苏丹Neem油田Abu Gabra组三角洲相储层精细表征

发布时间：2018-01-21 05:37

本文关键词： Neem油田 Abu Gabra组地层对比沉积微相储层特征　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：Neem油田位于苏丹穆格莱德盆地东北部,凯康槽的东部隆起带,面积约为320km2。隆起带主要由两条倾角相反的边界断层控制。本文以地震、岩心、测录井资料为基础,对研究区Abu Gabra组进行储层精细表征研究。论文以“高分辨率层序地层学”和“沉积学”为指导,采用“点—线—面—体”的思路对Neem油田Abu Gabra组进行精细地层划分与对比。识别出一套全区主要标志层AG-4层和两套辅助标志层AG-1、AG-5层;并通过标志层三维追踪闭合进行横向地层对比,把Abu Gabra组共划分为8个砂组、44个小层。利用相干体切片和沿层地震振幅属性提取方法识别出133条断层;其中F150和F009断层将研究区划分为西南断层带、中央构造带、东北断层带三个构造单元。根据分层数据绘制出Abu Gabra组各层的顶面构造等值线,从而识别出构造高点以及圈闭类型——断层圈闭和地层圈闭。沉积相识别标志表明Abu Gabra组主要发育三角洲前缘和前三角洲亚相,可识别出水下分流河道、河口坝、远沙坝、分流间湾、前三角洲泥微相;FMI和地震反演资料综合分析表明Abu Gabra组物源来自工区东北方向;在此基础上,明确了各层沉积微相平面特征,并最终建立Abu Gabra组沉积相模式——鸟足状三角洲沉积。Abu Gabra组储层岩石类型主要为粉砂岩、粗砂岩、砂砾岩;岩心和测井综合解释表明Abu Gabra组储层物性整体具有中高孔中高渗特点;前三角洲泥岩隔层的发育,Abu Gabra组在垂向上被分为7个独立油藏。次级断层、层内分流间湾夹层的发育使层内渗流方向发生了改变,致使研究区Abu Gabra组储层非均质性明显。综合以上分析,推断出工区AG-3、AG-4、AG-5和AG-6层水下分流河道属于有利储层区。
[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.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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