东营凹陷天然气成藏及分布主控因素分析

东营凹陷天然气主要分布于中浅层小于2 000 m的地层,其成藏及分布主要受气源条件、断层、温压条件和区域盖层等因素控制.气源条件是天然气成藏的基础;断裂活动控制了圈闭形成,还为油气流体运移提供通道;温度和压力条件控制了油气运移和分异作用,埋深小于2 000 m有利于天然气分异而形成气藏;区域盖层的时空展布特点决定了天然气的分布.

The Main Control Factors of Natural Gas Reservior Forming and Distribute in Dongying Depression

Natural gas in Dongying depression is distributed primarily in the middle and shallow layer, and its burial depth is less than the 2000m in the underground. The main control factors of natural gas reservior forming and distribute consist of the gas source,the fault,the temperature and the pressure,the region cover rock etc.The gas source is basic of forming natural gas reservoir. The fracture activity not only controls forming of the trap, but also provides for oil-gas-water fluid travel channel way and the shelter condition of the natural gas reservoir.The temperature and the pressure control oil-gas-water fluid migration and differentiation and accumulation, when burial depth of the oil reservoir is less than the 2000m,the natual gas separate very easily form oil and form gas reservoir. The time-space distribution specialty character of the region cover rock decide the accumulation degree of the nature gas.