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伊拉克A油田Khasib组碳酸盐岩微相 及储层特征

作    者:王 欢1, 石开波2, 赵丽敏3, 刘 波2, 叶玉峰4, 邓 亚3, 沈瑛楚2, 李茜瑶3, 罗清清2, 刘航宇2
单    位:1 中国地质大学(北京)地球科学与资源学院; 2 北京大学地球与空间学院; 3中国石油勘探开发研究院; 4 中油国际勘探开发公司
基金项目:本文受国家自然科学基金项目“深部碳酸盐岩油气储层原位溶蚀模拟实验研究”(编号:41272137)资助
摘    要:
基于大量岩心及薄片资料,通过沉积组构、生物组合、成岩作用等研究,对伊拉克A油田上白垩统Khasib组沉积微相进行识别,共识别出7种微相类型,建立了Khasib组碳酸盐缓坡沉积模式。结合储层物性及压汞数据,通过孔隙类型、物性特征及孔隙结构差异分析,将Khasib组储层划分为高孔高渗、高孔中渗、高孔低渗及低孔低渗等4种类型。对沉积组构的定量-半定量分析表明:沉积组构对储层渗透性具有重要影响,绿藻及内碎屑含量与储层渗透率成正比,灰泥含量与储层渗透率成反比。建议在开发过程中对高孔高渗储层和高孔中渗储层注水时可考虑底部注水,缓慢向上推进;高孔低渗储层作为潜力储层,可通过水平井酸化压裂等储层改造技术进行动用;低孔低渗储层可作为下部优质储层的盖层。
关键词:微相类型; 沉积组构; 沉积模式; 储层特征; Khasib组; 晚白垩世; 伊拉克

Microfacies and reservoir characteristics of carbonate rocks of Khasib Formation in Iraq A Oilfield

Author's Name: WANG Huan, SHI Kaibo, ZHAO Limin, LIU Bo, YE Yufeng, DENG Ya, SHEN Yingchu, LI Qianyao, LUO Qingqing, LIU Hangyu
Institution: 
Abstract:
Based on a large number of core and thin section data, seven microfacies types of the Upper Cretaceous Khasib Formation of Iraq A Oilfield are identified through the study of sedimentary fabric, biological association and diagenesis, and the carbonate ramp sedimentary model of Khasib Formation is established. Combined with reservoir physical property and mercury injection data, through the analysis of pore type, physical property characteristics and pore structure difference, the reservoir of Khasib Formation is divided into four types: high porosity and high permeability, high porosity and medium permeability, high porosity and low permeability, and low porosity and low permeability. Based on quantitative-semi-quantitative analysis of sedimentary fabric, it is shown that sedimentary fabric has an important influence on reservoir permeability, and the contents of green algae and intraclast are directly proportional to reservoir permeability, and the content of lime mud is inversely proportional to reservoir permeability. It is suggested that the bottom water injection should be considered in the process of development for high porosity and high permeability reservoirs, and high porosity and medium permeability reservoirs. As potential reservoirs, high porosity and low permeability reservoirs can be produced by horizontal well acidizing fracturing and other reservoir reconstruction technologies. The low porosity and low permeability reservoir can be used as the cap rock of high quality reservoir in the lower part.
Keywords: microfacies types; sedimentary fabric; sedimentary model; reservoir characteristics; Khasib Formation; Late Cretaceous; Iraq
投稿时间:2020-12-22  
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