Organic matter in the oil and the residues after M. A. B. (Methanol-Acetone-Benzene) extraction of source-rocks, which were collected by drilling production tests from various nonmarine depositional layers in Qianan and Nongan area belonging to Jilin oilfield, were analyzed by Curie-point pyrolysis gas chromatography (pyrolysis-GC), elemental analysis, and infrared spectroscopy (IR). Genetic source studies have been performed on the basis of the correlation between the distribution of pyrolysates from kerogen and oils collected in various areas and depositional formations.
The results in this study indicated oil-source rock correlations as follows:
Samples from Nongan area: The n-alkanes distribution patterns in pyrolysates of the oils produced in K
1q
4 formation were similar to those of the residues from the Jurassic K
1qn
1 source rocks. This fact indicates that K
1q
4 oils had been generated from the Jurassic source rocks. This result is consistent with the conclusion of previous studies.
Samples from Qianan area: Although previous works concluded that the K
1q
4 oils have genetic relationship whth K
1qn
1 formation source rocks, the n-alkanes distribution partterns in pyrolysates of K
1q
4 oil were quite different from those of the residues prepared from K
1qn
1 source rocks. This result suggests that K
1q
4 is not the source formation of the oils from K
1qn
1 and that another source formation forK
1q
4 reservoir exists.
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