<p>The eastern branch of the Tanlu Fault Zone in the southern section of Bohai Sea is a significant hydrocarbon accumulation belt. Many scholars have conducted in-depth research on it and achieved notable research outcomes. However, its strike-slip fault model and its controlling mechanisms on hydrocarbon accumulation remain poorly understood. Based on high-resolution 3D seismic data, this study systematically reveals that the study area exhibits a tectonic pattern of north-south segmentation and temporal evolutionary differentiation. In the Bonan segment, NNE-trending inherited strike-slip faults are developed, showing a distinct feature of early activation and late attenuation. In the Bodong segment, the tectonic framework is significantly modified by extensional-strike-slip superimposition, forming a complex tectonic assemblage where NE-trending boundary faults coexist with NNE-trending blind strike-slip faults. The latter display a layered evolutionary pattern, with the deep strata experiencing early attenuation and the shallow strata developing an en-echelon arrangement. Based on fault properties and dynamic mechanisms, this study established five fault models: inherited strike-slip, blind strike-slip, extensional-strike-slip, strike-slip-extensional, and extensional faults. It clarified the fault genesis mechanisms under the joint control of pre-existing structures, regional stress fields, and rock mechanical properties. The fault system exerts dual controls on hydrocarbon accumulation in terms of migration and trapping: the coupling between fault activity episodes and hydrocarbon generation-expulsion timing determines the transport efficiency. The local stress field controls the preferential direction of hydrocarbon migration. The three types of trap-controlling types, S-type, overlapped type, and connection type, are jointly governed by fault geometry and multi-stage tectonic superposition. On this basis, six hydrocarbon accumulation models corresponding to the fault models were innovatively summarized, including composite extensional-strike-slip, blind strike-slip flower heart, multi-source adjustment, composite flower structure, tilted fault block, and overlapping pressure enhancing model. This reveals the intrinsic correlation between fault characteristics and hydrocarbon accumulation elements, providing important theoretical support and practical guidance for hydrocarbon exploration in the study area..</p>