Determination and its significance of ancient oil pools in Ordovician weathering crust,Ordos basin;

Character and distribution about the reservoir and permeable body in Ordovician weathering crust in Tabmiao of north Ordos basin,China;

Study of Ordovician weathering crust karst reservoirs in Ordos Basin;

This is one of the most important factors that limit the achievements of gas exploration in the Ordovician weathered crust of the Tabamiao region in Ordos Bas.

It shows the geological and geochemical characteristics of a REE deposit in granitic weathered crust in the eastern part of Guangdong Province.

The carbonatite reservoir of Ordovician weathered crust in Shanganning Basin belongs to palaeokarst and its main reservoir spaces are denudation vugs.

The distribution of Caledonian residuum reservoirs in the south of Ordos Basin is mainly controlled by karst palaeogeomorphology,strata of residuum and sedimentary facies.

The main re-(servoir) types in Ordovician include sub-salt reservoirs in the eastern depression,residuum karst reservoir on the slope zone of the palaeohigh,dolomite reservoirs in the 4th member of M.

The fourth paleosol (S4) which had changed into a residuum of the Brunhes Epoch (780,000 yr BP) at Shuangzhu in Chang an, Koujiapo in Xi an, Tianjiapo in Lantian and Hejiacun in Baoji developed over about 40 ka years.

Geological Exploration show that there is no relation between the placer gold deposit and endogenetic minerialization, The placer gold have a close relation with crust of weathering in this area.

As comparied with Renqiu buried hills and palaeocrust of weathering in the Ordos Basin,the authors point out that the key factors of controlling the Lower Paleozoic reservoir in the area are diagegtic evolution,sedimentary facies and structural stress.

Discovery of the large-scale paleo-weathering crust in the Qiangtang basin,northern Tibet, China and its significance

000 m,the ancient weathering crust was separately drilled through.