| 库车坳陷牙哈地区次生凝析气藏的成因差异 |
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| 引用本文： | 杨海军,吴楠,李勇,雷刚林,孙雄伟.库车坳陷牙哈地区次生凝析气藏的成因差异[J].地质科技通报,2015,34(4):144-148. |
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| 作者姓名： | 杨海军 吴楠 李勇 雷刚林 孙雄伟 |
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| 作者单位： | 1. 中国石油塔里木油田分公司勘探开发研究院, 新疆库尔勒 841000; |
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| 基金项目： | 教育部高校博士点新教师类基金项目(20124220120005)国家自然科学基金项目(41202112) |
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| 摘 要： | 牙哈地区位于塔里木盆地北部海相含油气系统与陆相含油气系统过渡带,多期油气充注过程导致区内凝析气藏广泛发育。地球化学研究表明,牙哈地区凝析油的折算Ro在0.7%附近(远低于原生凝析油Ro=1.3%的热力学门限),反映出次生凝析气藏的特征;同时,牙哈地区原油轻质组分相对损失的特征,表明其发育典型的相分馏效应,即相分馏作用控制了其凝析气藏的形成。流体相态特征表明,牙哈地区凝析气藏分为两类:一类为饱和型凝析气藏,此类凝析气藏的地露压差较小,具油环,主要分布于YH7井;另一类为不饱和凝析气藏,此类凝析气藏的地露压差较大,在地下为纯气态,不具油环,主要分布于YH3以及YH6井区。其成藏过程受控于差异充注过程,即早期少量原油仅对于YH1、YH5等井区发生了充注,原油充注并未达到YH3井区;晚期大量干气对YH1、YH7井区的油藏发生持续侵入,而承载了大量轻质组分的天然气运移至较浅的YH3井区发生聚集,由于温压降低,转变为不饱和凝析气藏。
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| 关 键 词： | 次生凝析气藏 相分馏作用 库车坳陷 牙哈地区 |
| 收稿时间： | 2014-05-11 |
Genetic Differences of the Subsequent Condensates in Yaha Area,Kuche Depression |
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| Institution: | 1. Research Institute of Exploration and Development, PetroChina Tarim Corporation, Korla Xinjiang 841000, China;2. School of Geosciences, Yangtze University, Wuhan 430100, China |
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| Abstract: | Yaha Oilfield is the most hydrocarbon province in Tarim Basin,which widely developed the condensates in the Triassic reservoir.Geochemical analysis illustrates that the condensate oil is low mature with Ronear 0.7%,which reflects the characteristic of the subsequent condensates.Moreover,the changing tendency of the light component describes a obvious figure of phase fractionation that controls the generation of the condensates.The phase characteristics of the condensates can be clarified into two types:first is the saturated condensates that have a small difference between the FMP and DPP,which mainly develop around the YH7 well;another is the unsaturated reservoir that have a large difference between the FMP and DPP,which develop in the YH3 well and YH6 well area.The generation of the secondary condensates is controlled by the multiple episode of the hydrocarbon charging.Slight amount of the oil charged the YH1 and YH5 well without YH3 well area in the early episode.Moreover,great quantity of dry gas invaded the YH1 well and YH7 well area,which turned YH3 well area into unsaturated condensate by both the change of temperature and pressure and the light component migrated by dry gas. |
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