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Application of Fluid Inclusions in the Study of Natural Gas Geology in Ordos Basin

Journal of China University of Mining and Technology 2006年第4期16卷 443-447页

作者： FAN Ai-ping YANG Ren-chao FENG Qiao LIU Yi-qun HAN Zuo-zhen Department of Geology Northwest University Xi ＇an Shanxi 710069 China Department of Earth Science and Engineering Shandong University of Science and Technology Qingdao Shandong 266510 China

The new recently demonstrated reserves of oil and gas in the Ordos basin are found at the top of petroliferous basins in China. Gas pools discovered in recent years in the permian system have become the main natural gas resource in the basin. Therefore, synthetic research on fluid inclusions should be done in order to ascertain the pool-forming stage, the maturity of organic matters and the properties of Paleo-fluids. The main types of fluid inclusions in the permian system in the basin include brine inclusions, carbon dioxide inclusions and organic inclusions. Homogenization temperatures （HT） of brine inclusions can be divided into four intervals： 66-83 ℃, 86-108 ℃, 112-138 ℃ and 142-153℃. The fluid inclusions in the interval of 112-138 ℃ are much more than that of other intervals, indicating that the second stage of hydrocarbon migration associated with the third temperature interval is the most important stage of gas pool formations. The fluid inclusion has extensive applications in the study of gas geology, not only in ascertaining the formation stage of gas pools, but also in estimating the maturity of organic matter and restoring Paleo-fluids. The result of testing the HT of brine inclusions shows that there are two stages of gas pool formations in the permian system occurring ＋150 Ma and ±100 Ma. The maturity of organic matter is moderate to high, a conclusion based on the color of fluid inclusions （radiated by fluorescence）. The high salinity of Paleo-fluids of the NaCI-H2O and CaCl2-H2O systems shows good preservation conditions of the Paleo-fluids. Two stages of reservoir filling, high maturity of organic matter and good preservation conditions are factors favorable for the formation and preservation of large-scale gas pools in the permian system in the Ordos basin.

关键词： Ordos basin permian system fluid inclusion homogenization temperature (HT) natural gas

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