The Formation Conditions and Patterns of Condensate Gas Reservoirs in Jiyang Depression

In recent years,the condensate gas reservoir was a new type of reservoirs for oil and gas exploration in Shengli Oilfield,it was presented that it was a special reservoir,which was different with oil reservoirs and gas reservoirs.The condensate gas reservoir belonged to high condensate oil and low oil in Jiyang Depression,it was mainly distributed in deep salt-lake layers and the Paleozoic strata,the condensate gas reservoir was deeply buried with the characteristics of high temperature and pressure and high productivity of single-well.High maturity evolution was one of the internal factors of condensate gas reservoirs,high temperature and high pressure was the external factors,high-quality reservoir was the important condition of the condensate gas accumulation,high-quality cover was an important guarantee of dynamic balance state.Two condensate gas reservoir models of the Cenozoic generation and Cenozoic hydrocarbon accumulation are established in Jiyang depression,the type of Cenozoic generation and accumulation reservoirs are mainly distributed in fault tectonic belt of the deep sag,the type of Cenozoic generation and Palaeozoic accumulation reservoirs are mainly distributed in the buried hill tectonic belt near the sag,and the advantageous distribution of two types of condensate gas reservoirs are forecasted.