BASIC FORMING MODELS OF THE CENOZOIC BIOGAS POOLS IN CHINA

Under the control of geotectonic evolution zonality and paleogeographic and paleoclimatic zonality of the Cenozoic, five kinds of basic forming models of biogas pools were developed in the Cenozoic basins of China. The first pools are in salt lakes and inland salt lakes in the circumstances of highlands, high latitude, high elevation and cold and dry climate, which are located in large intermontane strike-slip compressional down-warped basins in the northwestern part of China. The second are in inland brackish water and fresh water lakes under humid tropic and subtropical zone climate, which are located in ultra small intermontane strike-slip extensional rift basins in the southwestern part of China. The third are the Quaternary biogas pools in plain, estuarine facies and large delta facies areas in the southeast coastal subtropical zones of China. The forth are mixed-genetic biogas pools in the eastern strike-slip extensional rift basins of China. The fifth are the Upper Tertiary-Quaternary biogas pools in the poor-trophic shallow littoral areas of tropic and subtropical zones, which are on the quasi-passive continental margins of the South China Sea.