塔里木盆地油气层低阻成因实验研究(I)

Experimental Study on the Gensis of Low Resistivity Pay Zone in North Region of Tarim Basin.

毛志强，龚富华，刘昌玉等．塔里木盆地油气层低阻成因实验研究（Ｉ）．测井技术，１９９９，２３（４）：２４３～２４５塔里木盆地塔北地区低阻油气层的测井解释问题一直未得到解决。从粘土矿物附加导电作用出发，通过岩石物理实验研究这一问题的物理机制，进而寻求解决这一问题的有效途径。给出了４种温度条件下，饱和不同矿化度（７种）盐溶液的７块岩样的电阻率实验关系。实验结果表明，含水岩石粘土附加电导主要受岩石阳离子交换量、溶液矿化度和温度３个因素控制；粘土附加导电是塔里木盆地塔北吉拉克和解放渠（Ｔ）等油田油气层低电阻率的主要原因。这一重要认识是对含高矿化度地层水储层粘土附加导电性可以忽略的传统片面认识的一次重大突破。该项研究成果给塔里木盆地低阻油气层的识别、评价提供了坚实的实验和理论基础。

This part of the paper presents the detailed data analysis of the experimental investigation on the genesis of low resistivity pay zone in northern region of Tarim Basin. A three point method is proposed to define the linear segment of C o- C w relation.The measurements show that both m and n  are independent of the additional conductivity of clays and the equivalent cation exchange capacity of oil bearing zone increases as brine saturation decreases, which agrees well with what Waxman et al.concluded in seventies. The equivalent conductance of the counterions as a function of brine resistivity and temperature is determined based on lab measurements of ten samples at the conditions of four temperatures and six solution salinities.The data analysis demonstrates that Waxman and Smits formula can be well used to describe the samples resistivity properties.Since the equivalent conductance of the counterions is different from that Waxman and Thomas presented,it is believed that the equivalent conductance of the counterions is not independent of reservoir. Subject Terms:Tarim basin resistivity clay mineral lab testing cation exchange capacity water saturation