Figure 1

(a) Map of the People’ Republic of China and location of the PRMB14. (b) Structural map of the PRMB, showing different sub-structural units in the basin14. As shown in the figure, the PRMB is a complicated structural unit including multiple depressions and sub-basins as prospective accumulative space for hydrocarbon. (c) Three-dimensional fence diagram of the studied strata. “A” refers to a structural low, “B” refers to a structural high. K22A, K22B and K22C are three subdivided layers from K22 layer. The red arrows refer to the structural high, the black arrow refers to the structural low. Figure (a,b) are modified from Liu et al.14.