准噶尔盆地车排子地区“油亮点”形成机理及识别方法
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摘要
准噶尔盆地车排子地区排2井在新近系沙湾组获得高产工业油流,排2井油藏在地震剖面上具有油亮点特征。利用正演检测确定了油亮点的地震反射特征,并通过分析影响油层及其围岩波阻抗变化的因素,明确了油亮点的形成机理。利用地震振幅属性描述技术、分频检测技术和叠前AVO属性技术对油亮点进行识别,并结合勘探实践总结了3种常见的假亮点。
High-yielding commercial oil flow was acquired from Well Pai-2 in the Neogene Shawan formation in Chepaizi area of Junggar basin.In seismic profile,since Well Pai-2 oil reservoir has bright spot characteristic,it is called "oil bright spot".In this paper,the seismic reflection characteristic of such an "oil bright spot" was confirmed by means of forward modeling,and its formation mechanism was defined by analyzing the influence factors of wave impedance changes of the reservoir and its surrounding rocks.And then the oil bright spots were identified by using seismic amplitude attribute description,frequency decomposition and prestack AVO techniques.Three common bright spot pitfalls were also summed up by integrated with the exploration practice for the purpose of improving the success ratio of petroleum exploration in the future.
High-yielding commercial oil flow was acquired from Well Pai-2 in the Neogene Shawan formation in Chepaizi area of Junggar basin.In seismic profile,since Well Pai-2 oil reservoir has bright spot characteristic,it is called "oil bright spot".In this paper,the seismic reflection characteristic of such an "oil bright spot" was confirmed by means of forward modeling,and its formation mechanism was defined by analyzing the influence factors of wave impedance changes of the reservoir and its surrounding rocks.And then the oil bright spots were identified by using seismic amplitude attribute description,frequency decomposition and prestack AVO techniques.Three common bright spot pitfalls were also summed up by integrated with the exploration practice for the purpose of improving the success ratio of petroleum exploration in the future.
引文
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[2]周家雄,刘薇薇,孙月成,等.小于地震分辨率极限的薄储集层预测技术[J].新疆石油地质,2010,31(5):554-556.
[3]向奎,鲍志东,庄文山.准噶尔盆地滩坝砂石油地质特征及勘探意义[J].石油勘探与开发,2008,35(2):195-200.
[4]王离迟,洪太元,江洪.强振幅地震属性分析技术在车排子地区油气检测中的应用[J].新疆地质,2006,24(3):310-313.
[5]彭晓波,严丽萍,张庆堂,等.AVO油气勘探技术[J].油气田地面工程,2010,29(2):67-68.
[6]王兴谋,韩文功,李红梅,等.浅层岩性气藏地震检测的陷阱分析[J].石油大学学报(自然科学版),2003,27(1):19-22.
[7]齐宇,刘震,魏建新,等.基于小波变换的谱分解技术在地震模型解释中的应用[J].新疆石油地质,2010,31(4):417-419.
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