Abstract：Capella Oilfield faulted in east and overlapped in west, is a narrow rift lacustrine basin. On the one hand, this basin is characterized by a variety types of deposition facies on its gentle slope belt and seismic reflection characteristics are complex. On the other hand, multi-source clastic material are difficult to be identified since the short axis of the basin is short and the multi-source clastic material deposit from different direction and overlap in the lake center. Conventional seismic facies models of faulted depression basin can achieve good results in the steep slope zone and in the long axis of the entrance area of Capella area, while they have difficulties in identifying deposits of different sedimentary facies in the gentle slope area and in the lake center. In this article, we show a detailed analysis on the developmental characteristics of Capella faulted depression basin, and put forward solutions to the difficulties of seismic facies model building. On the basis of studies on sedimentary system of Capella faulted depression basin, we have found out seismic facies characteristics of different deposits, and finally established a set of seismic facies models of narrow faulted depression basin, which provide a theoretical basis for interpretation and evaluation on sedimentary facies and reservoir prediction in this type of basins.
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