QUANTITATIVE IDENTIFICATION OF CONFIGURATION INTERFACE FOR OFFSHORE DELTA RESERVOIR AND RESIDUAL OIL PREDICTION
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摘要:
渤海S油田进入高含水期后，层内矛盾日益突出，储层内部结构控制下的剩余油分布规律日趋复杂。针对三角洲相构型界面无法有效识别的难题，以丰富的密闭取心井资料为基础，创新引入“GR回返率”的概念，通过岩心与电测曲线的标定，建立了复合河口坝内不同级次构型界面的定量识别图版，明确了层内构型界面的分布样式，并对其倾角、宽度及延伸范围进行了定量刻画。研究表明，河口坝内具有一定遮挡能力的构型界面主要发育2种样式：即复合坝体内的叠置型水平界面(4级)及单一坝体内的斜交型前积界面(3级)。其中4级界面对剩余油的控制主要表现为垂向遮挡、顶部富集; 3级界面对剩余油的控制主要表现为侧向遮挡、局部富集。针对以上不同的剩余油分布模式，分别提出了采用水平井的方式进行“水上找油”“水下挖油”的调整策略，有效改善了厚层河口坝砂体的层内动用情况，对相似高含水老油田的后期调整具有较强的指导意义。
Abstract:After the S Oilfield in Bohai enters its high water cut period, the intra-layer contradiction becomes more prominent, and the distribution of remaining oil under the control of reservoir internal structure becomes more complicated. Aiming at the problem that the interface of delta facies configuration is not able to be effectively identified, based on the data from sealed coring wells, the concept of GR return rate is introduced by the authors in this paper. Through the calibration of core and electrical logging curves, the quantitative identification chart of interface of different configurations in a composite estuary bar is established, and the distribution pattern of interface of configurations in layer is defined. The dip angle, width and extension range are quantitatively described. The results show that there are two main types of configurational interfaces with certain shielding capacity in estuary bars: superimposed horizontal interface (Grade 4) in the composite bar and oblique front interface (Grade 3) in the single bar. Among them, the control of the remaining oil by the Grade 4 interface is mainly vertical occlusion and top enrichment, while the control of the Grade 3 interface is mainly lateral occlusion and local enrichment. In view of the different remaining oil distribution patterns mentioned above, the adjustment strategies of "oil prospecting on water" and "oil digging under water" by means of horizontal wells are proposed respectively, which can effectively improve the in-formation utilization of thick estuary bar sand bodies, and have a strong guiding significance for the later adjustment of similar high water cut old oilfields.
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