摘要
裂缝是碳酸盐岩储层中常见的储集空间类型,发育程度影响油气在开发中的渗流特征。以伊拉克东南部B油田Mishrif组海相碳酸盐岩储层为例,利用岩心观察、薄片及岩心分析资料,结合阵列声波测井、地震解释及生产动态资料,研究B油田Mishrif组储层裂缝特征,分析裂缝发育控制因素及其对注水开发的影响。结果表明:研究区Mishrif组储层以孔隙型为主,局部发育宏观与微观微裂缝,其中宏观裂缝以构造缝为主,微观裂缝包括颗粒破裂缝、溶蚀缝及压溶缝。岩心及阵列声波测井显示研究区裂缝具有一定的渗流能力。研究区微裂缝的发育受岩性、构造应力场及成岩作用的影响。对于注水开发,微裂缝的发育既可以提高生产井的产能,又能促使注入水快速突破。合理控制注水井注入量,可以延缓注入水突破时间,提高油藏开发效果。该结果对相似碳酸盐岩油藏开发具有指导意义。
Fracture is a common reservoir space type in carbonate reservoirs,and the degree of development in reservoir directly impact the seepage characteristics of oil and gas development.Taking the carbonate reservoir of Mishrif Formation in B Oilfield in the southeast of Iraq as the research target,fracture characteristics,the controlling factors and their influence on water injection development are analyzed by core observation,thin section analysis,core analysis data,array acoustic logging and seismic interpretation result,and dynamic production data.The results show that the reservoir is dominated by porous type,and two types of micro-fractures locally develop in Mishrif Formation,macro fractures are mainly tectonic fractures,micro fractures including grain breakage fractures,corrosion fractures and stylolites.Core analysis and array acoustic logging show that the micro-fracture has a certain seepage capacity.The development of micro-fractures is controlled by lithology,tectonic stress and diagenesis.The analysis of actual dynamic production data show that the development of micro-fractures in reservoirs can improve the productivity of producers,however,the reservoir with micro-fractures can lead to water rapid breakthrough in the process of water injection development.Therefore,the reasonable control of water injection rate can delay injection water breakthrough time and improve reservoir development effect.This understanding provides important guiding significance for the development of similar carbonate reservoirs.
作者
陈培元
CHEN Peiyuan(International Company Limited of CNOOC,Beijing100028,China)
出处
《东北石油大学学报》
CAS
北大核心
2019年第6期62-72,I0005,共12页
Journal of Northeast Petroleum University
基金
国家科技重大专项(2017ZX05032-004-001)
关键词
注水开发
控制因素
微裂缝
碳酸盐岩
Mishrif组
伊拉克
water injection development
controlling factors
micro-fracture
carbonate reservoir
Mi-shrif Formation
Iraq
