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裂缝型气藏是川东北地区重要的勘探目标之一,但对裂缝储层的发育特征和气藏的充注历史研究相对薄弱。本文利用岩心和成像测井分析裂缝特征,并结合流体包裹体测试技术确定通南巴构造带裂缝型气藏天然气充注时间。研究结果表明:①裂缝型储层主要分布在飞三段(T1f3)的鲕粒灰岩和嘉二段(T1j2)的砂屑灰岩中,以高角度缝和垂直缝为主;②裂缝走向与邻近断裂走向一致,受中燕山运动以来大巴山构造北东—南西向推覆挤压作用,大致形成于晚侏罗世;③流体包裹体测温揭示天然气充注时间为晚侏罗世(160～148Ma);④裂缝发育时间与烃源岩生气高峰相匹配是控制通南巴构造带天然气充注时间的关键因素。
Fractured gas reservoirs are one of the important exploration targets in northeastern Sichuan, but the research on the developmental characteristics of fractured reservoirs and the filling history of gas reservoirs is relatively weak. In this paper, the core and imaging logs are used to analyze the fracture characteristics and the fluid inclusion testing technique is used to determine the natural gas charging time of the Tongnanba structural zone fractured gas reservoirs. The results show that: (1) the fractured reservoirs are mainly distributed in the T1f3 oolitic limestone and the Jiajisang (T1j2) sand-litst limestone, with high-angle and vertical fractures as the dominant ones; ②the fractures Which is consistent with the adjacent faults. Since the Mid-Yanshanian movement, the Dabashan structure was formed by the NE-NCP thrusting and extrusion, which formed roughly in the Late Jurassic. (3) The temperature of the fluid inclusions revealed that the filling time of the gas was Late Jurassic 160 ~ 148Ma). ④ The matching of fracture development time and gas source rock peak is the key factor controlling the filling time of natural gas in Tongnanba tectonic belt.