆地吉木萨尔凹陷芦草沟组页岩油储层方沸石成因与甜点意义

马聪; 王剑; 潘晓慧; 陈俊; 尚玲; 刘金

doi:10.11781/sysydz202004596

准噶尔盆地吉木萨尔凹陷芦草沟组页岩油储层方沸石成因与甜点意义

doi: 10.11781/sysydz202004596

马聪^{1, 2,},
王剑^{1, 2},
潘晓慧³,
陈俊^{1, 2},
尚玲^{1, 2},
刘金^{1, 2}

1.
新疆页岩油勘探开发重点实验室, 新疆克拉玛依 834000
2.
中国石油新疆油田分公司实验检测研究院, 新疆克拉玛依 834000
3.
中国石油新疆油田分公司勘探开发研究院, 新疆克拉玛依 834000

基金项目:

国家科技重大专项 2017ZX05001002

中国石油科技重大专项 2017E-0401

详细信息

作者简介:
马聪(1989-), 女, 硕士, 工程师, 从事地质实验研究。E-mail: macong66@petrochina.com.cn

中图分类号: TE122.1
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- 被引次数: 0
出版历程
- 收稿日期: 2020-01-09
- 修回日期: 2020-06-05
- 刊出日期: 2020-07-28

Origin and significance of "sweet spots" of analcites in shale oil reservoirs in Permian Lucaogou Formation, Jimsar Sag, Junggar Basin

MA Cong^{1, 2
,},
WANG Jian^{1, 2},
PAN Xiaohui³,
CHEN Jun^{1, 2},
SHANG Ling^{1, 2},
LIU Jin^{1, 2}

1.
Xinjiang Key Laboratory of Shale Oil Exploration and Development, Karamay, Xinjiang 834000, China
2.
Experimental Testing Institute of Xinjiang Oilfield Branch Company, PetroChina, Karamay, Xinjiang 834000, China
3.
Exploration and Exploitation Institute of Xinjiang Oilfield Branch Company, PetroChina, Karamay, Xinjiang 834000, China

摘要

摘要: 准噶尔盆地吉木萨尔凹陷二叠系芦草沟组页岩油储层中普遍发育方沸石，且与甜点段对应好，展示出“示烃矿物意义”。为全面深入了解方沸石对页岩油甜点的意义，采用偏光显微镜、全岩X衍射成分分析、电子探针BSE图像分析及矿物能谱分析等手段，对方沸石的岩石学和矿物学特征进行了综合研究，再结合地质背景探讨了成因及意义。吉木萨尔凹陷芦草沟组方沸石主要赋存于沉凝灰岩、碳酸盐岩质凝灰岩中，个别出现在凝灰质白云岩中，而方沸石岩极为少见。方沸石在岩石中的赋存状态包括纹层状、球粒状、块状、脉状。方沸石形成于高盐度、碱性、低温的热液条件下，埋藏过程中碱性长石及部分蒙脱石类黏土成岩转化形成自生方沸石；火山喷发活跃期火山物质经过热反应与蚀变形成次生方沸石。成岩早期形成的大量方沸石胶结物起到了抗压实作用进而保护原生孔，也为成岩中后期次生溶孔的形成提供物质基础，大幅提升了页岩油层的储集性能，因而方沸石富集段与页岩油甜点段对应良好。
- 页岩油 /
- 方沸石 /
- 次生溶孔 /
- 芦草沟组 /
- 吉木萨尔凹陷 /
- 准噶尔盆地
Abstract: As a hydrocarbon indicating mineral, analcite was always found in shale oil reservoirs and has good correspondence with "sweet spots" in the Lucaogou Formation, Jimsar Sag, Junggar Basin. The petrographic and mineralogical characteristics as well as geologic origins of analcite were studied using a polarized light microscope, whole rock XRD analysis, electron probe BSE image analysis and mineral energy spectrum, in order to discuss its significance for shale oil "sweet spots". The analcite is mainly found in sedimentory tuff and carbonate tuff with some in tuff dolomite, and the analcite rock is very rare. The occurrence of analcite in rocks is lamellar, granular, massive and vein-shaped. Analcite was formed in high salinity, alkaline, low temperature hydrothermal conditions. The diagenetic transformation of non-volcanic material during burial forms authigenic analcite. Secondary analcite was formed by reaction and dissolution of volcanic material and hydrothermal during volcanic jetting. Analcite cements in the early diagenesis protected native porosity, and afforded the formation of secondary solution pores during mid and late diagenesis which has a good correspondence with shale oil "sweet spots".
- shale oil /
- analcite /
- secondary dissolved pore /
- Lucaogou Formation /
- Jimsar Sag /
- Junggar Basin

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图 1 准噶尔盆地吉木萨尔凹陷芦草沟组页岩油勘探现状示意

Figure 1. Shale oil exploration status in Lucaogou Formation, Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 2 准噶尔盆地吉木萨尔凹陷芦草沟组含油段岩心照片及显微镜下岩石学特征

a.吉35井，P₂l₁，白云岩夹凝灰岩纹层，岩心照片；b.吉174井，P₂l₁，含凝灰质泥晶白云岩中富含藻类纹层，荧光显微镜下照片；c.吉302井，P₂l₁，碳酸盐岩质凝灰岩中方解石脉清晰可见；d.吉301井，P₂l₁，沉凝灰岩岩心照片；e.为d对应的荧光显微照片，显示凝灰物质含油性好；f.吉176井，P₂l₂，安山质凝灰岩中晶屑和基质见强烈的溶蚀港湾，铸体薄片显微镜下照片

Figure 2. Photographs of cores and photomicrographs of petrographic features in the oil-bearing section in Lucaogou Formation, Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 3 准噶尔盆地吉木萨尔凹陷芦草沟组方沸石显微岩石学特征

a.吉37井，2 852.13 m，方沸石呈纹层状富集，与白云石互层，单偏光；b.a对应的正交偏光图像；c.吉174井，3 203.85 m，方沸石质岩，岩石中球粒方沸石被白云石环绕，单偏光；d.吉31井，2 717.14 m，方沸石质白云岩中方沸石近乎悬浮于白云石中，正交偏光下加入石膏试板；e.吉174井，3 202.3 m，球粒方沸石与黏土矿物，单偏光；f.为e中黄色线框区域放大图像，电子探针背散射图像；g.为f中黄色线框区域放大图像，方沸石内部可见“交代残余”的正长石，方沸石悬浮于蒙脱石基底中，电子探针背散射图像；h.吉31井，2 894.28 m，方沸石被溶蚀后的溶孔，铸体薄片显微镜下图像；i.吉31井，2 721.5 m，云质沉凝灰岩中见方沸石脉体，脉体边缘见共生白云石，荧光显微镜下图像。Anl.方沸石，Dol.白云石，Clay.黏土矿物，Mnt.蒙脱石，Or.正长石

Figure 3. Photomicrographic features of analcite from Lucaogou Formation, Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 4 准噶尔盆地吉木萨尔凹陷芦草沟组含方沸石层段矿物含量

Figure 4. Mineral contents of analcite-containing intervals in Lucaogou Formation, Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 5 准噶尔盆地吉木萨尔凹陷芦草沟组方沸石含量与黏土矿物(a)、斜长石(b)含量关系

Figure 5. Relationship among analcite, anorthose and clay contents in Lucaogou Formation, Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 6 准噶尔盆地吉木萨尔凹陷吉31井芦草沟组测井综合柱状图

Figure 6. Logging profile of Lucaogou Formation in well Ji 31, Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 7 准噶尔盆地吉木萨尔凹陷吉174井芦草沟组方沸石含量与孔隙度关系

Figure 7. Relationship between analcite content and porosity in Lucaogou Formation, well Ji 174, Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

表 1 准噶尔盆地吉木萨尔凹陷芦草沟组方沸石电子探针化学组分

Table 1. Chemical components of analcite by electronic-probe, Lucaogou Formation, Jimsar Sag, Junggar Basin

样号	化学组分含量/%											Si/Al
样号	K₂O	CaO	TiO₂	P₂O₅	Na₂O	Al₂O₃	MgO	SiO₂	MnO	FeO	总	Si/Al
36-Anl-05	0.04	0.01	0.00	0.03	6.78	20.20	0.01	65.02	0.00	0.11	92.19	2.73
36-Anl-08	0.22	0.03	0.00	0.00	8.54	20.93	0.04	62.00	0.04	0.11	91.91	2.51
36-Anl-09	0.63	0.03	0.02	0.01	7.44	21.59	0.18	59.67	0.00	0.30	91.91	2.34
38-An-04	0.05	0.01	0.01	0.00	7.12	20.80	0.00	65.04	0.00	0.11	93.13	2.65
38-Anl-05	0.02	0.00	0.01	0.02	8.26	20.88	0.00	63.47	0.00	0.19	92.85	2.58
平均	0.19	0.02	0.01	0.01	7.63	20.88	0.05	63.04	0.01	0.16	92.40	2.56

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