江汉盆地潜江凹陷潜三段盐韵律层页岩油富集机理

针对潜江组页岩油富集机理方面的研究较为欠缺.利用岩心图像、岩石热解、镜质体反射率、生物标志化合物、干酪根显微组分鉴定、岩石物性、测井及XPT压力试井等资料对韵律层的烃源岩品质、储集性能以及保存条件进行了综合分析.从王场背斜过渡至蚌湖向斜南斜坡，韵律层干酪根类型均以Ⅰ-Ⅱ₁型为主，镜质体反射率介于0.51%~0.80%.王场背斜韵律层内岩石与底部盐岩内的夹层白云质泥岩间的C₂₉甾烷成熟度指标存在明显差异，指示存在运移油.储集岩孔隙度介于7.8%~26.3%.韵律层顶底盐岩厚度大（> 6 m）且横向分布稳定，沉积-埋藏期并未发生严重破裂.在保存条件及储集能力优越的基础上，同层深部运移供烃是构造高部位韵律层中页岩油富集的重要因素，而原地生烃滞留则控制着构造低部位页岩油的富集. 

Mechanism of Shale Oil Enrichment from the Salt Cyclotherm in Qian3 Member of Qianjiang Sag,Jianghan Basin

Research on the shale oil enrichment mechanism of Qianjiang Formation is lacking.The data of core image, rock pyrolysis, vitrinite reflectance, biomarkers, maceral composition, rock petrophysics, well logging, and XPT well test were used to analyze the quality of source rock, reservoir property, and preservation condition in this study.The kerogens are predominantly type Ⅰ-Ⅱ₁.The vitrinite reflectance ranges from 0.51% to 0.80%.The maturity indicators of C₂₉ sterane in the rocks from the 10th cyclotherm in the Wangchang are obviously different from that of the underlying halite, which indicates that there are migrated oil.The porosity of the reservoir ranges from 7.8% to 26.3%.The halite layers are thick enough (> 6 m) and stable throughout the area distribution; moreover, they did not break during the stage of deposition and burial.With the excellent preservation condition and storage capacity, the hydrocarbon generated from the deeper source rocks within the 10th cyclotherm controlled the shale oil enrichment in higher structural position, while hydrocarbon generated in-situ dominated in the lower structural position.