Geochemical Characteristics of Natural Gas and Its Origin in Changling Fault Depression of Songliao Basin, Northeastern China
Received date: 2009-06-29
Revised date: 2009-11-03
Online published: 2010-04-10
The industrial gas flow with high production or gas show in the lower Crataceous Yingcheng Formation and Denglouku Formation of Changling fault depression was gotten, with favorable combination of source-reservoir-cap, suggesting good exploration prospect. Based on chemical and carbon isotopic compositions of natural gas from Changling fault depression, the genetic types of natural gas was discussed, in combination with standard of gas classification and empirical pattern. Based on geologic background and geochemistry of source rock, the gas source correction was also discussed, in comparison with origin of natural gas from Xujiaweizi fault depression. In natural gas from Changling fault depression, CH4 is dominant gas, with low content of heavy alkane gas and dryness coefficient more than 0.95, suggesting high\|over mature stage of thermal maturity.Hydrocarbon gas is enriched in 13C, with reversal trend of stable carbon isotope of alkane gases with carbon number. Non\|hydrocarbon gas is CO2 and N2, but chemical composition of natural gas is distinct at different structural belts. Alkane gas is of thermally decomposed gas origin source from humic kerogen, but CO2 was sourced from inorganic gas. Alkane gas was mainly sourced from Shahezi formation humic source rock, then from Yingcheng Formation, a little contribution of gas from Huoshiling Formation or underneath would exist.
ZAN Ling, ZHANG Zhi-Huan, HUANG Jun-Ping, HE Xin, FENG Ru-Jin, WU Yu-Yuan, FEI . Geochemical Characteristics of Natural Gas and Its Origin in Changling Fault Depression of Songliao Basin, Northeastern China[J]. Natural Gas Geoscience, 2010 , 21(2) : 331 -337 . DOI: 10.11764/j.issn.1672-1926.2010.02.331
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