- 责任者：Gao Jixian (School of Earth and Space Sciences ; Peking University ; Beijing 100871 ; China) ; Tian Changbing
- 刊名：Acta Petrolei Sinica
- 出版年：2013
- 卷期：34(5)
- 关键词：碳酸盐岩储集层 ; carbonate reservoirs ; 伊拉克 ; Iraq
- 页码：p.843-852
- 图表：14 illus., 24 refs.
- 分类号：1003
- issnNo：ISSN0253-2697
- isbnNo：CN11-2128/TE
The carbonate reservoir rocks of the Mishrif Formation in the Rumaila oil field, are mainly composed of cryptite, bioclastic wackstone, bioclastic grainstone, bioclastic limestone and dolomitic limestone with various cavities, such as intergranular （dissolved） pores, mould pores, intercrystal pores, micropores, dissolution fractures and pressure-solution fractures, The Mishrif Formation de- velops mainly in a carbonate ramp sedimentary environment and its main subfacies include lagoon, back-shoal, bioclastc shoal, bio- herm, fore-shoal and shallow shelf. There exist severe heterogeneities in interlayers and inner layers of the reservoir. The main dia- genesis types in the Mishrif Formation include micritization, penecontemporaneous cementation, recrystallization, dissolution, buried cementation, compaction-pressolution and dolomitization. The interlayer heterogeneity is mainly controlled by facies migration affect ed by the third-order relative sea-level change. While the main factors controlling the innerlayer heterogeneity are the differential dis- solution and cementation influenced by the fifth-or sixth-order relative sea-level change. Micro-fractures dominated by tectonism can increase local porosity and permeability.