Kinetics of hydrocarbon generation for Well Yingnan 2 gas reservoir,Tarim Basin,China |
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| Authors: | ZhongYao Xiao XianMing Xiao DeMing Ma YuHong Lu ChaoShi Yang |
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| Institution: | 1.China University of Mining & Technology,Beijing,China;2.Research Institutes of Exploration and Development, Tarim Oilfield Company,PetroChina,Korla,China;3.Guangzhou Institutes of Geochemistry,Chinese Academy of Sciences,Guangzhou,China;4.Department of Synthetic Physical-Chemical Prospecting,BGP,Zhuozhou,China |
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| Abstract: | Well Yingnan 2, an important exploratory well in the east of Tarim Basin, yields high commercial oil and gas flow in Jurassic. Natural gas components and carbon isotopic composition indicate that it belongs to sapropel type gas. Because this region presents many suits of hydrocarbon source rocks, there are some controversies that natural gases were generated from kerogen gas or crude oil cracking gas at present. By using the kinetics of hydrocarbon generation and carbon isotope, natural gas of Well Yingnan 2 is composed mainly of crude oil cracking gas, about 72%, it is generated from secondary kerogen gas of Cambrian-Lower Ordovician source rock and crude oil cracking gas of Mid-Upper Ordovician oil reservoir. The main oil and gas filling time is 65 Ma later in the Jurassic gas reservoir of Well Yingnan 2, so the gas reservoir belongs to late accumulation and continuous filling type. |
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