Abstract Stylolites are rough surfaces that form by pressure solution, and present variable geometries and spatial distributions. Despite being ubiquitous in carbonate rocks and potentially influencing fluid flow, it is not yet clear how the type and distribution of stylolite networks relate to lithofacies. This study investigates Lower Cretaceous platform carbonates in the Benicassim area (Maestrat Basin, Spain) to statistically characterise stylolite morphology and stylolite network distributions in a selection of typical shallow-marine carbonate lithofacies, from mudstones to grainstones. Bedding-parallel stylolite networks were sampled in the field to quantify stylolite spacing, wavelength, amplitude, intersection morphology and connectivity. Grain size, sorting and composition were found to be the key lithological variables responsible for the development of rough anastomosing stylolite networks. Poorly-connected stylolites with large vertical spacings were found to be dominant in grain-supported lithofacies, where grains are fine and well sorted. Anastomosing stylolite networks appear well developed in mud-supported lithofacies with poorly-sorted clasts that are both heterogenous in size and composition. Mud-supported facies feature stylolites that are closely spaced, have high amplitudes and intersection densities, and predominantly present suture and sharp-peak type morphologies. Larger grains and poor sorting favour the formation of stylolites with small vertical spacings, low wavelengths and high amplitudes. This statistical analysis approach requires only limited information, such as that from drill core, and can be used to characterise stylolite morphology and distributions in subsurface carbonate reservoirs.

中文翻译：

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不同台地碳酸盐岩相缝合线网络定量分析

摘要 缝合线是由压力溶解形成的粗糙表面，具有可变的几何形状和空间分布。尽管在碳酸盐岩中无处不在并可能影响流体流动，但目前尚不清楚缝合线网络的类型和分布与岩相之间的关系。本研究调查了 Benicassim 地区（西班牙马埃斯特拉特盆地）的下白垩统台地碳酸盐岩，以统计表征从泥岩到颗粒岩的一系列典型浅海碳酸盐岩相中的缝合线形态和缝合线网络分布。在现场对层理平行的缝合线网络进行采样，以量化缝合线间距、波长、振幅、交叉形态和连通性。晶粒尺寸，发现分选和成分是导致粗糙吻合缝合线网络发展的关键岩性变量。发现垂直间距大的连接不良的缝合线在颗粒支持的岩相中占主导地位，其中颗粒细小且分选良好。在泥质支持的岩相中，吻合的缝合线网似乎发育良好，碎屑分选不良，大小和成分均不均匀。泥质支撑相的特点是缝合线相距很近，具有高振幅和交叉密度，主要呈现缝合线和尖峰型形态。较大的晶粒和较差的分选有利于形成具有小垂直间距、低波长和高振幅的缝合线。这种统计分析方法只需要有限的信息，