Geochemical Characteristics and Research Significance of Source Rocks of Yixian Formation, Northern Naiman

doi:10.3969/j.issn.1006-6535.2022.01.005

Abstract

Abstract: In view of the problems of unclear stratigraphic attribution and unclear geochemical characteristics of the set of gypsum salt rocks and thick mudstones in northern Naiman Sag, the stratigraphic characteristics of gypsum salt rock and thick mudstone and the characteristics of mudstone source rock were studied by means of paleontological sporopollen fossil identification, stratigraphic logging and seismic characteristics comparison, saturated hydrocarbon chromatography-mass spectrometry and so on. The research results show that the gypsum salt rock and mudstone were the sedimentary products of Yixian Formation in volcanic eruption period, with mudstone thickness of 50 to 400 m, distribution area of about 130 km², 3.40% average organic carbon content, Type I and Ⅱ₁ organic matters, and the average measured Ro value of 0.5% at about 1 880 m, indicating that they were in low-mature to mature evolution stage. The hydrocarbon generation and expulsion period of the source rocks in Yixian Formation was earlier than that of the source rocks in Jiufotang Formation, which is more conducive to hydrocarbon migration and accumulation. This study proves that Yixian Formation has well developed for hydrocarbon generation, which is of great significance for deep oil and gas exploration in the northern Naiman Sag.

Key words: source rock characteristics, stratigraphic characteristics, biomarkers, sporopollen fossils, Yixian Formation, Naiman Sag

CLC Number:

TE122.2

Liu Haiyan, Pei Jiaxue, Yang Xue, He Shaoyong, Liu Xiaoli, Cui Yujing, Hao Liang. Geochemical Characteristics and Research Significance of Source Rocks of Yixian Formation, Northern Naiman[J]. Special Oil & Gas Reservoirs, 2022, 29(1): 31-37.

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