The lithology of reservoirs in block Niudong in Santanghu of Tuha oilfield is igneous rock,with extremely low permeability.

The reservoir of Carboniferous Kalagang formation in block Niudong of Santanghu basin is a fracture-porosity volcanic reservoir firstly found by Tuha oilfield,with the characteristics of obvious variation and dramatic decline in production as well as unstable producing situation.

FMI Image Logging Technology in Santanghu Basin;

Volcanics in Santanghu basin stretches widely with large thickness, where several layers with oil gas indication have occurrence of oil patch or oil trace.

The paper discussod the relation between formation deflecting force,drilling parameter and drill string assembly and well hole quality in theory and in the light of Santanghu drilling situation analysed the features of formation deflecting mechanics,the drill string assembly and chart of drilling parameter optimization have been made.

Reservoir Characteristics and Fracture Distributing Laws of Lucaogou Formation in Malang Sag of Santanghu Basin;

Property of the crude oil in Niujuanhu Oilfield of Santanghu Basin and its control factors;

Tectonic features and prospecting for oil and gas in the south of the center geotectogence in Santanghu Basin;

Flow unit classification and microscopic percolation feature of Toutunhe Formation reservoir in Santanghu Oilfield

Low-permeability reservoir evaluation for Niuquanhu Area of Santanghu Oilfield

In order to effectively solve severe circulation loss in block Niudong in Santanghu oilfield,strengthen reservoir protection during drilling,increase production of individual well,under balance drilling technology during the process of filling nitrogen was used in the research of the region.