Abstract:

In the Shun 9 well area an oringinal oil pool has been found in the Lower Member of Kepingtage Formation in Shuntuoguole region in Tarim basin. The sedimentary environment is analyzed that is from bathyal to shallow sea to delta,based on integrated interpretation of core, log and seismic data.The sandstone reservoirs are considered to be delta frontal channel mouth bar and distributary channel sand bodies form north to south,in the upper part in the Lower Member of Kepingtage Formation. Tazhong uplift that is closer to Shun 9 well area does not provide terrigenous clastic masses. But during the late deposition of Lower Member of Kepingtage Formation the environment transformed gradually into deltaic and tidal flat. Due to the late tectonic north-dip tilting, the present structure background of oil field belongs to an north dipping slope developed  locally low amplitude structures. The founded types of oil pools are dominated by lithological traps associated delta sand body upward pinchout, with partial low amplitude structure traps and lithologic-structural compound traps. Favorable traps are located in the delta front and some structural highs.

Key words: original oil pool, lithology-structure compound traps, sedimentary system, the Lower Member of Kepingtage Formation, reservoir forecasting