录井工程 ›› 2020, Vol. 31 ›› Issue (S1): 86-94.doi: 10.3969/j.issn.1672-9803.2020.S1.015
牟连刚①, 赵亮②, 屈艳玲②, 王娜①, 周凤春①, 刘绘纺①
MU Liangang①, ZHAO Liang②, QU Yanling②, WANG Na①, ZHOU Fengchun①, LIU Huifang①
摘要: 重力流沉积砂体多具有非均质性强的特征,优质储集层分布是其核心研究内容。以歧口凹陷歧南斜坡区沙一中亚段重力流沉积砂体为研究对象,在已有认识的基础上,运用地震沉积学研究和成岩作用数值模拟方法,构建构造背景下的沉积、成岩一体化孔隙度预测模型,为重力流砂岩储集层质量评价及预测提供了依据。研究区沙一中亚段主要发育三种沉积微相(水道中心、水道边缘和水下漫溢),沉积学研究表明,储集层物性受沉积作用和成岩作用双重控制,原始储集物性上重力流水道中心储集层物性最好,水道边缘次之,水下漫溢物性最差;平面上,沙一中亚段发育南北两个次生孔隙发育区。处于主水道相区的低斜坡区,尽管埋深大,但溶蚀作用强,晚期胶结作用弱,孔隙度仍可达12%以上。重力流水道的孔隙演化与油气成藏过程密不可分,处于生烃中心的重力流水道中心是增储上产的主要目标。
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