【摘要】 川东北开江—梁平海槽西侧飞仙关组鲕滩广泛发育，区域内龙会场、铁山等气藏已获取多口高产气井，飞仙关组鲕滩具有巨大的勘探潜力,但飞仙关组鲕滩叠置迁移速度快,存在迁移模式以及平面分布尚不明确等问题。在地震地质分析的基础上，通过对区内钻井、测井资料分析，利用地震地层综合解释剖面，将川东北地区九岭—亭子铺地区飞仙关组划分为两个三级层序，在此基础上对飞仙关组鲕滩不同层序下的展布特征进行研究。结果表明,鲕滩主要发育于台缘带中，SQ1层序内，台缘带在长兴组生物礁的基础上继承性发育，鲕滩顺台缘带零散分布,总面积116.4 km~2;SQ2层序内，海槽填平补齐，台内向海槽前积发育多期台缘带，鲕滩随台缘带期次性发育，分布广泛且规模较大，总面积221.6 km~2。更多还原

【Abstract】 Oolitic shoals of the Feixianguan Formation are extensively developed along the western margin of the Kaijiang-Liangping Trough in the northeastern Sichuan Basin. Multiple high-yield gas wells have been successfully drilled in gas reservoirs(e.g., Longhuichang and Tieshan) within this region, verifying the substantial exploration potential of oolitic shoals in the Feixianguan Formation. However, critical uncertainties remain, including the rapid superimposed migration of these oolitic shoals, as well as the ambiguity regarding their migration patterns and planar distribution. Based on comprehensive seismicgeological analysis, integrated with drilling and logging data of the study area, and leveraging integrated seismic-stratigraphic interpretation profiles, the Feixianguan Formation in the Jiuling-Tingzipu Area of the northeastern Sichuan Basin was subdivided into two third-order sequences. Building on this stratigraphic framework, the distribution characteristics of Feixianguan Formation oolitic shoals under different sequence frameworks were systematically investigated. The results indicate that oolitic shoals are predominantly developed in platform margin belts. Within Sequence SQ1, the platform margin belt developed inheritably on the basis of Changxing Formation organic reefs, and oolitic shoals are scattered along the platform margin belt with a total area of 116.4 km2. Within Sequence SQ2, the trough underwent complete infilling and leveling. Multiple phases of platform margin belts prograded from the platform interior toward the trough, and oolitic shoals developed episodically in conjunction with these platform margin belts, exhibiting extensive distribution and large scale with a total area of 221.6 km2.更多还原