Oil and Gas Exploration Prospects in Xiangfan-Zaoyang Sag of Nanxiang Basin

Xiangfan-Zaoyang sag lies on the south of Nanxiang basin.Compared with the northern small but prolific Nanyang and Biyang sags,the breakthrough of exploration activity is always obtained in this area.Through the research on the characteristics of Cenozoic Hetaoyuan group source rock and the hydrocarbon resource evaluation,we know that the source rock is immature,and the quantity of hydrocarbon generation and resources is very little,the total quantity of hydrocarbon generation is 2.97×10⁸t,the largest resources quantity is only 130×10⁴t.Moreover,the wells of aiming at Hetaoyuan group don't obtain the hydrocarbon accomplishment in Xiangfan-Zaoy ang sag.Therefore,Hetaoyuan group can't be taken as the exploration objective formation.Some salt wells provided a little information on Cretaceous source rock,and soil geochemistry exploration also showed that Cretaceous has exploration prospect.The exploration of carbonate and mantle derived gas is the fields of being concerned bothat home and abroad over along period of time,and some breakt hroughs have been made.Some soil geochemistry exploration information has revealed that there are some exploration prospects of carbonate and mantle derived gas.Then based on multidisciplinary analyzing research accomplishment of salt exploration and soil geochemistry exploration,Mesozoic Cretaceous,mantle derived gas and Sinian-Cambrian carbonate are the new horizon and fields of hydrocarbon exploration in Xiangfan-Zaoyang sag.