THE DISTRIBUTION AND CONTROL FACTORS OF PHASE STATE OF OIL AND GAS POOLS IN KUQA PETROLEUM SYSTEM
库车油气系统油气藏相态分布及其控制因素

The phase state and distribution rule could recognized clearly and its control factors could investigation, as a means of the PVT experimental data of 80 layers and the physical and chemical characters of these hydrocarbons produced from oil and gas pools in Kuqa petroleum system. The main type was gaseity and subordinative type was liquid in hydrocarbon fluid system in this system. The system divided two or three belts-south, middle and north, and two segments-east and west, and the north belt was rich in gas pools, including dry gas pools and wet gas pools as will as poor condensate gas pools, and the south belt contained more abundant condensate gas pools with fewness partner oil pools and volatilty oil pools. However the west segment of whole system contained more superabundant and abundant condensate gas pools and oil pools in this system, for example the Yangtake, Qule and Wush(Yilake) regions concentrated abundant condensate gas pools and oil pools. It would be characteristic of history of forming-pool of the early stage accumulated normal oil and abundant condensate gas on south belt in main, late stage accumulated dry gas, wet gas and pool condensate gas on north belt in main. Naturalness more dryer gas generated during late stage would charged into the early pools, and the hydrocarbon fluid system in these pools changed them phase state owing to them component admixed each other. Of course the early traps profited forming abundant condensate gas pools and oil pools, whereas the late traps were prone to form more dryer gas pools. So the traps surrounding early uplift and on early uplift were prone to form normal oil and abundant condensate gas. Special most lithologic traps formed early stage and could be finded more rich-oil pools.