本文選題：鄂爾多斯盆地 + 長61油層亞組　； 參考：《西安石油大學(xué)》2015年碩士論文

【摘要】：吳起油田王洼子區(qū)塊位于陜西省吳起縣西部,構(gòu)造位置處于鄂爾多斯盆地的伊陜斜坡西部邊緣,長6油層組是本區(qū)主力產(chǎn)油層。根據(jù)巖性、電性特征,進(jìn)一步將長6油層組劃分為長61、長62、長63、長64個油層亞組,在地層對比的基礎(chǔ)上,建立了全區(qū)統(tǒng)一的地層格架。王洼子區(qū)塊長6油層總體構(gòu)造格架為一平緩的西傾單斜,在西傾單斜上發(fā)育較小幅度的鼻狀構(gòu)造。根據(jù)本區(qū)區(qū)域沉積背景、砂體平面分布形態(tài)、巖石類型、測井曲線等分析確定,研究區(qū)長6油層組屬于三角洲前緣亞相,進(jìn)一步劃為水下分流河道、水下分流間灣、河口壩以及前緣席狀砂4類沉積微相。通過砂地比等值線圖、砂體分布圖等進(jìn)一步分析了長6油層組中長61、長62、長63以及長64油層亞組的沉積微相類型及展布特征。長61為主力油層,對長61儲層進(jìn)行詳細(xì)分析評價。巖心觀察、室內(nèi)巖石薄片鏡下鑒定、分析測定等表明研究區(qū)長61油層組儲層砂巖主要是淺灰色細(xì)粒長石砂巖和巖屑質(zhì)長石砂巖,孔隙類型以粒間孔隙為主,儲層砂巖己達(dá)中成巖A階段的中晚期-中成巖B階段的早期。長61油層組儲層物性較差,主要為一套特低孔-超低滲儲層。長61油層組儲層的層內(nèi)非均質(zhì)性較強(qiáng)。綜合研究分析,根據(jù)儲層分類標(biāo)準(zhǔn),長61儲層為Ⅳa或Ⅳb類儲層。
[Abstract]:The Wangwa sub-block of Wuqi Oilfield is located in the western part of Wuqi County, Shaanxi Province. The structural position is located on the western edge of the Yishan slope in the Ordos Basin. The Chang 6 oil formation is the main oil producing layer in this area. According to the lithology and electrical characteristics, Chang 6 oil formation is further divided into Chang 61, Chang 62, Chang 63 and Chang 64 reservoirs. On the basis of stratigraphic correlation, a unified stratigraphic framework is established. The overall tectonic framework of Chang 6 reservoir in Wangwazi block is a gentle westward tilting monocline with a relatively small rhinoid structure developed on the westward tilting monocline. According to the regional sedimentary background, sand body plane distribution, rock type, logging curve, etc., the Chang 6 oil formation in the study area belongs to delta front subfacies, which is further divided into underwater distributary channel and underwater distributary bay. Estuarine dams and front matting sand four types of sedimentary microfacies. The sedimentary microfacies types and distribution characteristics of Chang-6 oil formation subformations Chang61, Chang62, Chang63 and Chang64 are further analyzed by means of the sand-land ratio isoline map and sand body distribution map. Chang61 is the main reservoir, the Chang61 reservoir is analyzed and evaluated in detail. Core observation, microscopic identification, analysis and measurement of reservoir sandstone of Chang61 formation in the study area show that the reservoir sandstones are mainly light gray fine-grained feldspathic sandstone and lithic feldspathic sandstone, and the pore types are mainly intergranular pores. Reservoir sandstone has reached the middle-late-middle diagenetic stage B of the middle diagenesis A stage. The reservoir physical properties of Chang61 reservoir group are poor, mainly a set of ultra-low porosity and ultra-low permeability reservoirs. Reservoir heterogeneity of Chang 61 reservoir is strong. According to the criteria of reservoir classification, Chang 61 reservoir is classified as 鈪，

本文編號：1984873