Abstract
ABSTRACT Due to reasons of tectonic activities, abnormal maturity characteristics of source rocks products, more attention needs to be paid to the problem of the hydrocarbon charging process. This study mainly focuses on indicating the geochemical characteristics and the origin of oil and gas, inverting an unconventional hydrocarbon accumulation mechanism. Then, the reason for the abnormal maturity of natural gas is explained. Several experiments such as rock pyrolysis and stable carbon isotope determination have been completed. It is confirmed that the natural gas of well DN7 is the product of Carboniferous. The high maturity of natural gas is caused by the periodic charging process.
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