Abstract:

In this paper，an analysis is made on the source rock features，source of hydrocarbons and gas pooling process in the Kelameili gas field of the Junggar Basin in Xinjiang. Using techniques such as source rock analysis，hydrocarbonˉsource correlation and comprehensive analysis of hydrocarbon pooling，we describe the main source rocks of the Kelameili gas field and preliminarily determine the gas accumulation process and its main controlling factors. According to the study，it is believed that:1）the main source rock of the Kelameili gas field is the Carˉboniferous source rock;2）hydrocarbons mainly accumulate in reservoirs near the source rocks and the pooling process is characterized by“early accumulation and late preservation”;3）multiˉstages of charging happened in the Late Hercynian，Late Indonisian and MiddleYanshanian;4）hydrocarbon pooling in different areas has a temporal sequence. The main controlling factors for gas pooling in the Kelameili gas field are the distribution of Carboniferous source rocks and volcanic rocks as well as the regional seals in the Permian Urho Formation.

Key words: volcanic rock, controlling factor, hydrocarbon pooling process, Kelameili gasfield, Junggar Basin