Integrated Reservoir Characterization and Multiscale Heterogeneity Modeling of Stacked Meander-belt Deposits, Lower Cretaceous McMurray Formation, Alberta

S. Nejadi, J. Curkan, P. Durkin, S. Hubbard, I. Gates
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引用次数: 1

Abstract

Summary The McMurray Formation is composed of large-scale fluvial meander-belt deposits that are highly heterogeneous. Repeated cut and fill events within the formation have led to a complex amalgam of stacked stratigraphic architectural elements. Lithological properties vary both laterally and vertically over short distances in the McMurray Formation. The youngest deposits of the reservoir studied at the Surmont site are well imaged using 3D seismic data; calibration with well-data enables construction of a particularly detailed reservoir model. The underlying deposits are characterized using wire line logs, core data, and stratigraphic dip analysis. For modeling purposes, internal stratigraphic architecture of both reservoir levels is mapped and distinct fluvial meander-belt architectural elements, including point bars, counter point bars, side bars and abandoned channel fills, are characterized as distinct zones. Each zone is characterized by distinct morphology, facies associations, petrophysical properties, and thus, reservoir potential. Deterministic geobody interpretations are implemented to guide geostatistical simulations; spatial distribution of facies are constrained to the mapped architectural elements. Constraining parameter estimations to deterministically interpret meander-belt architectural elements improves the predictive capability of the reservoir model. This modeling workflow preserves geological realism in models, allows spatial uncertainty to be captured adequately, and improves the ability to optimize development.
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艾伯塔省下白垩统McMurray组叠合曲流带储层综合表征及多尺度非均质性建模
McMurray组由大型河流曲流带组成,具有高度的非均质性。地层中反复的切割和填充事件导致了堆叠地层建筑元素的复杂混合体。在McMurray地层中,岩性在横向和纵向上都发生了变化。利用三维地震数据对苏蒙地区最年轻的储层进行了很好的成像;利用井数据进行校准,可以构建特别详细的油藏模型。利用钢丝绳测井、岩心资料和地层倾角分析对下伏矿床进行了表征。为了建模的目的,绘制了两个水库层的内部地层结构,并将不同的河流曲流带建筑元素,包括点坝、反点坝、边坝和废弃的河道填塞物,表征为不同的区域。每个带都具有不同的形态、相组合、岩石物理性质,从而具有储集潜力。实施确定性地质体解释,指导地质统计模拟;相的空间分布受限于映射的建筑元素。约束参数估计对曲流带构造要素进行确定性解释,提高了储层模型的预测能力。该建模工作流程保留了模型中的地质真实性,允许充分捕获空间不确定性,并提高了优化开发的能力。
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