黄骅坳陷石炭-二叠系凝析油气地球化学特征及来源分析

doi:10.13278/j.cnki.jjuese.20190267

Abstract

Abstract: Deep oil and gas exploration is an important replacement area for oil and gas resources in the future. Since the oil and gas exploration of the Lower Carboniferous-Permian coal-series source rocks in Bohai Bay basin has made new breakthroughs, it has become a research hotspot in the deep oil and gas field. The high-yield condensate gas flow has been obtained in the newly deployed Well QG8 and Well YG1 in the Dagang exploration area, and the source identification is the key to deep oil and gas exploration. The analysis result indicates that the condensate from well QG8 and Well YG1 is light oil with low viscosity and density. The condensate has high pristane (Pr/Ph>2.8),and the stable carbon isotope (δ¹³C) of n-alkanes and aromatic hydrocarbons of Well QG8 condensate is -29.1‰ and -26.8‰ respectively. The δ¹³C₁ of natural gas is heavier, ranging from -39.7‰ to -36.4‰ with drying coefficient more than 0.8,and the heavy hydrocarbon content is higher, up to 16.2%,belonging to wet gas prone to dry. It is found that the characteristics of condensate oil and gas of Well QG8 and Well YG1 are similar in stable carbon isotopes in extracts (saturated hydrocarbons δ¹³C=-29.26‰—-26.87‰, aromatic hydrocarbons δ¹³C=-26.62‰—-24.15‰, natural gas δ¹³C₁=-43‰—-35‰,and crude oil physical properties of density is 0.757 1-0.840 2 g/cm³), indicating that the condensate oil and gas come from the Carboniferous-Permian coaly source rocks. It is confirmed that the Carboniferous-Permian coaly source rocks in Bohai Bay basin have hydrocarbon generation potential and oil-gas exploration prospect.

Key words: condensate oil and gas, organic geochemistry, oil and gas source comparison, Carboniferous-Permian, Huanghua depression

CLC Number:

P618.13

Xu Jinjun, Li Ning, Jin Qiang, Liu Jihua, Lou Da, Teng Jiancheng. Geochemical Characteristics and Source Analysis of Carboniferous-Permian Condensate Oil and Gas in Huanghua Depression[J].Journal of Jilin University(Earth Science Edition), 2020, 50(2): 644-652.

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Geochemical Characteristics and Source Analysis of Carboniferous-Permian Condensate Oil and Gas in Huanghua Depression

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