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

发布时间：2018-06-20 00:06

本文选题：云质岩 + 混积岩　；参考：《岩石学报》2017年04期

【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。
[Abstract]:The Lucaogou formation of the Middle Permian in the southeast margin of Junggar Basin has recently discovered a unique lacustrine cloud mixed rock dense oil reservoir, which is different from the traditional sea / lacustrine siliceous / gray tight oil reservoir, which shows important academic significance. This paper reports the basic characteristics and distribution of this kind of reservoir. The results show that the lithology of this kind of reservoir is mainly composed of sandclastic dolomite silty dolomite / dolomite siltstone and microcrystalline dolomite with a small amount of siltstone and tuff. The reservoir space is mainly composed of secondary intergranular dissolved pores and some residual intergranular pores, and microfractures are only developed in a few samples. There is a positive correlation between reservoir oil content and physical property, according to which the reservoir is divided into three categories: one type reservoir porosity 12, permeability 0. 1m D; the second class reservoir porosity 7%, permeability 0. 01 D; the third type reservoir porosity is 4? 7, permeability 0. 001m D. The first two types are relatively high quality reservoirs. The distribution features are thin in the south and thick in the north and poor in the physical properties in the south and the north. This feature is controlled by sedimentary facies and their provenances, and the south is the main source. Based on this, the favorable reservoir distribution area is predicted, in which the high quality reservoir of the upper dessert member of the Lucaogou formation is mainly distributed in the well area of Ji 32-Ji 171-Ji 31, and the high quality reservoir of the lower dessert section is mainly distributed in the area of well Ji 174- Ji 251- 36. This understanding can also be used as a reference for regional oil and gas exploration.
【作者单位】：西南石油大学地球科学与技术学院;新疆油田公司勘探开发研究院;油气藏地质及开发工程国家重点实验室西南石油大学;
【基金】：国家科技重大专项项目(2011ZX05001-006)资助
【分类号】：P618.13

【相似文献】