中文摘要：

通南巴（通江—南江—巴中）构造是一个ENE向展布的大型背斜构造,已发现河坝飞仙关组三段和嘉陵江组二段两个气藏。本文在区域构造-沉积演化、通南巴构造的形成期次与变形样式研究基础上,从构造与圈闭特征、储层特征与盖层条件、气藏流体性质、温压系统等方面开展气藏特征研究,最后分析烃源岩演化史及其与构造-圈闭演化史的匹配关系,总结成藏模式。研究认为河坝飞仙关组三段、嘉陵江组二段气藏的形成模式与前人总结的川东北成藏模式不尽相同,有其一定的特殊性。在印支晚期-燕山早期,通南巴构造形成雏形,幅度小,两翼极平缓,故捕获早期油气的能力较差;燕山中晚期,形成幅度巨大的构造,且处于南倾斜坡,有利于源岩干酪根和早期液态烃的大量裂解气运聚,此乃成藏的主要阶段。进入喜马拉雅期,NW向断裂对通南巴构造主体的改造和叠加,对早期形成的气藏系统进行分割、调整,最终形成以高点为中心、气水界面有别的若干气藏。同时,构造整体大幅度抬升,由于封闭条件好,气藏压力不降,从而形成高压气藏。

英文摘要：

Tongjiang--Nanjiang--Bazhong Structure Belt is a large NE--striking anticline, and up to now, two gas-pools have been found in the Heba area among this belt, i.e. the second section of the Jialingjiang Formation and the third section of the Feixianguan Formation. In this paper, based on the regional tectonic evolution, the formation stages and the deformation styles of the Tongjiang--Nanjiang--Bazhong anticline, the gas-pool characteristics have been studied on several aspects, such as structure, trap, reservoir, cover, fluid and temperature-pressure system, and then, the relationship between source evolution and tectonic-trap evolution have also been discussed. The results showed that the evolution model of gas-pool in the Heba area is differential to the model deduced from previous studies in the Northeast Sichuan. Firstly, the Tongjiang--Nanjiang--Bazhong anticline initially formed at the Late Indosinian to Early Yanshan epoch with two very gentle flanks, and had little capture ability to oil and gas at that then. Secondly, this anticline became a large scale structure belt south to a slope at the Middle to Late Yanshan epoch, and had captured a large number of the split gas of kerogen in the source rocks and of the early liquid hydrocarbon. Thirdly, the Tongjiang--Nanjiang--Bazhong Structure Belt was remoulded and superimposed by NW direction faults during the Himalayan epoch, and the prior gas-pool systems were divided into several gas-pools with different traps and gas-water surfaces. Meanwhile, the structure belt was greatly uplifted, and formed high-pressure gas-pools due to good cover condition.