摘要
火山岩储层中普遍存在的蚀变现象使其测井评价变得复杂且困难。通过对南堡地区火山岩层段测井曲线特征分析,建立适用于研究区火山岩岩性的识别图版,选取对蚀变作用敏感的深侧向电阻率、声波时差、中子以及密度曲线,定义蚀变指数Is。利用地层元素测井所得数据分别与岩心黏土含量作交会图,选取与蚀变相关性更高的铝、铁、钆、硅这4种元素定义蚀变指数Ie。用这2种蚀变指数评价研究区火山岩储层的蚀变程度,评价结果与岩心数据吻合度较高。基于研究区蚀变火山岩储层设计岩石体积模型,求取蚀变黏土含量和孔隙度,并用Simandoux公式计算储层饱和度,结果与实际试油结论相符。
The widespread alteration phenomenon in volcanic reservoir makes the log evaluation complex and difficult.In this study,based on the analysis of log characteristics of volcanic strata in Nanpu area,we establish a lithologic identification chart suitable for the study area and select four curves to define the alteration index,deep lateral resistivity(RLLd),acoustic transit time(AC),neutron(CNL)and density(DEN),which are sensitive to alteration.Then,we use the data from the formation element capture spectroscopy logging(ECS)to make crossplot with the clay content of the core and select four elements to define the alteration index,Aluminum(Al),Iron(Fe),Gadolinium(Gd),Silicon(Si),which are more relevant to clay.The two alteration indexes are used to evaluate the alteration degree of volcanic reservoirs in the study area,and the evaluation results are in good agreement with the core data.Finally,we design a rock volume model of altered volcanic reservoir in the study area to calculate the altered clay content and porosity.We use simandoux formula to calculate the reservoir saturation.The result is consistent with the actual oil test conclusion.
作者
王欣茹
闫顶点
潘保芝
司兆伟
林发武
刘得芳
WANG Xinru;YAN Dingdian;PAN Baozhi;SI Zhaowei;LIN Fawu;LIU Defang(College of Geo-exploration Science and Technology, Jilin University, Changchun 130026, China;Research Institute of Exploration and Development, Petrochina Jidong Oilfield Company, Tangshan Hebei 063000, China)
出处
《测井技术》
CAS
2021年第1期68-73,共6页
Well Logging Technology
关键词
火山岩油气藏
测井响应特征
蚀变指数
蚀变程度
体积模型
南堡地区
volcanic reservoir
logging response characteristics
alteration index
alteration degree
volume model
Nanpu area
