鄂尔多斯盆地低电阻率油层录井识别方法  

Mud logging methods in the identification of low resistivity oil layers in Ordos Basin

作　　者：赵宏波[1] 满百胜[2] 陈堂所[3] 

机构地区：[1]长庆油田分公司第五采油厂 [2]长庆油田分公司勘探部 [3]长庆油田分公司第一采油厂

出　　处：《录井工程》2012年第2期14-18,90,共5页Mud Logging Engineering

摘　　要：鄂尔多斯盆地低电阻率油层发育,常规测井、录井难以识别而导致该类油层漏失,这是长庆油田勘探开发的难点之一,而地层束缚水含量高是引起该盆地油层电阻率低的主要原因。通过多年的实践,总结出了多种评价低电阻率油层的录井方法,分别为:利用全烃、重烃、湿度比、平衡比和C3/C1的曲线组合特征评价油层的气测录井方法,利用含油气总量与孔隙度交会图板确定地层的含油性、利用轻重烃比与含油气总量交会图板评价油层的岩石热解录井方法,利用总环烷烃含量、降解指数(nC7/MCYC6)、水溶指数(Bz/CYC6)、总环烷烃含量与降解指数交会图板和水溶指数与降解指数交会图板评价油层的轻烃录井方法,用t2谱图定性识别储集层流体性质和用M-交会图板对储集层含油性进行精确解释评价的核磁共振录井方法。实际应用表明,这些录井方法在鄂尔多斯盆地低电阻率油层解释评价中取得了较好的效果,对其他地区低电阻率油层评价具有参考作用。The low resistivity oil layers in Ordos Basin are well developed,it is very difficult to use traditional well logging and mud logging techniques to identify them,which leads to the loss of this kind of reservoir,it is one of the difficulties for the exploration and development of Changqing Oilfield,that the content of strata bound water is high is the main reason for the low resistivity of the oil layers in Ordos Basin.Through years of practice,the authors summed up a variety of mud logging evaluation methods for low resistivity oil layers,among them are gas logging method which uses the combination characteristics of total hydrocarbon,heavy hydrocarbon,humidity ratio,balance ratio and the curve of C3/C1 to evaluate oil layers,rock pyrolysis logging method which uses total oil and gas bearing content versus porosity cross-plot to determine the formation oiliness and uses the ratio of light to heavy hydrocarbon and total oil and gas bearing content cross-plot to evaluate oil layers,the light hydrocarbon logging method which uses total naphthenic hydrocarbon,degradation index (nC7/MCYC6),water-soluble index(Bz/CYC6),total naphthenic hydrocarbon versus degradation index cross-plot and degradation index versus water-soluble index to evaluate oil layers,and nuclear magnetic resonance logging method which uses t2 spectrum to qualitatively identify fluid properties of the reservoirs and M-φ cross-plot to accurately interpret and evaluate the reservoir oiliness.The practical application shows that these mud logging methods have got good results in the interpretation and evaluation of low resistivity oil layers in Ordos Basin;they can be used for reference by the low resistivity oil layers evaluation in the other regions.

关 键 词：低电阻率油层 气测 岩石热解 轻烃分析 核磁共振 解释评价 

分 类 号：TE132.14[石油与天然气工程—油气勘探]