A comprehensive petrophysical study of the Upper Qishn Clastic Member reservoir was conducted at Tawila oilfield in Yemen. An integrated well-logging dataset was analyzed to detect the reservoir properties and hydrocarbon potential. Lithologic data, shale/matrix models, elastic, seismo-facies, and fluid analytical analyses and crossplots were generated to characterize the reservoir. The clastic reservoir was subdivided into four petrophysical zones (S1A, S1B, S2, and S3) having different reservoir properties and hydrocarbon content. Crossplots of dia-porosity, apparent-matrix density, and elastic rock properties revealed a reservoir with mixed rock types primarily composed of quartz, calcite, and feldspars, with rare kaolinite and heavy minerals. A laminated-shale model was found to apply to the S2 and S3 reservoir zones, while dispersed- and structural-shale models best describe the S1A and S1B zones. Pickett and Buckles saturation crossplots indicated that the reservoir is not at irreducible water saturation. The Qishn reservoir exhibits regular and uniform facies of similar thickness throughout the study area with a slight dip toward the northwestern part of the oilfield. Estimated petrophysical parameters for the reservoir are represented by vertical petrophysical analogs and property distribution maps. The vertical petrophysical analogs show that the S2 and S3 zones attained clearly defined reservoir properties compared to S1A and S1B zones. The S2 zone has an effective porosity of 11–19%, permeability of 2–670 mD, and hydrocarbon saturation < 57%. The S3 zone offers an effective porosity of 12–21%, permeability of 4–2000 mD, and hydrocarbon saturation < 61%. Both S1A and S1B zones show weak petrophysical parameters and low hydrocarbon content. Hydrocarbon-distribution maps reveal significant hydrocarbon saturation north of the main east–west-trending fault reaching a maximum associated with low shale volume and excellent effective porosity and permeability values. It was concluded that the S2 and S3 zones are the most hydrocarbon-rich zones in the reservoir and should be further studied and mapped across the study area and the nearby oilfields.

在也门塔维拉油田进行了上Qishn碎屑岩储层的综合岩石物理研究。分析了综合测井数据集以检测储层性质和烃潜力。生成岩性数据，页岩/基质模型，弹性，地震相，流体分析和交会图以表征储层。碎屑岩储层又分为四个岩石物理区（S1A，S1B，S2和S3），它们具有不同的储层性质和烃含量。透孔性，表观基质密度和弹性岩石性质的交会图显示，储集层具有主要由石英，方解石和长石组成的混合岩石类型，以及稀有的高岭石和重矿物。发现了一个层状页岩模型适用于S2和S3油藏区，而分散页岩和结构页岩模型最能描述S1A和S1B带。Pickett和Buckles饱和度交会图表明该储层未处于不可还原的水饱和度。Qishn油藏在整个研究区域内表现出规则且均匀的相，厚度相近，向油田西北部略有倾斜。储层的估计岩石物理参数由垂直岩石物理类似物和属性分布图表示。垂直的岩石物理模拟显示，与S1A和S1B带相比，S2和S3带获得了明确定义的储层性质。S2带的有效孔隙度为11–19％，渗透率为2–670 mD，且烃饱和度 Pickett和Buckles饱和度交会图表明该储层未处于不可还原的水饱和度。Qishn油藏在整个研究区域内表现出规则且均匀的相，厚度相近，向油田西北部略有倾斜。储层的估计岩石物理参数由垂直岩石物理类似物和属性分布图表示。垂直的岩石物理模拟显示，与S1A和S1B带相比，S2和S3带获得了明确定义的储层性质。S2带的有效孔隙度为11–19％，渗透率为2–670 mD，且烃饱和度 Pickett和Buckles饱和度交会图表明该储层未处于不可还原的水饱和度。Qishn油藏在整个研究区域内表现出规则且均匀的相，厚度相近，向油田西北部略有倾斜。储层的估计岩石物理参数由垂直岩石物理类似物和属性分布图表示。垂直的岩石物理模拟显示，与S1A和S1B带相比，S2和S3带获得了明确定义的储层性质。S2带的有效孔隙度为11–19％，渗透率为2–670 mD，且烃饱和度 Qishn油藏在整个研究区域内表现出规则且均匀的相，厚度相近，向油田西北部略有倾斜。储层的估计岩石物理参数由垂直岩石物理类似物和属性分布图表示。垂直的岩石物理模拟显示，与S1A和S1B带相比，S2和S3带获得了明确定义的储层性质。S2带的有效孔隙度为11–19％，渗透率为2–670 mD，且烃饱和度 Qishn油藏在整个研究区域内表现出规则且均匀的相，厚度相近，向油田西北部略有倾斜。储层的估计岩石物理参数由垂直岩石物理类似物和属性分布图表示。垂直的岩石物理模拟显示，与S1A和S1B带相比，S2和S3带获得了明确定义的储层性质。S2带的有效孔隙度为11–19％，渗透率为2–670 mD，且烃饱和度< 57％。S3带的有效孔隙度为12–21％，渗透率为4–2000 mD，烃饱和度< 61％。S1A和S1B带均显示出较弱的岩石物理参数和低烃含量。碳氢化合物分布图显示，东西走向主断层以北的油气饱和度很高，达到了与低页岩量和出色的有效孔隙度和渗透率值相关的最大值。结论是，S2和S3带是储层中碳氢化合物含量最高的区域，应进一步研究并将其绘制在研究区域和附近的油田中。