Geometry and compartmentalization of fluvial meander-belt reservoirs at the bar-form scale: quantitative insight from outcrop, modern and subsurface analogues
Geometry and compartmentalization of fluvial meander-belt reservoirs at the bar-form scale: quantitative insight from outcrop, modern and subsurface analogues
复制标题
DOI：
10.1016/j.marpetgeo.2017.01.024
复制
发表时间：
2017-04
影响因子：
4.2
通讯作者：
L. Colombera;N. Mountney;C. Russell;M. N. Shiers;W. McCaffrey
中科院分区：
文献类型：
--
作者：
L. Colombera;N. Mountney;C. Russell;M. N. Shiers;W. McCaffrey
河流曲流带保存的沉积物通常采取以成因相关的泥质河道充填物为边界的砂质倾向的条形元素的拼凑形式。在作为油气储层的曲流带中，沉积结构的特征，包括点坝单元的几何形状和易泥化废弃河道充填物的存在所产生的内部分隔，控制着初次和强化油气开采的有效性。因此，定量描述曲流带的结构是必要的，以提供约束条件，地下predictions.To为此，沉积数据集的检查，使数据库辅助分析，进行。64个现代，古代露头和地下河流沉积体系的数据库案例研究的特点是在定量的方式，以评估不同风格的岩性划分的相对重要性，并提供限制，可以应用到通知曲流带储层中的酒吧规模的砂体的几何形状和连通性的预测。本研究的结果包括：（i）一组经验关系，这些经验关系将描述点沙坝单元、相关河道充填物、河道复合体和潜在未波及隔室的几何形状的尺寸参数联系起来;（ii）将井密度与井阵列包围的隔室的比例相关联的概率描述，和未开发的条形隔室的最大体积。由此产生的预测工具可以直接或通过并入储层模型来应用于辅助储层开发和生产。例如，示出了如何使用这些定量约束来预测具有潜在绕过烃的点坝储层隔室的可能体积，以及优化钻井策略（例如，是否以及如何执行填充钻井或水平钻井），通过提供绕过的烃体积的可能存在、尺寸、间距和取向的测量。
The preserved deposits of fluvial meander belts typically take the form of patchworks of sand-prone bar-form elements bordered by genetically related, muddy channel fills. In meander belts that act as hydrocarbon reservoirs, characteristics of sedimentary architecture, including the geometry of point-bar elements and the internal compartmentalization exerted by the presence of mud-prone abandoned channel fills, control the effectiveness of primary and enhanced hydrocarbon recovery. Therefore, a quantitative description of meander-belt architectures is desired to provide constraints to subsurface predictions.To this end, an examination of sedimentological datasets, enabled by database-assisted analysis, is undertaken. Sixty-four database case studies of modern, ancient outcropping and subsurface fluvial depositional systems are characterized in a quantitative manner, to assess the relative importance of different styles of lithological compartmentalization, and to provide constraints that can be applied to inform predictions of the geometry and connectivity of bar-scale sandbodies in meander-belt reservoirs. The results of this study include: (i) a set of empirical relationships that relate dimensional parameters describing the geometry of point-bar elements, associated channel fills, channel complexes and potentially unswept compartments; (ii) probabilistic descriptions that relate well density to both the proportion of compartments intersected by a well array, and the maximum volume of untapped bar-form compartments.The resulting predictive tools can be applied to assist reservoir development and production, either directly or through incorporation into reservoir models. For example, it is shown how to use these quantitative constraints to predict the likely volume of point-bar reservoir compartments with potential bypassed hydrocarbons, and to optimize drilling strategies (e.g., whether and how to perform infill drilling or horizontal drilling), by providing a measure of the likely presence, size, spacing, and orientation of bypassed hydrocarbon volumes.