地化录井礁灰岩储层含水识别方法研究——以陆丰X-1油田为例  

Study on water bearing identification method of geochemical logging reef limestone reservoirs:Taking LF X⁃1 oilfield as an example

作　　者：高永明 何理鹏 周金堂 邓永辉 孙本飞 GAO Yongming;HE Lipeng;ZHOU Jintang;DENG Yonghui;SUN Benfei(CNOOC China Limited Shenzhen Company,Shenzhen,Guangdong 518000,China;Beijing Yongshengtong Technology Development Co.,Ltd.,Beijing 100102,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司 [2]北京永盛通科技发展有限公司

出　　处：《录井工程》2024年第2期115-124,共10页Mud Logging Engineering

摘　　要：陆丰X-1油田礁灰岩油藏整体是一个构造边水油藏,储层非均质性强,含油丰度和原油性质变化大,孔隙水类型复杂,低渗透储层含毛细管水,常规测井难以识别,但地化录井对于储层含油性、原油性质和含水响应特征十分敏感,故对该油田低电阻率和低气测显示的储层评价具有明显的技术优势。不同孔隙水类型储层地化录井响应既有共性,也有个性:共性是指储层含水后含油丰度降低,表现为含油气总量和色谱总烃面积减小,原油性质变差,表现为油产率指数下降;个性是指低渗透率储层含毛细管水,表现为Pr/Ph变大。常规储层含自由水,表现为Pr/nC_(17)和Ph/nC_(18)明显升高。利用地化亮点等地化录井特征参数对陆丰X-1油田6口开发井礁灰岩储层含水进行识别取得良好效果,储层解释符合率达90%以上。应用结果表明,地化录井在储层评价、储层含水识别、随钻地质导向等方面发挥了重要作用。The reef limestone reservoir in LF X⁃1 oilfield is a structural edge water reservoir as a whole,with strong reservoir heterogeneity,great changes in oil abundance and oil properties,complex pore water types,and low permeability reservoirs containing capillary water,which is difficult to identify by conventional well logging.However,geochemical logging is very sensitive to the reservoir oil saturation,oil properties and water⁃bearing response characteristics,so it has obvious technical advantages for evaluating reservoirs with low resistivity and low gas logging shows in this oilfield.The geochemical logging responses of reservoirs with different pore water types have both commonness and individuality.The commonness refers to the decrease of oil abundance after the reservoir contains water,which is manifested as the decrease of total hydrocarbon content and total hydrocarbon area of the chromatogram,and the deterioration of oil properties become poor,which are manifested as the decrease of oil yield index.Individuality means that the low permeability reservoirs contain capillary water,characterized by an increase in Pr/Ph.Conventional reservoir contains free water,which is manifested as a significant increase in Pr/nC_(17) and Ph/nC_(18).Good results have been obtained in water bearing identification of reef limestone reservoirs of 6 development wells in LF X⁃1 oilfield by using geochemical bright spots and other geochemical logging characteristic parameters,and the coincidence rate of reservoir interpretation is over 90%.The application results show that geochemical logging plays an important role in reservoir evaluation,water bearing identification and geosteering while drilling.

关 键 词：礁灰岩 地化录井 毛细管水 自由水 

分 类 号：TE132.1[石油与天然气工程—油气勘探]