Abstract Drilled cores, thin section petrography, X-ray diffraction (XRD), scanning electron microscopy (SEM), routine core analysis (RCA), and mercury injection capillary pressure (MICP) tests were used to establish a predictable model for diagenetic facies and reservoir quality using well logs in sandstones of the Paleogene Dongying Formation in Nanpu Sag, Bohai Bay Basin, Eastern China. The results show that the sandstones are texturally and compositionally immature, and have primary intergranular pores, secondary intergranular and intragranular pores, moldic pores, and micro-pores associated with diagenetic clay minerals. The sandstones have undergone low to moderate mechanical compaction, but a high degree of framework-grain dissolution. Diagenetic minerals are dominantly of carbonates (calcite, dolomite, and Fe-dolomite) and clay minerals (illite, mixed layer illite/smectite and kaolinite). Four types of diagentic facies are recognized: tightly compacted, carbonate cemented, clay mineral filling, and dissolution facies. Porosity, permeability and oil saturation ranges among these diagenetic facies were determined from routine core analyses. The diagenetic facies were then translated to conventional well logs by core-log calibration, and the well log expressions (in terms of natural gamma ray, neutron porosity, bulk density, sonic transit time, and resistivity logs) of various diagenetic facies were summarized. The mineralogical composition obtained from the Elemental Capture Spectroscopy (ECS) logs was then used for the diagenetic facies prediction. The diagenetic facies predicted with the comprehensive conventional log analyses were combined with the ECS log profile, and were calibrated with the XRD, SEM analysis and logging interpretation results. For wells without ECS log, the diagenetic facies can be quantitatively predicted by the mathematical calculations of reservoir quality index (RQI) via the GR, AC and DEN log curves. Reservoir quality or oil bearing properties can be evaluated and predicted by translating the diagenetic facies to well logs.

中文翻译：

---

通过测井对成岩相进行定性和定量预测

摘要 钻孔岩心、薄片岩相学、X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、常规岩心分析 (RCA) 和注汞毛细管压力 (MICP) 测试被用来建立可预测的成岩相和岩心模型。渤海湾盆地南堡凹陷古近系东营组砂岩测井储层质量. 结果表明，砂岩结构和成分不成熟，具有原生粒间孔、次生粒间和粒内孔、铸模孔和与成岩粘土矿物伴生的微孔。砂岩经历了低至中度的机械压实，但高度的格架-颗粒溶解。成岩矿物主要是碳酸盐（方解石、白云石、和铁白云石）和粘土矿物（伊利石、混合层伊利石/蒙脱石和高岭石）。识别出四种类型的成因相：紧密压实相、碳酸盐胶结相、粘土矿物充填相和溶蚀相。这些成岩相的孔隙度、渗透率和含油饱和度范围是通过常规岩心分析确定的。然后通过岩心测井校准将成岩相转化为常规测井，并总结了各种成岩相的测井表达式（根据天然伽马射线、中子孔隙度、体积密度、声波传播时间和电阻率测井）。然后将从元素捕获光谱 (ECS) 测井中获得的矿物组成用于成岩相预测。综合常规测井分析预测的成岩相与ECS测井剖面相结合，并用XRD、SEM分析和测井解释结果进行校准。对于没有ECS测井的井，可以通过GR、AC和DEN测井曲线通过储层质量指数(RQI)的数学计算来定量预测成岩相。可以通过将成岩相转换为测井来评估和预测储层质量或含油特性。