The flow of oil in geological history is an important information for oil exploration, but it has also been a problem that has plagued petroleum geologists.
“In the past, people have been trying to directly reflect the flow of oil by looking for some stable polar compounds such as carbazole nitrogen compounds in oil. But this empirical indicator does not correctly reflect the flow direction and mileage of oil because Any compound in petroleum will inherit its maternal characteristics more or less, and will also be affected by biodegradation," said Zhang Liuping, author of the Chinese Academy of Sciences Institute of Geology and Geophysics, in an interview with the Journal of Chinese Academy of Sciences.
In order to eliminate the influence of the above factors, the researchers re-diluted the information of the compounds concentrated by biodegradation, and based on the principle of material balance and adsorption theory in the process of oil flow, “reconverted to buildâ€, abandoned the original single Based on the empirical method of finding compounds to judge the oil flow situation, a new molecular index that eliminates the influence of maternal source and reflects only the oil flow situation, the secondary transport fractionation index and its calculation method are established.
The study found that the content of trace polar compounds can be linearly related to maturity of maternal source, and exponentially decays with the flow range of petroleum.
The application results of new indicators and methods in the Ordos Basin of China and the Western Canada Basin show that the index is consistent with the measured data, and also proves the principle of differential accumulation of oil and gas enrichment zones in the theory of hydrocarbon accumulation and reveals the southwestern Ordos Basin. The distribution of oil and gas in the eastern part of the eastern part of the country provides an important basis.
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