徐家围子地区深层天然气成藏机制及有利勘探区预测Study on Deep Gas Reservoir Forming Mechanism of Xujiaweizi Area and Prediction of Favorable Exploration Areas
付广,石巍
FU Guang,et al.(Earth Science Institute of Daqing Petroleum Institute
摘要(Abstract)：
通过天然气藏分布与其成藏条件叠合研究,得到徐家围子地区深层天然气成藏与分布的主控因素是气源、盖层、断层与不整合面。充足的气源不仅是气藏形成的物质基础,而且控制其分布;优质盖层的分布控制着天然气的分布,盖源的时间匹配关系控制着该区深层天然气富集数量;断裂空间延伸层位控制着天然气垂向上的运聚层位,断裂活动时期控制着天然气垂向运聚时期,断裂封闭为天然气聚集提供了遮挡条件;不整合面是天然气侧向运移的输导通道,且为天然气的聚集提供了场所。天然气主要有泉头组、嫩江组和明水组沉积末期3次成藏期。天然气成藏具有4种模式,宋西断裂带、徐西断裂带、榆西断展构造带、宋站低隆起、丰乐低隆起和安达次坳是天然气勘探的有利地区。
Through study on gas reservoirs distribution and their reservoir forming conditions,this paper concludes that master controlling factors of deep gas reservoir forming are gas resource,cap rock,fault and unconformity surface.Adequate gas resource not only is the material basis for gas reservoirs forming but also controls their distribution.Better cap rocks distribution controls gas distribution,and time matching relation of cap rock resource controls deep gas accumulation amount in this area.Spatial extension horizon of fractures controls vertical migration and accumulation horizon of gas,fracturing activity period controls vertical migration period of gas,and fracturing seal provides barrier condition for gas accumulation.Unconformity is transforming channel for lateral migration of gas,and provides accumulation place for gas.There are 3 reservoir forming periods including Quantou Member,Nenjiang Member and Minshui Member.There are 4 reservoir forming patterns.Songxi fracture belt,Xuxi fracture belt,Yuxi fault extension structure belt,Songzhan low uplift,Fengle low uplift and Anda sub-depression are favorable exploration areas
关键词(KeyWords)：
徐家围子;深层;天然气;成藏模式;有利勘探区
Xujiaweizi;deep;gas;reservoir forming pattern;favorable exploration area
基金项目(Foundation): 国家“973”重大基础研究项目(2001CB209104)资助成果
作者(Author):
付广,石巍
FU Guang,et al.(Earth Science Institute of Daqing Petroleum Institute
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