Clastic sedimentary successions are subject to variable amounts of compaction, which causes a decrease in both the thickness and porosity of sand-rich depositional units. Methods for estimating the degree of sediment compaction are needed for characterizing changes in the geometry and petrophysical properties of depositional elements in relation to their burial history. Conventional methods for estimating compaction of rock successions through the application of several empirical equations return estimations whose uncertainties can be significant, and integrative approaches that can produce reliable estimations are therefore desirable. To this end, a new method is proposed here for the estimation of the degree of compaction of sandbodies in ancient channelized fluvial successions. For outcropping fluvial successions, the compacted geometry of channel-fill margins cut into non-cohesive deposits can be measured, whereas the decompacted angle of repose of the material originally forming the channel banks can be estimated experimentally. Sediment compaction can therefore be estimated by comparing the observed geometry of the uppermost part of a channel-fill margin with the angle of repose of the non-cohesive bank material. The proposed method has been applied to three different sand-prone fluvial successions seen in outcrop, for the purposes of (i) illustrating the approach, and (ii) testing it through a comparison of its estimations against results produced by a conventional method based on thin-section observations. The comparison demonstrates that the two methods yield similar results, highlighting how the proposed approach can be readily applied to the assessment of compaction in clastic successions, for scopes of both pure and applied geological research.

中文翻译：

---

一种估算河流层序中砂体压实度的新方法

碎屑沉积层序受到不同程度的压实作用，这会导致富砂沉积单元的厚度和孔隙度降低。需要使用估算沉积物压实程度的方法来表征沉积元素与其埋藏历史相关的几何形状和岩石物理特性的变化。通过应用几个经验方程来估计岩石层序的压实度的常规方法会返回不确定性可能很大的估计值，因此需要能够产生可靠估计值的综合方法。为此，本文提出了一种估算古河道流系中砂体压实程度的新方法。对于露头的河流演替，可以测量切割成非粘性沉积物的通道填充边缘的压实几何形状，而原始形成通道堤的材料的分解休止角可以通过实验估计。因此，可以通过比较观察到的通道填充边缘最上部的几何形状与非粘性堤岸材料的休止角来估计沉积物压实。所提出的方法已应用于露头中看到的三种不同的易出砂河流序列，目的是 (i) 说明该方法，以及 (ii) 通过将其估计值与基于传统方法产生的结果进行比较来测试它薄片观察。比较表明两种方法产生相似的结果，