Title: The difference in geochemical characteristics of natural gases between eastern and western parts in Hetianhe gas field of Tarim basin and its origin
Abstract: Based on the study of geochemical characteristics of natural gases of Hetianhe gas field in Tarim basin and in combination with the analysis of source rocks and geological conditions, it is concluded that the alkane gases in Hetianhe gas field is high maturing dry gases with high content of CO 2 and N 2. The gases are of oil type, which are generated from high over mature Cambrian source rock. Hetianhe gas field distributes mainly from east to west like a belt. The buried gas layer of the field's western part is shallower than that of eastern part. The geochemical characteristics of natural gases are different between the eastern and the western parts. Compared to the eastern part, the natural gases in the western part have more CO 2 content; and the dry coefficient is higher; Carbon isotope of methane is heavier. The reasons that cause the differences of geochemical characteristics of natural gases between the western and eastern parts in Hetianhe gas field are as follows: the gases migrated from east to west in the gas field and caused the different component of natural gas; the pressure became lower in western part of the field caused the dissolved CO 2 releasing from water, thus the CO 2 content became higher; methane could easily disperse through cap rocks in western part made the methane isotope became heavier.
Publication Year: 2002
Publication Date: 2002-01-01
Language: en
Type: article
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Cited By Count: 10
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