三维定量荧光技术在渤中坳陷油层识别中的应用研究

发布时间：2018-02-22 19:21

本文关键词： 三维定量荧光技术微弱荧光真假油气显示油质识别　出处：《东北石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：本次研究项目主要为了解决作业现场快速识别油气显示,进一步落实储层流体性质以及油质特征,同时剔除钻井液添加剂等因素对真实地层油气显示的影响。本项目通过三维定量荧光技术以渤中坳陷56口探井77个标准油样、292个壁心块样以及41种钻井液有机添加剂样品为分析对象并进行综合研究。建立了不同性质原油、钻井液体系高荧光有机添加剂的三维定量荧光图谱库,为真假油气显示判断提供判断依据。通过原油图谱特征和添加剂图谱特征根据主峰个数,出峰位置很好地判断真假油气显示。建立了两种原油性质判别方法:Ex与Em投点法和最佳波长比与原油密度投点法。Ex与Em投点法,主要以Em发射波长值为标准,同时最佳波长比做为判别的辅助参数,当Em小于340nm,最佳波长比介于1.127~1.140之间为凝析油;当Em为340~385nm,最佳波长比介于1.155~1.191之间为轻质油;当Em为385~405nm,最佳波长比介于1.120~1.153之间为中质油;Em大于405nm,最佳波长比介于1.088~1.123之间为重质油。建立了三维定量荧光录井技术储层流体性质两种解释评价方法:图版法和纵向参数变化趋势法。图版法通过油性指数与对比级别两参数建立图版划分储层流体性质,当油性指数大于1且对比级大于6为油层,当油性指数小于1且油性指数大于6为气层,当油气指数小于6为干层或水层。纵向参数变化趋势法利用油性指数、对比级以及气测值建立,当对比级大于6,油性指数大于1,气测值较基值5倍以上为油层,当对比级大于6,油性指数小于1,气测基值大于5倍以上为气层,当对比级同层顶部高于底部,且顶部大于6,油性指数大于1且底部变大,气测值纵向突然降低为油水同层,当对比级小于6,油性指数数据稳定,气测值小于基值的5倍为水层。该方法在渤中坳陷近两年现场作业中取得了良好的应用效果,对于识别真假油气显示,轻质油藏发现、微弱荧光显示,流体性质以及油质类型识别具有较强的技术优势。利用该方法对6口试油井原油性质判断符合率达100%,对9口井储层流体性质判断符合率达到89%以上,远远高于常规录井对储层的判断能力,进一步说明三维定量荧光技术在现场油气显示解释评价有很好的作用,逐步向整个渤海海域应用推广。
[Abstract]:The main purpose of this research project is to solve the problem of quick identification of oil and gas display on the job site, and to further implement the reservoir fluid properties and oil quality characteristics. At the same time, the effects of drilling fluid additives and other factors on the oil and gas display in real formation were eliminated. Based on the 3D quantitative fluorescence technique, 292 wall core samples and 41 kinds of drilling fluids were added to 57 standard oil samples of 56 exploration wells in Bozhong Depression. The additive sample was used as the analytical object and the comprehensive study was carried out. The crude oil with different properties was established. The 3D quantitative fluorescence map library of high fluorescence organic additives in drilling fluid system provides a basis for judging true and false oil and gas display. Through the characteristics of crude oil map and additive spectrum, the number of main peaks is calculated. In this paper, we have established two methods to judge the true and false oil and gas display. Two methods of judging crude oil properties, one is to judge the properties of crude oil, and the other is to determine the point of point of the best wavelength ratio and the density of crude oil. The two methods are mainly based on the emission wavelength of Em. At the same time, the optimum wavelength ratio is between 1.127nm and 1.140.When the Em is less than 340nm, the optimum wavelength ratio is between 1.155nm and 1.155nm, and the optimum wavelength ratio is between 1.155nm and 1.191.The optimum wavelength ratio is 1.127nm, and the optimum wavelength ratio is 1.155nm, and the optimum wavelength ratio is between 1.155nm and 1.191. When E _ m is 385nm, the optimum wavelength ratio is between 1.120 and 1.153, the medium oil E _ m is greater than 405nm, and the best wavelength ratio is between 1.088 and 1.123. Two interpretation and evaluation methods for reservoir fluid properties of 3D quantitative fluorescence logging technology are established: chart method and longitudinal method. The method of chart plate is used to divide the fluid properties of reservoir through two parameters: oil index and contrast level. When the oil index is greater than 1 and the correlation level is greater than 6, when the oil index is less than 1 and the oil index is greater than 6, and when the oil and gas index is less than 6, it is a dry layer or a water layer. When the correlation stage is greater than 6, the oil index is greater than 1, the gas value is more than 5 times of the base value, when the contrast stage is greater than 6, the oil index is less than 1, and the base value of gas measurement is more than 5 times. When the top of the same layer is higher than the bottom, and the top is greater than 6, the oil index is greater than 1 and the bottom becomes larger, and the gas measurement value suddenly decreases to the same layer of oil and water. When the contrast level is less than 6, the data of oil index is stable. The gas logging value is less than 5 times of the base value. The method has been applied to the field operation in the last two years in the Bozhong Depression. For identifying true and false oil and gas, the light oil reservoir is found to have weak fluorescence display. The identification of fluid properties and oil quality types has a strong technical advantage. By using this method, the coincidence rate of judging crude oil properties in 6 wells is 100 and that in 9 wells is more than 89%. It is far higher than conventional logging in judging reservoir, which further shows that 3D quantitative fluorescence technique has a good effect on oil and gas interpretation and evaluation in the field, and is gradually applied to the whole Bohai Sea area.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE142

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