Study on Hydrocarbon Source Rock of Late Paleozoic-early Cenozoic in the Southwestern Dongpu Sag

doi:10.11885/j.issn.1674-5086.2016.12.19.03

Abstract

Abstract: There are two main groups of hydrocarbon source rocks in southwest Dongpu Sag, the Carboniferous-Permian and the third member of Shahejie Formation. Their hydrocarbon generation capacity and their contribution to hydrocarbon accumulation affect the evaluation of the exploration strata and targets in this area, especially since there have been differing opinions regarding whether the third member of the Shahejie Formation can produce gas, and whether the gas reservoirs are mixed-source. By using geochemical methods, such as carbon isotopes, rare gas isotopes, natural gas compositions, and chromatography-mass spectrometry, oil and gas sources were compared and the geochemical characteristics of the source rocks were studied. The study shows that the organic matter in the source rocks of the third member of Shahejie Formation are dominated by Type Ⅱ₂ to Type Ⅲ Kerogen with high abundance and are poor-moderate grade source rocks, while the organic matter in the Carboniferous-Permian source rocks are dominated by Type Ⅲ Kerogen with high abundance and are good quality source rocks. The crude oil in the area comes from the third member of Shahejie Formation, where the source rocks are characterized by generating oil first and then entering a high-maturity stage to produce coal-type gas with heavy carbon isotopes. The Carboniferous-Permian source rocks mainly produce coal-formed gas. These two types of gas mix and become important natural gas sources in the area. The two groups of hydrocarbon source rocks are the most favorable exploration sources in this area.

Key words: Dongpu Sag, geochemistry, source rock, hydrocarbon accumulation, coal-type gas

CLC Number:

TE132

LIU Zhongliang, ZHANG Chengfu, LI Qingchen, LIU Jun, AN Hailing. Study on Hydrocarbon Source Rock of Late Paleozoic-early Cenozoic in the Southwestern Dongpu Sag[J]. 西南石油大学学报(自然科学版), 2018, 40(2): 35-45.

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