In recent years, the Yanchang shale-oil formations of the Ordos Basin are rich in reserves with complex lithology and structure characteristics, low porosity and low permeability, and weak anomalies for oil and water discriminations, have been the key targets of unconventional oil/gas resource exploration and development in the relevant areas. The joint acoustic-electrical (AE) properties can be used to interpret reservoir lithology, mineralogy, pore structure, and fluid saturation. To conduct tests of thin section analysis, X-ray diffraction, and ultrasonic and electrical experiments at different pressures and saturation degrees, cores from the shale-oil formations in the Q area of the basin are collected. The variations in AE properties with respect to clay content, porosity, pressure (microfracture), and saturation are analyzed. The experimental results indicate that the rock physics behaviors of sandstones with different clay contents vary significantly. The AE properties of clean sandstones are basically dependent on the microfractures (pressure), while for muddy sandstones, the clay content is an important factor affecting the responses. The target reservoir consists of interbedded sandstone and shale layers. The AE equivalent medium equations and the Gurevich theory are applied to establish the joint models for the different lithologies and simulate the variations in AE properties with respect to fluid type, pore structure, and mineral components. The three-dimensional joint templates of clean and muddy sandstones, as well as shale, are developed based on the elastic and electrical attributes and then calibrated using the experimental and well-log data. The reservoir properties are estimated with the templates and validated by the log data. The results indicate that the joint templates based on lithology characteristics can effectively characterize the properties of interbedded sandstone and shale layers. Furthermore, the combined application of AE data provides more beneficial information for the assessment of rock properties, leading to precise estimates that conform with the actual formation conditions.

近年来，鄂尔多斯盆地延长页岩油储量丰富，岩性构造特征复杂，低孔低渗，油水判别异常弱，成为非常规油气开发的重点对象。相关领域的资源勘探开发。联合声电 (AE) 属性可用于解释储层岩性、矿物学、孔隙结构和流体饱和度。采集盆地Q区页岩油层岩心，进行不同压力和饱和度下的薄片分析、X射线衍射、超声波和电学实验等测试。分析了 AE 属性随粘土含量、孔隙度、压力（微裂缝）和饱和度的变化。实验结果表明，不同粘土含量砂岩的岩石物理行为差异很大。清洁砂岩的声发射特性基本上取决于微裂缝（压力），而对于泥质砂岩，粘土含量是影响响应的重要因素。目标储层由砂岩和页岩互层组成。应用声发射等效介质方程和古列维奇理论建立不同岩性的联合模型，模拟声发射特性随流体类型、孔隙结构和矿物成分的变化。清洁和泥质砂岩以及页岩的三维节理模板是根据弹性和电气属性开发的，然后使用实验和测井数据进行校准。储层属性使用模板进行估算，并通过测井数据进行验证。结果表明，基于岩性特征的节理模板能够有效表征砂页岩互层的物性。此外，AE数据的联合应用为岩石性质的评估提供了更多有益的信息，从而导致符合实际地层条件的精确估计。