鄂尔多斯盆地东南部上古生界储集砂岩的成岩作用

发布时间：2019-05-28 23:09

【摘要】：研究鄂尔多斯盆地东南部上古生界砂岩储层特征,以及不同的成岩作用类型与储集性能的关系。通过分析取芯井的岩石薄片、铸体薄片、扫描电镜、能谱分析数据,发现储集砂岩中发育有粒内溶孔、粒间孔、粒间溶孔、晶间孔、溶缝等多种孔缝类型,其中最主要的是粒内溶孔和粒间溶孔;主要成岩作用类型有压实作用、溶蚀作用、碳酸盐矿物、硅质矿物和黏土矿物的形成作用。结合不同砂岩组分与孔隙面孔率的相关性,得到如下结论:(1)压实作用是导致砂岩孔隙度较差的重要原因;(2)增加砂岩整体孔隙度最重要的是溶蚀作用;(3)碳酸盐矿物的形成会导致砂岩孔隙度减小;(4)硅质矿物会一定程度减少砂岩粒间孔;(5)高岭石的形成对增加岩石整体孔隙作用有限,水云母和绿泥石对溶孔和晶间孔的形成不利。
[Abstract]:The reservoir characteristics of Upper Paleozoic sandstone in southeastern Ordos Basin and the relationship between different diagenetic types and reservoir performance are studied. By analyzing the data of rock slice, casting sheet, scanning electron microscope and energy spectrum analysis of core well, it is found that there are many kinds of pore types in reservoir sandstone, such as intragranular dissolved pore, intergranular pore, dissolved fracture and so on. The most important of them are intragranular dissolved pores and intergranular dissolved pores. The main diagenetic types are compaction, dissolution, formation of carbonate minerals, siliceous minerals and clay minerals. Combined with the correlation between different sandstone components and pore surface porosity, the following conclusions are drawn: (1) compaction is an important reason for the poor porosity of sandstone, (2) dissolution is the most important thing to increase the overall porosity of sandstone, and (2) the most important thing to increase the overall porosity of sandstone is dissolution. (3) the formation of carbonate minerals will lead to the decrease of sandstone porosity, (4) siliceous minerals will reduce the intergrain pores of sandstone to a certain extent, and (4) the formation of carbonate minerals will lead to the decrease of sandstone porosity. (5) the formation of kaolinite is limited to increase the overall porosity of rock, while hydromica and chlorite are disadvantageous to the formation of dissolved pores and intergranular pores.
【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);
【基金】：国家自然科学基金项目(41572093,41072083) 成都理工大学优秀创新团队培育计划项目(KYTD201703)
【分类号】：P588.212.3;P618.13

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