准噶尔盆地吉木萨尔凹陷二叠系芦草沟组混积岩成因及其孔隙发育特征

王剑; 袁波; 刘金; 李勇; 李二庭; 马聪; 张宝真

doi:10.11781/sysydz202203413

准噶尔盆地吉木萨尔凹陷二叠系芦草沟组混积岩成因及其孔隙发育特征

doi: 10.11781/sysydz202203413

王剑^{1, 2, 3,},
袁波⁴,
刘金^{1, 2},
李勇³,
李二庭^{1, 2},
马聪^{1, 2},
张宝真⁵

1.
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
2.
新疆页岩油勘探开发实验室, 新疆克拉玛依 834000
3.
西南石油大学油气藏地质及开发工程国家重点实验室, 成都 610500
4.
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
5.
中国石油新疆油田公司风城作业区, 新疆克拉玛依 834000

基金项目:

国家科技重大专项 2017ZX05008-004-008

新疆维吾尔自治区重点实验室开放课题 2017D04023

详细信息

作者简介:
王剑(1984-), 男, 硕士, 高级工程师, 从事油气地质研究。E-mail: wangjian_2605@126.com

中图分类号: TE122.2
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- 被引次数: 0
出版历程
- 收稿日期: 2021-12-15
- 修回日期: 2022-03-15
- 刊出日期: 2022-05-28

Genesis and pore development characteristics of Permian Lucaogou migmatites, Jimsar Sag, Junggar Basin

WANG Jian^{1, 2, 3
,},
YUAN Bo⁴,
LIU Jin^{1, 2},
LI Yong³,
LI Erting^{1, 2},
MA Cong^{1, 2},
ZHANG Baozhen⁵

1.
Research Institute of Experiment and Detection, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China
2.
Xinjiang Key Laboratory of Shale Oil Exploration and Development, Karamay, Xinjiang 834000, China
3.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
4.
Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China
5.
Fengcheng Oilfield Operation Area, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China

摘要

摘要: 以岩性特征差异对混积岩储层孔隙成因的影响作用为主线，从岩石组构与颗粒堆积学的关系角度分析孔隙的成因和特征。研究认为：(1)基于水动力条件、矿物组合和岩石结构特征，并以碎屑颗粒、黏土矿物和碳酸盐类矿物三端元作为划分依据，芦草沟组“甜点”岩性主要有凝灰质砂屑云岩、凝灰质长石岩屑粉细砂岩、凝灰质云屑砂岩及凝灰质云质粉砂岩。混积岩主要为母源混合成因，并且垂向上各类型混积岩层可互层叠置而形成相缘混合。(2)基于颗粒的球形堆积模型，当碎屑颗粒含量低于52.4%时，孔隙度随颗粒含量的增加而减小；当碎屑颗粒含量达到52.4%时，如果碎屑颗粒含量继续增加，粒间孔隙将大量出现，孔隙度将快速增大，逐渐演变为常规的砂岩储层。(3)根据碎屑颗粒、黏土矿物和碳酸盐类矿物三种端元组分与孔隙类型的关系，芦草沟组混积岩的孔隙类型可以划分为粒间孔、粒内溶孔和晶间孔，凝灰质砂屑云岩、凝灰质长石岩屑粉细砂岩的孔隙类型以颗粒支撑的粒间孔和粒内溶孔为主，而凝灰质云屑砂岩及凝灰质云质粉砂岩以晶间孔较发育为特征。混积岩优质储层的发育主要受碎屑颗粒组分含量控制，易溶碎屑组分含量及溶蚀作用对储层物性具有改善作用。
- 混积岩 /
- 混积成因 /
- 孔隙特征 /
- 芦草沟组 /
- 吉木萨尔凹陷 /
- 准噶尔盆地
Abstract: Taking the influence of lithological characteristics differences on the genesis of pores in migmatite reservoirs as the main line, the genesis and characteristics of pores were analyzed from the perspective of the relationship between rock fabric and grain deposition. (1) Based on hydrodynamic conditions, mineral assemblage and rock structure characteristics, and taking three endmembers of clastic particles, clay minerals and carbonate minerals for classification, the "sweet spots" in the Lucaogou Formation are mainly composed of tuffaceous sandy dolomite, tuffaceous feldspar detrital siltstone, tuffaceous dolomitic sandstone and tuffaceous dolomitic siltstone. The migmatites have mixed sources, and various types of migmatite layers can be superimposed on each other vertically to form facies marginal mixing. (2) Based on the spherical accumulation model, when the content of debris particles is lower than 52.4%, the porosity decreases with the increase of particle content. When the content of clastic particles reaches 52.4%, if the content of clastic particles[JP]continues to increase, large number of ntergranular pores will appear, and the porosity will increase rapidly, gradually evolving into a conventional sandstone reservoir. (3) According to the relationship between the three end components of clastic particles, clay minerals and carbonate minerals and the pore types, the pores of the migmatites in the Lucaogou Formation can be classified into three types including intergranular pore, intragranular dissolved pore and intercrystalline pore. The pores in tuffaceous sandy dolomites and tuffaceous feldspar detrital siltstones are mainly intergranular and intragranular dissolved ones supported by particles, while those in tuffaceous dolomitic sandstones and tuffaceous dolomitic siltstones are mainly intercrystalline ones. The development of high-quality migmatite reservoirs is mainly controlled by the content of clastic particle components, and the content of soluble clastic components and dissolution effect can improve the physical properties of the reservoirs.
- migmatite /
- genesis of migmatite /
- pore characteristics /
- Lucaogou Formation /
- Jimsar Sag /
- Junggar Basin

HTML全文

图 1 准噶尔盆地吉木萨尔凹陷芦草沟组厚度等值线图(a)、连井地震剖面图(b)及地层综合柱状图(c)

Figure 1. Thickness contour map (a), cross-well seismic profile (b) and comprehensive stratigraphic histogram (c) of 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混积岩全岩矿物组成特征(a)及黏土矿物特征(b)

Figure 2. Whole rock mineral composition (a) and clay mineral characteristics (b) of migmatites 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混积岩类型及孔隙特征

a.凝灰质云屑砂岩，正交光，J10016井，3 313.74 m；b.云屑长石极细粒砂岩，单偏光，吉174井，3 114.85 m；c.云质粉砂岩，正交光，J10022井，3 477.22 m；d.长石岩屑粉砂岩，粒间孔与粒内溶孔，云质砂屑磨圆较好，单偏光，铸体薄片，J10022井，3 478.25 m；e.砂屑云岩，粒间孔，单偏光，铸体薄片，J10025井，3 532.98 m；f.白云石晶间孔，氩离子抛光+场发射扫描电镜，吉179井，3 334.89 m；g.含凝灰质砂屑云岩，凝灰质溶孔中长条形钠长石充填，单偏光，吉174井，3 164.93 m；h.长石粒内溶孔，内部板状钠长石和似蜂巢状伊/ 蒙混层矿物充填，氩离子抛光+场发射扫描电镜，J10012井，3 313.99 m；i.狭缝形伊/蒙混层矿物晶间孔，氩离子抛光+场发射扫描电镜，J10012井，3 313.97 m

Figure 3. Migmatite types and pore characteristics of Lucaogou Formation, Jimsar Sag, Junggar Basin

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图 4 准噶尔盆地吉木萨尔凹陷芦草沟组混积岩沉积模式

Figure 4. Sedimentary model of migmatites in Lucaogou Formation, Jimsar Sag, Junggar Basin

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图 5 准噶尔盆地吉木萨尔凹陷芦草沟组混积岩储层物性特征

a, b.凝灰质砂屑云岩物性分布柱状图；c, d.凝灰质长石岩屑粉细砂岩物性分布柱状图

Figure 5. Physical properties of migmatite reservoirs in Lucaogou Formation, Jimsar Sag, Junggar Basin

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图 6 不同水动力条件下颗粒分散状细粒混积岩碎屑含量变化与孔隙特征

a.碎屑含量10%，孔隙度为7.2%；b.碎屑含量20%，孔隙度为6.4%；c.碎屑含量52.4%，孔隙度为3.808%；d.碎屑含量70%，孔隙度为20%；e.碎屑含量90%，孔隙度为38.4%；f.碎屑含量100%，孔隙度为47.6%；由a至f水动力条件依次增强

Figure 6. Variation of clastic content and pore characteristics of granular dispersed fine-grained migmatites under different hydrodynamic conditions

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图 7 准噶尔盆地吉木萨尔凹陷芦草沟组混积岩储层物性与岩石组分关系

Figure 7. Relationship between physical properties and rock components of migmatite reservoirs in Lucaogou Formation, Jimsar Sag, Junggar Basin

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图 8 准噶尔盆地吉木萨尔凹陷芦草沟组成岩演化序列及孔隙演化模式

Figure 8. Diagenetic evolution sequence and pore evolution model of Lucaogou Formation, Jimsar Sag, Junggar Basin

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表 1 准噶尔盆地吉木萨尔凹陷芦草沟组主要岩性全岩X射线衍射分析

Table 1. Whole rock X-ray diffraction analysis of main lithology of Lucaogou Formation, Jimsar Sag, Junggar Basin

井号	深度/m	岩石类型	含量/%
井号	深度/m	岩石类型	石英	斜长石	钾长石	方解石	白云石	黄铁矿	黏土矿物
吉174	3 114.86	砂屑云岩	6.40	2.10			91.50
吉174	3 121.38	砂屑云岩	8.20	11.10	0.60		80.10
吉37	2 856.30	砂屑云岩	8.31	27.02		3.12	61.32		0.23
吉303	2 498.04	长石岩屑粉细砂岩	62.68	26.21	9.12				1.99
吉303	2 498.28	长石岩屑粉细砂岩	62.31	24.92	10.20				2.57
吉303	2 597.05	长石岩屑粉细砂岩	26.49	67.82			5.30		0.39
吉301	2 693.71	长石岩屑粉细砂岩	61.38	35.07					3.55
吉43	2 942.95	长石岩屑粉细砂岩	16.60	45.37	22.14	11.07	3.32		1.50
吉43	2 924.27	长石岩屑粉细砂岩	25.86	42.74	19.12	5.62	3.37		3.29
吉37	2 843.90	长石岩屑粉细砂岩	24.73	45.92	21.19		4.71		3.45
吉174	3 117.10	云屑砂岩	17.10	32.70	1.80		45.00	0.90	2.50
吉174	3 190.57	云屑砂岩	16.70	10.70	1.00	1.40	57.90	2.60	3.70
吉305	3 576.78	云屑砂岩	19.17	18.05	11.28		48.50		3.00
吉303	2 588.36	云屑砂岩	31.28	14.52	6.70		46.92		0.58
吉303	2 593.43	云屑砂岩	16.24	24.90			58.46		0.40
吉41	4 067.93	云质粉砂岩	22.57	32.26	12.90		28.17		4.10
吉41	4 066.23	云质粉砂岩	17.16	39.68	13.01		25.88		4.27
吉37	2 848.50	云质粉砂岩	23.46	48.15		3.59	18.11		5.69

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表 2 准噶尔盆地吉木萨尔凹陷芦草沟组混积岩物性特征

Table 2. Physical properties of migmatites in Lucaogou Formation, Jimsar Sag, Junggar Basin

岩性	中值压力/MPa	排驱压力/MPa	最大孔喉半径/μm	平均毛管半径/μm	0.074 μm以上孔喉占比/%	最大进汞饱和度/%
凝灰质砂屑云岩	39.7	4.4	0.51	0.16	63.8	80.6
凝灰质长石岩屑粉细砂岩	14.8	3.7	1.24	0.36	61.7	86.6
凝灰质云屑砂岩	30.4	4.3	0.48	0.14	22.0	83.6
凝灰质云质粉砂岩	27.1	4.1	0.27	0.09	38.0	80.0

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