库车坳陷阿瓦特地区油气动态演化过程

Dynamic hydrocarbon accumulation process in Awate District of Kuqa Depression

 吴海¹ 赵孟军¹ 李伟强² 白东来³ 周延钊⁴ 曾芳⁵

中国石油勘探开发研究院，北京100083 长江大学地球科学学院，湖北 武汉 430100 东北石油大学地球科学学院，黑龙江 大庆 163318 中国石油大学（华东）地球科学与技术学院，山东 青岛 266580 中国地质大学（北京）能源学院，北京 100083）

 阿瓦特地区为库车坳陷克拉苏构造带上的典型含气区域。基于储层定量颗粒荧光测试手段、流体包裹体分析技术及储层沥青特点，结合埋藏史及热史，对其油气动态演化过程进行分析。结果表明：阿瓦特地区定量颗粒荧光QGF指数普遍超过4，QGF光谱峰值集中在400 nm左右，油包裹体主要呈现蓝色荧光，结合均一温度及埋藏史认为，第1期成熟轻质油充注时期约为15.0 Ma；晚期天然气充注时间大致为2.5 Ma，黑色气包裹体记录了该期充注，天然气充注对早期油藏进行改造在储层中形成了残余沥青，不同层段含油性相差较大可能是由于储层物性差异造成的。

 Awate district is the typical gas bearing area in the Kelasu structural belt of Kuqa Depression. The dynamic hydrocarbon accumulation process was studied by the analysis of fluid inclusion, quantitative grain fluorescence and bitumen in the reservoir. It is believed that the Awate District has experienced two stages of hydrocarbon charge by combining the burial history with thermal evolution history. The results show that with the fluorescence color of fluid inclusion dominated by blue, QGF index of the quantitative grain fluorescence is larger than 4 in all the testing samples, and the QGF spectra peak wavelength concentrated on 400nm, the reservoir experienced the charge of light oil in the first stage (about 15 Ma). In the second stage (about 2.5 Ma), the reservoir experienced the charge of natural gas which modified the hydrocarbon in the reservoir and left some residual bitumen in it. This stage of gas charging was recorded by the black gas inclusion; the difference of hydrocarbon saturation in different members was mainly caused by the difference of reservoir quality.

10.6056/dkyqt201603005