To realize the reservoir characterization of subtle oil/gas pool in continental sag basin, the Upper Paleozoic of Daniudi gas field was studied as a case by means of geological researches and geophysical prospecting and the geological researches were emphasized.

The Jurassic rocks in Qimugen-Sangzhuhe comprise Xilibili-Kuslapu fault basin and Damusi-Momoli- Keliyang depression basin separated by Qongkuoruolek anticline.

Discussion on the base level of reservoir-formation in continental downfaulted basin;

The effect of migration and distribu-tion rule of formation water on well logging inter-pretation in continental downfaulted basin.;

Sequence stratigraphy units at various levels are the results of tectonic movements at various levels and all correspond to petroleum geologic elements with different types at different ways in the continental downfaulted basin.

Distribution and controlling factors of hydrocarbon reservoirs in continental fault basins;

Based on the analysis of fluid pressure and fault characteristicsof continental fault basin,a precise model of abnormal pressure distributionin sagis made.

Control of facies-potential coupling on hydrocarbon accumulation in continental faulted basins and its basic geological models;