發(fā)布時(shí)間：2018-05-11 23:03

  本文選題：鄂爾多斯盆地 + 旬邑地區(qū)　； 參考：《西北大學(xué)》2017年碩士論文

【摘要】：三疊系延長組長8油層組是鄂爾多斯盆地主力產(chǎn)油層系之一,但盆地南部渭北隆起北部旬邑地區(qū)長8油層組研究程度相對低,雖然前人對其進(jìn)行過不同程度的研究,但較為零散,缺乏系統(tǒng)的研究。本文以石油地質(zhì)學(xué)、儲層沉積學(xué)等多學(xué)科為理論指導(dǎo)依據(jù),綜合各種分析測試實(shí)驗(yàn),對旬邑地區(qū)長8油層組進(jìn)行儲層巖石學(xué)特征、微觀孔喉特征、物性特征、非均質(zhì)性以及成巖作用等特征的研究,歸納出影響研究區(qū)長8儲層物性的關(guān)鍵因素,最終對目的層長8油層組進(jìn)行儲層分類與評價(jià)。旬邑地區(qū)長8期主要發(fā)育的沉積相類型為三角洲前緣亞相、淺湖亞相,其中主要發(fā)育兩條近乎南北向展布的三角洲前緣水下分流河道,砂體分布范圍穩(wěn)定,縱向上砂泥互層,互層砂為長8儲層特征砂體的主要類型。研究區(qū)長8儲層砂巖具混源特征,主要是巖屑長石砂巖和長石巖屑砂巖,石英、長石、巖屑含量差異小,均顯示較低的成分成熟度以及結(jié)構(gòu)成熟度。長8儲層填隙物含量平均值為18.16%,其中膠結(jié)物以碳酸鹽膠結(jié)物、粘土礦物、硅質(zhì)為主�？紫抖葷B透率數(shù)值總體較低,儲層物性較差;長8整體上表現(xiàn)為儲層非均質(zhì)性強(qiáng)烈,并且長82小層較長81小層非均質(zhì)性更強(qiáng)。研究區(qū)長8儲層致密,顆粒接觸主要為線狀、鋸齒狀接觸�？紫额愋椭饕獮槿芪g孔,其次為殘余粒間孔,微裂隙與晶間孔則發(fā)育較少。喉道類型以縮頸型喉道為主,其次為彎片狀,喉道連通性差別較大,孔喉特征總體上表現(xiàn)為強(qiáng)的結(jié)構(gòu)非均質(zhì)性,毛管壓力以Ⅱ類為主,其次是Ⅲ類。研究區(qū)長8儲層成巖階段主要為晚成巖A期,壓實(shí)壓溶作用致使研究區(qū)長8儲層孔隙喪失59%,碳酸鹽膠結(jié)、粘土膠結(jié)以及硅質(zhì)膠結(jié)則致使孔隙減少了 38%,溶蝕作用及裂縫增加儲層孔隙、提高儲層滲流能力,進(jìn)而改善了儲層物性。綜合研究區(qū)長8儲層各種參數(shù)特征,將目的層長8儲層主要劃分為五種成巖相。構(gòu)造作用、沉積相、成巖相、孔喉結(jié)構(gòu)特征共同影響長8儲層物性,整體上長81小層較長82小層物性更好。研究區(qū)長8共發(fā)育有四類儲層,其中以Ⅱ類、Ⅲ類儲層為主,Ⅱ類儲層物性較好,具有實(shí)際勘探開發(fā)意義,其中長81小層較長82小層Ⅱ類儲層明顯發(fā)育,分布范圍顯著增加。
[Abstract]:The Chang 8 formation of the Yanchang formation of the Triassic is one of the main oil-producing strata in the Ordos basin, but the study degree of Chang 8 oil formation in Xunyi region in the northern part of Weibei uplift in the southern part of the basin is relatively low, although the former has studied it to different degrees. But more scattered, lack of systematic research. Taking petroleum geology and reservoir sedimentology as theoretical basis and synthesizing all kinds of analysis and test experiments, this paper carries out reservoir petrological characteristics, microscopic pore throat characteristics and physical properties of Chang 8 formation in Xunyi area. Based on the study of heterogeneity and diagenesis, the key factors affecting the physical properties of Chang8 reservoir in the study area are summarized. Finally, the reservoir classification and evaluation of Chang8 reservoir group are carried out. The main sedimentary facies of Chang8 period in Xunyi area are delta front subfacies and shallow lacustrine subfacies. Among them, there are mainly two subaqueous distributary channels near the north and south delta front. The distribution range of sand body is stable, and the sand and mud interbedded longitudinally. Interbed sand is the main type of sand body in Chang 8 reservoir. The sandstone of Chang 8 reservoir in the study area has mixed source characteristics, mainly lithic feldspathic sandstone and feldspathic sandstone, quartz, feldspar, lithic debris content difference is small, all show lower compositional maturity and structure maturity. The average content of interstitial matter in Chang 8 reservoir is 18.16, in which carbonate cementation, clay mineral and siliceous are the main cement. The porosity and permeability values are lower and the reservoir physical properties are poor, and Chang 8 is characterized by strong reservoir heterogeneity and stronger heterogeneity of Chang 82 layer than long 81 layer. Chang 8 reservoir is compact, grain contact is mainly linear and serrated contact. The pore types are mainly dissolved pores, followed by residual intergranular pores, while microcracks and intergranular pores are less developed. The throat type was mainly neck-necked throat, followed by curved flake throat, and the throat connectivity was different. The pore throat was characterized by strong structural heterogeneity, capillary pressure was mainly of type 鈪，

本文編號：1876002