洛伊地区三叠系致密砂岩测井解释评价方法研究

发布时间：2018-01-11 09:36

本文关键词：洛伊地区三叠系致密砂岩测井解释评价方法研究　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着石油勘探开发程度的逐渐加深,致密砂岩气藏的经济价值逐渐被人们所认识,其勘探开发已经成为国内外石油工业的研究热点和前沿问题。但复杂的成因以及裂缝的发育等,使得致密砂岩储层具有岩性致密、低孔隙度、低渗透率、储层非均质性强和气水关系复杂等特点,这给致密砂岩储层测井解释评价研究增加了难度。洛伊地区三叠系致密砂岩储层是本次研究的目的层段。由于该区属于致密砂岩储层,加之勘探程度较低,测井评价过程中存在如下主要问题：①储层裂缝特征研究没有深入开展,裂缝评价仅限于定性说明；②常规测井资料识别流体困难；③区块无邻井试油资料,没有建立定量的解释标准,准确评价致密砂岩含气饱和度困难。因此,开展洛伊地区三叠系致密砂岩测井解释评价研究,建立一套合适的测井评价标准,为油田下一步勘探开发提供依据,具有十分重要的作用和意义。本文在前期文献调研的基础上,结合收集的常规测井资料以及岩心物性、水分析、成像测井资料,从储层四性关系、裂缝识别及有效性评价、储层参数模型建立、储层流体性质识别与测井资料综合处理等方面进行测井解释评价方法研究。研究认为：①谭庄组和椿树腰组储层矿物成分类似,岩性以岩屑砂岩、岩屑长石砂岩、长石岩屑砂岩为主,谭庄组孔隙度为0.6%～12%,渗透率在(0.017～1.38)×10-31,tm2,椿树腰组孔隙度为0.4%～8.2%,渗透率在(0.015～19.1)×10-3μm2,均属于特低孔、特低渗致密砂岩储层。②本区裂缝较发育,主要发育角度较大的斜交缝和高角度缝,总体上谭庄组段裂缝比椿树腰组发育。并应用岩心渗透率增大系数法和成像测井法评价裂缝有效性。另分析了岩石颗粒粗细、岩石中钙质、白云质成分含量、泥质含量等对裂缝发育的影响。③采用“岩心刻度测井”方法,建立研究区常规储层参数计算模型；运用阿尔奇公式(岩电实验分析确定a、b、m、n值)计算含水饱和度。④运用了4种流体性质判别方法,其中模糊概率法、纵横波速度比值法效果较好,电阻率与声波、密度交会法次之。⑤运用经验统计法和试气点约束法确定了储层孔渗下限,结合试油、录井及测井资料,根据绘制的试油层位电阻率与孔隙度交会图确定谭庄组和椿树腰组含气饱和度下限值。本论文的完成为洛伊地区三叠系致密砂岩储层特征分析、储层参数模型的建立、流体识别和储层下限及解释标准的建立方面提供了一套切实可行的方法,为全面开展洛伊地区三叠系致密砂岩储层的勘探开发提供了夯实的测井解释依据。
[Abstract]:With the deepening of petroleum exploration and development, the economic value of tight sandstone gas reservoir is gradually recognized. Its exploration and development has become the research hotspot and frontier problem of petroleum industry at home and abroad, but the complex genesis and the development of fractures make the tight sandstone reservoir have tight lithology, low porosity and low permeability. The strong heterogeneity of reservoir and the complex relationship between gas and water increase the difficulty of logging interpretation and evaluation of tight sandstone reservoir. Triassic tight sandstone reservoir is the target formation of this study, because this area belongs to tight sandstone reservoir, and the exploration degree is low. In the process of logging evaluation, the following main problems exist: the research on fracture characteristics of reservoir W1 has not been carried out thoroughly, and the fracture evaluation is limited to qualitative explanation; (2) it is difficult to identify fluid by conventional logging data; In block 3, there are no adjacent well test data, no quantitative interpretation standard has been established, and it is difficult to accurately evaluate the gas saturation of tight sandstone. Therefore, the study on interpretation and evaluation of Triassic tight sandstone logging in Loy area is carried out. It is of great importance and significance to establish a set of appropriate logging evaluation criteria to provide the basis for the exploration and development of oil fields in the next step. Based on the previous literature research, this paper combines the conventional logging data and core physical properties, water analysis, imaging logging data, from the relationship between the four properties of reservoir, fracture identification and effectiveness evaluation. The reservoir parameter model, reservoir fluid property identification and logging data comprehensive processing are studied in logging interpretation and evaluation methods. It is considered that the reservoir mineral composition of the W1 Tanzhuang formation and the Chunshuyao formation is similar to that of the Chunshuyao formation. Lithology is dominated by lithic sandstone, lithic feldspar sandstone, feldspathic sandstone, porosity of Tan Zhuang formation is 0.612 and permeability is 0.017 ~ 1.38) 脳 10 ~ (-31) m ~ 2. The porosity of the Chunshu waist formation is 0.4 ~ 8.2, and the permeability is 0.015 ~ 19.1 脳 10 ~ (-3) 渭 m ~ (2), all of them belong to ultra-low porosity, and the fracture of this area is relatively developed in the area of ultra-low permeability tight sandstone reservoir .2. The main development angle of oblique seam and high angle seam. On the whole, the fractures in the Tan Zhuang formation are more developed than those in the Chunshuyao formation. The core permeability increase coefficient method and imaging logging method are used to evaluate the validity of the fractures. In addition, the size of the rock particles, the content of calcium in the rock and the dolomite composition are analyzed. The influence of mud content on fracture development. 3. By using "core calibration logging" method, the conventional reservoir parameter calculation model in the study area is established. By using Archie formula (rock electricity experimental analysis to determine the value of a bbmnn), four methods are used to judge the water saturation. Among them, the fuzzy probability method and the velocity ratio method of longitudinal and shear waves are more effective. The resistivity and acoustic wave and density intersection method are used to determine the lower limit of reservoir porosity and permeability by means of empirical statistics method and gas test point constraint method combined with oil testing logging and logging data. Based on the plotted plot of resistivity and porosity, the lower limit of gas saturation of Tanzhuang formation and Chunshuyao formation is determined. The completion of this paper provides a set of feasible methods for the analysis of the characteristics of Triassic tight sandstone reservoir, the establishment of reservoir parameter model, fluid identification and the establishment of reservoir lower limit and interpretation standard. It provides a solid log interpretation basis for the exploration and development of the Triassic tight sandstone reservoir in the Loy area.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P631.81

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