高含水油藏储层黏土矿物含量变化特征及其对开发的影响  

Variation characteristics of clay mineral content in high water-cut reservoirs and its influence on development

作　　者：廖顺舟[1] LIAO Shunzhou(Exploration and Development Research Institute ofHuadong Oilfield,SIN OPEC,Yangzhou 2250011 China)

机构地区：[1]中国石化华东油气分公司研究院实验中心,江苏扬州225007

出　　处：《复杂油气藏》2021年第2期85-89,共5页Complex Hydrocarbon Reservoirs

摘　　要：化验数据分析表明,高邮凹陷高含水油藏储层黏土矿物含量差距较大,并且各类黏土矿物的相对含量也有巨大差异,认为形成该差异的主要原因为沉积环境和成岩作用。通过油藏开发初期取心井黏土矿物化验数据与近期密闭取心井数据对比发现,储层物性条件的好坏控制了长期注水后黏土矿物的变化程度,储层孔喉大小是控制各类黏土矿物相对含量差异的主要因素。通过水驱油实验分析,由于黏土矿物在储层中被冲蚀程度存在差异等原因,物性越好的储层注水后渗透率增加幅度越大,且当初始渗透率小于(380~420)×10^(-3)μm^(2)时,渗透率随注水增加而减小。黏土矿物变化规律研究为长期注水后储层的物性变化提供了理论依据,为剩余油的研究提供了可变地质模型。The analysis of laboratory data shows that the content of clay minerals in high-water-bearing reservoirs in the Gaoyou Sag is quite different,and the relative content of various clay minerals also differs greatly.It is believed that the main reasons for this difference are the sedimentary environment and diagenesis.In the comparison of clay mineral test data from coring wells in the early stage of reservoir development with the recent data of closed coring wells,it is found that the physical condition of the reservoir controls the degree of change of clay minerals after long-term water injection,and the size of the pore throat of the reservoir controls various types of clay.Through water drive experiment analysis,due to differences in the degree of erosion of clay minerals in the reservoir and other reasons,the better the physical properties of the reservoir after water injection,the greater the increase in permeability,and when the initial permeability is less than(380~420)×10^(-3)μm^(2),the permeability decreases with the increase of water injection.The research of clay mineral change law provides a theoretical basis for the change of reservoir physical properties after long-term water injection and a variable geological model for the study of remaining oil.

关 键 词：黏土矿物 密闭取心 注水开发 高含水油藏 水驱油实验 

分 类 号：TE327[石油与天然气工程—油气田开发工程]