Geological Features and Reservoiring Mode of Shale Gas Reservoirs in Longmaxi Formation of the Jiaoshiba Area

This study is based on the sedimentation conditions, organic geochemistry, storage spaces, physical properties, lithology and gas content of the shale gas reservoirs in Longmaxi Formation of the Jiaoshiba area and the gas accumulation mode is summarized and then compared with that in northern America. The shale gas reservoirs in the Longmaxi Formation in Jiaoshiba have good geological conditions, great thickness of quality shales, high organic content, high gas content, good physical properties, suitable depth, good preservation conditions and good reservoir types. The quality shales at the bottom of the deep shelf are the main target interval for shale gas exploration and development. Shale gas in the Longmaxi Formation has undergone three main reservoiring stages：the early stage of hydrocarbon generation and compaction when shale gas reservoirs were first formed; the middle stage of deep burial and large-scale hydrocarbon generation, which caused the enrichment of reservoirs with shale gas; the late stage of uplift, erosion and fracture development when shale gas reservoirs were finally formed.

Ore-controlling Regularities of Thrust-fold structures and features of Tectono-geochemical Anomalies at the Xiaozhuqing Exploration Area in the Huize Zn-Pb District

1 Introduction The huize Zn-Pb ore district in Yunnan province is locatedinthecentralsouthernofthe Sichuan—Yunnan—GuizhouPb-ZnPoly-metallic Mineralization Area in the southwestern margin of the Yangtze Block,and is strictly controlled by fault structures.It has developed to one of the famous production bases of lead&zinc and germanium in China.

On the Socio-Economic Development Features on the Fringe Areas of Large Cities in China

Regional studies are basically carried out in three areas. Studies on regional develop-ment theory, the characteristics and state of regional development, and on decision mak-ing and policy, In recent years, regional development theories were introduced to China,such as growth pole theory, gradient theory, and central place theory, etc. Much benefi-cial work has been done concerning these theories. Much exploration has also been madeon decision-making and policy studies in connection with regional, territorial and cityplanning. However, not much has been done with regard to the research on the character-istics and state of regional development and most of them are descriptive. Therefore, thereis a lack of guiding theory for decision-making and policy studies and also a lack of re-search, on regional characteristics and state, which has inevitably resulted in erroneousdecision-making and reform measures. The stepping up of research on the charecteristicsand state plays a key role in raising, the regional scientific research level. In this article, theauthors concentrate their research on the city fringe areas and try to explore thesocio-economic features and state of these particular areas.