应用物理模拟研究碎屑岩储层物性演化特征:以胜利油区古近系沙河街组为例

发布时间：2018-05-28 01:23

本文选题：物理模拟 + 碎屑岩储层　；参考：《高校地质学报》2017年04期

【摘要】：为定量恢复地质历史时期碎屑岩储层物性参数的演化特征,以胜利油区古近系沙河街组为例,采用物理模拟实验对纯压实作用下不同的粒度、分选、沉积相类型及不同地层流体性质的砂岩储层孔隙度和渗透率的变化规律进行研究。结果表明:物源相同时,分选、磨圆类似的岩石,随着粒度的增大,孔隙度减小、渗透率则增大;而对于粒径范围相同、分选不同的岩石,其孔隙度和渗透率均同分选呈现较好的正相关性,即分选越好物性也越好。在不同地层流体条件下,储层抗压能力不同,酸性水介质条件下岩石抗压能力最小,且随着埋深增加孔隙度减少的速率相对较快;而在碱性水介质下,其孔隙度随深度的变化速率则相对较慢;当地层流体介质发生改变时,即酸碱度降低至中性水介质条件时,抗压实能力则会得到一定程度的恢复。总体上,碎屑岩储层的孔隙度同埋深基本呈现对数关系,渗透率与埋深均呈指数关系。模拟实验结果与实际埋深相对较浅的碎屑岩储层(小于2500 m)孔隙度演化特征吻合度较高,表明在浅层影响储层物性的因素主要为压实作用;而中深层的储层物性影响因素较多,其定量化研究还需综合考虑其它参数。
[Abstract]:In order to quantitatively restore the evolution characteristics of physical parameters of clastic reservoir in geological history, taking the Shahejie formation of Paleogene in Shengli oil area as an example, different granularity and sorting under pure compaction were studied by physical simulation experiment. The variation of porosity and permeability of sandstone reservoir with different formation fluid properties and sedimentary facies types are studied. The results show that when the material source is the same, the porosity decreases and the permeability increases with the increase of particle size, while for the rock with the same particle size range, the rock is separated with the same particle size. The porosity and permeability show a good positive correlation with the separation, that is, the better the separation, the better the physical properties. Under different formation fluid conditions, the reservoir pressure resistance is different, and the rock pressure resistance is the least in acidic water medium, and the decrease rate of porosity decreases relatively quickly with the increase of buried depth, but in alkaline water medium, The change rate of porosity with depth is relatively slow, and when the local layer fluid medium changes, that is, when the pH decreases to neutral water medium, the compaction resistance will be restored to a certain extent. In general, the porosity of clastic reservoir is logarithmic with the buried depth, and the permeability is exponentially related to the buried depth. The simulation results agree well with the porosity evolution characteristics of clastic rock reservoirs (less than 2500 m), which indicate that compaction is the main factor that affects reservoir physical properties in shallow layer, but there are many factors affecting reservoir physical properties in middle and deep layers. The quantitative study also needs to consider other parameters synthetically.
【作者单位】：中国石油大学(北京)地球科学学院;中国石油大学(北京)油气资源与探测国家重点实验室;中国石化胜利油田公司勘探开发研究院;
【基金】：国家自然科学基金项目(41672098;41272157) 国家油气重大科技专项(2016ZX05006-006)联合资助
【分类号】：P618.13

【相似文献】