Multivariate Statistical Analysis Reveals the Heterogeneity of Lacustrine Tight Oil Accumulation in the Middle Permian Jimusar Sag, Junggar Basin, NW China

Figure 3

Generalized stratigraphy of the Jimusar sag and the lithology, porosity, and distribution of the two porous and permeable subsections (i.e., sweet spots), based on the representative Well Ji 174. CALI: caliper; GR: gamma ray; SP: spontaneous potential; DEN: density; AC: interval transit time; RT: formation resistivity; RI: resistivity of the intrusion zone; P₂l₁²: lower part of the lower Lucaogou Formation; P₂l₁¹: upper part of the lower Lucaogou Formation; P₂l₂²: lower part of the upper Lucaogou Formation; P₂l₂¹: upper part of the upper Lucaogou Formation.