Origin and Source of Deep Natural Gas in Nanpu sag, Bohai Bay Basin, China |
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作者姓名: | ZHU Guangyou WANG Zhengjun WANG Yongjun ZHAO Jie DONG Yuexi WANG Kai LIU Yongchang and WANG Jianwei |
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作者单位: | 1 Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China. 2 PetroChina Jidong Oilfield, Tangshan 063004, Hebei, China |
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基金项目: | State Oil and Gas Special Project (2008ZX05004-003) and China Petroleum Technology Research Project (2008A-0609) co-funded. |
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摘 要: | Natural gas exploration in Nanpu sag, Bohai Bay Basin, has achieved breakthroughs in recent years, and a number of natural gas and condensate wells with high yield have been found in several structures in the beach area. Daily gas production of single wells is up to 170,000 m3, and high-yield wells are mainly distributed in?the Nanpu No. 1 structural belt.?Studies have shown that these natural gases are mainly hydrocarbon gases, with methane content about 80% to 90% and ethane 6%-9%, so they are mainly wet gas; and non-hydrocarbons are at a low level.?Carbon isotopes of methane range from -42‰ to -36‰, and ethane from -28‰ to -26‰. Calculated maturity based on the relationship between δ13C and Ro of natural gas, the gases are equivalent to those generated from organic matter when Ro is 1.0%-1.7% (mainly 1.25%-1.32%). The natural gas is oil-type gas generated from the source rocks at mature to high mature stage, associated with condensate, so carbon isotopes of the gases are heavier. Natural gas in the Nanpu No.1 structural belt is mainly associated gas with condensate. The analysis of the origin and source of natural gas and condensate, combined with the monomer hydrocarbon carbon isotopes and biomarker, indicated that the main source rocks in the Nanpu No.1 structural belt were Es3 (the lower member of the Shahejie Formation), followed by Es1 (the upper member of the Shahejie Formation).?The high-mature hydrocarbons from source rocks in the deep sag mainly migrated through deep inherited faults into shallow traps and accumulated to form oil and gas pools. Therefore, there is a great potential for exploring gas in deep layers.
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关 键 词: | Deep layer Natural gas Condensate Source rocks Shahejie Formation Nanpu sag Bohai Bay Basin |
收稿时间: | 2013/1/27 0:00:00 |
修稿时间: | 2013/4/18 0:00:00 |
Origin and Source of Deep Natural Gas in Nanpu sag,Bohai Bay Basin,China |
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Authors: | ZHU Guangyou WANG Zhengjun WANG Yongjun ZHAO Jie DONG Yuexia WANG Kai LIU Yongchang WANG Jianwei |
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Institution: | ZHU Guangyou1, WANG Zhengjun2, WANG Yongjun1, ZHAO Jie1, DONG Yuexia2, WANG Kai1, LIU Yongchang2 and WANG Jianwei2 1 Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China 2 PetroChina Jidong Oilfield, Tangshan 063004, Hebei, China |
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Abstract: | Natural gas exploration in Nanpu sag, Bohai Bay Basin, has achieved breakthroughs in recent years, and a number of natural gas and condensate wells with high yield have been found in several structures in the beach area. Daily gas production of single wells is up to 170,000 m3, and high‐yield wells are mainly distributed in the Nanpu No. 1 structural belt. Studies have shown that these natural gases are mainly hydrocarbon gases, with methane content about 80% to 90% and ethane 6%–9%, so they are mainly wet gas; and non‐hydrocarbons are at a low level. Carbon isotopes of methane range from ?42‰ to ?36‰, and ethane from ?28‰ to ?26‰. Calculated maturity based on the relationship between δ13C and R0 of natural gas, the gases are equivalent to those generated from organic matter when R0 is 1.0%–1.7% (mainly 1.25%–1.32%). The natural gas is oil‐type gas generated from the source rocks at mature to high mature stage, associated with condensate, so carbon isotopes of the gases are heavier. Natural gas in the Nanpu No.1 structural belt is mainly associated gas with condensate. The analysis of the origin and source of natural gas and condensate, combined with the monomer hydrocarbon carbon isotopes and biomarker, indicated that the main source rocks in the Nanpu No.1 structural belt were Es3 (the lower member of the Shahejie Formation), followed by Es1 (the upper member of the Shahejie Formation). The high‐mature hydrocarbons from source rocks in the deep sag mainly migrated through deep inherited faults into shallow traps and accumulated to form oil and gas pools. Therefore, there is a great potential for exploring gas in deep layers. |
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Keywords: | Deep layer Natural gas Condensate Source rocks Shahejie Formation Nanpu sag Bohai Bay Basin |
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