安塞油田长6段特低渗油藏水驱特征

doi:10.7657/XJPG20250312

摘要/Abstract

摘要：

为了解安塞油田长6段特低渗油藏的水驱波及状况和水洗特征，在WY区W16-15井不同方位系统部署9口密闭取心检查井，利用录井、扫描电镜等资料，分析储集层的水洗特征、波及程度和微观变化特征。结果表明：强水洗段主要为长61-21 小层中物性较好层段，而物性较差的长61-31 小层弱水洗或未水洗；油水井方位与主应力方向夹角越小或与注水井距离越近，水洗程度越高，且水洗厚度越大；检查井组长6₁亚段纵向波及系数为0.51，原井组计算波及系数为0.55，吻合度较高；长6段储集层中水洗段和强水洗段在注入水长期冲刷下，黏土矿物发生运移和膨胀，造成储集层微观非均质性增强。

关键词: 安塞油田, 长6段, 特低渗油藏, 水驱特征, 水洗程度, 波及系数, 储集层, 微观特征

Abstract:

To understand the sweep efficiency and water washing behaviors during waterflooding of extra-low permeability reservoirs in the Chang 6 member of the Ansai oilfield, 9 sealed coring inspection wells were systematically deployed at different orientations around Well W16-15 in the WY block. Using logging and scanning electron microscopy (SEM) data, the water washing behaviors, sweep efficiency, and microstructural changes in the reservoir were examined. The results show that the Chang 61-21 sublayer with good physical properties is strongly water washed, whereas the Chang 61-31 sublayer with poor physical properties is weakly or not water washed. The smaller the angle between the producer orientation and the principal stress direction or the closer to the injector, the greater the water washing degree and the water-washed reservoir thickness. The vertical sweep efficiency of the inspection well group in Chang 6₁ is 0.51, closely matching the calculated sweep efficiency (0.55) of the original well group. In the medium water-washed and strongly water-washed intervals of Chang 6 reservoir, long-term washing by injected water leads to the migration and swelling of clay minerals, enhancing the reservoir heterogeneity.

Key words: Ansai oilfield, Chang 6 member, extra-low permeability reservoir, waterflooding characteristic, water washing degree, sweep efficiency, reservoir, microscopic characteristic

中图分类号:

TE331

段文标, 张永强, 高春宁, 张洁, 王靖华, 周晋, 张传保, 曾山. 安塞油田长6段特低渗油藏水驱特征[J]. 新疆石油地质, 2025, 46(3): 353-359.

DUAN Wenbiao, ZHANG Yongqiang, GAO Chunning, ZHANG Jie, WANG Jinghua, ZHOU Jin, ZHANG Chuanbao, ZENG Shan. Waterflooding Characteristics of Extra-Low Permeability Reservoirs in Chang 6 Member, Ansai Oilfield[J]. Xinjiang Petroleum Geology, 2025, 46(3): 353-359.

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参考文献 18

[1]	王翔, 张贵才, 蒋平, 等. 计算注水开发不同阶段体积波及系数的新方法[J]. 油气地质与采收率, 2024, 31(1):145-152.
	WANG Xiang, ZHANG Guicai, JIANG Ping, et al. A new method for calculating volume sweep coefficient at different stages of water injection development[J]. Petroleum Geology and Recovery Efficiency, 2024, 31(1):145-152.
[2]	石兰香, 唐文军, 周游, 等. 稠油自乳化水驱开发规律[J]. 新疆石油地质, 2024, 45(2):228-234.
	SHI Lanxiang, TANG Wenjun, ZHOU You, et al. Study on water flooding with self-emulsification in heavy oil reservoirs[J]. Xinjiang Petroleum Geology, 2024, 45(2):228-234.
[3]	司睿, 石成方, 王英圣, 等. 基于驱替单元的水驱油藏动用状况分类评价方法[J]. 大庆石油地质与开发, 2023, 42(1):73-82.
	SI Rui, SHI Chengfang, WANG Yingsheng, et al. Classification and evaluation method of water flooded reservoir producing performance based on displacement units[J]. Petroleum Geology & Oilfield Development in Daqing, 2023, 42(1):73-82.
[4]	郭军辉, 郑宪宝, 王治国, 等. 大庆长垣油田水驱开发技术智能化实践与展望[J]. 大庆石油地质与开发, 2024, 43(3):203-213.
	GUO Junhui, ZHENG Xianbao, WANG Zhiguo, et al. Intelligent practice and prospects of water flooding development technology in Daqing Placanticline oilfield[J]. Petroleum Geology & Oilfield Development in Daqing, 2024, 43(3):203-213.
[5]	杜晓康, 李治平, 田丰, 等. 水驱油田高含水期体积波及系数预测方法[J]. 大庆石油地质与开发, 2018, 37(1):83-87.
	DU Xiaokang, LI Zhiping, TIAN Feng, et al. Predicting method of the volumetric swept coefficient for high-watercut waterflooded oilfields[J]. Petroleum Geology & Oilfield Development in Daqing, 2018, 37(1):83-87.
[6]	石立华, 师调调, 廖志昊, 等. 低渗致密砂岩油藏水驱储层变化规律[J]. 特种油气藏, 2024, 31(3):106-115. doi: 10.3969/j.issn.1006-6535.2024.03.014
	SHI Lihua, SHI Tiaotiao, LIAO Zhihao, et al. The variation law of water flooding reservoir in low permeability tight sandstone reservoirs[J]. Special Oil & Gas Reservoirs, 2024, 31(3):106-115.
[7]	高兴军, 宋新民, 李淑贞, 等. 高含水油田密闭取心检查井水淹状况及主控因素研究:以扶余油田泉四段油层为例[J]. 地学前缘, 2012, 19(2):162-170.
	GAO Xingjun, SONG Xinmin, LI Shuzhen, et al. Waterflooded situation and its key controlling factors in sealed coring of inspection wells at high water-cut stage:A case study of Quan-4 formation of Fuyu oilfield[J]. Earth Science Frontiers, 2012, 19(2):162-170.
[8]	兰丽凤, 平晓琳, 白振强, 等. 基于小井距检查井的夹层分布特征及对剩余油分布的控制作用:以萨尔图油田北二西区为例[J]. 油气地质与采收率, 2013, 20(4):83-87.
	LAN Lifeng, PING Xiaolin, BAI Zhenqiang, et al. Study on distribution characteristics of intra-formational bed based on dense inspection wells group:A case of Beierxi district of Sartu oilfield[J]. Petroleum Geology and Recovery Efficiency, 2013, 20(4):83-87.
[9]	兰玉波, 赵永胜, 魏国章. 矿场密闭取心与室内模拟的驱油效率分析[J]. 大庆石油学院学报, 2005, 29(4):43-45.
	LAN Yubo, ZHAO Yongsheng, WEI Guozhang. Analysis of displacement efficiency of field pressure coring and lab test[J]. Journal of Daqing Petroleum Institute, 2005, 29(4):43-45.
[10]	李忠江, 杜庆龙, 齐春艳, 等. 利用密闭取心井确定薄差油层水淹识别方法研究[J]. 石油天然气学报, 2005, 27(增刊5):747-748.
	LI Zhongjiang, DU Qinglong, QI Chunyan, et al. Research on identification method of water flooding in thin and differential reservoir using closed core well[J]. Journal of Oil and Gas Technology, 2005,27 (Supp.5):747-748.
[11]	张永强. 基于小井距检查井的特低渗透油藏水驱开发规律研究[D]. 北京: 中国石油大学(北京), 2017.
	ZHANG Yongqiang. Research on the water drive development law of ultra low permeability reservoirs based on small well spacing inspection wells[D]. Beijing: China University of Petroleum(Beijing), 2017.
[12]	FASSIHI M R. New correlations for calculation of vertical coverage and areal sweep efficiency[J]. SPE Reservoir Engineering, 1986, 1(6):604-606.
[13]	连建文, 汪耀宗, 杨继光. 水驱曲线标定技术可采储量的极限含水率[J]. 新疆石油地质, 2024, 45(6):687-695.
	LIAN Jianwen, WANG Yaozong, YANG Jiguang. Determination of limit water cut of technically recoverable reserves calibrated by water drive curve[J]. Xinjiang Petroleum Geology, 2024, 45(6):687-695.
[14]	吴宽宽, 冯其红, 张先敏, 等. 多层水驱油藏均衡驱替注采参数协同优化方法[J]. 油气地质与采收率, 2023, 30(5):67-75.
	WU Kuankuan, FENG Qihong, ZHANG Xianmin, et al. Collaborative optimization method of injection and production parameters for multi-layer reservoirs based on balanced water flooding[J]. Petroleum Geology and Recovery Efficiency, 2023, 30(5):67-75.
[15]	蔡文, 尹太举, 余洋, 等. 萨尔图油田北三西区检查井水淹层分析[J]. 石油地质与工程, 2012, 26(2):80-83.
	CAI Wen, YIN Taiju, YU Yang, et al. Analysis of the inspection well water flooded layer in Beisanxi area of Saertu oilfield[J]. Petroleum Geology and Engineering, 2012, 26(2):80-83.
[16]	陈洪才, 王昭凯, 金忠康, 等. 中低渗砂岩油藏水驱后期油藏再评价及提高采收率对策[J]. 特种油气藏, 2024, 31(4):133-141. doi: 10.3969/j.issn.1006-6535.2024.04.017
	CHEN Hongcai, WANG Zhaokai, JIN Zhongkang, et al. Re-evaluation of medium-low permeability sandstone reservoirs in the later stage of water flooding and strategies to improve recovery efficiency[J]. Special Oil & Gas Reservoirs, 2024, 31(4):133-141.
[17]	周超, 尹太举, 杨乐. 杏树岗油田检查井水洗规律研究:以X6-12-JE24井为例[J]. 长江大学学报(自然科学版), 2013, 10(8):73-76.
	ZHOU Chao, YIN Taiju, YANG Le. Study on water washing rule of inspection well in Xingshugang oilfield:Taking Well X6-12-JE24 as an example[J]. Journal of Yangtze University(Natural Science Edition), 2013, 10(8):73-76.
[18]	吕文雅, 安小平, 刘艳祥, 等. 致密砂岩储层注水诱导裂缝动态识别及演化特征:以鄂尔多斯盆地姬塬油田L井区长8油藏为例[J]. 石油与天然气地质, 2024, 45(5):1431-1446.
	LYU Wenya, AN Xiaoping, LIU Yanxiang, et al. Dynamic responses and evolutionary characteristics of waterflood-induced fractures in tight sandstone reservoirs:A case study of oil reservoirs in the 8th member of the Yanchang formation,Well Block L,Jiyuan oilfield,Ordos Basin[J]. Oil & Gas Geology, 2024, 45(5):1431-1446.

肉眼观察		滴水实验				沉降实验	塑料袋密闭实验	水洗级别
颜色	含水情况	滴水级别	渗入性	时间/min	水珠形状	颗粒沉降状态	塑料袋密闭实验	水洗级别
灰白色	明显含水，可见水外渗	1	速渗或缓渗	1~2	无水珠	团状	雾浓，袋壁有水珠	强
浅棕色	少量含水，手触有潮感	2	缓渗	10	凸镜状	絮凝状	有雾，水珠不明显，袋内明显有潮感	中
棕褐色	含水不明显	3	微渗	10	半珠状	絮状	雾稀薄	弱
深褐色	不含水，无潮感	4	不渗	10	近珠状	分散	无雾	无

井名	层位	砂体厚度/m	油层厚度/m	水洗厚度/m
井名	层位	砂体厚度/m	油层厚度/m	强	中	弱	合计
WJ16-151井	长61-21 小层	12.40	17.60	5.84	2.35	2.51	10.70
WJ16-151井	长61-31 小层	10.00	17.60
WJ16-152井	长61-21 小层	13.80	15.70			7.05	7.05
WJ16-152井	长61-31 小层	9.20	15.70
WJ16-153井	长61-21 小层	11.40	14.20		2.51	3.20	5.71
WJ16-153井	长61-31 小层	12.10	14.20
WJ16-154井	长61-21 小层	14.10	15.70	5.60	1.25		6.85
WJ16-154井	长61-31 小层	8.70	15.70			0.69	0.69
WJ16-155井	长61-21 小层	12.10	16.80	8.32		1.15	9.47
WJ16-155井	长61-31 小层	11.50	16.80			0.75	0.75
WJ16-156井	长61-21 小层	12.10	14.80		3.43	2.97	6.40
WJ16-156井	长61-31 小层	8.10	14.80			0.82	0.82
WJ16-157井	长61-21 小层	10.20	13.10		5.51	1.37	6.88
WJ16-157井	长61-31 小层	11.50	13.10
WJ16-158井	长61-21 小层	11.30	16.90		3.36	5.98	9.34
WJ16-158井	长61-31 小层	12.30	16.90			0.69	0.69
WJ16-159井	长61-21 小层	14.10	15.20		1.90	4.07	5.97
WJ16-159井	长61-31 小层	9.40	15.20			0.13	0.13

层位	类别	样品块数	石英含量/%	长石含量/%	岩浆岩岩屑含量/ %	变质岩岩屑含量/%				沉积岩岩屑含量/ %	黑云母含量/%	绿泥石含量/%
层位	类别	样品块数	石英含量/%	长石含量/%	岩浆岩岩屑含量/ %	石英岩	片岩	千枚岩	板岩	沉积岩岩屑含量/ %	黑云母含量/%	绿泥石含量/%
长61-21 小层	未水洗段	19	22.06	51.37	2.52	2.79	0.86	2.34	0.03	0.33	5.91	0.06
长61-21 小层	水洗段	90	26.08	47.68	2.59	1.56	0.83	1.51	0.91	0.01	4.89	0.35
长61-31 小层	未水洗段	30	20.64	48.86	3.04	4.24	1.41	1.65	0.11	0.30	5.80	0.12
长61-31 小层	水洗段	36	25.59	46.13	2.51	1.35	1.13	1.87	0.74	0.01	3.39	0.56

层位	样品块数	水洗程度	伊利石含量/ %	绿泥石含量/ %	方解石含量/ %	浊沸石含量/ %	硅质含量/ %	长石含量/ %	其他/%
长61-21 小层	6	强	0.3	3.1	1.3	0.7	0.6	0	0
	22	中	0.2	5.1	1.2	1.1	0.5	0.1	0.4
	23	弱	0.6	8.8	1.2	0.3	0.6	0.3	1.3
长61-31 小层	23	中	0.5	6.8	2.6	2.3	0.3	0	0.6
长61-31 小层	5	弱	0.2	10.6	1.5	1.3	0.5	0.3	1.4

层位	样品块数	水洗程度	面孔率/%	粒间孔/%	长石溶孔/%	浊沸石溶孔/%	其他孔隙/%
长61-21 小层	6	强	7.2	6.2	0.8	0.5	0.3
	22	中	5.8	4.9	0.6	0.6	0.3
	23	弱	5.4	4.2	0.9	0.4	0.2
长61-31 小层	23	中	3.4	2.5	0.4	0.3	0.3
长61-31 小层	5	弱	2.9	2.2	0.5	0.3	0.2