Abstract: Low-degree investigation on forming conditions of Chang-6 reservoir of Panlong oilfield in Ordos basin results in unsatisfied result of petroleum exploration. Except for finding out Chang-6 reservoir in Shazegou area in southern Panlong oilfield, this reservoir has not been found in the middle and north parts of this oilfield, showing that the potentials of petroleum exploration of Chang-6 reservoir are still very big. Studies show that the forming conditions of Chang-6 reservoir are advantageous. This paper comprehensively and systematically analyzes and summarizes the exploration experiences of Chang-6 reservoir in Shazegou area, and suggests that to further study its lows of petroleum migration and accumulation, and increase the exploration efforts, the exploration of Chang-6 reservoir in the middle part of this oilfield will make progress soon.

Key words: north Shaanxi slope, Panlong oilfield, Chang-6 reservoir, hydrocarbon accumulation condition