The genetic method plays a crucial role in understanding hydrocarbon accumulation processes, resource grading evaluation, and predicting remaining resources. However, the establishment of a comprehensive key parameter system for this method remains incomplete, which severely constrains the advancement of conventional petroleum exploration. Taking Member 3 of the Shahejie Formation (Es₃⁾ in the Qikou Sag, Bohai Bay Basin as the study target, research on key parameters for conventional petroleum resource evaluation using the genetic method was conducted by integrating geochemical analysis, hydrocarbon generation pyrolysis experiments, basin modeling, and the Analytic Hierarchy Process (AHP). The results show that the lower limit of Total Organic Carbon (TOC) for effective source rocks in Es₃ ^{is 0.85%.} The peak oil generation occurs at 375 °C (R_o = 1.00%), with a petroleum yield of 629.84 mg/g TOC and hydrocarbon generation intensity ranging from 0 to 1500×10? t/km2. The Minghuazhen Period represents the critical hydrocarbon accumulation phase in the study area. Migration-accumulation streamline modeling delineates four hydrocarbon migration-accumulation units: Banqiao, Qibei-Qinan, Chengbei, and Beitang. Utilizing AHP to establish analog criteria for migration-accumulation coefficients, the calculated values are 12.19% for Banqiao, 2.83% for Beitang, 6.89% for Qibei-Qinan, and 8.30% for Chengbei. Based on these key parameters, the total hydrocarbon generation in Es₃ ^{is estimated at} X t, with resources quantified at Y t. This study aims to refine the parameter system for genetic-method-based conventional petroleum resource evaluation and provide guidance for the exploration and development of remaining hydrocarbon resources.