岩性油气藏 ›› 2026, Vol. 38 ›› Issue (5): 136148.doi: 10.12108/yxyqc.20260513
宋玉麟1(
), 付健1(
), 徐一帆1, 韩俊伟2, 黄诚2, 周华锋2, 杨小凡2
SONG Yulin1(
), FU Jian1(
), XU Yifan1, HAN Junwei2, HUANG Cheng2, ZHOU Huafeng2, YANG Xiaofan2
摘要:
以准噶尔盆地红车断裂带北段石炭系火山岩储层为例,对火山岩岩性、物性、储集空间类型进行了分析;依据毛管压力曲线特征,对孔隙结构进行了划分,并引入孔隙大小分布指数(λ),实现了孔隙结构的定量表征,明确了λ对油水两相相对渗透率、油气充注效率的控制作用;通过相关性筛选最优测井敏感参数,结合线性拟合与 Powell 算法优化建模,构建λ测井定量预测方法,并应用于研究区储层评价。研究结果表明:①红车断裂带北段石炭系火山岩主要发育玄武岩、安山岩、凝灰岩、火山角砾岩及火山碎屑沉积岩,整体为中—低孔、低渗储层,孔渗相关性较差;储集空间为次生孔隙和裂缝构成的孔缝复合型系统。②研究区火山岩储层孔隙结构可分为3类,Ⅰ类毛管压力曲线呈缓坡型,以火山角砾岩为主,孔隙结构、渗流性能最好;Ⅲ类毛管压力曲线呈陡坡型,以玄武岩和安山岩为主,储集性能最差;Ⅱ类介于第Ⅰ与第Ⅲ类之间,以凝灰岩和火山碎屑沉积岩为主;3类储层λ值依次减小,孔隙均一程度逐渐降低。③λ值可定量表征孔隙大小的均一程度与流体可动性,其值越大,孔隙均一程度越高、孔隙结构越好,储层渗流性能及油气充注效率越高。④λ多参数预测公式精度可靠,平均相对误差仅0.13,实井验证预测λ值对储层的评价结果,与气测、试油结论吻合度高。
中图分类号:
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