The results shows that the Mesozoic formations in this area have abundant gas source and are the potential targets for exploration in Tangyuan downchasm and that the central uplift within the downchasm and thrust anticlinal belt in West Slope are the favo.

Aimed at some technological questions caused in the drilling of complex strata in coal field, especially in cenozoic strata carried out discussion.

This paper discusses the Sr isotope data obtained from previous studies on the ore-host rocks (Taihua Group),the Wenvu granite and the fluid inclusions of gold-bearing quartz veins in the Xiaoqinling gold field as well as new Sr isotope data recently obtained by the authors for the Neo-Mesoproterozoic strata (Guandaokou and Luanchuan Groups).

According to the interpretation of seismic sections and the analysis of drilling and core data, four types of accommodation spaces are recognized in Mesozoic of Songliao Basin.

Yanqi Basin is located between Tarim Basin and Tuha Basin, and the attribution of its Mesozoic stratigraphy has been a long dispute.