准噶尔盆地吉174井芦草沟组页岩油地质剖面分析

doi:10.13809/j.cnki.cn32-1825/te.2022.01.017

摘要/Abstract

摘要：

吉174井是准噶尔盆地吉木萨尔凹陷芦草沟组页岩油储层取心最长、资料最多的探井,其“铁柱子”的建立对于页岩油纵向特征的研究具有重要意义。研究发现：储层岩性以碎屑岩和碳酸岩混杂的过渡岩性为主,纵向变化快;岩相反映向上水体逐渐增深的半深—深湖相沉积环境;储层平均孔隙度为11.1 %,平均渗透率为0.056 ×10^-3μm²,属于中—低孔、低渗—特低渗储层;储层白云石和砂质含量与物性、含油性呈正相关;发育上、下2套甜点体,上“甜点”储集层岩性主要为砂屑云岩,发育溶蚀孔发育型储集空间,厚度为24 m;下“甜点”储集层岩性主要为粉细砂岩、云屑砂岩和云质粉砂岩,储集空间主要为裂缝—孔隙型,厚度35 m;2套甜点体有利区面积为1 299 km²,展现芦草沟组页岩油具备规模勘探潜力。

关键词: 页岩油, 甜点体, 地质特征, 芦草沟组, 准噶尔盆地

Abstract:

Well-Ji-174 is an exploration well with the longest core extraction and the most data in the shale oil reservoir of Lucaogou Formation in Jimusar sag, Junggar Basin. The establishment of the “iron pillar” is of great significance to the studies of the shale oil longitudinal characteristics. It is found that the lithology of reservoir is mainly transitional lithology mixed with clastic rock and carbonate rock, and changes quickly in the longitudinal direction. The lithofacies reflects the semi-deep to deep lacustrine sedimentary environment with gradually deepening upward water body. The average porosity and permeability of the reservoir are 11.1 % and 0.056×10^-3 μm², respectively, which make the reservoir presents the characteristics of medium-low porosity, low-permeability and ultra-low permeability. The dolomite and sand content of the reservoir are positively correlated with the physical property and oil content. The upper and lower sweet spots are developed. The main lithology of the upper sweet spot is clastic dolomite, allowing the formation of the reservoir space with developed dissolution pores and a thickness of 24 m. The main lithology of the lower one is fine siltstone, dolomite sandstone and dolomite siltstone, whose reservoir space with thickness of 35 m is mostly fissures and pores. The favorable area of these two sweet spots covers an area of 1 299 km², indicating that the shale oil in Lucaogou Formation has large-scale exploration potential.

Key words: shale oil, sweet spot, geological characteristics, Lucaogou Formation, Junggar Basin

中图分类号:

TE121

王然,何文军,赵辛楣等. 准噶尔盆地吉174井芦草沟组页岩油地质剖面分析[J]. 油气藏评价与开发, 2022, 12(1): 192-203.

Ran WANG,Wenjun HE,Xinmei ZHAO, et al. Geological section analysis of shale oil in Lucaogou Formation of Well-Ji-174, Junggar Basin[J]. Reservoir Evaluation and Development, 2022, 12(1): 192-203.

图/表 8

图1

图2

图3

图4

图5

图6

图7

图8

参考文献 17

[1]	YANG SU Y, MING ZHA M, DING X J, et al. Petrographic, palynologic and geochemical characteristics of source rocks of the Permian Lucaogou Formation in Jimsar Sag, Junggar Basin, NW China: Origin of organic matter input and depositional environments[J]. Journal of Petroleum Science and Engineering, 2019, 183.
[2]	DING X J, QU J X, IMIN A, et al. Organic matter origin and accumulation in tuffaceous shale of the lower Permian Lucaogou Formation, Jimsar Sag[J]. Journal of Petroleum Science and Engineering, 2019, 179.
[3]	WANG J, CAO Y C, LIU K Y, et al. Fractal characteristics of the pore structures of fine-grained, mixed sedimentary rocks from the Jimsar Sag, Junggar Basin: Implications for lacustrine tight oil accumulations[J]. Journal of Petroleum Science and Engineering, 2019, 182.
[4]	YANG Y Q, QIU L W, WAN M, et al. Depositional model for a salinized lacustrine basin: The Permian Lucaogou Formation, Jimsar Sag, Junggar Basin, NW China[J]. Journal of Asian Earth Sciences, 2019, 178.
[5]	ZHA M, WANG S, DING X J, et al. Tight oil accumulation mechanisms of the Lucaogou Formation in the Jimsar Sag, NW China: Insights from pore network modeling and physical experiments[J]. Journal of Asian Earth Sciences, 2019, 178.
[6]	邹才能, 陶士振, 杨智, 等. 中国非常规油气勘探与研究新进展[J]. 矿物岩石地球化学通报, 2012, 31(4):312-322.
	ZOU Caineng, TAO Shizhen, YANG Zhi, et al. New advance in unconventional petroleum exploration and research in China[J]. Bulletin of Mineralogy, Petrology and Geochenmistry, 2012, 31(4):312-322.
[7]	贾承造, 郑民, 张永峰. 中国非常规油气资源与勘探开发前景[J]. 石油勘探与开发, 2012, 39(2):129-136.
	JIA Chengzao, ZHENG Min, ZHANG Yongfeng. Unconventional hydrocarbon resources in China and the prospect of exploration and development[J]. Petroleum Exploration and Development, 2012, 39(2):129-136.
[8]	张功成, 陈新发, 刘楼军, 等. 准噶尔盆地结构构造与油气田分布[J]. 石油学报, 1999, 20(1):13-18.
	ZHANG Gongcheng, CHEN Xinfa, LIU Loujun, et al. Structure and gas field distribution in Junggar basin[J]. Acta Petrolei Sinica, 1999, 20(1):13-18.
[9]	何登发, 陈新发, 张义杰, 等. 准噶尔盆地油气富集规律[J]. 石油学报, 2004, 25(3):1-10.
	HE Dengfa, CHEN Xinfa, ZHANG Yijie, et al. Enrichement charac-teristics of oil and gas in Junggar basin[J]. Acta Petrolei Sinica, 2004, 25(3):1-10.
[10]	马克, 刘钰铭, 侯加根, 等. 陆相咸化湖混合沉积致密储集层致密化机理——以吉木萨尔凹陷二叠系芦草沟组为例[J]. 新疆石油地质, 2019, 40(3):253-261.
	MA Ke, LIU Yuming, HOU Jiagen, et al. Densification mechanism of tight reservoirs from mixed sedimentation in saline lacustrine environment: A case study of Permian Lucaogou Formation, Jimsar sag[J]. Xinjiang Petroleum Geology, 2019, 40(3):253-261.
[11]	李书琴, 印森林, 高阳, 等. 准噶尔盆地吉木萨尔凹陷芦草沟组混合细粒岩沉积微相[J]. 天然气地球科学, 2020, 31(2):235-249.
	LI Shuqin, YIN Senlin, GAO Yang, et al. Study on sedimentary microfacies of mixed fine-grained rocks in Lucaogou Formation, Jimsar Sag, Junggar Basin[J]. Natural Gas Geoscience, 2020, 31(2):235-249.
[12]	蔡忠贤, 陈发景, 贾振远. 准噶尔盆地的类型和构造演化[J]. 地学前缘, 2000, 7(4):431-440.
	CAI Zhongxian, CHEN Fajing, JIA Zhenyuan. Types and tectonic evolution of Junggar basin[J]. Earth Science Frontiers, 2000, 7(4):431-440.
[13]	马铨峥, 杨胜来, 杨龙, 等. 准噶尔盆地吉木萨尔凹陷芦草沟组致密储层微观孔隙特征[J]. 大庆石油地质与开发, 2020, 39(6):13-20.
	MA Quanzheng, YANG Shenglai, YANG Long, et al. Characteristics of the micro-pore in Lucaogou Formation tight reservoir of Jimsar Sag, Junggar Basin[J]. Petroleum Geology & Oilfield Development in Daqing, 2020, 39(6):13-20.
[14]	葸克来, 操应长, 朱如凯, 等. 吉木萨尔凹陷二叠系芦草沟组致密油储集层岩石类型及特征[J]. 石油学报, 2015, 36(12):1495-1507.
	XI Kelai, CAO Yingchang, ZHU Rukai, et al. Rock types and characteristics of tight oil reservoir in Permian Lucaogou Formation, Jimsar Sag[J]. Acta Petrolei Sinica, 2015, 36(12):1495-1507.
[15]	胡文瑄, 吴海光, 王小林. 准噶尔盆地吉木萨尔凹陷二叠系芦草沟组致密油储集层岩性与孔隙特征[J]. 高校地质学报, 2013, 19(S1):542-544.
	HU Wenxuan, WU Haiguang, WANG Xiaolin. Lithology and pores characteristics of tight oil reservoir in Permian Lucaogou Formation, Jimsar Sag, Junggar Basin[J]. Geological Journal of China Universities, 2013, 19(S1):542-544.
[16]	匡立春, 胡文瑄, 王绪龙, 等. 吉木萨尔凹陷芦草沟组致密油储集层初步研究:岩性与孔隙特征分析[J]. 高校地质学报, 2013, 19(3):529-535.
	KUANG Lichun, HU Wenxuan, WANG Xulong, et al. Research of the tight oil reservoir in the Lucaogou Formation in Jimusar sag: Analysis of lithology and porosity characteristics[J]. Geological Journal of China Universities, 2013, 19(3):529-535.
[17]	王剑, 周路, 刘金, 等. 准噶尔盆地吉木萨尔凹陷二叠系芦草沟组酸碱交替成岩作用特征及对页岩储集层的影响[J]. 石油勘探与开发, 2020, 47(5):898-912.
	WANG Jian, ZHOU Lu, LIU Jin, et al. Acid-base alternation diagenesis and its influence on shale reservoirs in the Permian Lucaogou Formation, Jimusar Sag, Junggar Basin, NW China[J]. Petroleum Exploration and Development, 2020, 47(5):898-912.