Molecular dynamics modeling of the effects of cementation on the acoustical properties of granular sedimentary rocks

TL;DR

This study uses molecular dynamics simulations to explore how cementation affects the acoustical properties of granular sedimentary rocks, considering microstructure, cement amount, and elastic properties.

Contribution

It introduces a detailed simulation approach that accounts for microstructural cement placement and compares results with experimental and theoretical data.

Findings

Acoustical properties depend on cement amount and stiffness.

Simulation results align well with experimental data.

Sound velocity varies with cement saturation and porosity.

Abstract

The incidence of cementation processes on the acoustical properties of sands is studied via molecular dynamics simulation techniques. In our simulations, we consider samples with different degrees of compaction and cementing materials with distinct elastic properties. The microstructure of cemented sands is taken into account while adding cement at specific locations within the pores, such as grain-to-grain contacts. Results show that acoustical properties of cemented sands are strongly dependent on the amount of cement, its relative stiffness with respect to the hosting medium, and its location within pores. Simulation results are in good correspondence available experimental data and compare favourably with some theoretical predictions for the sound velocity within a range of cement saturation, porosity and confining pressure.