【摘要】：為了滿足國(guó)內(nèi)各行業(yè)對(duì)能源的不斷需求,石油行業(yè)面臨著非常嚴(yán)峻的形式。永寧油田永554井區(qū)資源潛力較大,作為進(jìn)一步投入開發(fā)的后備區(qū),本區(qū)長(zhǎng)6的沉積相、儲(chǔ)層以及成藏的研究比較薄弱,缺乏系統(tǒng)性和深入性,從而制約了對(duì)該區(qū)油氣富集規(guī)律的深入認(rèn)識(shí)。前人通過對(duì)大量基礎(chǔ)資料的分析研究,對(duì)研究區(qū)地層沉積特征、油藏特征及油氣富集規(guī)律有了明確的認(rèn)識(shí),但隨油藏注水開發(fā)全面開展及開發(fā)中后期剩余油挖潛及油藏綜合調(diào)整實(shí)踐要求,有必要對(duì)儲(chǔ)層進(jìn)行精細(xì)研究,對(duì)儲(chǔ)層的巖石學(xué)、成巖作用、物性、孔隙結(jié)構(gòu)、非均質(zhì)性以及滲流等特征進(jìn)行詳細(xì)剖析,建立儲(chǔ)層分類標(biāo)準(zhǔn),并進(jìn)一步對(duì)儲(chǔ)層進(jìn)行評(píng)價(jià),為綜合調(diào)整及剩余油挖潛措施提供優(yōu)化依據(jù),使該油藏合理高效開發(fā)。因此針對(duì)以上問題,本論文重點(diǎn)開展了永寧油田永554井區(qū)長(zhǎng)6油層組油藏特征研究,并完成了以下內(nèi)容的研究：1)區(qū)域構(gòu)造、地層特征分析：2)儲(chǔ)層巖石學(xué)和成巖作用分析；3)儲(chǔ)層物性、孔隙結(jié)構(gòu)及非均質(zhì)性研究；4)儲(chǔ)層分類及評(píng)價(jià)；5)油藏特征研究及儲(chǔ)量計(jì)算,這對(duì)于該區(qū)今后進(jìn)一步勘探開發(fā)具有一定的指導(dǎo)意義。最終得到以下結(jié)論：1)永554井區(qū)延長(zhǎng)組長(zhǎng)6油層組為大型內(nèi)陸淡水湖泊河控三角洲沉積,具有淺水、緩坡的特征。三角洲以平原分流河道、前緣水下分流河道沉積為主三角洲前緣河口砂壩不發(fā)育：2)長(zhǎng)6油層組砂巖礦物組成主要為長(zhǎng)石(61.6%)、石英(16.2%)、巖屑(9.96%)和少量的云母及填隙物,砂巖粒度φ值總體分布在2～4范圍內(nèi),平均為3.50,屬于細(xì)粒砂巖：粒度分析標(biāo)準(zhǔn)偏差平均為0.49,偏度平均為0.13,呈正偏態(tài),表明長(zhǎng)6油層組砂巖的分選性較好,粒度分析尖度平均值為0.9,顯示沉積物來源以單物源為主：3)長(zhǎng)6儲(chǔ)層成巖作用主要包括壓實(shí)及壓溶、膠結(jié)充填和溶蝕作用,綜合長(zhǎng)6油層鏡質(zhì)體反射率(Ro)、成巖礦物以及孔隙特征分析,永554井區(qū)長(zhǎng)6油層組砂巖已進(jìn)入中成巖A期；4)長(zhǎng)6儲(chǔ)層主要發(fā)育殘余粒間孔隙和溶蝕孔隙等類型,孔隙度主要分布在4.0～14.0%之間,平均值為9.6%；滲透率主要分布在0.01～4.01×10-3μm2之間,平均值為0.62×10-3μm2；平均孔徑一般分布在9.8μm～52.0μm之間,平均為27.89μm；平均吼道直徑分布在0.20μm～0.66μm之間,平均為0.44μm,屬小孔-細(xì)喉型和小孔-微細(xì)喉型：5)長(zhǎng)6油層組砂巖儲(chǔ)層的毛管壓力曲線及其孔喉組合關(guān)系劃分為三種類型,其中Ⅰ類孔隙結(jié)構(gòu)的儲(chǔ)層占到33.3%,Ⅱ類孔隙結(jié)構(gòu)的儲(chǔ)層占到55.6%,Ⅲ類孔隙結(jié)構(gòu)的儲(chǔ)層占到11.1%,本區(qū)以Ⅱ類孔隙結(jié)構(gòu)的儲(chǔ)層為主；6)本區(qū)長(zhǎng)6油層組砂巖具有中-強(qiáng)的層內(nèi)非均質(zhì)性,并通過對(duì)永554井區(qū)長(zhǎng)6油層組綜合研究,最終評(píng)價(jià)認(rèn)為本區(qū)儲(chǔ)層為特低滲透儲(chǔ)層,其中以Ⅲb類和Ⅳa類儲(chǔ)層為主,占到66.33%,其次為Ⅳb類,占到21.67%；7)通過油藏溫度-壓力分析,結(jié)果表明本區(qū)長(zhǎng)6油層組屬于常溫、低壓油藏；8)長(zhǎng)6油層組油藏具有低密度、低粘度、低凝固點(diǎn)的特點(diǎn),平均飽和壓力4.01MPa,平均體積系數(shù)1.241,平均收縮率17%,平均氣油比52m3/m3(62m3/t),地層水pH值在5.74～7.00之間,平均值為6.48,屬弱酸性,總礦化度主要分布在46388.09～70636.70mg/l之間,平均56195.72mg/l,水型主要為CaCl2型；9)長(zhǎng)6油層組砂巖儲(chǔ)層隨著含水飽和度的增加,油相的相對(duì)滲透率下降、水相的相對(duì)滲透率迅速上升,地層原始含水飽和度高于束縛水飽和度,含水飽和度處于兩相滲流區(qū)；注入倍數(shù)與油井含水率、注入倍數(shù)與含水飽和度均呈正相關(guān)關(guān)系,隨著注入倍數(shù)的增加,含水飽和度與油井含水率增加較快；10)依據(jù)永554井區(qū)長(zhǎng)6油層組彈性-溶解氣驅(qū)特低孔滲砂巖巖性油藏的各項(xiàng)儲(chǔ)量參數(shù)取值,采用容積法計(jì)算出本區(qū)長(zhǎng)6油層組的探明石油地質(zhì)儲(chǔ)量為1202.36×104m3(1000.36×104t),疊合含油面積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，

本文編號(hào)：2452587