【摘要】 文中借助多尺度CT扫描，综合分析了东濮凹陷薄互层页岩岩相及组合的储层微观特征，表征了主要岩相储层物性，通过微观特征研究与岩相对比，明确了不同岩相及组合的微观特征差异。研究表明：1）东濮凹陷沙三中、下主要岩相为黏土质灰质混积岩、含灰长英质页岩、含长英黏土质灰岩及灰云岩，其中黏土质灰质混积岩相物性最佳，灰云岩相优于含长英黏土质灰岩相和含灰长英质页岩相。2）薄互层页岩优质储层中动态烃主要赋存于泥质纹层，微裂缝可助其在不同纹层间沟通，黏土质灰质混积岩相与灰云岩相叠置形成的互层型和夹层型储层为页岩油重点勘察对象。3）地层埋深增加会加大薄互层页岩油成储难度，长期压实与胶结作用会降低岩石孔隙度和渗透率。更多还原

【Abstract】 Based on multi-scale CT scanning, this study comprehensively analyzes the lithofacies and the composite reservoir microcharacteristics of thin-interbedded shale in Dongpu Sag, characterized the reservoir physical properties of major lithofacies. Through micro-characteristics analysis and lithofacies comparison, the differences in micro-characteristics among various lithofacies and their combinations are clarified. The results indicate that:(1) The dominant lithofacies in the middle and lower of Sha 3 Formation(Es3)include clay-calcareous mixed rocks, calcareous-bearing felsic-argillaceous shale, felsic-bearing argillaceous limestone and dolomitic limestone. Among them, clay-calcareous mixed rocks exhibit the optimal physical properties, followed by dolomitic limestone which outperforms felsic-bearing argillaceous limestone and calcareous-bearing felsic-argillaceous shale.(2) In high-quality thininterbedded shale reservoirs, dynamic hydrocarbons predominantly occur within argillaceous laminae, while microfractures facilitate dynamic hydrocarbon connectivity across different laminae. Interbedded and intercalated assemblages formed by the stacking of clay-calcareous mixed rocks and dolomitic limestone are key exploration targets for shale oil.(3) The increase of formation burial depth elevates the difficulty of shale oil accumulation in thininterbedded reservoirs, as long-term compaction and cementation reduce porosity and permeability of rocks.更多还原