基于恒速压汞和核磁共振测井的低孔低渗储层变胶结指数确定方法  

Determination of Variable Cementation Index of Low-porosity and Low-permeability Reservoir Based on Constant Velocity Mercury Injection and Nuclear Magnetic Resonance Logging

作　　者：张建升 许赛男 齐奕 时新磊 ZHANG Jiansheng;XU Sainan;QI Yi;SHI Xinlei(Tianjin Branch,CNOOC(China)Ltd.,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《西安石油大学学报（自然科学版）》2022年第3期44-48,57,共6页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：中海石油(中国)有限公司综合科研项目“中国近海低孔低渗油气田勘探开发关键技术与实践”(CNOOC KJ 125 ZDXM 07 LTD 01)部分研究成果。

摘　　要：针对低孔低渗储层中胶结指数变化导致储层含油气性难以准确评价的问题,提出了基于孔隙结构的孔隙-喉道单元组合导电模型,综合考虑孔隙和喉道对岩石电性的不同影响。模型显示,在低孔低渗储层中,胶结指数是一个受控于喉道半径、孔隙度和渗透率的参数。利用恒速压汞和核磁共振测井资料,获得不同深度地层的喉道半径,结合核磁孔隙度和渗透率数据,计算出连续的胶结指数m。结果表明,利用恒速压汞和核磁共振资料可以计算出低孔低渗储层的m值,提高了该类储层含油饱和度的计算精度。The change of cementation index in low porosity and low permeability reservoir makes it difficult to accurately evaluate the oil and gas bearing property of the reservoir.To solve this problem,a pore-throat combination conductivity model based on pore structure is proposed,which comprehensively considers the influence of pore and throat on electrical properties of rock.The model shows that in low porosity and low permeability reservoirs,the cementation index is a parameter controlled by throat radius,porosity and permeability.Using constant velocity mercury injection and nuclear magnetic resonance logging data,the throat radius of formation at different depth is obtained.Combined with nuclear magnetic porosity and permeability data,the continuous cementation index m is calculated.The calculation results show that the m value of low porosity and low permeability reservoir can be calculated by using constant velocity mercury injection and nuclear magnetic resonance data,which improves the calculation accuracy of oil saturation of this kind of reservoir.

关 键 词：变胶结指数 恒速压汞 核磁共振 孔隙结构 喉道半径 低孔低渗储层 

分 类 号：TE122.35[石油与天然气工程—油气勘探]