鄂尔多斯盆地合水地区长2油层低阻成因及识别

doi:10.7657/XJPG20200301

摘要/Abstract

摘要：

为明确鄂尔多斯盆地合水地区延长组长2油层低阻成因,利用扫描电镜、铸体薄片、压汞实验、图像粒度、图像孔隙和水质等分析资料进行研究。结果表明,合水地区油层低阻成因主要为地层水矿化度高、孔隙结构复杂及束缚水含量较高。由于大气降水带入了上覆地层风化剥蚀形成的离子,导致地层水矿化度增高;大气降水携带CO₂进入储集层,与长石发生反应,生成高岭石,高岭石矿物的不饱和电性吸附阳离子,使阳离子交换量变大,导致其附加导电性增强;蒙皂石析出层间水从介质中吸取K ⁺,Al ³⁺等金属离子,致使晶体结构重排,发生类质同象替代,导致储集层电阻率降低。针对研究区油层特征,提出了利用电阻率与厚度交会图识别低阻油层,确定各因素在低阻油层中的上、下限值,建立了长2低阻油层识别图版,其识别结果与试油结果符合率在80%以上。

关键词: 鄂尔多斯盆地, 合水地区, 延长组, 低阻油层, 测井响应特征, 孔隙结构, 矿化度

Abstract:

In order to determine the genesis of low resistivity of Chang 2 oil layer in Heshui area of Ordos basin, the paper analyzes the data of scanning electron microscope, casting thin section, mercury injection experiment, grain size, porosity and water quality. The results show that the low resistivity of the oil layer is attributed to high salinity of formation water, complex pore structure and high content of irreducible water. The high salinity of formation water is mainly caused by atmospheric precipitation which brings the ions from weathering and denudation of the overlying strata into the formation; CO₂ carried by atmospheric precipitation reacts with feldspar in the formation and then kaolinite forms. The kaolinite with unsaturated electrical properties can adsorb cation and the cation exchange quantity increases, causing the enhancement of kaolinite additional conductivity. The metal ions such as K ⁺ and Al ³⁺ in medium are absorbed by smectite, which results in the rearrangement of the crystal and the substitution of isomorphism, leading to the low resistivity of the reservoir. In view of the characteristics of the oil layer in the study area, the paper proposes that a crossplot of resistivity and thickness can be used to identify low-resistivity oil layers, and to determine the upper and lower limits of each factor in the low-resistance oil layer, and establishes a chart to identify low-resistance oil layers for Chang 2 member with the coincidence rate between the identification result and the oil test result being more than 80%.

Key words: Ordos basin, Heshui area, Yanchang formation, low resistivity oil layer, logging response characteristic, pore structure, salinity

中图分类号:

TE122.111

潘祎文, 左晓欢, 张世涛, 张耀华. 鄂尔多斯盆地合水地区长2油层低阻成因及识别[J]. 新疆石油地质, 2020, 41(3): 253-260.

PAN Yiwen, ZUO Xiaohuan, ZHANG Shitao, ZHANG Yaohua. Genesis and Identification of Low Resistivity of Chang 2 Oil Layer in Heshui Area, Ordos Basin[J]. Xinjiang Petroleum Geology, 2020, 41(3): 253-260.

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参考文献 26

[1]	翟利华, 林艳波, 秦智 , 等. 鄂尔多斯盆地姬塬地区延长组长4+5低阻油层成因及识别方法[J]. 油气地质与采收率, 2018,25(2):50-57.
	ZHAI Lihua, LIN Yanbo, QIN Zhi , et al. Genesis mechanism and identification methods of low resistivity oil reservoirs in Chang4+5 member of Yanchang formation in Jiyuan area,Ordos basin[J]. Petroleum Geology and Recovery Efficeiency, 2018,25(2):50-57.
[2]	赵虹, 党犇, 姚泾利 , 等. 鄂尔多斯盆地姬塬地区延长组长2低阻油层成因机理[J]. 石油实验地质, 2009,31(6):588-592.
	ZHAO Hong, DANG Ben, YAO Jingli , et al. Forming mechanism of Chang 2 low resistivity oil layer,Yanchang formation,Jiyuan region,Ordos basin[J]. Petroleum Geology & Experiment, 2009,31(6):588-592.
[3]	刘学珍, 杨迎春, 周翔 , 等. 鄂尔多斯盆地代家坪地区延长组原油成因及成藏其次[J]. 新疆石油地质, 2019,40(4):414-421.
	LIU Xuezhen, YANG Yingchun, ZHOU Xiang , et al. Genesis and accumulation periods of oil in Yanchang formation of Daijiaping area,Ordos basin[J]. Xinjiang Petroleum Geology, 2019,40(4):414-421.
[4]	王建民, 王佳媛 . 鄂尔多斯盆地伊陕斜坡上的低幅度构造与油气富集[J]. 石油勘探与开发, 2013,40(1):49-57.
	WANG Jianmin, WANG Jiayuan . Low-amplitude structure and oil-gas enrichment on the Yishaan slope,Ordos basin[J]. Petroleum Exploration and Development, 2013,40(1):49-57.
[5]	陈清华, 孙述鹏, 李琴 . 孤东油田东营组低阻油层成因分析[J]. 石油大学学报(自然科学版), 2004,28(3):9-12.
	CHEN Qinghua, SUN Shupeng, LI Qin . Genetic analysis of low-resistivity reservoirs in Dongying formation of Gudong oilfield[J]. Journal of China University of Petroleum (Edition of Natural Science), 2004,28(3):9-12.
[6]	开炜 . 蒙皂石族矿物与有机质的相互作用实验研究[D]. 南京:南京大学, 2018.
	KAI Wei . Experimental study on the interaction between smectite minerals and organic matter[D]. Nanjing:Nanjing University, 2018.
[7]	张俊程, 李本仙, 孟杰 , 等. 蒙脱石伊利石化的水热实验模拟[J]. 世界地质, 2018,37(1):316-326.
	ZHANG Juncheng, LI Benxian, MENG Jie , et al. Transformation of montmorillonite illitization based on hydrothermal experimental[J]. Global Geology, 2018,37(1):316-326.
[8]	雷新荣, 刘惠芳, 陆琦 . 沉积地层中伊/蒙混层黏土矿物的晶体结构晶体化学研究[J]. 沉积学报, 1997,15(1):98-103.
	LEI Xinrong, LIU Huifang, LU Qi . Crystal structure and crystallochemistry study on illite/smectite interstratified clay minerals in sedimentary strata[J]. Acta Sedimentae Sinica, 1997,15(1):98-103.
[9]	张立飞 .蒙皂石伊利石化的三种成因机制[J].地学前缘, 1994, 1(增刊1):157.Z HANG Lifei.
	Three genetic mechanisms of the petrification of mengzonite yili[J]. Earth Science Frontiers, 1994,1(Supp.1):157.
[10]	赵军龙, 李甘, 朱广社 , 等. 低阻油层成因机理及测井评价方法综述[J]. 地球物理学进展, 2011,26(4):1 334-1 342.
	ZHAO Junlong, LI Gan, ZHU Guangshe , et al. Review of logging evaluating method and contributing factors or mechanism on low resistivity reservoir[J]. Progress in Geophysics, 2011,26(4):1 334-1 342.
[11]	李国欣, 欧阳健, 周灿灿 , 等. 中国石油低阻油层岩石物理研究与测井识别评价技术进展[J]. 中国石油勘探, 2006,11(2):43-50.
	LI Guoxin, OUYANG Jian, ZHOU Cancan , et al. Advancement of petrophysics research and well-logging recognition and evaluation for low-resistivity oil-layer by PetroChina[J]. China Petroleum Exploration, 2006,11(2):43-50.
[12]	GREENE K R . Charge densities and heats of immersion of some clay minerals[J]. Clay Minerals, 1962,27(5):1-8.
[13]	梁春秀 . 松辽盆地南部低阻油层形成机理与定量评价[D]. 成都:成都理工大学, 2003.
	LIANG Chunxiu . The formation mechanism and quantitative evaluating of the low resistivity oil bed of the southern of Songliao basin[D]. Chengdu:Chengdu University of Technology, 2003.
[14]	王斌, 孙卫, 白云云 , 等. 鄂尔多斯盆地姬塬地区长6₁段致密砂岩储集层成岩作用与孔隙演化[J]. 新疆石油地质, 2018,39(4):430-438
	. WANG Bin, SUN Wei, BAI Yunyun , et al. Diagenesis and pore evolution of tight sandstone reservoir of Chang 6₁ member in Jiyuan area,Ordos basin[J]. Xinjiang Petroleum Geology, 2018,39(4):430-438.
[15]	王维斌, 郭杜凯, 陈旭峰 , 等. 鄂尔多斯盆地吴起地区延长组长6₁低阻油层成因分析及识别方法[J]. 油气地质与采收率, 2017,24(2):38-45.
	WANG Weibin, GUO Dukai, CHEN Xufeng , et al. Genetic analysis and identification methods of Chang6₁ low resistivity oil pays in Yanchang formation in Wuqi area,Ordos basin[J]. Petroleum Geology and Recovery Efficiency, 2017,24(2):38-45.
[16]	谢青, 王建民 . 鄂尔多斯盆地志丹、安塞地区长6低阻油层成因机理及识别方法[J]. 岩性油气藏, 2013,25(3):106-111.
	XIE Qing, WANG Jianmin . Genetic mechanism and identification method of Chang 6 low resistivity reservoir in Zhidan and Ansai areas,Ordos basin[J]. Lithologic Reservoirs, 2013,25(3):106-111.
[17]	郭顺, 王震亮, 张小莉 , 等. 陕北志丹油田樊川区长6 ¹低阻油层成因分析与识别方法 [J]. 吉林大学学报(地球科学版), 2012,42(1):18-24.
	GUO Shun, WANG Zhenliang, ZHANG Xiaoli , et al. Origin analysis on Chang 6 ¹ reservoir with low resistity and its identificating methods from Fanchuan area,Zhidan oil field,in Northern Shaanxi,Ordos basin [J]. Journal of Jilin University (Earth Science Edition), 2012,42(1):18-24.
[18]	朱静 . 鄂尔多斯盆地三叠系延长组下部沉积体系与储层特征研究[D]. 西安:西北大学, 2013.
	ZHU Jing . Study on sedimentary system and reservoir characteristics in the lower part of Yanchang formation in Triassic system in Ordos basin[D]. Xi’an:Northwest University, 2013.
[19]	李克勤 . 陕甘宁盆地晚三叠世的三角洲[J]. 沉积学报, 1986,4(1):86-95.
	LI Keqin . Later Triassic deltas in Shaanxi-Gansu-Ningxia basin[J]. Acta Sedimentae Sinica, 1986,4(1):86-95.
[20]	孟元林, 魏巍, 王维安 , 等. 超压背景下黏土矿物转化的优化模型[J]. 吉林大学学报(地球科学版), 2012,42(增刊1):145-153.
	MENG Yuanlin, WEI Wei, WANG Weian , et al. AN optimization model of clay mineral transformation under overpressure setting[J]. Journal of Jilin University (Earth Science Edition), 2012,42(Supp.1):145-153.
[21]	臧士宾, 郑永仙, 崔俊 , 等. 砂砾岩储集层微观非均质性定量评价:以柴达木盆地昆北油田为例[J]. 岩性油气藏, 2018,30(3):35-42.
	ZENG Shibin, ZHENG Yongxian, CUI Jun , et al. Quantitative evaluation on micro-heterogeneity of glutenite reservoir:a case from Kunbei oilfield in Qaidam basin[J]. Lithologic Reservoir, 2018,30(3):35-42.
[22]	罗洪飞, 丁圣, 周备 . 金湖凹陷闵桥油田低阻油层成因与识别[J]. 复杂油气藏, 2016,9(3):40-44.
	LUO Hongfei, DING Sheng, ZHOU Bei . Genesis and identification of low resistivity reservoir in Minqiao oilfield of Jinhu sag[J]. Complex Hydrocarbon Reservoirs, 2016,9(3):40-44.
[23]	赵军, 邓婷, 刘兴礼 , 等. 吉拉克油田三叠系低阻油层识别方法[J]. 特种油气藏, 2011,18(1):25-27.
	ZHAO Jun, DENG Ting, LIU Xingli , et al. Identification of the Triassic low resistivity reservoir in Jilake oilfield[J]. Special Oil and Gas Reservoir, 2011,18(1) : 25-27.
[24]	黄琴, 张建民, 蔡辉 , 等. 基于主控因素识别低阻油层的评价方法[J]. 西安石油大学学报(自然科学版), 2017,32(2):35-39.
	HUANG Qin, ZHANG Jianmin, CAI Hui , et al. Evaluation method for identification low resistance reservoir based on main control factors[J]. Journal of Xi’an Shiyou University(Natural Science Edition), 2017,32(2):35-39.
[25]	程相志 . 低阻油气层识别评价技术及分布规律研究[D].山东青岛:中国石油大学( 华东), 2008.
	CHENG Xiangzhi . Study of recognition technology and distribution law on low-resistivity oil reservoir[D]. Qingdao,Shandong:China University of Petroleum( East China), 2008.
[26]	汪跃, 刘洪洲, 李宏远 , 等. 基于地质因素控制的低阻油层成因分析及识别方法[J]. 复杂油气藏, 2019,12(1):44-48.
	WANG Yue, LIU Hongzhou, LI Hongyuan , et al. Genetic analysis and identification method of low-resistivity reservoir based on geological factors[J]. Complex Hydrocarbon Reservoir, 2019,12(1):44-48.