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致密砂岩气可分为“先成型”深盆气(“连续型气”)和“后成型”致密气,具有低孔低渗、低含气饱和度、高含水饱和度及异常高/低压等特征。气藏的形成受多种因素影响,本文通过烃源岩、储集层、生储盖组合、圈闭及保存条件等方面论述致密气成藏特征,具有持续供烃、富含有机质的泥岩和煤系地层是形成致密砂岩气的主要气源岩;大面积分布的低孔低渗砂岩及网格状的粘土矿物的堵塞是形成致密储集层的主要因素;当气源岩与储集层紧密互层接触时有利于大面积的聚集成藏;动静态圈闭结合提供有利的致密气聚集场所;微弱的构造运动有利于致密气的聚集保存。
Tight sandstone gas can be divided into “first-formed” deep-basin gas (“continuous gas”) and “post-formed” tight gas with low porosity, low gas saturation and high water saturation And abnormal high / low pressure and other characteristics. The formation of gas reservoirs is affected by many factors. In this paper, the characteristics of tight gas reservoirs are discussed in terms of source rocks, reservoirs, source-reservoir-cap assemblages, traps and preservation conditions. The reservoirs are characterized by continuous supply of hydrocarbons, organic matter- Coal-bearing strata are the main source rocks for the formation of tight sandstone gas. Blockage of large-area low-porosity and low-permeability sandstone and grid-like clay minerals is the main factor for the formation of tight reservoirs. When source rocks and reservoirs Closely interlaminar contact is conducive to the accumulation of large areas of accumulation; dynamic and static traps combine to provide favorable sites for tight gas accumulation; weak tectonic movement is conducive to the accumulation of tight gas accumulation.