歧口凹陷歧北斜坡带沙二段致密砂岩储层流体识别与评价  

Fluid Identification and Evaluation of Tight Sandstone Reservoir in Es_(2) of Qibei Slope Belt in Qikou Sag

作　　者：刘一茗[1,2] 叶加仁[1,2] 张飞 林学春[3] 祁爱平[3] 李玮龙[4] 赵军 Liu Yiming;Ye Jiaren;Zhang Fei;Lin Xuechun;Qi Aiping;Li Weilong;Zhao Jun(Key Laboratory of Tectonics and Petroleum Resources,Ministry of Education,China University of Geosciences,Wuhan 430074,China;School of Earth Resources,China University of Geosciences,Wuhan 430074,China;Exploration and Development Research Institute of PetroChina Dagang Oilfield,Tianjin 300280,China;The Fifth Oil Production Plant of PetroChina Dagang Oilfield,Tianjin 300280,China)

机构地区：[1]中国地质大学构造与油气资源教育部重点实验室,湖北武汉430074 [2]中国地质大学资源学院,湖北武汉430074 [3]中国石油大港油田公司勘探开发研究院,天津300280 [4]中国石油大港油田公司第五采油厂,天津300280

出　　处：《地球科学》2022年第5期1762-1776,共15页Earth Science

基　　金：大港油田横向协作项目(No.DGYT-2020-JS-37);构造与油气资源教育部重点实验室开放课题项目(No.TPR-2020-11);中央高校基本科研业务费专项资金资助项目(No.G1323521043).

摘　　要：为了解决歧口凹陷歧北斜坡带古近系沙二段致密砂岩储层流体识别效果差、精度低等问题,在储层“四性”关系分析,测井系列优选,测井曲线标准化,岩电和核磁共振实验的基础上,建立储层参数及流体饱和度测井解释模型,采用定性‒半定量‒定量的方法对储层流体进行识别与评价.沙二段致密砂岩储层“四性”关系复杂,测井解释模型相关系数高,在0.75~0.95;重叠图法可以定性区分高阻油层与水层,I_(wa)-Φ及I_(a)-I_(wa)交会图版可以有效区分油层、油水层及水层,公式法可以定量划分油层、油水层、水层,计算出三者的含水饱和度区间分别为35.5%~91.4%、60.5%~96.5%、77.2%~90.9%,束缚水饱和度区间分别为30.3%~89.9%、58.2%~90.1%、62.1%~64.4%.本次流体识别及评价精度比原方法提高了25%,为研究区油气勘探开发提供了可靠的技术支持.In order to solve the poor effect and low accuracy of fluid identification of Es_(2) tight sandstone reservoir in Qibei slope belt,logging interpretation model of reservoir and fluid saturation is established,based on the analysis of reservoir characteristics and“four natures”relationship,optimization of logging series,standardization of logging curve,combined with petro-electric and NMR experimental results,with an integrated approach of qualitative,semi-qualitative and quantitative methods to identify and evaluate the fluid in tight sandstone reservoir.The relationship between“four natures”of tight sandstone reservoir in Es;is complex,and the correlation coefficient of logging interpretation model is high,ranging between 0.75 and 0.95.Overlappingmap method can qualitatively distinguish high resistivity oil layer and water layer.Cross-plot method(I_(wa)-Φand I_(a)-I_(wa))can effectively distinguish oil layer,oil-water layer and water layer.The water saturation interval of oil layer,oil-water layer,water layer calculated by the legal quantity of the formula is 35.5%-91.4%,60.5%-96.5%,and 77.2%-90.9%,respectively,and the irreducible water saturation interval of oil layer,oil-water layer,water layer calculated by the legal quantity of the formula is 30.3%-89.9%,58.2%-90.1%,and 62.1%-64.4%,respectively.The coincidence rate of logging fluid identification and evaluation results is 25%higher than the original logging interpretation,and it provides reliable technical support for oil and gas exploration and development in the study area.

关 键 词：歧北斜坡带 致密砂岩 岩电实验 核磁共振 测井评价 油气地质. 

分 类 号：P618[天文地球—矿床学]