Identification of Low-Resistivity Oil Layers Based on Clay Mineral Analysis

doi:10.7657/XJPG20200217

Abstract

Abstract:

There are distinct differences between the resistivity of Chang 8₁ reservoir of the western and eastern blocks in Zhenbei Oilfield, Ordos basin. The reservoir resistivity in the western block is significantly lower than that of the eastern block of Zhenbei oilfield and there are low resistivity oil layers in local areas. As a result, it is hard to identify oil and water layers in the western block, which brings difficulties for oilfield development. Based on the data of cast thin section, X-ray diffraction, SEM, mercury injection and logging interpretation, the characteristics of clay minerals and their effects on the resistivity of Chang 8₁ oil reservoir in Zhenbei oilfield are studied in this paper. The results show that the controls of clay minerals on low-resistivity oil layer in western Zhenbei oilfield are mainly manifested in three aspects. The first is the additional conductivity of clay minerals—the contents of illite and chlorite with relatively strong cation exchange capacity are high in the reservoir of the western block, leading to stronger additional conductivity. The second is the adsorption of water molecules to clay minerals—the content of chlorite with strong adsorption capacity is high, so it is easy to form water film and increase electric conductivity. Thirdly, the relatively high contents of clay minerals make the pore structures of the reservoir more complicated, which increases irreducible water saturation. For this kind of low-resistivity oil layers with high clay mineral content, a model is established to calculate the clay mineral content in reservoir through analyzing the response characteristics of logging curves. Combining with production status, the water productivity of low-resistivity oil layer is eventually matched and finally the identification accuracy of low-resistivity oil layer is improved.

Key words: Ordos basin, Zhenbei oilfield, Yanchang formatioan, low resistivity oil layer, clay mineral, water productivity

CLC Number:

TE112.221

FENG Yuan, QIN Kang, LI Erdang, ZHANG Renyan. Identification of Low-Resistivity Oil Layers Based on Clay Mineral Analysis[J]. Xinjiang Petroleum Geology, 2020, 41(2): 237-242.

Figures/Tables 11

Table 1

Fig. 1.

Table 2

Fig. 2.

Table 3

Fig. 3.

Fig. 4.

Fig. 5.

Table 4

Fig. 6.

Fig. 7.

References 22

[1]	于红岩, 李洪奇, 郭兵 , 等. 基于成因机理的低阻油层精细评价方法[J]. 吉林大学学报(地球科学版), 2012,42(2):335-343.
	YU Hongyan, LI Hongqi, GUO Bing , et al. Low-resistivity oil layers fine evaluation approaches based on mechanism[J]. Journal of Jilin University(Earth Science Edition), 2012,42(2):335-343.
[2]	周康, 刘佳庆, 段国英 , 等. 吴起地区长6₁ 油层黏土矿物对油层低电阻率化的影响[J]. 岩性油气藏, 2012,24(2):26-30.
	ZHOU Kang, LIU Jiaqing, DUAN Guoying , et al. Effect of clay minerals on low resistivity of Chang 6₁ reservoir in Wuqi area[J]. Lithologic Reservoirs, 2012,24(2):26-30.
[3]	杨春梅, 周灿灿, 程相志 , 等. 低电阻率油层成因机理分析及有利区预测[J]. 石油勘探与开发, 2008,35(5):600-605.
	YANG Chunmei, ZHOU Cancan, CHENG Xiangzhi , et al. Origin of low resistivity pays and forecasting of favorable prospecting areas[J]. Petroleum Exploration and Development, 2008,35(5):600-605.
[4]	中国石油勘探与生产公司. 低阻油气藏测井识别评价方法与技术[M]. 北京: 石油工业出版社, 2006.
	PetroChina Exploration & Production Company. Logging recognition evaluation method and technology for Low resistivity reservoirs[M]. Beijing: Petroleum Industry Press, 2006.
[5]	赵政璋, 欧阳健, 刘德来 , 等. 渤海湾地区低电阻油气层测井技术与解释方法[M]. 北京: 石油工业出版社, 2000.
	ZHAO Zhengzhang, OUYANG Jian, LIU Delai , et al. Logging technology and interpretation method for low resistance reservoirs in Bohai Bay area[M]. Beijing: Petroleum Industry Press, 2000.
[6]	HAMADA G M . Petrophysical evaluation of low-resistivity sandstone reservoirs with nuclear magnetic resonance log[J]. Journal of Petroleum Science and Engineering, 2001,29:129-138.
[7]	王赛英, 赵冠军, 张萍 , 等. 低阻油层形成机理及测井识别方法研究[J]. 特种油气藏, 2010,17(4):10-14.
	WANG Saiying, ZHAO Guanjun, ZHANG Ping , et al. Formation mechanism and logging identification of low resistivity reservoir[J]. Special Oil and Gas Reservoirs, 2010,17(4):10-14.
[8]	惠威, 刘一仓, 王联国 , 等. 镇北油田长8 段储集层孔隙类型与水驱油渗流特征[J]. 新疆石油地质, 2018,39(5):585-590.
	HUI Wei, LIU Yicang, WANG Lianguo , et al. Reservoir pore types and flowing characteristics of oil displacement by water in the Chang-8 member of Zhenbei oilfield,Ordos basin[J]. Xinjiang Petroleum Geology, 2018,39(5):585-590.
[9]	冯渊, 杨伟伟, 刘一仓 , 等. 鄂尔多斯盆地镇北油田长8₁油藏电阻率差异成因[J]. 新疆石油地质, 2015,36(5):526-530.
	FENG Yuan, YANG Weiwei, LIU Yicang , et al. Analysis on causes of reservoir resistivity differences of Chang 8₁ reservoir in Zhenbei oilfield,Ordos basin[J]. Xinjiang Petroleum Geology, 2015,36(5):526-530.
[10]	解宏伟, 田世澄, 胡平 , 等. 准噶尔盆地低阻油气层成因及识别[J]. 新疆石油地质, 2008,29(2):219-221.
	XIE Hongwei, TIAN Shicheng, HU Ping , et al. Identification and origin of low-resistivity oil-gas layers in Junggar basin[J]. Xinjiang Petroleum Geology, 2008,29(2):219-221.
[11]	陈清华, 王正 . 苏北盆地低电阻率油气层成因与识别[J]. 特种油气藏, 2008,15(2):11-13.
	CHEN Qinghua, WANG Zheng . Origin and identification of low resistivity reservoirs in North Jiangsu basin[J]. Special Oil and Gas Reservoirs, 2008,15(2):11-13.
[12]	廖明光, 苏崇华, 唐洪 , 等. W油藏粘土矿物特征及油层低阻成因[J]. 西南石油大学学报(自然科学版), 2010,32(5):70-74.
	LIAO Mingguang, SU Chonghua, TANG Hong , et al. Characteristics of clay minerals in W low resistivity reservoirs and the genesis of low resistivity[J]. Journal of Southwest Petroleum University(Science ＆ Technology Edition), 2010,32(5):70-74.
[13]	丁锐 . 地层粘土水化的总体机理和影响因素[J]. 油田化学, 1998,15(2):180-184.
	DING Rui . The general mechanisms and influencing factors in formation clay hydration[J]. Oilfield Chemistry, 1998,15(2):180-184.
[14]	高霞, 谢庆宾 . 低电阻率油气藏成因机理及研究方法综述[J]. 中外能源, 2006,11(6):28-32.
	GAO Xia, XIE Qingbin . A survey on mechanism and research advance of low-resistivity reservoir[J]. China Foreign Energy, 2006,11(6):28-32.
[15]	赵杏媛 . 粘土矿物与油气[J]. 新疆石油地质, 2009,30(4):533-535.
	ZHAO Xingyuan . The impact of clay minerals on oil-gas reservoir[J]. Xinjiang Petroleum Geology, 2009,30(4):533-535.
[16]	廖明光, 唐洪, 苏崇华 , 等. W低阻油藏高不动水饱和度的成因及对低阻油层的影响[J]. 石油实验地质, 2010,32(4):353-361.
	LIAO Mingguang, TANG Hong, SU Chonghua , et al. Genesis of high immobile water saturation in the W low resistivity reservoirs and its influence on the low resistivity reservoir[J]. Petroleum Geology & Experiment, 2010,32(4):353-361.
[17]	邱隆伟, 葛君, 师政 , 等. 惠民凹陷商河地区沙三上亚段低阻油层特征及控制因素[J]. 新疆石油地质, 2017,38(1):15-21.
	QIU Longwei, GE Jun, SHI Zheng , et al. Characteristics and controlling factors of low-resistivity reservoir of upper submember of Es₃ in Shanghe area of Huimin sag[J]. Xinjiang Petroleum Geology, 2017,38(1):15-21.
[18]	穆龙新, 田中元, 赵丽敏 . A油田低电阻率油层的机理研究[J]. 石油学报, 2004,25(2):69-73.
	MU Longxin, TIAN Zhongyuan, ZHAO Limin . Investigation on mechanism of low-resistivity formation of A oilfield[J]. Acta Petrolei Sinica, 2004,25(2):69-73.
[19]	李俊, 张占松 . S区块低电阻率油层成因分析与评价[J]. 岩性油气藏, 2011,23(2):106-108.
	LI Jun, ZHANG Zhansong . Genetic analysis and evaluation of low resistivity reservoir in block S[J]. Lithologic Reservoirs, 2011,23(2):106-108.
[20]	杨巍, 陈国俊, 张铭杰 , 等. 鄂尔多斯盆地镇北地区长8 油层组自生绿泥石对储集层物性的影响[J]. 岩性油气藏, 2012,24(3):27-32.
	YANG Wei, CHEN Guojun, ZHANG Mingjie , et al. Influence of authigenic chlorite on reservoir properties of Chang 8 oil reservoir set in Zhenbei area,Ordos basin[J]. Lithologic Reservoirs, 2012,24(3):27-32.
[21]	邢培俊, 孙建孟, 王克文 , 等. 利用测井资料确定粘土矿物的方法对比[J]. 中国石油大学学报(自然科学版), 2008,32(2):53-57.
	XING Peijun, SUN Jianmeng, WANG Kewen , et al. Comparison of determination methods for clay minerals using log data[J]. Journal of China University of Petroleum, 2008,32(2):53-57.
[22]	史成恩, 万晓龙, 赵继勇 , 等. 鄂尔多斯盆地超低渗透油层开发特征[J]. 成都理工大学学报(自然科学版), 2007,34(5):538-542.
	SHI Cheng’en, WAN Xiaolong, ZHAO Jiyong , et al. Development characteristics of super-low permeability oil layers in Ordos basin,China[J]. Journal of Chengdu University of Technology(Science & Technology Edition), 2007,34(5):538-542.