永宁油田永554井区长6油层组油藏描述
发布时间：2019-04-02 13:06
【摘要】：为了满足国内各行业对能源的不断需求,石油行业面临着非常严峻的形式。永宁油田永554井区资源潜力较大,作为进一步投入开发的后备区,本区长6的沉积相、储层以及成藏的研究比较薄弱,缺乏系统性和深入性,从而制约了对该区油气富集规律的深入认识。前人通过对大量基础资料的分析研究,对研究区地层沉积特征、油藏特征及油气富集规律有了明确的认识,但随油藏注水开发全面开展及开发中后期剩余油挖潜及油藏综合调整实践要求,有必要对储层进行精细研究,对储层的岩石学、成岩作用、物性、孔隙结构、非均质性以及渗流等特征进行详细剖析,建立储层分类标准,并进一步对储层进行评价,为综合调整及剩余油挖潜措施提供优化依据,使该油藏合理高效开发。因此针对以上问题,本论文重点开展了永宁油田永554井区长6油层组油藏特征研究,并完成了以下内容的研究：1)区域构造、地层特征分析：2)储层岩石学和成岩作用分析；3)储层物性、孔隙结构及非均质性研究；4)储层分类及评价；5)油藏特征研究及储量计算,这对于该区今后进一步勘探开发具有一定的指导意义。最终得到以下结论：1)永554井区延长组长6油层组为大型内陆淡水湖泊河控三角洲沉积,具有浅水、缓坡的特征。三角洲以平原分流河道、前缘水下分流河道沉积为主三角洲前缘河口砂坝不发育：2)长6油层组砂岩矿物组成主要为长石(61.6%)、石英(16.2%)、岩屑(9.96%)和少量的云母及填隙物,砂岩粒度φ值总体分布在2～4范围内,平均为3.50,属于细粒砂岩：粒度分析标准偏差平均为0.49,偏度平均为0.13,呈正偏态,表明长6油层组砂岩的分选性较好,粒度分析尖度平均值为0.9,显示沉积物来源以单物源为主：3)长6储层成岩作用主要包括压实及压溶、胶结充填和溶蚀作用,综合长6油层镜质体反射率(Ro)、成岩矿物以及孔隙特征分析,永554井区长6油层组砂岩已进入中成岩A期；4)长6储层主要发育残余粒间孔隙和溶蚀孔隙等类型,孔隙度主要分布在4.0～14.0%之间,平均值为9.6%；渗透率主要分布在0.01～4.01×10-3μm2之间,平均值为0.62×10-3μm2；平均孔径一般分布在9.8μm～52.0μm之间,平均为27.89μm；平均吼道直径分布在0.20μm～0.66μm之间,平均为0.44μm,属小孔-细喉型和小孔-微细喉型：5)长6油层组砂岩储层的毛管压力曲线及其孔喉组合关系划分为三种类型,其中Ⅰ类孔隙结构的储层占到33.3%,Ⅱ类孔隙结构的储层占到55.6%,Ⅲ类孔隙结构的储层占到11.1%,本区以Ⅱ类孔隙结构的储层为主；6)本区长6油层组砂岩具有中-强的层内非均质性,并通过对永554井区长6油层组综合研究,最终评价认为本区储层为特低渗透储层,其中以Ⅲb类和Ⅳa类储层为主,占到66.33%,其次为Ⅳb类,占到21.67%；7)通过油藏温度-压力分析,结果表明本区长6油层组属于常温、低压油藏；8)长6油层组油藏具有低密度、低粘度、低凝固点的特点,平均饱和压力4.01MPa,平均体积系数1.241,平均收缩率17%,平均气油比52m3/m3(62m3/t),地层水pH值在5.74～7.00之间,平均值为6.48,属弱酸性,总矿化度主要分布在46388.09～70636.70mg/l之间,平均56195.72mg/l,水型主要为CaCl2型；9)长6油层组砂岩储层随着含水饱和度的增加,油相的相对渗透率下降、水相的相对渗透率迅速上升,地层原始含水饱和度高于束缚水饱和度,含水饱和度处于两相渗流区；注入倍数与油井含水率、注入倍数与含水饱和度均呈正相关关系,随着注入倍数的增加,含水饱和度与油井含水率增加较快；10)依据永554井区长6油层组弹性-溶解气驱特低孔渗砂岩岩性油藏的各项储量参数取值,采用容积法计算出本区长6油层组的探明石油地质储量为1202.36×104m3(1000.36×104t),叠合含油面积18.2km2。
[Abstract]:In order to meet the domestic demand for energy, the oil industry faces a very serious form. As a reserve area for further input and development, the study of the sedimentary facies, reservoir and reservoir formation in Yongning Oilfield is relatively weak and lacks systematicness and in-depth, thus restricting the in-depth understanding of the law of oil and gas enrichment in this area. Through the analysis of a large number of basic data, the authors have made a clear understanding of the characteristics of the formation, the characteristics of the reservoir and the law of oil and gas enrichment in the study area, but with the development of the reservoir water injection and the development of the residual oil and the comprehensive adjustment of the reservoir in the middle and later stages of the development, It is necessary to make a detailed study of the reservoir, to analyze the petrology, diagenesis, physical property, pore structure, heterogeneity and seepage of the reservoir, to establish the reservoir classification standard and to further evaluate the reservoir. To provide the optimum basis for comprehensive adjustment and residual oil extraction, so that the reservoir can be developed in a reasonable and efficient way. Therefore, in view of the above problems, this paper focuses on the study of the reservoir characteristics of the Chang 6 reservoir group in the Chang-4 well of Yongning Oilfield, and completed the following research:1) regional structure, formation analysis:2) reservoir petrology and diagenesis analysis;3) reservoir physical property, The study of pore structure and heterogeneity;4) reservoir classification and evaluation;5) reservoir characteristic research and reserve calculation, which has certain guiding significance for further exploration and development of this area. The following conclusions are finally obtained:1) The Chang-6 oil-layer group of the Yanchang Formation in Yong554 well area is a large-scale inland fresh-water lake, the river-controlled delta is deposited, and has the characteristics of shallow water and gentle slope. The delta is divided into a plain distributary channel and a leading edge subaqueous distributary channel is deposited as the main delta front mouth sand dam.2) The sandstone mineral composition of the Chang 6 oil layer group is mainly feldspar (61.6%), quartz (16.2%), rock cuttings (9.96%) and a small amount of mica and a filler. The average distribution of the grain size of the sandstone is within the range of 2 to 4, with an average of 3.50, and belongs to the fine-grained sandstone. The average standard deviation of the particle size analysis is 0.49, the average deviation is 0.13, and the deviation is positive, indicating that the sandstone in the long 6-layer group has good sorting property, and the average value of the particle size analysis is 0.9. The main source of sediment is as follows:3) The diagenesis of Chang 6 reservoir mainly includes compaction and pressure dissolution, cementation and dissolution, and comprehensive long 6 reservoir vitrinite reflectance (Ro), diagenetic mineral and pore characteristics. The sandstone of the 6-reservoir group in the Chang-6 reservoir is in the middle-diagenetic phase A;4) the long 6 reservoir mainly develops the types of residual intergranular pores and dissolved pores, the porosity is mainly distributed between 4.0 and 14.0%, the average value is 9.6%, and the permeability is mainly distributed between 0.01 and 4.01-10-3. m The average pore size is 0.62 to 10-3. m u.m2; the average pore size is generally between 9.8 & mu; m and 52.0. m u.m, with an average of 27.89. m u.m; and the average diameter distribution is between 0.20 and 0.66. m u.m, with an average of 0.44. m u.m, belonging to the small-hole-fine-throat type and the small-pore-micro-throat type: 5) The capillary pressure curve and the pore-throat composition of the sandstone reservoir in the Chang 6 reservoir group are divided into three types, in which the reservoir of the class I pore structure accounts for 33.3%, the reservoir of the class II pore structure accounts for 55.6%, and the reservoir of the class III pore structure accounts for 11.1%. In this area, the reservoir with type 鈪，
本文编号：2452587
[Abstract]:In order to meet the domestic demand for energy, the oil industry faces a very serious form. As a reserve area for further input and development, the study of the sedimentary facies, reservoir and reservoir formation in Yongning Oilfield is relatively weak and lacks systematicness and in-depth, thus restricting the in-depth understanding of the law of oil and gas enrichment in this area. Through the analysis of a large number of basic data, the authors have made a clear understanding of the characteristics of the formation, the characteristics of the reservoir and the law of oil and gas enrichment in the study area, but with the development of the reservoir water injection and the development of the residual oil and the comprehensive adjustment of the reservoir in the middle and later stages of the development, It is necessary to make a detailed study of the reservoir, to analyze the petrology, diagenesis, physical property, pore structure, heterogeneity and seepage of the reservoir, to establish the reservoir classification standard and to further evaluate the reservoir. To provide the optimum basis for comprehensive adjustment and residual oil extraction, so that the reservoir can be developed in a reasonable and efficient way. Therefore, in view of the above problems, this paper focuses on the study of the reservoir characteristics of the Chang 6 reservoir group in the Chang-4 well of Yongning Oilfield, and completed the following research:1) regional structure, formation analysis:2) reservoir petrology and diagenesis analysis;3) reservoir physical property, The study of pore structure and heterogeneity;4) reservoir classification and evaluation;5) reservoir characteristic research and reserve calculation, which has certain guiding significance for further exploration and development of this area. The following conclusions are finally obtained:1) The Chang-6 oil-layer group of the Yanchang Formation in Yong554 well area is a large-scale inland fresh-water lake, the river-controlled delta is deposited, and has the characteristics of shallow water and gentle slope. The delta is divided into a plain distributary channel and a leading edge subaqueous distributary channel is deposited as the main delta front mouth sand dam.2) The sandstone mineral composition of the Chang 6 oil layer group is mainly feldspar (61.6%), quartz (16.2%), rock cuttings (9.96%) and a small amount of mica and a filler. The average distribution of the grain size of the sandstone is within the range of 2 to 4, with an average of 3.50, and belongs to the fine-grained sandstone. The average standard deviation of the particle size analysis is 0.49, the average deviation is 0.13, and the deviation is positive, indicating that the sandstone in the long 6-layer group has good sorting property, and the average value of the particle size analysis is 0.9. The main source of sediment is as follows:3) The diagenesis of Chang 6 reservoir mainly includes compaction and pressure dissolution, cementation and dissolution, and comprehensive long 6 reservoir vitrinite reflectance (Ro), diagenetic mineral and pore characteristics. The sandstone of the 6-reservoir group in the Chang-6 reservoir is in the middle-diagenetic phase A;4) the long 6 reservoir mainly develops the types of residual intergranular pores and dissolved pores, the porosity is mainly distributed between 4.0 and 14.0%, the average value is 9.6%, and the permeability is mainly distributed between 0.01 and 4.01-10-3. m The average pore size is 0.62 to 10-3. m u.m2; the average pore size is generally between 9.8 & mu; m and 52.0. m u.m, with an average of 27.89. m u.m; and the average diameter distribution is between 0.20 and 0.66. m u.m, with an average of 0.44. m u.m, belonging to the small-hole-fine-throat type and the small-pore-micro-throat type: 5) The capillary pressure curve and the pore-throat composition of the sandstone reservoir in the Chang 6 reservoir group are divided into three types, in which the reservoir of the class I pore structure accounts for 33.3%, the reservoir of the class II pore structure accounts for 55.6%, and the reservoir of the class III pore structure accounts for 11.1%. In this area, the reservoir with type 鈪，
本文编号：2452587
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