鄂尔多斯盆地苏5区块盒8段砂体结构与展布特征

发布时间：2018-02-25 17:47

  本文关键词： 砂体结构 砂体对比 储层物性 下石盒子组 苏里格地区　出处：《成都理工大学学报(自然科学版)》2017年05期 　论文类型：期刊论文

【摘要】：研究鄂尔多斯盆地苏里格地区苏5区块下二叠统盒8段砂体特征,确定有利的勘探目标层位。通过岩芯观察,结合测井解释成果,对盒8段沉积相进行研究,确定盒8段下部主要发育缓坡型辫状河沉积,盒8段上部则主要为多河道低弯度曲流河沉积。根据测井曲线形态对盒8段小层砂体进行对比和追踪,确定盒8段砂体在研究区中部主要呈近南-北向展布,在研究区西部主要沿北西-南东向展布,而在研究区东部则呈北东-南西向展布的特征。综合砂岩累计厚度对砂体平面展布及演化特征进行研究,认为物源区构造活动的减缓和河流作用的减弱导致砂体规模逐渐变小。根据砂、泥岩厚度及其组合方式的不同,将盒8段砂体划分为4种结构类型:连续叠置型、间隔叠置型、互层型和透镜型。砂体结构与储集物性存在密切联系,连续叠置型砂体孔隙度和渗透性最高,而透镜型砂体物性最差,盒8段下部砂体结构及储集性能明显优于盒8段上部,为最有利的勘探目标层位。
[Abstract]:The sandbody characteristics of Lower Permian Bo8 formation in Su5 Block, Sulige area, Ordos Basin, are studied, and the favorable exploration target horizon is determined. Through core observation and well logging interpretation results, sedimentary facies of Bo8 formation are studied. It is determined that braided river deposits are mainly developed in the lower part of Bo8 formation, and that the upper part of Bo8 member is mainly multi-channel and low-curvature meandering river deposition. According to the logging curve shape, the sand bodies of small bed in Bo8 member are compared and tracked. It is determined that the sandbodies of section 8 are mainly distributed in the central part of the study area in a nearly south-north direction, while in the western part of the study area, they are mainly distributed along the north-west to the south-east direction. In the eastern part of the study area, the characteristics of distribution and evolution of sand body are studied by integrating the cumulative thickness of sandstone. It is considered that the slowing down of tectonic activity and the weakening of fluvial action in the source area result in a gradual decrease in the size of sand bodies. According to the differences of sand and mudstone thickness and their assemblages, the sandbodies of member 8 are divided into four structural types: continuous overlay type and spaced overlay type. The structure of sand body is closely related to the physical properties of reservoir. The porosity and permeability of continuous superimposed sand bodies are the highest, while the physical properties of lens molding sand bodies are the worst. The structure and reservoir properties of sand bodies in the lower part of the box 8 are obviously superior to those in the upper part of the box 8. Is the most favorable target horizon for exploration.
【作者单位】： 油气藏地质及开发工程国家重点实验室(成都理工大学);中国石油川庆钻探工程公司地质勘探开发研究院;中国地质大学地球科学与资源学院;
【基金】：国家科技重大专项(2016ZX05007)
【分类号】：P618.13
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本文编号：1534551