泥页岩储盖层测井评价

发布时间：2018-09-09 16:34

【摘要】：近年来页岩油气研究越来越受到关注,泥页岩生储盖一体,导致岩性、物性等特征复杂。本文以苏北盆地阜二段泥页岩储层以及西湖凹陷中央反转构造带花港组和平湖组泥页岩盖层作为研究对象,在基础地质研究的基础上,针对苏北盆地泥页岩储层、西湖凹陷泥岩盖层两个研究目的层段,利用测井资料开展储、盖层性质的测井评价。针对泥页岩储层,首先在对测井资料标准化以及岩心深度归位的基础上,依据“矿物—电性”关系建立岩石中的粘土矿物、长英质矿物和碳酸盐矿物与相应敏感测井曲线间关系,并利用△logR方法对泥岩段有机碳含量进行计算,从而对泥页岩储层岩相进行识别划分;同时对物性参数、岩石力学参数等泥页岩储层主要评价参数进行测井模型的建立,从而实现各单井的测井解释;最后在单井解释的基础上,根据其矿物组成、TOC含量、裂缝发育程度、物性特征、泥岩厚度等参数的平面展布特征,在地质研究的基础上采用多因素叠加、地质类比等方法进行测井评价。研究认为有利岩相厚度越大,脆性系数较高,物性较好的区域为泥页岩储层有利区域。对于泥页岩盖层,研究区岩石组分单元相对简单,利用Vsh公式在求取泥质含量的基础上,建立了无机矿物含量测井解释模型,并结合测井相的定性识别,利用“定量计算+定性识别”的方法对研究区岩相进行划分;然后利用测井资料完成了泥页岩盖层突破压力、物性参数、岩石力学参数等测井模型的建立,进而完成各单井的测井解释;在此基础上针对海上油田范围大且井少的特点,本文采用定量与定性相结合的方法;定量评价主要侧重于对盖层微观封闭能力的分析和总结,即利用测井解释的突破压力、孔隙度、渗透率、TOC含量等微观封闭性参数判断物性封闭、超压封闭、烃浓度封闭在该区的封闭作用。定性评价则侧重于对宏观地质条件的分析,如盖层厚度、成岩阶段和岩相展布等,最终实现对盖层的测井评价。
[Abstract]:In recent years, more and more attention has been paid to the study of shale oil and gas. In this paper, the mud shale reservoirs of the second member of Fu member in Subei Basin and the shale cap of Huagang and Pinghu formations in the central inversion structural belt of Xihu depression are taken as the research objects. On the basis of the basic geological research, the shale reservoirs in Subei Basin are studied. The logging data are used to evaluate the properties of reservoir and caprock in two study target layers of mudstone caprock in Xihu sag. Aiming at shale reservoir, the clay minerals in the rock are established according to the relation of "Mineralogy and electricity" on the basis of the standardization of logging data and the return of core depth. The relationship between feldspar minerals and carbonate minerals and the corresponding sensitive logging curves, and the calculation of organic carbon content in mudstone formation by logR method are used to identify and divide the lithofacies of shale reservoir, and the physical parameters are also given. The main evaluation parameters of shale reservoir, such as rock mechanics parameters, are established to realize the logging interpretation of each single well, and finally, according to its mineral composition, TOC content, fracture development degree and physical properties, the logging interpretation of each single well is realized. On the basis of geological research, the logging evaluation of mudstone thickness and other parameters is carried out by means of multi-factor superposition and geological analogy. It is considered that the area with higher favorable lithofacies thickness, higher brittleness coefficient and better physical properties is the favorable area for shale reservoir. For the shale caprock, the rock component unit in the study area is relatively simple. Based on the Vsh formula, a log interpretation model of inorganic mineral content is established, and the logging facies are identified qualitatively. The method of "quantitative calculation and qualitative identification" is used to divide the lithofacies in the study area, and then the logging model of shale cap rock breakthrough pressure, physical property parameter and rock mechanics parameter is established by using logging data. Then, the logging interpretation of each single well is completed. On this basis, in view of the characteristics of large scale and few wells in offshore oil fields, this paper adopts the combination of quantitative and qualitative methods, and the quantitative evaluation mainly focuses on the analysis and summary of the microcosmic sealing ability of caprock. That is, the microcosmic sealing parameters such as breakthrough pressure, porosity, permeability and TOC content of log interpretation are used to judge the sealing effect of physical property, overpressure and hydrocarbon concentration in this area. The qualitative evaluation focuses on the analysis of macroscopic geological conditions, such as the thickness of caprock, diagenesis stage and distribution of lithofacies, and finally realizes the logging evaluation of caprock.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P631.81

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