牛驼镇凸起发育过程
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摘要
针对牛驼镇凸起抬升时间和内幕结构研究不足的问题,运用地球物理方法和平衡剖面技术,研究牛驼镇凸起发育过程.结果表明:牛东断层与派生断层组成"Y"型,牛东断层下盘发育阶梯状逆冲断层.研究区构造演化经历3个阶段:J-K为凸起发育前潜山内幕形成期,其中J2末-J3为逆冲褶皱发育期;E1k-E3d为凸起形成期,其中E2s3-E3d为廊固—牛驼镇断块翘倾发育期;N-Q为凸起埋藏期.中生代主要受区域挤压和走滑运动的影响;新生代伸展构造、走滑运动及基底沉降控制牛驼镇凸起的演化,并与断层的产状相关.根据地震剖面、构造演化剖面特征得出内幕存在逆断层,E2s3凸起发育明显.通过分析构造演化对烃源岩、储集层、盖层、运移通道和圈闭的影响,预测牛驼镇凸起存在潜山内幕油气藏.
In accordance with insufficient cognition of Niutuozhen uplift rising time and inner structure,based on the previous research results,the method of geophysical method and equilibrium profile is applied to development process of Niutuozhen uplift.The results show that Niudong fault and adjusting fault form Y type,three reverse step faults under Niudong fault.The structure evolution can be divided into three stages:J-K was structure stage before the uplift was developed,J2end-J3 was compressive and thrusting stage.K1k- E2 d was development of Niutuozhen uplift,E2s3- E3 d was LangguNiutuozhen fault-block rotation stage.N-Q was large depression stage.Mesozoic structure was controlled by regional extrusion and strike-slip motion.During the Cenozoic period,the evolution of the salient was controlled by extensional structure,strike-slip motion and basement subsidence.And it has connection with fault's occurrence.By analyzing seismic profiles and structure evolution profile characteristics,it could be concluded that there were reverse faults in the uplift and Niutuozhen uplift was developed obviously in the E2s3.By analyzing the influence of source rock,reservoir,cap rock,migration passage and trap,it could be concluded that Ni-utuozhen uplift developed favorable conditions and buried hills reservoirs would probably be found.
引文
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