| 鄂尔多斯盆地华庆地区延长组长8高阻水层成因分析与识别 |
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| 引用本文： | 张志升,王小军,冯立勇,李永锋,付国民,王康.鄂尔多斯盆地华庆地区延长组长8高阻水层成因分析与识别[J].西北地质,2020(2):244-252. |
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| 作者姓名： | 张志升 王小军 冯立勇 李永锋 付国民 王康 |
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| 作者单位： | 延长油田股份有限公司;中国石油长庆油田分公司第一采油厂;长安大学地球科学与资源学院 |
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| 基金项目： | 国家示范工程项目“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”(2011ZX05044);中国博士后基金“鄂尔多斯盆地南部特低渗储层精细评价及地质模型研究”项目(20070420489)。 |
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| 摘 要： | 华庆油田长8油藏中普遍发育高阻水层,同一储层砂体中水层与油层电性差异甚微,水层计算的含油饱和度明显偏高,导致传统测井解释与压裂试油吻合率较低。综合应用测录井、试油试采、分析化验等资料,分析高阻水层形成原因及控制因素,运用电阻率形态差异法建立流体识别标准。研究表明,华庆油田长8油藏储层亲油,绿泥石膜发育,普遍含沥青质充填孔隙,在自吸和颗粒表面的吸附作用下,形成绿泥石膜-有机质复合体,致使储层测井响应为高阻,而非润湿的水相占据相对畅通的较大孔喉,容易流动,在油气富集程度较低时,试油大量出水;采用电阻率曲线形态法分"凸型"、"凹型"分别建立测井识别图版及流体识别标准,凸型油层:△t≥216μs/m,Rt≥36Ωm;凹形油层:△t≥221μs/m,Rt≥60Ωm。相对常规图版交汇法,总体使测井解释与试油试采吻合率提高15%以上,对识别高阻水层应用效果显著。
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| 关 键 词： | 高阻水层 测井解释 长8油藏 华庆油田 鄂尔多斯盆地 |
Genetic Analysis and Identification of Yanchang 8 High-resistivity Water Layer in Huaqing Area,Ordos Basin |
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| ZHANG Zhisheng,WANG Xiaojun,FENG Liyong,LI Yongfeng,FU Guomin,WANG Kang.Genetic Analysis and Identification of Yanchang 8 High-resistivity Water Layer in Huaqing Area,Ordos Basin[J].Northwestern Geology,2020(2):244-252. |
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| Authors: | ZHANG Zhisheng WANG Xiaojun FENG Liyong LI Yongfeng FU Guomin WANG Kang |
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| Institution: | (Yanchang oilfield co.LTD,Yan’an 716000,Shananxi,China;First oil production plant,Changqing Oil Field Company,Yan’an 716000,Shananxi,China;School of Earth Science and Resources,Chang’an University,Xi’an 710054,Shaanxi,China) |
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| Abstract: | The high-resistance water layer is generally developed in Chang 8 reservoir,Huaqing area of Ordos Basin.There is little electrical difference between the water layer and the oil layer in the same reservoir sand body.The oil saturation calculated in water layer is obviously higher,and the traditional well-logging interpretation has a low agreement with fracturing test.Combined with logging interpretation,formation testing,production testing and laboratory data analysis,the formation and control factors of high resistivity layer were analyzed,and the fluid identification standard was established by using the resistivity morphological difference method.The results show that the Chang 8 reservoir of Huaqing area is oleophylic,chlorite membrane developed and asphaltene is generally filled with pores.Chlorite membrane-organic matter complex is formed under the action of self-priming and particle surface adsorption and results in high resistivity logging response,while the non-wetted water phase occupied the relatively unobstructed larger pore throat and easy to flow.In the low enrichment of oil and gas,water produced.By means of resistivity-curve-shape method,the chart“convex”and“concave”logging identification chart and fluid identification standard are established respectively.Convex reservoir is△t≥216μs/m,Rt≥36Ω.m and the concave reservoir is△t≥221μs/m,Rt≥60Ω.m.As a whole,the coincidence rate between logging interpretation and oil test production increases more than 15%,compared with the conventional plate intersection method.It has a remarkable effect on the identification of high resistivity water layer. |
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| Keywords: | high resistance water layer logging interpretation chang 8 reservoir huaqing oilfield Ordos Basin |
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