低电阻率油层成因机理分析及有利区预测  

Origin of low resistivity pays and forecasting of favorable prospecting areas

作　　者：杨春梅[1] 周灿灿[1] 程相志[2] 

机构地区：[1]中国石油勘探开发研究院 [2]中国石油大学(华东)

出　　处：《石油勘探与开发》2008年第5期600-605,共6页Petroleum Exploration and Development

基　　金：中国石油天然气股份有限公司“十一五”科技攻关项目(030169)

摘　　要：低电阻率油层的岩石物理成因较为复杂。通过对8个盆地中发育的54个典型低电阻率油层(藏)的系统研究,建立了低电阻率油层各种岩石物理成因与地质成因之间的关系。结合沉积环境、成岩作用、构造特征和成藏动力等综合分析低电阻率油层的发育特征,提出了5种具有典型意义的低电阻率油层有利勘探目标区带:①缓坡带低幅度构造岩性油藏发育区;②构造运动活跃区天然水淹、流体非均质现象严重的区带;③埋藏浅、岩性细、黏土矿物组合中蒙脱石含量高的区带;④弱水动力环境下砂泥岩薄互层发育区;⑤与火山碎屑沉积演化有关的黄铁矿等导电性矿物富集区。由于钻井泥浆与地层水性质不同等侵入原因造成的油、水层电性标准模糊则属于工程原因所导致的低电阻率。The relationship between petrophysical and geological genesis of low resistivity pays is established through the study of 54 low resistivity pays in 8 basins. Combining with the comprehensive analysis of sedimentary environment, diagenesis, tectonic evolution etc, this paper presents five types of typical low resistivity exploration targets, including low-relief lithologic-structural traps in the gentle-slope depositional system, natural water-flooding areas with fluid heterogeneity characteristics in relatively active tectonic movement zone, shallow layers with high content of montmorillonite among clay mineral and slowly depositional fine sandstone layers, weakly hydrodynamic thin multilateral sand and shale with resistivity anisotropy, and conductive mineral developed areas such as pyrite. Mud invasion in drilling is an engineering reason for some low electrical resistivity.

关 键 词：低电阻率油层 黏土附加导电性 低幅度构造 天然水淹 导电矿物 电性各向异性 流体非均质性 

分 类 号：P631.3[天文地球—地质矿产勘探]