TB地区富县组有效储层测井评价研究

发布时间：2018-02-16 22:56

本文关键词： 储层特征四性关系测井解释储层识别　出处：《西安石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：TB地区富县组储层发育河流相沉积体系,曲流河沉积亚相,截止目前已有5个油藏投入开发,开发效果良好。由于富县组的沉积与延长组三角洲平原沉积差异,导致油藏富集规律的不同,表现出不同的测井响应特征,给测井解释造成了困难;同时部分油藏构造幅度较低,油水分异差,发育低阻油藏,油藏隐蔽性强;地层水性质局部有变化,造成了油水关系复杂。在目前的勘探开发形势下,急需开展有效储层识别及测井二次精细解释。为了快速、准确地评价油层,我们在油田不同井区进行了地层对比与划分;沉积相与砂体展布特征的研究;储层岩石学、孔隙结构、物性、非均质性等特征进行研究;建立测井解释模型,确定储层物性的下限值;利用图版法、视电阻率增大法、自然电位比值与电阻率交会法、声波时差与电阻率重叠法对研究区进行有效储层测井识别,为TB地区油田高效开发及扩大勘探开发成果提供有力的技术支撑。通过系统地分析,主要得到以下成果和认识:1、研究区富县组储层特征中沉积环境相对稳定,各小层砂顶构造特征均在平缓西倾单斜背景上发育低幅排状鼻状隆起;沉积相主要发育曲流河相沉积体系;岩石类型以长石岩屑砂岩和岩屑长石砂岩为主,分选中等,孔隙式胶结,面孔率整体偏低,孔喉类型以小孔微细喉为主;孔隙空间主要是粒间孔和粒间溶孔,且以粒间孔为主;储层喉道以缩颈型为主,片状或片弯状次之。2、TB地区富县组油藏受控于沉积、成岩、成藏等地质作用;储层非均质性较强,使得油气运移时,选择性充注主砂带高渗储层,低渗储层油气充注程度低、地层水残留。3、测井曲线经过标准化再结合“四性”关系研究成果、解释参数模型的建立和物性下限的确定。再根据试油成果,结合地质认识,利用图版法、视电阻增大率法、自然电位比值与电阻率交会法、声波时差与电阻率重叠法对全区进行有效储层识别,并建立了油水层的识别标准,根据试油效果确定了视电阻率增大法效果最好。4、依据研究出的识别标准对测井资料进行二次精细解释;TB地区富县组地层共解释出有效井96口,累计厚度441.2米,平均单井有效厚度4.3米,共提高21口井29个层解释结论,累计增加油层和油水同层厚度215米。
[Abstract]:Fluvial facies sedimentary system and meandering river sedimentary subfacies are developed in the reservoir of Fuxian formation in TB area. Up to now, five reservoirs have been developed and the development effect is good. As a result of different reservoir enrichment laws, different logging response characteristics appear, which makes logging interpretation difficult, and at the same time, some reservoirs have low structural amplitude, poor oil-water differentiation, low reservoir development, and strong reservoir concealment. The local variation of formation water property leads to the complexity of oil-water relationship. Under the present situation of exploration and development, effective reservoir identification and logging secondary fine interpretation are urgently needed. In order to evaluate reservoir quickly and accurately, We have carried out stratigraphic correlation and division in different well areas of the oil field, studied the distribution characteristics of sedimentary facies and sand bodies, studied the characteristics of reservoir petrology, pore structure, physical properties, heterogeneity, and established log interpretation models. Determining the lower limit of reservoir physical properties, using chart method, apparent resistivity increase method, natural potential ratio and resistivity intersection method, acoustic time difference and resistivity overlap method to identify the effective reservoir logging in the study area, This paper provides strong technical support for the high efficiency development of oil fields in TB area and the expansion of exploration and development achievements. Through systematic analysis, the following results and understanding 1 are obtained, and the sedimentary environment in the reservoir characteristics of Fuxian formation in the study area is relatively stable. The structural characteristics of sand roof of each substratum are all developed in the background of flat west inclination monoclinal low amplitude row nose uplift, the sedimentary facies mainly developed meandering river facies sedimentary system, the rock type is mainly feldspathic sandstone and lithic feldspathic sandstone, and the sorting is medium, the sedimentary facies are mainly composed of feldspathic sandstone and lithic feldspathic sandstone. Pore type cementation, the overall face rate is low, pore throat type is mainly micropore throat, pore space is mainly intergranular pore and intergranular dissolved pore, and intergranular pore, the throat channel of reservoir is neck-shrinking type, the pore space is mainly intergranular pore and intergranular dissolved pore, and the throat channel of reservoir is mainly necked. The reservoir of Fuxian formation is controlled by sedimentary, diagenetic and pool-forming geological processes, and the heterogeneity of reservoir is strong, which results in the high permeability reservoir in the main sand zone of selective filling and the low permeability reservoir in the migration of oil and gas, so that the reservoir of Fuxian formation is controlled by sedimentary, diagenetic and pool-forming geological processes, and the oil and gas filling degree of low permeability reservoir is low. The log curve is standardized and combined with the research results of "four properties" relation, the establishment of the interpretation parameter model and the determination of the lower limit of physical properties. According to the test results, combined with geological understanding, the chart method and apparent resistance increase rate method are used. The natural potential ratio and resistivity intersection method, acoustic time difference and resistivity overlap method are used to identify the reservoir in the whole area, and the identification standard of oil-water layer is established. According to the result of oil test, the method of increasing apparent resistivity is the best. According to the standard of identification, 96 effective wells have been interpreted in Fuxian formation of Fuxian formation in TB-area, with an accumulative thickness of 441.2 meters. The average effective thickness of single well is 4.3 meters, and the interpretation conclusion of 29 layers in 21 wells is improved, and the cumulative thickness of oil layer and oil water layer is increased by 215 meters.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE311;P618.13;P631.81

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