寻找深层天然气致密砂岩储层中有利的次生孔隙带是深层天然气勘探中值得重视的问题，本文通过分析成岩作用及沉积环境对储集性的影响。对致密砂岩中次生孔隙的成因进行了探讨．认为致密砂岩储集孔间的成因与深层有一定规模的流体运动有关。用流体热对流循环机制较好地解释了深层次生孔隙带的形成，从而指出了济阳坳陷深层天然气的有利分布带。 Looking for the favorable secondary pore zone in deep natural gas tight sandstone reservoirs is an issue that deserves attention in deep natural gas exploration. This paper analyzes the diagenesis and the influence of sedimentary environment on reservoir properties. The causes of secondary porosity in tight sandstone are discussed. It is considered that the formation of tight sandstone reservoirs is related to the fluid movement with a certain depth in the deep layer. The hydrothermal convection circulation mechanism is used to explain the formation of deep secondary pore zone, which indicates the favorable distribution zone of deep natural gas in Jiyang depression.