渤中F油田气测录井中气油界面的识别方法  

Gas logging method for identifying gas-oil interface in BZ F oilfield

作　　者：李战奎[1] 罗鹏[1] 苑仁国 王建立 刘晓亮[1] 

机构地区：[1]中海油能源发展股份有限公司工程技术分公司 [2]中海石油(中国)有限公司天津分公司

出　　处：《录井工程》2015年第3期70-74,107,共5页Mud Logging Engineering

摘　　要：渤海油田渤中F油田众多目的层为含气顶油层,水平井开发要求避开气层在油层中着陆,因而气油界面的准确识别是水平井开发成功的关键。目前,钻井过程中能够准确识别气油界面的方法为测井中子-密度曲线法,然而由于随钻带中子-密度源作业风险高,在着陆过程中只进行电阻率-伽马曲线测量作业,无法准确识别气油界面。为了解决该问题,分别分析了皮克斯勒烃比值图板法和三角形图板法判断油气层的不同特征,指出烃比值图板法以分布于C1/C2值图板上的区间为主进行油气层的识别,而三角形图板法除利用C1/C2值识别油气层外,更重要的是针对含气顶油层利用其内三角形为"小正三角形"图形来反映"油层含溶解气"特征,即气油界面标志,从而在判断油气层的同时,实现气油界面的准确识别。渤中F油田4口井的实际应用表明,该方法对气油界面识别的准确率达到了100%。In BZ F oilfield of Bohai Oilfield,many target zones are reservoirs with gas cap.The horizontal well development requires avoiding gas layers and landing in oil layers,thus accurately identifying gas-oil interface is the key to the successful development of horizontal wells.Currently,the method that can accurately identify gas-oil interface during drilling is logging neutron-density curve,however,due to high risk of drilling with neutron-density source,resistivity –gamma curve measurement was only carried during landing,it was unable to identify gas-oil interface accurately.To solve this problem,the authors analyzed the different features of determining oil and gas layers with Pixler hydrocarbon ratio chart method and triangle method,pointed out that Pixler hydrocarbon ratio chart method mainly identified oil and gas layers with C1/C2 distribution interval on Pixler hydrocarbon ratio chart,in addition to using C1/C2 value to identify oil and gas layers,more importantly,triangle method is aimed at oil layers with gas cap to use the small equilateral triangles of their small inner triangles to reflect the feature that oil layers contain the dissolved gas,i.e.the identifier of gas-oil interface.Gas-oil interface is realized accurate identification,at the same time oil and gas layers are judged.The practical application of 4wells in BZ F oilfield showed that the accuracy rate of the method on gas-oil interface recognition reached 100%.

关 键 词：气测录井 图板法 气油界面 识别 水平井 

分 类 号：TE132.1[石油与天然气工程—油气勘探]