石油实验地质2016，Vol.38Issue(2)：224-230,7.DOI:10.11781/sysydz201602224
伊拉克哈勒法耶油田塞迪组碳酸盐岩储层特征及高孔低渗成因分析
Characteristics and origin of high porosity and low permeability carbonate reservoirs in the Sa’ di Formation, Halfaya Oil Field, Iraq
摘要
Abstract
The high⁃porosity and low⁃permeability reservoir in the Sa’ di Formation of the Halfaya oil field in Iraq makes this a special oil and gas reservoir in the Middle East. Reservoir characteristics and the origin of high porosity and low permeability were studied by core observation, cast thin sections, physical property testing and mercury injection experiments. Rocks in the reservoir include grained limestones ( oolitic limestones and lime⁃stones) , packstones, wackestones and micritic limestones. The Sa’ di Formation is characterized by ramp facies, and develops inner ramp and outer ramp subfacies. The lower part of the formation has better physical properties than the upper part. Pores are mainly intrafossil and intragranular. Mercury injection experiments showed a high driving pressure, small throat radius and poor flowability. The reservoir is mainly controlled by sedimentary facies, and the reservoirs of different facies showed different properties. Diagenetic transformation has construc⁃tive effects on the formation of secondary pores, resulting in poor cementation. High porosity and low permeability of the reservoir can be explained by the following factors:(1) Intrafossil pores developed, yet were poorly con⁃nected. (2) Sedimentary environment was featured by poor hydrodynamic conditions, and was poorly reformed. (3) The reservoir was controlled by sedimentary process, and the digenesis impact was very weak. (4) Pore types varied, but had low contribution to permeability.关键词
高孔低渗/储层特征/碳酸盐岩/塞迪组/哈勒法耶油田/伊拉克Key words
high porosity and low permeability/reservoir characteristics/carbonate rocks/Sa ’ di Formation/Halfaya oil field/Iraq分类
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王昱翔,周文,郭睿,伏美燕,沈忠民,赵丽敏,陈文玲..伊拉克哈勒法耶油田塞迪组碳酸盐岩储层特征及高孔低渗成因分析[J].石油实验地质,2016,38(2):224-230,7.基金项目
中国石油股份有限公司“十二五”重大专项项目（2011E－2501）资助。 （）
