【摘要】：研究區(qū)位于鄂爾多斯盆地伊陜斜坡東南部的延長縣東區(qū),目的層為盒8,根據(jù)沉積旋回及輔助標(biāo)志層自下而上將盒8分為盒8下和盒8上。本次研究是在測(cè)井、錄井、鉆井、試油試采等資料和實(shí)驗(yàn)分析資料的基礎(chǔ)上,運(yùn)用現(xiàn)代地質(zhì)理論和各種處理軟件,進(jìn)行系統(tǒng)的地層對(duì)比、沉積相及砂層展布和儲(chǔ)層綜合地質(zhì)特征的研究,查明盒8砂巖儲(chǔ)層空間發(fā)育和分布規(guī)律,建立本區(qū)盒8儲(chǔ)層評(píng)價(jià)綜合分類標(biāo),從而對(duì)盒8進(jìn)行綜合分類評(píng)價(jià)。延長東區(qū)盒8上和盒8下地層厚度均較穩(wěn)定,橫向變化小,與盒8上相比盒8下地層則較厚;從東西向剖面上來看,地層總體為一個(gè)西傾單斜,由西到東地層逐漸抬升,從南北向剖面上來看,北部至中部地層變化相對(duì)平緩,南部地區(qū)有所抬升,但抬升幅度較東西向小,發(fā)育鼻隆構(gòu)造。三角洲前緣亞相沉積,物源方向來自東北方向,水下分流河道及河口壩主體發(fā)育區(qū)內(nèi)砂體厚、規(guī)模大、巖性均勻、物性較好,是優(yōu)質(zhì)儲(chǔ)層發(fā)育的主要區(qū)帶;巖性主要為中粒巖屑砂巖及少量巖屑石英砂巖和石英砂巖;盒8屬于特低孔特低滲透儲(chǔ)層,其中盒8上物性比盒8下好。粘土礦物有綠泥石、伊利石、高嶺石、伊/蒙間層等,以伊利石為主,沒有蒙皂石;成巖作用強(qiáng)烈,成巖演化階段達(dá)到晚成巖B期;孔隙類型主要有巖屑溶孔、長石溶孔、粒間孔、晶間孔、粒間溶孔及微裂縫等,以巖屑溶孔與長石溶孔為主;微觀結(jié)構(gòu)以細(xì)~小孔細(xì)喉為主。儲(chǔ)層具有較強(qiáng)非均質(zhì)性,儲(chǔ)層厚度及孔、滲受沉積相帶控制,具有一定方向性。根據(jù)儲(chǔ)層評(píng)價(jià)綜合分類標(biāo)準(zhǔn),將和儲(chǔ)層分為Ⅰ、Ⅱ、Ⅲ、Ⅳ共四種類型,分別對(duì)應(yīng)好儲(chǔ)層、中等儲(chǔ)層、差儲(chǔ)層及非儲(chǔ)層;盒8上與盒8下均以Ⅲ類和Ⅳ類儲(chǔ)層為主。
[Abstract]:The study area is located in the eastern part of Yanchang County in the southeast of Yishan slope in Ordos Basin. The target layer is Box 8. Box 8 is divided into box 8 and box 8 from bottom to top according to sedimentary cycle and auxiliary marker layer. This study is based on the data of logging, drilling, oil testing and production testing and experimental analysis, using modern geological theory and various processing software to carry out systematic stratigraphic correlation. Based on the study of sedimentary facies and sand distribution and the comprehensive geological characteristics of reservoir, the spatial development and distribution law of box 8 sandstone reservoir are found out, and the comprehensive classification standard of reservoir evaluation of box 8 in this area is established, and the comprehensive classification evaluation of box 8 is carried out. In Yanchang Eastern District, the thickness of upper and lower layers of box 8 is stable, the lateral change is small, and the lower layer of box 8 is thicker than that of box 8. Looking from the EW profile, the strata are generally a westward inclination monoclinal, gradually uplifting from the west to the east. From the south to the north profile, the stratigraphic changes from the north to the middle are relatively smooth, and the southern region is uplifted, but the extent of uplift is smaller than that in the east and west. Develop rhinostomy structure. The delta front subfacies deposit, the source direction comes from the northeast direction, the underwater distributary channel and the estuary dam main development area sand body thick, the scale is large, the lithology is uniform, the physical property is good, is the high quality reservoir development main zone; The lithology is mainly medium grain lithic sandstone and a small amount of lithic quartz sandstone and quartz sandstone, and box 8 belongs to very low porosity and low permeability reservoir, in which the physical property of box 8 is better than that of box 8. The clay minerals include chlorite, Illite, kaolinite, Illite / interlayer, etc., with Illite as the main layer and no montmorillonite, the diagenesis is strong, and the diagenetic evolution stage reaches the late diagenetic stage B. The main pore types are lithic solution pore, feldspar pore, intergranular dissolved pore and microfracture, etc. Reservoir has strong heterogeneity, reservoir thickness and pore, permeability is controlled by sedimentary facies, and has certain directionality. According to the comprehensive classification criteria of reservoir evaluation, the reservoirs are divided into four types: type 鈪，

本文編號(hào)：2392365