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东委内瑞拉盆地中的Budare油田尽管已进入成熟期,但其地层和构造的复杂性蕴藏着可观的油气储量增长潜力。在1995年对油田的大片区域作3D地震数据采集之后,我们对这种复杂性的分辨能力得到了大大增强。通过合成记录,地震资料与数口井的测井资料(包含声测井和密度测井数据)相连,然后,再与由测井资料对比建立的高分辨率的成因地层框架综合。在地震资料上识别出的两个标志面直接与由地层确定的两个层序界面(最大洪泛面MFS,80和100)相匹配。第三个地震界面大约与根据地层确定的MFS62相对应。这些面合起来构成基本的控制面,据此开展了地震属性和反演模型图像的进一步分析。由地震图像和属性分析检测出的四个沉积取向带,对于油气储量增长潜力具有重要的指向意义,指引着油田的未来开发。通过对标志层MFS62和80之间平均地震振幅成图,发现一个主要由河流相砂岩厚层充填的深切河谷,在砂岩与构造高点相交位置确定了几口甩开井(step-out)井位。以类似的方法,通过对标志层MFS 80以下35ms时窗内平均地震振幅作图,找出了支流河口沙坝厚层沉积相的分布位置及其与相邻薄层河漫滩相(strandplain facies)之间的界线。河口沙坝相与由构造确定的一个潜在大块油田拓展区的高点位置吻合,提供了多口潜在加密井井位。在标志层MFS 6
The Budare field in the eastern Venezuela basin, despite its mature stage, has considerable reservoir and reservoir potential for potential reservoir and structural complexity. After 3D seismic data was collected from a large area of the oilfield in 1995, our resolution of this complexity has been greatly enhanced. Seismic data are then combined with logging data from several wells, including acoustic and density logs, and then combined with the high-resolution genetic stratigraphic framework established by logging data. The two identified facets identified on the seismic data directly match the two sequence boundaries defined by the formation (maximum flooding surface MFS, 80 and 100). The third seismic interface corresponds approximately to MFS62 as determined by the formation. Together, these planes form the basic control surface, from which further analysis of the seismic attributes and the inversion model images is carried out. The four sedimentary orientation bands detected by seismic image and attribute analysis are of great significance to the potential of oil and gas reserves growth and guide the future development of the oilfield. By mapping the average seismic amplitudes between the marker layers MFS62 and M80, a deep river valley mainly filled with thick sands of fluvial facies was found, and several step-out wells were identified at the intersection of sandstone and structural highs Bit. In a similar way, the distribution of the thick sedimentary facies of the tributary estuarine sand bar and its relationship with the adjacent laminar facies facies are found by plotting the average within-window amplitude of the window 35 m below the MFS 80 marker Between the boundaries. The estuarine sands facies coincide with the high point of a potential large oilfield extension identified by tectonics, providing multiple potential wells for wellbore conditions. At the sign layer MFS 6