The acoustic properties of heterozoan and photozoan carbonates are compared and interpreted in the light of their distinct patterns of diagenetic evolution. The combined role of depositional and diagenetic processes on the petroacoustic signatures of both heterozoan and photozoan carbonates has been assessed on the basis of a multi-disciplinary and multi-scale study of Oligo-Miocene limestone outcrops from the Cape Range peninsula (NW Australia). This study integrates a detailed diagenetic analysis (using sedimentology, petrography and stable isotopes geochemistry), as well as physical properties characterization (through acoustic velocity laboratory and porosity measurements, petroacoustic modelling and 3D CT-scan imaging). The three formations studied are characterized by distinct patterns of diagenetic and petroacoustic evolution: heterozoan, non-tropical carbonates from the Mandu and Tulki formations are characterized by significant development of microporosity and pressure-solution compaction features which led to decreasing the pore network stiffness. Photozoan, sub-tropical to tropical carbonates from the Trealla formation are dominated by moldic, vuggy and partially cemented intergranular pores which tends to increase the pore network stiffness. The distinct petroacoustic signatures of heterozoan and photozoan limestones have been shown to be mainly related to (1) differences in compaction during burial resulting from an emersion phase and (2) differences in the mineralogy of dominant carbonate producers.

Temperate High-Mg calcite dominated carbonate typically poorly cemented allowed for greater compaction degree, reducing the ratio of intergranular macropore. Furthermore, these dominant calcite producers (large benthic foraminifers, red algae …) from the heterozoan Mandu and Tulki formations favoured the development of intragranular microporosity whereas less-stable aragonite dominated biota from the photozoan Trealla Limestone favoured the development of molds and vugs, during early meteoric diagenesis. Finally, petroacoustic modelling approaches such as α_K inversion have proved to be efficient for quantifying the impact of diagenetic processes and associated pore types on acoustic properties. These results, emphasizing the strong variability in depositional and diagenetic features for distinct carbonate fabrics could have interesting implications in terms of reservoir properties 3D modelling and upscaling approaches.

根据杂成岩和光成岩的碳酸盐岩的不同成岩作用演化模式，对其声学特性进行了比较和解释。沉积和成岩过程对杂多碳酸盐和光致碳酸盐碳酸盐岩声特征的综合作用已经在来自开普兰奇半岛（澳大利亚西北部）的中新世石灰岩露头的多学科和多尺度研究的基础上进行了评估。这项研究整合了详细的成岩分析（使用沉积学，岩石学和稳定同位素地球化学方法）以及物理特性表征（通过声速实验室和孔隙度测量，岩石声学建模和3D CT扫描成像）。所研究的三种形成的特征是成岩作用和岩声演化的不同模式：杂居动物，来自Mandu和Tulki地层的非热带碳酸盐的特征是微孔性和压力溶液压实特征的显着发展，这导致孔隙网络刚度降低。Trealla地层的亚热带至热带碳酸盐的光子化岩以发霉的，蓬松的和部分胶结的粒间孔隙为主，这往往会增加孔隙网络的刚度。杂岩岩和光子岩石灰岩的独特的岩石声特征已经显示出，主要与（1）由于生发阶段而导致的埋藏期间压实度差异和（2）主要碳酸盐生产商的矿物学差异有关。

温和的高镁方解石为主的碳酸盐通常胶结性较差，可以实现更大的压实度，从而降低了晶间大孔的比率。此外，这些杂类Mandu和Tulki地层中方解石的主要生产者（大型底栖有孔虫，红藻……）有利于颗粒内微孔的形成，而不稳定的文石占优势，而光电子Trealla石灰石在较早的生物中占优势，因此有利于霉菌和孔洞的形成。快速成岩作用。最后，petroacoustic建模方法，如α _ķ反演已被证明可以有效地量化成岩过程和相关孔隙类型对声学性质的影响。这些结果强调了不同碳酸盐织物的沉积和成岩特征的强烈变异性，可能对储层性质的3D建模和放大方法产生有趣的影响。