青西致密油储层测井评价研究

发布时间：2018-01-21 23:34

本文关键词： 致密油岩性识别储层物性地化参数可压裂性三品质评价　出处：《中国石油大学(华东)》2015年硕士论文　论文类型：学位论文

【摘要】：青西凹陷下沟组属于深湖半深湖相沉积,具有巨大的致密油开发潜力。本文从致密油储层的储层品质、烃源岩品质以及工程品质三个方面入手,分别对致密油储层的地球化学参数、岩性参数、矿物组分参数、物性参数以及可压裂性参数进行评价。地化指标评价方面,从地化实验资料出发,给出了有机碳含量(TOC)的计算方法;在获得地层的有机碳含量之后,结合岩心资料,拟合出了游离烃、热解烃和TOC的关系模型;选取镜质体反射率、热解最大峰温度和热成熟度指数作为评价有机质成熟度的指标,分别给出了这三个指标的计算模型,并在此基础上划分了研究区的有机质类型。岩性评价方面,应用细粒沉积岩的概念,结合该地区全岩分析实验得到的矿物组分含量对该地区岩性进行了重新定名与划分,对岩性特征进行了重新分析,结合测井曲线划分岩性,确定不同岩性的测井曲线特征。在此基础上,通过交会图分析确定了不同岩性对应的测井曲线敏感性,通过Bayes判别分析方法,建立判别方程,实现了岩性的定量划分。矿物组分含量评价方面,通过分析全岩分析矿物组分,确定了地区主要矿物组分为砂质、白云石以及粘土。借鉴M、N交会图的定义,应用岩性参数TM、TN、TP建立了矿物组分含量模型。物性评价方面,明确了物性影响因素以及地区物性特征,建立了在岩性识别基础上分岩性的孔隙度计算模型。由于地区岩性致密,渗透率主要受到裂缝的影响,结合常规测井与电成像图,建立了基于裂缝评价的渗透率计算模型。由于地区自生自储的成藏模式,认为含油饱和度与岩石矿物组分有很大关系,建立了以矿物组分为基础的含油饱和度计算模型。在可压裂性研究方面,以岩心实验为刻度建立了适合本地区的评价模型,应用声波测井资料获取了地层的弹性参数、强度参数、地应力、破裂压力和脆性指数,从而为致密油储层的地应力分析和压力改造奠定了基础。
[Abstract]:Xiagou formation in Qingxi sag belongs to deep lake semi-deep lacustrine facies and has great potential for development of dense oil. This paper starts with three aspects of reservoir quality source rock quality and engineering quality of tight oil reservoir. The geochemical parameters, lithologic parameters, mineral component parameters, physical parameters and fracturing parameters of tight oil reservoir are evaluated respectively. The calculation method of organic carbon content (TOC) is given. After the organic carbon content of the formation is obtained, the relationship model of free hydrocarbon, pyrolytic hydrocarbon and TOC is fitted according to the core data. The vitrinite reflectance, the maximum pyrolysis peak temperature and the thermal maturity index are selected as indicators to evaluate the maturity of organic matter, and the calculation models of these three indexes are given respectively. On the basis of this, the concept of fine grain sedimentary rock is applied in the evaluation of the lithology of organic matter in the study area. The lithology of this area is renamed and divided according to the mineral component content obtained from the whole rock analysis experiment in this area. The lithologic characteristics are reanalyzed and the lithology is divided by well logging curve. On the basis of this, the sensitivity of logging curves corresponding to different lithology is determined by cross plot analysis, and the discriminant equation is established by Bayes discriminant analysis method. The quantitative division of lithology and the evaluation of mineral component content are realized. By analyzing the mineral components of the whole rock, the main mineral components in the area are determined as sandy, dolomite and clay. The definition of Mon N cross plot is used for reference. The mineral component content model was established by using the lithologic parameter TMN / TNTP. In the aspect of physical property evaluation, the influence factors of physical property and the regional physical characteristics were determined. The porosity calculation model based on lithology recognition is established. Due to the density of lithology in the area, permeability is mainly affected by fractures, combined with conventional logging and electrical imaging. A permeability calculation model based on fracture evaluation has been established. Due to the reservoir formation model of self-generation and self-reservoir in the region, it is considered that the oil saturation has a great relationship with the composition of rock and minerals. A calculation model of oil saturation based on mineral components is established. In the study of fracturability, an evaluation model suitable for this area is established based on core experiments. The elastic parameters, strength parameters, in-situ stress, fracture pressure and brittleness index were obtained by using acoustic logging data, which laid a foundation for the in-situ stress analysis and pressure reconstruction of tight oil reservoirs.
【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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