元坝地区须三段天然气富集控制因素
Science & Technology Review（2016）
Abstract
结合层序地层学理论、岩心观察、岩心分析实验结果及钻井测试资料等,分析了元坝地区须三段的层序地层特征、储层岩性特征、储层微观特征及天然气富集的控制因素.目的层储层岩性复杂,以西部发育钙屑砂岩,东部发育岩屑石英砂岩为主要特征.岩心分析实验表明:目的层储层物性差,属于特低孔-低渗次生致密砂岩储层;须三段上部3个砂组天然气相对富集,在富气砂组内有利岩性带、砂体厚度是天然气聚集的基础条件,储层内部发育裂缝和溶蚀孔组合是天然气富集的关键因素.
MoreKey words
Yuanba area,the 3rd member of Xujiahe formation,natural gas distribution,secondary tight sandstone reservoir
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