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川西坳陷家河组（T3x）上、下盆结构性沉积重建,控制生储盖层发育和早期非构造圈闭。持续生烃和压实封闭是普遍超压的主因，现代地压状况是晚期构造改造的结果。须三段厚大生烃泥岩作为压力封隔，须二砂岩段可能蕴藏很大资源。本文建立了川西坳陷T3x成藏理论特征基础，用来预测气藏规模（Dg):Dg≈f(,E,d),f(S^FU!)，突出早期聚集与晚期构造相结合。主要矛盾是T3x储层普遍超致密化，关键在于晚期背斜的造缝能力。由于地史 中成藏、僵滞、重组等关系非常复杂，找到T3x大储量气田要下大功夫，必须在成藏理论和勘探技术两个方面都有实在的进展。

Recognition of Xujiahe Formation (T3x) Gas Reservoirs in West Sichuan Depression

The source-reservoir-caprock assemblage and early non-structural trap formation are controlled by the basin-structural sedimentary formations over and under T_3 x .The superpressures mainly result from sustained hydrocarbon-generation and compaction seal and the current geopressure circumstances are the result caused by late tectonic movements.Because the thick T_3 x 3 mudstones are not only the source rocks but also the pressure confining beds,the T_3 x 2 sandstones may be rich in gas resources.A theoretical characteristic pattern of T_3 x gas reservoir formation in West Sichuan Depression was set up,in which the combination of early accumulation with late structure is emphasized.The key factor is the fissure-formed capacity of the late anticline,because of a general super compactness found in T_3 x reservoir.Owing to the fact that the relation between the reservoir formation and the hydrocarbon stagnancy and retrapping was very complicated in geological history,it is not easy to find a gas field with large reserves in T_3 x .Therefore it is necessary to make a real development in both gas reservoir formation theory and exploration technology.This paper is written for above purpose.