<p>With the strengthening of exploration efforts in Bohai, lithologic traps have gradually become new exploration targets. The Luda 10-56 well area is a newly evaluated gas field dominated by lacustrine fan deposits in Bohai. Well exploration has confirmed that the lacustrine fan has complex rock physical properties and indistinct reflection characteristics. The lithologic sand body reservoir changes rapidly laterally. The distribution range of sand bodies and their internal connectivity relationships are very complex. With limited oil field data, seismic and geological approaches were combined to form a new workflow for detailed characterization of lacustrine fan reservoirs. First, sedimentary microfacies research was conducted based on seismic geomorphological feature analysis in paleoenvironmental settings, which provided favorable facies belts and qualitative predictions for reservoir prediction. Meanwhile, morphology inversion technology based on facies-controlled modeling was used for quantitative reservoir prediction. The purpose of facies-controlled reservoir prediction is to combine microfacies analysis (a genetic method) with inversion-rock physics (a numerical analysis method) to improve the accuracy of reservoir prediction. The above detailed characterization techniques laid a reliable foundation for early development plan research and also have guiding significance for the study of other similar lacustrine fans in the area.</p>