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松辽盆地特有的深部构造背景和裂谷演化特征,造成盆地内含CO_2火山岩气藏的形成和富集。松辽裂谷盆地中新生代火山岩浆活动发育,总体上具有多期喷发、分布广泛和储集条件良好的特点。火山活动以中心式喷发为主,主要发育中基性-酸性火山岩,发育流纹岩、凝灰岩等多种岩石类型,爆发相和溢流相2种火山岩相。中生代火山岩在盆地内分布广泛,营域组构成深层有利储层,新生代火山岩在盆地外围出露较多,而在盆内出露较少。盆地高含量的二氧化碳为无机幔源成因,由青山口期和新生代幔源岩浆脱气形成。含CO_2火山岩气藏的形成主要受深部构造背景、深大断裂和中新生代火山岩控制。已发现含CO_2火山岩气藏主要分布于古中央隆起带及其两侧断陷的营城组火山岩中,具有点状、带状分布,局部富集的特点。根据主控因素分析,预测了5个CO_2富集区带。
The deep tectonic setting and rift evolution in the Songliao Basin have resulted in the formation and enrichment of CO_2 volcanic gas reservoirs in the basin. The Mesozoic-Cenozoic volcanic magma in the Songliao rift basin is characterized by multiphase eruptions, extensive distribution and good reservoir conditions. The volcanic activity is mainly centered eruption, which mainly develops two kinds of volcanic facies such as basic-acidic volcanic rock, rhyolite and tuff, various rock types, eruption phase and overflow phase. The Mesozoic volcanic rocks are widely distributed in the basin, and the campsite formations constitute deep favorable reservoirs. The Cenozoic volcanic rocks are exposed more in the periphery of the basin and less in the basin. The high carbon dioxide in the basin is caused by inorganic mantle source and is formed by the degassing of the Qingshankou and Cenozoic mantle magma. The formation of CO_2 volcanic gas reservoirs is mainly controlled by deep tectonic setting, deep faults and Mesozoic-Cenozoic volcanic rocks. It has been found that CO_2-containing volcanic gas reservoirs are mainly distributed in the Yingcheng volcanic rocks of the Yingcheng Formation in the Paleo-Central uplift belt and its faulting on both sides, and have the characteristics of point-like, belt-like distribution and local enrichment. According to the master factor analysis, five CO_2 enrichment zones were predicted.