束鹿凹陷沙三段下亚段细粒碳酸盐纹层特征与储集意义

发布时间：2018-01-08 22:01

本文关键词：束鹿凹陷沙三段下亚段细粒碳酸盐纹层特征与储集意义　出处：《油气地质与采收率》2016年04期 　论文类型：期刊论文

【摘要】：纹层状泥灰岩是束鹿凹陷源储一体式致密油藏的重要组成部分,却笼统地概括了岩心上单层厚度小于1 cm的细粒碳酸盐岩,忽视了纹层的显微几何特征和成分上的不同。基于对岩心和薄片的观测,利用矿物X衍射、电子探针和同位素测试等方法,对纹层沉积特征和储集意义进行研究。研究区富碳酸盐细粒纹层分为季节型韵律纹层组合和浊流型粒序纹层组合2类。前者是水文季节变化控制下的物理、化学、生物共同作用的湖相沉积物,组成季节型纹层状泥灰岩;后者是事件性的浊流沉积物,组成浊流型纹层状泥灰岩和纹层状粉砂岩。不同纹层组合对储层储集性能具有控制作用,其中季节型韵律纹层组合层间缝发育,所含有机质在热演化过程中可以改善储集性能,所以季节型纹层状泥灰岩储集性能优于浊流型纹层状泥灰岩和纹层状粉砂岩。
[Abstract]:Laminated mudstone is an important part of integrated reservoir tight reservoir in Shulu sag, but it generalizes the fine carbonate rock with single layer thickness less than 1 cm on the core. Based on the observation of core and sheet, the methods of mineral X-ray diffraction, electron probe and isotope measurement are used. The sedimentary characteristics and reservoir significance of the laminae are studied. The carbonate-rich fine-grained grain layers in the study area are divided into two types: seasonal rhythmic grain assemblage and turbidimetric grain-sequence grain assemblage. The former is the physics controlled by hydrological seasonal variation. The lacustrine sediments of chemical and biological interaction form seasonal lamellar marl; The latter is an eventful turbidite sediment, which is composed of turbidite lamellar marl and lamellar siltstone. Different laminar assemblages have a controlling effect on reservoir performance, in which seasonal rhythmic laminar assemblage interlayer fractures are developed. The organic matter contained can improve the reservoir performance in the process of thermal evolution, so the reservoir performance of seasonal laminated mudstone is better than that of turbidite lamellar marl and lamellar siltstone.
【作者单位】：中国地质大学(北京)能源学院;中国地质大学(北京)科学研究院;
【基金】：国家科技重大专项“重点油气勘探新领域储层地质与评价”(2011ZX05009-002)
【分类号】：P618.13
【正文快照】： 纹层是湖相细粒碳酸盐岩一个非常普遍的特征[1],早在1920年,Nipkow就在瑞士苏黎世湖的沉积物中识别并描述了一类浅色且富含方解石的纹层[2]。纹层并非是物质连续缓慢堆积的结果,而是记录了一系列的沉积事件[3],包括重力流[1]、季节变化引发的水体翻转[4]、生物诱导的化学沉淀[

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