本文關(guān)鍵詞： Neem油田 Abu Gabra組 地層對比 沉積微相 儲層特征　出處：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：Neem油田位于蘇丹穆格萊德盆地東北部,凱康槽的東部隆起帶,面積約為320km2。隆起帶主要由兩條傾角相反的邊界斷層控制。本文以地震、巖心、測錄井資料為基礎(chǔ),對研究區(qū)Abu Gabra組進(jìn)行儲層精細(xì)表征研究。論文以“高分辨率層序地層學(xué)”和“沉積學(xué)”為指導(dǎo),采用“點(diǎn)—線—面—體”的思路對Neem油田Abu Gabra組進(jìn)行精細(xì)地層劃分與對比。識別出一套全區(qū)主要標(biāo)志層AG-4層和兩套輔助標(biāo)志層AG-1、AG-5層;并通過標(biāo)志層三維追蹤閉合進(jìn)行橫向地層對比,把Abu Gabra組共劃分為8個砂組、44個小層。利用相干體切片和沿層地震振幅屬性提取方法識別出133條斷層;其中F150和F009斷層將研究區(qū)劃分為西南斷層帶、中央構(gòu)造帶、東北斷層帶三個構(gòu)造單元。根據(jù)分層數(shù)據(jù)繪制出Abu Gabra組各層的頂面構(gòu)造等值線,從而識別出構(gòu)造高點(diǎn)以及圈閉類型——斷層圈閉和地層圈閉。沉積相識別標(biāo)志表明Abu Gabra組主要發(fā)育三角洲前緣和前三角洲亞相,可識別出水下分流河道、河口壩、遠(yuǎn)沙壩、分流間灣、前三角洲泥微相;FMI和地震反演資料綜合分析表明Abu Gabra組物源來自工區(qū)東北方向;在此基礎(chǔ)上,明確了各層沉積微相平面特征,并最終建立Abu Gabra組沉積相模式——鳥足狀三角洲沉積。Abu Gabra組儲層巖石類型主要為粉砂巖、粗砂巖、砂礫巖;巖心和測井綜合解釋表明Abu Gabra組儲層物性整體具有中高孔中高滲特點(diǎn);前三角洲泥巖隔層的發(fā)育,Abu Gabra組在垂向上被分為7個獨(dú)立油藏。次級斷層、層內(nèi)分流間灣夾層的發(fā)育使層內(nèi)滲流方向發(fā)生了改變,致使研究區(qū)Abu Gabra組儲層非均質(zhì)性明顯。綜合以上分析,推斷出工區(qū)AG-3、AG-4、AG-5和AG-6層水下分流河道屬于有利儲層區(qū)。
[Abstract]:Neem oil field is located in the eastern uplift zone of Kekang trough in the northeast of Muglad basin, Sudan, with an area of about 320km2. The uplift zone is mainly controlled by two boundary faults with opposite dip angles. On the basis of logging data, the fine reservoir characterization of Abu Gabra formation in the study area is studied. The paper is guided by "high-resolution sequence stratigraphy" and "sedimentology". Application of "Point-line-surface-body" to Abu in Neem Oilfield. The Gabra formation is divided into fine strata and correlated. A set of AG-4 layer and two sets of auxiliary marker layer AG-1 are identified. AG-5 layer; The Abu Gabra formation is divided into 8 sand formations through horizontal stratigraphic correlation through 3D tracing closure of the marker layer. 133 faults were identified by means of coherent volume slice and seismic amplitude attribute extraction along the formation. Among them, F150 and F009 faults can be divided into southwest fault zone and central tectonic zone. According to the stratified data, the top structure isolines of each layer of Abu Gabra formation are drawn. Therefore, the structural high points and trap types, fault traps and stratigraphic traps are identified. The sedimentary facies identification marks indicate that delta front and prodelta subfacies are mainly developed in Abu Gabra formation. Underwater distributary channel, estuarine dam, far sand dam, interdistributary bay, pre-delta mud microfacies can be identified. The comprehensive analysis of FMI and seismic inversion data shows that the source of Abu Gabra formation comes from the northeast direction of the work area. On this basis, the plane characteristics of sedimentary microfacies in each layer are clarified. Finally, the sedimentary facies model of Abu Gabra formation-bird foot delta sedimentary. Abu Gabra formation reservoir rock types are mainly siltstone, coarse sandstone, sandy gravel; The comprehensive interpretation of core and logging shows that the reservoir physical properties of Abu Gabra formation have the characteristics of medium, high porosity and high permeability. The Gabra formation is divided into seven independent reservoirs in vertical direction. The direction of percolation is changed due to secondary faults and interdistributary bay intercalation. As a result, the reservoir heterogeneity of Abu Gabra formation is obvious in the study area. Based on the above analysis, it is inferred that the underwater distributary channel of AG-3, AG-4, AG-5 and AG-6 layer belongs to favorable reservoir area.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P618.13

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