鄂尔多斯盆地延长组低渗透油藏中微电极曲线的应用

本文针对微电极曲线在延长组低渗透油藏中正负差异共存的普遍现象,从微电极测量原理入手,结合其它测井曲线特征和孔隙结构差异,对微电极曲线的负差异现象进行解释,导致负差异的主要原因是储层的渗透性差、泥浆侵入非常弱以及没有形成泥饼等现象造成的。同时结合大量岩心化验分析资料和试油资料,将微电极正负差异现象应用于延长组低渗透油藏的渗透率确定、油水层的识别和划分有效储层、确定射孔井段的研究,取得良好的效果,明显地提高了测井解释精度。

The Application of Micro-Electrode Curves in the Low-permeability Reservoirs of Yanchang Group in Ordos Basin

Aiming at the common phenomenon of concomitant positive-negative difference in the low-permeability reservoir of Yanchang group,this paper introduces an interpretation method to the negative variance phenomenon of micro-electrode curves which is caused by poor perme- ability,poor mud invasion and no mud cake,etc.from the micro-electrode measuring principle and combination with other well logging characteristics and pore texture difference.At the same time combining with the analyzed core data and production test data,the phe- nomenon of positive-negative difference in microelectrode is applied to the research of permeability determination,discrimination of water and oil zones,division of effective reservoirs and determination of perforation interval,which has achieved favorable effect and improved the precision of well logging interpretation obviously.