3D MOVE and 3D STRESS models are used to analyze the fault,fracture shape and distribution of buried hill of carbonate rocks in Lunnan area,including the stress mechanism,stability and slip vector of fault faces,the extension tendency,slip tendency and factors of seepage and leakage of fracture and fault faces.The reservoirs controlled by the fault and fractures are predicted,and the connection and stability of fractures are analyzed,in order to effectively guide exploration and development in the studied area.

The Lunnan Lower Uplift was a sub-order unit of the North Tarim Rise and a multiple oil-gas accumulation play, with the Ordovician buried hill reservoir being an important kind of accumulation play. The Ordovician buried hill created in the period of Later Caledonian to Hercynian orogenies, and got its tectonic framework in the Indosinian movement. Since it experienced multiple reformation by tectonic events and multiple accumulation in Meso-Cenozoic, the oil, gas and water had a complicated distribution. The main characteristics of accumulation and oil-water interface, and formation and evolution of accumulation were discussed then a model for oil-gas reservoir in Lunnan area presented in the paper. The Ordovician buried hill accumulation was preserved within 150 metres under the face of the buried hill, surrounding the hill slopes, where the distribution of crude oil was few influenced by the local structures. Generally speaking, the oil-gas distribution in the Lunnan Ordovician buried hill was chiefly controlled by reservoir space, hydrodynamics and differential entrapment. The oil-water interface in the Lunnan Ordovician buried hill was tilted, and the related reservoir might be a super hydrodynamic trap one, so the oil-gas accumulation had a unique hydrodynamic features.