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| Oil and gas reservoir attribute discrimination based on surface sediment acid-extraction hydrocarbon in the western depression of Taiwan Strait Basin |
Jing ZHAO1,2, Qian-Yong LIANG1,2( ), Li ZHANG1,2, Guang-Jian ZHONG1,2 |
1. Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 510760, China
2. Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou 510760, China |
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Abstract Taiwan Strait basin is commonly regarded as a good petroleum-bearing area. However, the previous studies were all focused on the data from geophysics, with no direct evidence from petroleum geochemistry to prove the existence of economic oil or gas reservoirs in these areas with good petroleum prospects. In this study, the concentrations and carbon isotope ratios of the soil acid-extraction hydrocarbon from the sea surface sediments in Jinjiang depression and Jiulongjiang depression of west Taiwan Strait basin were analyzed to study the microseepage and origins of the petroleum-baring system, with the purpose of providing the proven geochemical information for petroleum exploration. The result of surface geochemical exploration for oil and gas in the west Taiwan Strait basin indicates that there exist two kinds of hydrocarbon resources: one is oil-gas and the other is single dry gas, probably related to two suites of source rocks in this area. These two kinds of resources make different contributions to the two depressions in the study area, where hydrocarbon of the Jiulongjiang depression is mainly from source 1, and source 2 mainly contributes to the hydrocarbon reservoir of Jinjiang depression.
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Received: 19 June 2017
Published: 04 June 2018
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| 研究区 | CH4含量/(μL/kg) | C1~C5总含量/(μL/kg) | CH4含量比例/% | 湿气站位比例/% | | 九龙江凹陷 | 1.5~159.7 | 1.5~269.4 | 55.0~100 | 37.78 | | 晋江凹陷 | 5.7~258.0 | 5.8~264.0 | 92.2~99.4 | 29.90 | | 总区域 | 1.5~258.0 | 1.5~269.4 | 55.0~100 | 28.75 |
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