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首页> 外文会议>SPE 7th Latin American and Caribbean petroleum engineering conference >Bimodal Behavior of Mercury-Injection Capillary Pressure Curve and Its Relationship to Pore Geometry, Rock-Quality and Production Performance in a Laminated and Heterogeneous Reservoir
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Bimodal Behavior of Mercury-Injection Capillary Pressure Curve and Its Relationship to Pore Geometry, Rock-Quality and Production Performance in a Laminated and Heterogeneous Reservoir

机译：层状非均质油藏中注汞毛细压力曲线的双峰行为及其与孔隙几何形状，岩石质量和生产性能的关系

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The determination of pore geometry and pore aperture sizernfrom mercury injection tests is a very helpful technique. Duernto the amount of pressure data points that can be taken, arndetailed characterization of the capillarity of the rocks can bernaccomplished. The size and geometry of the pores are relatedrnto variability in grain size, sorting and packing, as well as tornfactors such as the mineralogy and the diagenetic history ofrnthe formation.rnThis paper presents the results of the integration ofrncapillary pressure curves, conventional core analysis andrnpetrographical Investigation, in a highly heterogeneous porerngeometry, where a bimodal behavior of mercury-injectionrncapillary pressure curves was identified, showing two mainrntypes of pore throat, one with a larger flow capacity than thernother. This analysis was backed up by thin sections made inrnadjacent samples, where strong changes in sorting, grain sizernand increment in the percentage of clay matrix can be seen.rnThe changes in pore geometry observed within such smallrndistances, demonstrate the high heterogeneity of the reservoirrnrock.rnAn attempt was made to classify the different rock typesrnpresent in the reservoir, using the Winland (R35) relationshiprnto calculate pore throat radius based on permeability andrnporosity. Despite the complexity of the pore system, it wasrnfound that R35 can appropriately represent the largest portionrnof the rock volume with the main pore throat radius thatrncontributes to the flow.rnThe fact that the mercury capillary pressure curvesrngrouped by rock type always show the bimodal shape, wasrntaken into account in order to understand the wells productionrnin the reservoir, because the performance of the wells willrndepend on the volume of each main pore throat radius in therncompleted zones.
机译：通过注汞试验确定孔的几何形状和孔径大小是一项非常有用的技术。 Duernto可以获取压力数据点的数量，可以完成岩石毛细作用的详细表征。孔隙的大小和几何形状与晶粒大小，分类和堆积的变化以及矿物学和成岩史等破裂因素有关。本文介绍了毛细管压力曲线积分，常规岩心分析和岩相学研究的结果。 ，在高度异质的孔几何学中，其中确定了汞注入毛细血管压力曲线的双峰行为，显示出两种主要的孔喉类型，一种具有比另一种更大的流量。这项分析得到了不相邻样品制成的薄切片的支持，其中可以看到分选，粒度和粘土基质百分比增加的强烈变化.rn在如此小的距离内观察到的孔隙几何结构变化表明储层岩石具有很高的非均质性。尝试使用Winland（R35）关系对储层中存在的不同岩石类型进行分类，以基于渗透率和孔隙度计算孔喉半径。尽管孔隙系统很复杂，但发现R35可以恰当地代表岩石体积的最大部分，而主要孔隙喉部半径对流动有贡献。事实是，按岩石类型分组的汞毛细管压力曲线总是呈双峰形，被浪费了为了理解油藏中的油井产量，需要考虑这些因素，因为油井的性能将取决于完井区每个主孔喉半径的大小。

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