The advances on exploring natural gas reservoir in the Silurian of the Well Mandong 1 in eastern Tarim Basin must be an important symbolic breakthrough on oil and gas exploration. Taking full advantages of the substantially existing geological and geochemical data, the paper analyzed the genesis of natural gas in the Silurian of the Well Mandong 1, dealing with the aspects of component characteristics, genetic-types of the gases, organic matters maturities and correlation of gas sources. It was the evidence that indicated the natural gas in the Well Mandong 1 derived from marine sapropel-type kerogen, possessed the compositional characteristics of oil-splited gas and originated from marine post-mature source rocks of the Cambrian-Lower Ordovician’s. A mass of nitrogen formed in the process of marine amino-clay minerals degradation and oxidization in the post-mature phase and resulted in a highly content of nitrogen in the gas pool of the Well Mandong 1. Based on studies of inclusion and burial history, it was thought that the pool-forming process of the gas pool in the Well Mandong 1 was complicated, with its major pool-forming period being the Yanshanian-Himalayan period. Combined with the fruits of the Well Yingnan 1, the exploration direction in the eastern part of the Tarim Basin was discussed.
Xiao Zhongyao,Lu Yuhong,Wu Yi et al. A PRELIMINARY STUDY ON NATURAL GAS GENESIS AND POOL-FORMING PERIOD IN THE SILURIAN OF WELL MANDONG 1, EAST TARIM BASIN[J]. Chinese Journal of Geology, 2005, (2): 262-273,283.