摘要
Y油田低电阻率油层测井、录井、岩心及试油等资料研究结果表明,其低电阻率油层成因主要是由于岩性较细、泥质含量较高,导致储集层的微孔隙发育从而导致束缚水饱和度较高,另外低孔、低渗以及盛水钻井液侵入也是重要原因。Y油田的低电阻率油层可分为以下类型:①低孔、低渗造成的;②微孔隙发育造成的;③咸水钻井液侵入造成的。通过对低电阻率油层形成机理的研究,提出了一种利用深探测电阻率和自然电位曲线自动识别低电阻率油层的RRSR法(水层的RRSR值为0,油层、低电阻率油层的RRSR值大于0)。该方法在Y油田的应用取得了满意的效果。
Mechanism for low resistivity oil pays (LRP) of Y Oilfield has been deeply studied by integrating data, including well logging, master log, core and DST results. The Y Field LRP is caused mainly by high irreducible water saturation in abundant micro-porosity system in fine to very fine grain sands and shale of reservoir. LRP types are as (1) caused by low porosity and permeability; (2) by abundant micro-porosity system; (3) by invasion of saline drilling filtrate into oil pays for the interval of bad borehole. RRSR identification is developed from mechanism of LRP and is equal to 0 for water zones, and RRSR is over 0 for LRP. It is confirmed by the practice cases in Y Oilfield.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2005年第1期60-62,共3页
Petroleum Exploration and Development
关键词
低电阻率油层
机理
微孔隙系统
测井响应特征
自动识别方法
low-resistivity oil pay, mechanism
micro-porosity system
well logging response
RRSR auto-identification
