风城油田重18井区侏罗系齐古组三段低阻成因研究

Origin of Low Resistivity Reservoirs of Jurassic Qigu Formation in Wellblock Zhong 18 of Fengcheng Oilfield

风城油田重18井区侏罗系齐古组三段(J3q3)油藏类型为单斜构造背景下的岩性油藏,油层具有低阻特性。通过地质背景与岩石物理特征的详细解剖,利用岩电关系分析技术,揭示了油层的低阻成因机制,认为泥质含量高及黏土矿物附加导电作用、泥质夹层干扰是造成J3q3油层低阻的最主要原因;导电重矿物大量富集在局部层段,对降低油层电阻率也有一定程度的影响。

The J3 q3reservoir of Jurassic Qigu Formation in Wellblock Zhong 18of Fengcheng Oilfield belonged to lithologic reservoir,which was formed on monoclinic structural background.The reservoir was low resistivity.The genetic mechanism of low resistivity reservoirs was revealed by litho-electric property relation and the analysis of geological background and rock physical characteristics.The results show that high muddy content and the additional conductivity of clay minerals,interference of muddy intercalation are the main reasons of the low resistivity of reservoirs.Moreover, a large number of conductive minerals in local reservoir would reduce the resistivity of the reservoirs at a certain extent.