图7. 荧光显微镜下有机质纹层分布特征
a—龙马溪组灰黑色含硅质泥岩,采样深度为3 084.09 m,测得电阻率为0.1 Ω·m,发亮的黏土矿物(沸石)含量较高,呈顺层节理,有机质纹层也较为明显;b—龙马溪组黑色页岩,采样深度为3 931.72 m,测得电阻率为10 Ω·m,由于有机质及黏土矿物分布较混乱,纹层断续分布;c—龙马溪组黑色页岩,采样深度为4 039.3 m,测得电阻率为15.42 Ω·m,有机质含量较低,纹层零散分布

Fig.7. Distribution characteristics of organic lamination under fluorescence microscope
a—a gray-black siliceous mudstone of the Longmaxi Formation with a sampling depth of 3 084.09 m, a resistivity of 0.1 Ω·m, a high content of bright clay minerals (zeolite), bedding joints, and obvious organic lamination; b—black shale of Longmaxi Formation with a sampling depth of 3 931.72 m and a measured resistivity of 10 Ω·m. Due to the disordered distribution of organic matter and clay minerals, the lamina is discontinuous; c—black shale of Longmaxi Formation with sampling depth of 4 039.3 m, measured resistivity of 15.42 Ω·m, low organic matter content and scattered laminae