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龙门山系属上扬子地台内晚中新生代断褶构造活动形成的山系。川西断陷区属龙门山系的前陆盆地 ,是地台型海相沉积与前陆型陆相沉积组成的复合型含油气区。超晚期 (N—Q)断褶构造的发育程度控制了龙门山系山前带构造圈闭的发育和裂缝型气藏的形成。印支晚期形成的天井山古隆起因受强烈的超晚期断褶构造活动的影响 ,使原有的油气藏遭到破坏。天井山古隆起北东倾伏端的广元昭化地区 ,发育隐伏断裂系伴生的背斜群 ,是较理想的油气聚集带 ;而天井山古隆起西南倾伏端的绵阳—江油—安县地区 ,为北东向及北西向深断裂交叉复合区 ,是寻找中、浅层次生气藏的有利地区
The Longmen Shan is a mountain system formed by the Late Mesozoic-Cenozoic fold-forming tectonics in the upper Yangtze platform. The western Sichuan depression basin belongs to the Longmenshan foreland basin, which is a compound type of hydrocarbon-bearing area composed of platform-type marine facies and foreland-type continental deposition. The development of the ultra-late (N-Q) fold-fault structure controls the development of the structural traps in the Longmenshan foreland belt and the formation of fractured gas reservoirs. The formation of the Late Paleogene in the Late Paleozoic paleo-Furong was affected by the intense ultra-late fold-tectonic activity that destroyed the original reservoirs. The Paleoshan uplift northeastern dip Guangyuan Zhaohua area, the development of buried fault facies associated anticline, is an ideal hydrocarbon accumulation zone; and the ancient uplift of the Paleoshan uplift southwest Mianyang - Jiangyou - An County area, north The eastward and northwestern deep-fault inter-complex zones are favorable areas for searching for intermediate and shallow secondary gas reservoirs