鄂尔多斯盆地延安组录井解释评价方法研究
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摘要
侏罗系延安组是鄂尔多斯盆地的重要含油层系,受地层水矿化度、原油气油比、储集层物性及埋深等的影响,存在大量的低电阻率油层、低气测全烃值异常油层和残余油层,给准确识别储集层流体性质带来了很大困难,以往的录井解释评价方法无法满足勘探开发的要求。总结多年现场解释评价经验,通过深入挖掘气测录井参数,发现气测参数C_3/C_2对于准确识别储集层含油性具有标志性作用,利用参数W_h与C_3/C_2建立气测解释图板,同时发挥地化录井技术准确辨识储集层原油特征的优势,利用参数P_s与S_1建立地化解释图板,将气测和地化两项录井技术组合应用并进行实地验证,有效解决了延安组储集层流体性质识别难题,使延安组录井解释符合率提高到83.3%,为后续的勘探开发提供了有力支持。
The Jurassic Yan′an formation is an important oil-bearing sequence in Ordos Basin.Due to the influence of salinity of formation water,gas-oil ratio of crude oil,reservoir physical properties and burial depth,a large number of low-resistivity oil layers,oil layers with abnormal total hydrocarbon value measured by gas logging and residual oil layers exist,which brings great difficulties to accurately identify reservoir fluid properties.The previous mud logging interpretation and evaluation methods can not meet the requirements of exploration and development.By summing up the experience of field interpretation and evaluation for many years,it is found that gas logging parameter C_3/C_2 plays a marked role in the accurate identification of reservoir oil-bearing probability by deeply mining gas logging parameters.The gas logging interpretation chart was established by using parameters W_h and C_3/C_2.At the same time,taking advantage of geochemical logging technology to accurately identify the characteristics of reservoir crude oil,the geochemical interpretation chart was established by using parameters P_s and S_1.Two mud logging technologies,gas logging and geochemical,were combined and verified on site,which effectively solved the problem of identification of reservoir fluid properties in Yan′an formation.The coincidence rate of mud logging interpretation in Yan′an formation is increased to 83.3%,which provides favorable support for the subsequent exploration and development.
The Jurassic Yan′an formation is an important oil-bearing sequence in Ordos Basin.Due to the influence of salinity of formation water,gas-oil ratio of crude oil,reservoir physical properties and burial depth,a large number of low-resistivity oil layers,oil layers with abnormal total hydrocarbon value measured by gas logging and residual oil layers exist,which brings great difficulties to accurately identify reservoir fluid properties.The previous mud logging interpretation and evaluation methods can not meet the requirements of exploration and development.By summing up the experience of field interpretation and evaluation for many years,it is found that gas logging parameter C_3/C_2 plays a marked role in the accurate identification of reservoir oil-bearing probability by deeply mining gas logging parameters.The gas logging interpretation chart was established by using parameters W_h and C_3/C_2.At the same time,taking advantage of geochemical logging technology to accurately identify the characteristics of reservoir crude oil,the geochemical interpretation chart was established by using parameters P_s and S_1.Two mud logging technologies,gas logging and geochemical,were combined and verified on site,which effectively solved the problem of identification of reservoir fluid properties in Yan′an formation.The coincidence rate of mud logging interpretation in Yan′an formation is increased to 83.3%,which provides favorable support for the subsequent exploration and development.
引文
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[4] 肖亮.低阻油层成因分析及测井识别方法[J].国外测井技术,2007,22(4):20-22.XIAO Liang.Genetic analysis of low resistivity oil layer and recognition method using well logging information[J].World Well Logging Technolgy,2007,22(4):20-22.
[5] 李玉桓,邬立言,黄九思.储油岩热解地球化学录井技术评价[M].北京:石油工业出版社,1993.LI Yuhuan,WU Liyan and HUANG Jiusi.Evaluation of pyrolysis geochemical logging technology for oil-saturated reservoir rocks[M].Beijing:Petroleum Industry Press,1993.
[6] 杨俊杰.鄂尔多斯盆地构造演化与油气分布规律[M].北京:石油工业出版社,2002:104-108.YANG Junjie.Tectonic evolution and oil-gas reservoirs distribution in Ordos Basin[M].Beijing:Petroleum Industry Press,2002:104-108.
[7] 何自新.鄂尔多斯盆地演化与油气[M].北京:石油工业出版社,2003.HE Zixin.Evolution and oil and gas in Oordos Basin[M].Beijing:Petroleum Industry Press,2003.