吉木萨尔凹陷芦草沟组页岩油储集层渗吸规律

doi:10.7657/XJPG20210608

新疆石油地质 ›› 2021, Vol. 42 ›› Issue (6): 702-708.doi: 10.7657/XJPG20210608

吉木萨尔凹陷芦草沟组页岩油储集层渗吸规律

马明伟¹(), 祝健², 李嘉成¹, 廖凯³(), 王俊超¹, 王飞²

1.中国石油新疆油田分公司工程技术研究院,新疆克拉玛依 834000
2.中国石油大学（北京）石油工程学院,北京 102249
3.中国石油大学（北京）克拉玛依校区石油学院,新疆克拉玛依 834000

收稿日期:2021-06-07 修回日期:2021-08-11 出版日期:2021-12-01 发布日期:2022-09-27
通讯作者: 廖凯 E-mail:mamingwei@petrochina.com.cn;2020592108@cupk.edu.cn
作者简介:马明伟（1990-）,男,陕西汉中人,助理工程师,硕士,油气田开发,（Tel）15881129926（E-mail） mamingwei@petrochina.com.cn
基金资助:
国家自然科学基金(51974332)

Imbibition Law of Shale Oil Reservoirs in the Lucaogou Formation in Jimsar Sag

MA Mingwei¹(), ZHU Jian², LI Jiacheng¹, LIAO Kai³(), WANG Junchao¹, WANG Fei²

1. Research Institute of Engineering Technology, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China
2. School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
3. School of Petroleum, Karamay Campus, China University of Petroleum (Beijing), Karamay, Xinjiang 834000, China

Received:2021-06-07 Revised:2021-08-11 Online:2021-12-01 Published:2022-09-27
Contact: LIAO Kai E-mail:mamingwei@petrochina.com.cn;2020592108@cupk.edu.cn

摘要/Abstract

摘要：

吉木萨尔凹陷芦草沟组发育中—低孔、低—特低渗源储一体页岩油藏。油藏利用水平井密切割、高强度体积压裂技术进行开发。压裂后长期关井,压裂液返排率低,产油量高;短期关井,压裂液返排率高,但产油量较低。为厘清压裂后焖井期间压裂液渗吸置换规律,利用接触角对储集层润湿性进行评价,并利用岩心样品结合核磁共振技术进行自发渗吸实验,确定该地区储集层压裂液渗吸置换能力。结果表明：吉木萨尔凹陷芦草沟组上甜点和下甜点储集层润湿性差异较大,与渗吸置换能力关系密切,上甜点储集层具亲水性,小孔隙在渗吸过程中占主导,渗吸初期为快速渗吸阶段,160 h左右达到渗吸平衡,平均渗吸采收率为31%;下甜点储集层具亲油性,大孔隙在渗吸过程中占主导,渗吸速度均较低,400 h左右达到渗吸平衡,平均渗吸采收率为22%。因此,上甜点储集层可适当延长焖井时间,下甜点储集层可优选具有表面活性剂的压裂液,以充分发挥压后焖井期间渗吸置换作用,提高页岩油藏的采收率。

关键词: 吉木萨尔凹陷, 芦草沟组, 页岩油, 润湿性, 渗吸置换, 渗吸效率, 渗吸速率

Abstract:

Shale oil reservoirs with middle-low porosity and low-ultra-low permeability are present in the Lucaogou formation in Jimsar sag, and the reservoirs are also the source rocks. These oil reservoirs have been developed with dense horizontal wells and high-strength volume fracturing stimulation. In the case of a long-term well shut-in after fracturing, the flowback rate of fracturing fluid is low, but the oil production is high. In comparison, in the case of a short-term well shut-in, the flowback rate of fracturing fluid is high, but the oil production is low. In order to understand the law of fracturing fluid imbibition and replacement during the soaking period after fracturing, the reservoir wettability was evaluated using contact angle, and the spontaneous imbibition experiment was carried out using real downhole cores and NMR. The results show that the wettabilities of the upper sweet spot interval and the lower sweet spot interval in the Lucaogou formation in Jimsar sag are quite different, which are closely related to the imbibition and displacement capacities. The upper sweet spot interval is hydrophilic, where small pores are dominant during the imbibition process. Initial imbibition is a rapid process and reaches equilibrium after about 160 h, and the average imbibition recovery is 31%. The lower sweet spot interval is lipophilic, where large pores are dominant during the imbibition process. The imbibition rate is slow and reaches equilibrium after about 400 h, and the average imbibition recovery is 22%. It is proposed to appropriately extend soaking time for the upper sweet spot interval, and choose fracturing fluid with surfactants for the lower sweet spot interval, so as to give full play to imbibition and displacement to improve the recovery of the shale oil reservoirs.

Key words: Jimsar sag, Lucaogou formation, shale oil, wettability, imbibition and displacement, imbibition efficiency, imbibition rate

中图分类号:

TE122.23

马明伟, 祝健, 李嘉成, 廖凯, 王俊超, 王飞. 吉木萨尔凹陷芦草沟组页岩油储集层渗吸规律[J]. 新疆石油地质, 2021, 42(6): 702-708.

MA Mingwei, ZHU Jian, LI Jiacheng, LIAO Kai, WANG Junchao, WANG Fei. Imbibition Law of Shale Oil Reservoirs in the Lucaogou Formation in Jimsar Sag[J]. Xinjiang Petroleum Geology, 2021, 42(6): 702-708.

图/表 7

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岩心样品编号	岩心直径/ cm	岩心长度/ cm	层位	岩性	孔隙度/ %	渗透率/ mD	含油性
1号 2号 3号	2.5	3.3	P₂l2-32	灰色白云质粉砂岩	9.8	0.016 5	油迹
	2.5	3.3	P₂l2-22	深灰色泥岩	6.4	0.002 9	荧光
	2.5	3.3	P₂l2-12	灰黑色泥岩	7.3	0.008 2	荧光
4号 5号 6号	2.6	3.1	P₂l2-31	灰色泥质粉砂岩	13.0	0.008 4	油侵
	2.6	3.2	P₂l2-21	深灰色石灰质泥岩	15.0	0.037 8	油斑
	2.6	3.1	P₂l2-31	灰色泥质粉砂岩	13.0	0.009 6	油侵

吉木萨尔凹陷芦草沟组页岩油储集层渗吸规律

Imbibition Law of Shale Oil Reservoirs in the Lucaogou Formation in Jimsar Sag

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