Brittle Characteristics of Lucaogou Formation Reservoir in Jimsar Sag, Junggar Basin

doi:10.7657/XJPG20220206

Abstract

Abstract:

The lithology of the Lucaogou formation reservoirs in Jimsar sag is complex, and the rock brittleness has a significant impact on productivity. Based on the analysis of mineralogy, mechanical parameters and energy evolution characteristics, a new method for brittleness evaluation suitable for the Lucaogou formation reservoirs was proposed, which follows an analytic hierarchy process to compare the brittleness characteristics of different lithologies. The results show that the Lucaogou formation reservoir in the Jimsar sag has a low clay content and small differences in the contents of brittle minerals, so it is difficult to accurately evaluate the rock brittleness with the brittleness index; the reservoir is very heterogeneous, and the brittleness of different rocks varies greatly: the average comprehensive brittleness index of the argillaceous siltstone, sandy dolomite and mud shale is higher than 0.60, the average comprehensive brittleness index of the dolomitic siltstone and micrite dolomite is medium, ranging from 0.50 to 0.60, and the average comprehensive brittleness index of the dolomitic mudstone is relatively lower, only 0.49; for the rock samples taken from the same core, the brittleness in parallel bedding direction is larger than that in vertical bedding direction; and the development of beddings may easily lead to complex fracture patterns, which affects the brittleness evaluation results.

Key words: Jimsar sag, Lucaogou formation, reservoir, brittleness, mineral composition, mechanical parameter, energy evolution, bedding

CLC Number:

TE122

SHI Shanzhi, ZOU Yushi, WANG Junchao, ZHANG Shicheng, LI Jianmin, ZHANG Xiaohuan. Brittle Characteristics of Lucaogou Formation Reservoir in Jimsar Sag, Junggar Basin[J]. Xinjiang Petroleum Geology, 2022, 43(2): 169-176.

Figures/Tables 9

Fig. 1.

Fig. 2.

Fig. 3.

Fig. 4.

Fig. 5.

Table 1

Fig. 6.

Fig. 7.

Fig. 8.

References 28

[1]	邹才能, 潘松圻, 荆振华, 等. 页岩油气革命及影响[J]. 石油学报, 2020, 41(1):1-12.
	ZOU Caineng, PAN Songqi, JING Zhenhua, et al. Shale oil and gas revolution and its impact[J]. Acta Petrolei Sinica, 2020, 41(1):1-12.
[2]	聂海宽, 何发岐, 包书景. 中国页岩气地质特殊性及其勘探对策[J]. 天然气工业, 2011, 31(11):111-116.
	NIE Haikuan, HE Faqi, BAO Shujing. Peculiar geological characteristics of shale gas in China and its exploration countermeasures[J]. Natural Gas Industry, 2011, 31(11):111-116.
[3]	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.
[4]	张文文, 韩长城, 田继军, 等. 吉木萨尔凹陷二叠系芦草沟组层序地层划分及演化特征[J]. 岩性油气藏, 2021, 33(5):45-58.
	ZHANG Wenwen, HAN Changcheng, TIAN Jijun, et al. Sequence stratigraphy division and evolutionary features of Permian Lucaogou formation in Jimsar sag[J]. Lithologic Reservoirs, 2021, 33(5):45-58.
[5]	杨智, 侯连华, 林森虎, 等. 吉木萨尔凹陷芦草沟组致密油、页岩油地质特征与勘探潜力[J]. 中国石油勘探, 2018, 23(4):76-85.
	YANG Zhi, HOU Lianhua, LIN Senhu, et al. Geologic characteristics and exploration potential of tight oil and shale oil in Lucaogou formation in Jimsar sag[J]. China Petroleum Exploration, 2018, 23(4):76-85.
[6]	支东明, 唐勇, 杨智峰, 等. 准噶尔盆地吉木萨尔凹陷陆相页岩油地质特征与聚集机理[J]. 石油与天然气地质, 2019, 40(3):524-534.
	ZHI Dongming, TANG Yong, YANG Zhifeng, et al. Geological characteristics and accumulation mechanism of continental shale oil in Jimusaer sag,Junggar basin[J]. Oil & Gas Geology, 2019, 40(3):524-534.
[7]	曹元婷, 潘晓慧, 李菁, 等. 关于吉木萨尔凹陷页岩油的思考[J]. 新疆石油地质, 2020, 41(5):622-630.
	CAO Yuanting, PAN Xiaohui, LI Jing, et al. Discussion on shale oil in Jimsar sag,Junggar basin[J]. Xinjiang Petroleum Geology, 2020, 41(5):622-630.
[8]	王然, 常秋生, 钱永新, 等. 准噶尔盆地吉木萨尔凹陷芦草沟组页岩油“甜点体”储集特征及成因机理[J]. 石油实验地质, 2020, 42(4):604-611.
	WANG Ran, CHANG Qiusheng, QIAN Yongxin, et al. Reservoir characteristics and genesis of shale oil “sweet spots” in Lucaogou formation,Jimsar sag,Junggar basin[J]. Petroleum Geology & Experiment, 2020, 42(4):604-611.
[9]	马聪, 王剑, 潘晓慧, 等. 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[J]. 石油实验地质, 2020, 42(4):596-603.
	MA Cong, WANG Jian, PAN Xiaohui, et al. Origin and significance of “sweet spots” of analcites in shale oil reservoirs in Permian Lucaogou formation,Jimsar sag,Junggar basin[J]. Petroleum Geology & Experiment, 2020, 42(4):596-603.
[10]	李晶晶, 孙国翔, 刘琦, 等. 吉木萨尔凹陷芦一段页岩储集层孔隙结构及敏感性[J]. 新疆石油地质, 2021, 42(5):541-547.
	LI Jingjing, SUN Guoxiang, LIU Qi, et al. Pore structure and sensitivity of shale reservoir in Lu 1 member of Jimsar sag[J]. Xinjiang Petroleum Geology, 2021, 42(5):541-547.
[11]	秦晓艳, 王震亮, 于红岩, 等. 基于岩石物理与矿物组成的页岩脆性评价新方法[J]. 天然气地球科学, 2016, 27(10):1 924-1 932.
	QIN Xiaoyan, WANG Zhenliang, YU Hongyan, et al. A new shale brittleness evaluation method based on rock physics and mineral compositions[J]. Natural Gas Geoscience, 2016, 27(10):1 924-1 932.
[12]	梁成钢, 谢建勇, 陈依伟, 等. 吉木萨尔凹陷芦草沟组页岩储集层裂缝成因及耦合关系[J]. 新疆石油地质, 2021, 42(5):521-528.
	LIANG Chenggang, XIE Jianyong, CHEN Yiwei, et al. Genesis and coupling relationship of fractures in shale reservoir of Lucaogou formation in Jimsar sag,Junggar basin[J]. Xinjiang Petroleum Geology, 2021, 42(5):521-528.
[13]	李庆辉, 陈勉, 金衍, 等. 页岩脆性的室内评价方法及改进[J]. 岩石力学与工程学报, 2012, 31(8):1 680-1 685.
	LI Qinghui, CHEN Mian, JIN Yan, et al. Indoor evaluation method for shale brittleness and improvement[J]. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(8):1 680-1 685.
[14]	TARASOV B, POTVIN Y. Universal criteria for rock brittleness estimation under triaxial compression[J]. International Journal of Rock Mechanics & Mining Sciences, 2013, 59:57-69.
[15]	AI Chi, ZHANG Jun, LI Yuwei, et al. Estimation criteria for rock brittleness based on energy analysis during the rupturing process[J]. Rock Mechanics and Rock Engineering, 2016, 49:4 681-4 698. doi: 10.1007/s00603-016-1078-x
[16]	ZHANG Jun, AI Chi, LI Yuwei, et al. Energy-based brittleness index and acoustic emission characteristics of anisotropic coal under triaxial stress condition[J]. Rock Mechanics and Rock Engineering, 2018, 51:3 343-3 360. doi: 10.1007/s00603-018-1535-9
[17]	KIVI I R, AMERI M, MOLLADAVOODI H. Shale brittleness evaluation based on energy balance analysis of stress-strain curves[J]. Journal of Petroleum Science and Engineering, 2018, 167:1-19. doi: 10.1016/j.petrol.2018.03.061
[18]	JARVIE D M, HILL R J, RUBLE T E, et al. Unconventional shale-gas systems:the Mississippian Barnett shale of north-central Texas as one model for thermogenic shale-gas assessment[J]. AAPG Bulletin, 2007, 91(4):475-499. doi: 10.1306/12190606068
[19]	WANG F P, GALE J F W. Screening criteria for shale-gas systems[J]. Gulf Coast Association of Geological Societies Transactions, 2009, 59:779-793.
[20]	李钜源. 东营凹陷泥页岩矿物组成及脆度分析[J]. 沉积学报, 2013, 31(4):616-620.
	LI Juyuan. Analysis on mineral components and frangibility of shales in Dongying depression[J]. Acta Sedimentologica Sinica, 2013, 31(4):616-620.
[21]	RICKMAN R, MULLEN M, PETRE E, et al. A practical use of shale petrophysics for stimulation design optimization:all shale plays are not clones of the Barnett shale[R]. SPE 115258, 2008.
[22]	LI Yuwei, JIA Dan, RUI Zhenhua, et al. Evaluation method of rock brittleness based on statistical constitutive relations for rock damage[J]. Journal of Petroleum Science and Engineering, 2017, 153:123-132. doi: 10.1016/j.petrol.2017.03.041
[23]	LI Ning, ZOU Yushi, ZHANG Shicheng, et al. Rock brittleness evaluation based on energy dissipation under triaxial compression[J]. Journal of Petroleum Science and Engineering, 2019, 183:1-10.
[24]	张一帆, 查明, 丁修建, 等. 吉木萨尔凹陷芦草沟组页岩含油性评价及控制因素[J]. 新疆地质, 2021, 39(2):297-301.
	ZHANG Yifan, ZHA Ming, DING Xiujian, et al. Evaluation and controlling factors of shale oil bearing properties of Permian Lucaogou formation in Jimsar depression[J]. Xinjiang Geology, 2021, 39(2):297-301.
[25]	李国欣, 毛锐, 王振林, 等. 具有埋深校正的岩石静态脆性指数计算方法:以吉木萨尔凹陷二叠系芦草沟组为例[J]. 新疆石油地质, 2018, 39(5):603-608.
	LI Guoxin, MAO Rui, WANG Zhenlin, et al. A rock static brittleness index calculation method considering burial depth correction:a case study of Permian Lucaogou formation in Jimsar sag[J]. Xinjiang Petroleum Geology, 2018, 39(5):603-608.
[26]	郭旭光, 何文军, 杨森, 等. 准噶尔盆地页岩油“甜点区”评价与关键技术应用:以吉木萨尔凹陷二叠系芦草沟组为例[J]. 天然气地球科学, 2019, 30(8):1 168-1 179.
	GUO Xuguang, HE Wenjun, YANG Sen, et al. Evaluation and application of key technologies of “sweet area”of shale oil in Junggar basin:case study of Permian Lucaogou formation in Jimusar depression[J]. Natural Gas Geoscience, 2019, 30(8):1 168-1 179.
[27]	李国欣, 刘国强, 侯雨庭, 等. 陆相页岩油有利岩相优选与压裂参数优化方法[J]. 石油学报, 2021, 42(11):1 405-1 416.
	LI Guoxin, LIU Guoqiang, HOU Yuting, et al. Optimization method of favorable lithofacies and fracturing parameter for continental shale oil[J]. Acta Petrolei Sinica, 2021, 42(11):1 405-1 416.
[28]	邓雪, 李家铭, 曾浩健, 等. 层次分析法权重计算方法分析及其应用研究[J]. 数学的实践与认识, 2012, 42(7):93-100.
	DENG Xue, LI Jiaming, ZENG Haojian, et al. Research on computation methods of AHP weight vector and its applications[J]. Mathematics in Practice and Theory, 2012, 42(7):93-100.