天然气地球科学 ›› 2022, Vol. 33 ›› Issue (3): 396407.doi: 10.11764/j.issn.1672-1926.2021.07.002
张琴1,2(),邱振1,2(),张磊夫1,2,王玉满1,2,肖玉峰1,2,刘丹1,2,刘雯1,2,李树新3,李星涛3
Qin ZHANG1,2(),Zhen QIU1,2(),Leifu ZHANG1,2,Yuman WANG1,2,Yufeng XIAO1,2,Dan LIU1,2,Wen LIU1,2,Shuxin LI3,Xingtao LI3
摘要:
鄂尔多斯盆地东缘大宁—吉县地区二叠系山西组山2段为海陆过渡相沉积,其中山23亚段具有页岩厚度大、夹层少而薄的特点,是目前中国海陆过渡相页岩气勘探开发的重点目标层段,但其储层特征等相关研究相对较少,特别是优质储层发育的主控因素有待进一步明确。综合利用有机地球化学分析、矿物成分分析以及储层微观刻画等技术手段,对大宁—吉县区块山23亚段的储层特征进行系统研究并探讨优质储层发育的主控因素。研究结果表明:山西组山23亚段上部潟湖相(底部)页岩层段具有高TOC含量、高脆性矿物含量、高BET和高BJH的特征,是最优质的页岩气储集层段;山23亚段页岩孔隙构成以黏土矿物晶间孔为主体,占总孔隙体积的76.9%,有机质孔占18.7%;扫描电镜观察显示不同矿物组分的孔隙大小分布特征不同,其中有机质孔和方解石溶蚀孔以中孔为主,黏土矿物与石英则主要发育中孔与宏孔,黄铁矿与长石孔径范围分布广,且分布较为均匀。单因素分析显示黏土矿物含量是影响山23亚段海陆过渡相页岩孔隙发育的第一控制要素,有机质含量对页岩孔隙发育存在着一定影响,有机质类型则对页岩孔隙发育的影响不明显。
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