济阳坳陷深层天然气致密砂岩储集空间成因

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。

GENERATION OFRESERVE SPACES IN DEEPNATURALGAS SANDSTONE RESERVOIRS OF JIYANG DEPRESSION

The key of deep gas exploration is to discover the well-developed porosity zonesin the tight sandstone reservoirs,because the deep natural gas reservoirs are deep in burieddepth,tight in lithological character,senious in diageneses. Examination of more than 180cores from the Eogene sandstones reveals a complex diagenetic history. Diagenetic compexityis a function of depositional environment and burial and thermal history of the depression. The origin of reserve spaces in the tight sandstone is studied.It is considered that the origin ofreserve spaces relates to fluid flow in a great scale in the deep sandstone. The mechanism offluid heat convection cycle cold explains the formation of secondary pore in the deep.So theprediction of deep natural gas detrital reservoir could be defined.