岩性油气藏 ›› 2024, Vol. 36 ›› Issue (3): 96105.doi: 10.12108/yxyqc.20240309
卞保力1, 刘海磊1, 蒋文龙1, 王学勇1, 丁修建2
BIAN Baoli1, LIU Hailei1, JIANG Wenlong1, WANG Xueyong1, DING Xiujian2
摘要: 准噶尔盆地石炭系火山岩油气藏是油气勘探的重点领域之一。根据录测井资料、地球化学分析数据及岩石薄片鉴定资料,结合地球物理方法,厘清了准噶尔盆地盆 1 井西凹陷石炭系火山岩油气成藏的主控因素,总结出深层火山岩气藏富集规律,明确了有利勘探方向。研究结果表明:①准噶尔盆地盆 1 井西凹陷风城组烃源岩厚度为 100~300 m,面积约为 5 400 km2,整体进入生凝析油—干气阶段,生气强度大于 20×108 m3/km2,为凹陷提供了丰富的天然气源。②研究区石炭系火山岩岩性复杂,爆发作用形成的安山质火山角砾岩受到风化淋滤作用,可形成物性较好的风化壳型储层。石炭系—二叠系大型不整合面和广泛发育的深大断裂是重要的输导体系,二叠系上乌尔禾组泥岩作为区域盖层,为凝析气成藏提供了保存条件,油藏主要分布在高部位,气藏分布于低部位。③通过“两宽一高”(宽方位、宽频带、高密度)技术,提高地震成像精度,联合时-频电磁技术(TFEM),实现了石炭系火山岩的精细刻画,为深层油气藏的勘探提供了有力支撑。石西 16 井的重大突破,证实了盆 1 井西凹陷石炭系火山岩具有巨大的勘探潜力。
中图分类号:
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