准噶尔盆地吉木萨尔凹陷芦草沟组湖相云质致密油储层特征与分布规律

被引：67

作者：

宋永 ^{[1
,2
]}

周路 ^{[1
,3
]}

郭旭光 ^{[2
]}

常秋生 ^{[2
]}

王霞田 ^{[2
]}

机构：

[1] 西南石油大学地球科学与技术学院

[2] 新疆油田公司勘探开发研究院

[3] 油气藏地质及开发工程国家重点实验室西南石油大学

来源：

岩石学报 | 2017年 / 33卷 / 04期

关键词：

云质岩; 混积岩; 致密油; 储层; 湖相; 芦草沟组; 吉木萨尔凹陷; 准噶尔盆地;

D O I：

暂无

中图分类号：

P618.13 [石油、天然气];

学科分类号：

070403 [天体物理学];

摘要：

准噶尔盆地东南缘吉木萨尔凹陷中二叠统芦草沟组新近发现了独特的湖相云质混积岩致密油储层,不同于传统的海/湖相硅质/灰质致密油储层,展示出重要的学科研究意义。本文报道了这类储层的基本特征与分布规律。结果表明,这类储层岩性主要由砂屑白云岩、粉砂质白云岩/白云质粉砂岩和微晶白云岩组成,见少量粉砂岩和凝灰岩;储集空间以次生粒间溶蚀孔隙和部分剩余粒间孔隙为主,微裂缝仅在少数样品中发育。储层含油性与物性呈正相关,据此将储层分为三类:一类储层孔隙度>12%,渗透率>0.1m D;二类储层孔隙度7%12%,渗透率>0.01m D;三类储层孔隙度以4%7%,渗透率>0.001m D。前两类是相对优质储层,分布特征表现为南厚北薄,物性南好北差。这种特点受控于沉积相及其物源,南部是主物源区。据此预测了有利储层分布区,其中芦草沟组上甜点段优质储层主要分布在吉32-吉171-吉31井区,下甜点段优质储层主要分布在吉174-吉251-吉36井区。这些认识还可供区域油气勘探参考。

引用

页码：1159 / 1170

页数：12

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