岩性油气藏 ›› 2023, Vol. 35 ›› Issue (5): 3748.doi: 10.12108/yxyqc.20230504
杜江民1,2, 崔子豪1,2, 贾志伟3, 张毅3, 聂万才4,5, 龙鹏宇1,2, 刘泊远1,2
DU Jiangmin1,2, CUI Zihao1,2, JIA Zhiwei3, ZHANG Yi3, NIE Wancai4,5, LONG Pengyu1,2, LIU Boyuan1,2
摘要: 鄂尔多斯盆地苏里格地区奥陶系马家沟组马五5亚段勘探潜力巨大。通过岩心观察、薄片鉴定、扫描电镜分析和地球化学测试,结合地球物理技术,对苏里格地区奥陶系马家沟组马五5亚段沉积特征进行了系统研究,探讨了其油气地质意义。研究结果表明: ①苏里格地区奥陶系马家沟组马五5亚段属于整体海侵、晚期海退沉积背景下的向东倾斜的碳酸盐岩台地相,发育开阔台地和局限台地等亚相,可根据成分细分为云坪、灰坪和台内滩、云灰坪、灰云坪等微相。②研究区平面上沉积环境呈典型条带状展布,西部地区沉积水体盐度偏高,具有局限台地特征;东部地区沉积水体盐度偏低,具有开阔台地特征。③研究区的局限台地与开阔台地内部的低洼区域,高密度富Mg海水汇聚,为白云岩发育的有利区。④局限/开阔云坪相、台内滩和含膏云坪微相主要发育各种白云岩储层,连片发育白云岩的西、北部地区是潜在的油气勘探接替领域。
中图分类号:
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