歧深地区沙三段沉降特征及其与构造演化的关系
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摘要
对歧深地区重点勘探层段进行沉降史模拟,可了解其沉降速率的时空展布特征,同时也可以研究沉降特征与盆地构造演化阶段之间的关系。以歧深地区的三维地震资料为基础,合理选取各项模拟参数,利用EBM盆地模拟软件对沙三段进行了沉降史模拟。模拟结果表明沙三段各亚段沉积期的沉降特征既有明显的继承性又有一定的差异性;沙三段时期,歧深地区的沉降特征与构造演化密切相关,其构造应力状态由初始的强烈伸展应力状态先后经历显著减弱、小幅减弱两次演变,即在沙三段沉积期盆地经历了断陷初始期、断陷加速期和断陷减弱期三个演化阶段;歧深地区沉降特征与构造作用控制着沙三段各亚段的沉积砂体展布。综合研究歧深地区高速沉降特征与成藏规律,认为歧深地区沙三段存在超压油气成藏模式。沉降史模拟研究揭示了沙三段时期盆地的沉降速率特征及其与构造演化的关系,同时初步探讨了沉降特征与沉积、成藏的关系,从而为研究区精细油气勘探奠定了良好基石。
Carrying on the subsidence history simulation in Qishen area key exploration stratigraphic interval,understand the space and time distribution characteristic of its subsidence rate,simultaneously study the subsidence characteristic and its relationships with the basin structure evolutionary.Take Qishen area's three dimensional seismic data as a foundation,select each simulation parameter reasonably,carry on the subsidence history simulation on Sha III member by using the EBM basin simulation software.The analogue result indicates that subsidence features of each sub-member of the Sha III member depositional stage have the characteristics of both obvious succession and certain difference.Further analysis reveals: Sha III member stage,subsidence features of Qishen area is related to its tectonic evolution,its tectonic stress condition experiences successively by the initial intense extension stress condition two evolutions of obviously weakening and the small scale weakening.Which means Sha III member sedimentary basin experienced three evolutionary phases as the fault depression initial period,accelerating period and weakening period.The analogue result also indicates: Qishen area subsidence characteristic and the tectonism are controlling the sedimentary sand body distribution of each sub-member of Sha III member.According to the comprehensive study of Qishen high speed subsidence features and reservoir forming law,it is thought overpressure oil and gas reservoir existed in Sha II member of Qishen area.The subsidence history simulator study has revealed Sha III member basin sedimentation rate characteristic and its relationship with tectonic evolution,meanwhile discussed the subsidence characteristic and its relationship with the deposition and formation,thus established the good foundation for the research area fine oil-gas exploration.
Carrying on the subsidence history simulation in Qishen area key exploration stratigraphic interval,understand the space and time distribution characteristic of its subsidence rate,simultaneously study the subsidence characteristic and its relationships with the basin structure evolutionary.Take Qishen area's three dimensional seismic data as a foundation,select each simulation parameter reasonably,carry on the subsidence history simulation on Sha III member by using the EBM basin simulation software.The analogue result indicates that subsidence features of each sub-member of the Sha III member depositional stage have the characteristics of both obvious succession and certain difference.Further analysis reveals: Sha III member stage,subsidence features of Qishen area is related to its tectonic evolution,its tectonic stress condition experiences successively by the initial intense extension stress condition two evolutions of obviously weakening and the small scale weakening.Which means Sha III member sedimentary basin experienced three evolutionary phases as the fault depression initial period,accelerating period and weakening period.The analogue result also indicates: Qishen area subsidence characteristic and the tectonism are controlling the sedimentary sand body distribution of each sub-member of Sha III member.According to the comprehensive study of Qishen high speed subsidence features and reservoir forming law,it is thought overpressure oil and gas reservoir existed in Sha II member of Qishen area.The subsidence history simulator study has revealed Sha III member basin sedimentation rate characteristic and its relationship with tectonic evolution,meanwhile discussed the subsidence characteristic and its relationship with the deposition and formation,thus established the good foundation for the research area fine oil-gas exploration.
引文
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[2]庞雄奇.地质过程定量模拟[M].北京:石油工业出版社,2003:39-47.
[3]付代国,梁文生,罗家群,等.南阳凹陷核桃园组沉降特征与构造演化关系研究[J].石油地质与工程,2008,22(4):4-6.
[4]陈亮,甘华军,祝春荣,等.北部湾盆地涠西南凹陷沉降史研究[J].新疆石油学院学报,2002,14(4):12-17.
[5]大港油田石油地质志编辑委员会.中国石油地质志(卷四)[M].北京:石油工业出版社,1991:1-5.
[6]李思田,解习农,王华,等.沉积盆地分析基础与应用[M].北京:高等教育出版社,2004:275-284.
[7]王志雄,陈刚,李睿,等.鄂尔多斯盆地伊陕斜坡东北部榆林地区中生代沉降史分析[J].石油地质与工程,2009,23(3):1-5.
[8]杜旭东,漆家福,陆春生.沉降史反演的现状与应用[J].世界地质,1997,16(2):23-27.
[9]王敏芳,焦养泉,任建业,等.准噶尔盆地侏罗纪沉降特征及其与构造演化的关系[J].石油学报,2007,28(1):27-32.
[10]曹强,叶加仁,王巍.沉积盆地地层剥蚀厚度恢复方法及进展[J].中国石油勘探,2007,(6):41-46.
[11]王敏芳,黄传炎,徐志诚,等.浅述地层剥蚀量恢复的基本原理与方法[J].海洋石油,2006,26(1):28-34.
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