Fig. 7

Lithology of Cretaceous rocks in the study area. (a) Hq21-q17 well, K1q2, 451.39 m, grey glutenite; (b) Hq21 well, K1q2, 458.08 m, grey oil-immersed fine conglomerate; (c) Hq21-q10 well, K1q2, 434.19 m, grey fine conglomerate; (d) Hq23-q1 well, K1h1, 313.44 m, grey fine sandstone; (e) Hq23-q50 well, K1h2, 237.03 m, grey siltstone and (f) Hq23-q49 well, K1h3, 168.67 m, argillaceous siltstone.