The Dynamic Characteristics Of Natural Gas In Daqing Placanticline And The Multiplex Hydrocarbon-generating Mechanisms In The Deep Of Songliao Basin

In recent years, the hydrocarbon gas fields such as Wangjiatun, Shengping and Changde were discovered in Xujiaweizi Rift in Songliao Basin. In the main time, the geochemistry abnormities were also found in such hydrocarbon and non-hydrocarbon gas and caused many discussions about the origin of the gas fields. By the end of 2005, 1018×108m~3 deep natural gas was proved up in Daqing. The deep gas exploration was developed greatly.Most of natural gas was dissolved gas in the production in Daqing before. The accumulative total output reached 700×108m~3. In the course of the exploration and the development of dissolved gas, especially after 90s of last century, three main problems appeared:1. The non-hydrocarbon contents such as CO2 and H2S were rising rapidly;2. The gas-oil ratio of Lamadian, Sartu and Xingshugang region in Daqing placanticline rose up, the average gas-oil ratio reached 47.45M3/t,it was 61.8% higher than 1994;3. The gas cap in Lamadian is the only gas cap in Daqing placanticline, but Lamadian isn't the highest structure in placanticline. Many parameters in the north of the reservoir was higher than that of in the south such as original saturation pressure, original gas-oil ratio and the content of CH4.After the mid of the 90s, these differences between...