川南资阳地区三维地震采集技术研究及应用效果分析

发布时间：2018-06-16 07:17

本文选题：资阳地区 + 观测系统设计　；参考：《西南石油大学》2016年硕士论文

【摘要】：川南资阳丹山-石湍(东峰场)石油天然气勘查区块位于四川盆地川西南坳陷的西北部,其构造处于威远大型穹窿背斜构造东北部的威远高陡构造带与高石梯-磨溪低缓构造带之间的缓坡带内,地震解释在龙王庙组、灯影组、茅口组都见明显“滩相地震反射特征”及明显“亮点”反射特征,与邻区已知磨溪及高石梯气藏反射特征类似,磨溪及高石梯在海相下组合已取得重大油气发现,预示本区海相下组合具有良好的勘探前景。区内仅实施了二维地震勘探,以往主要勘探目的层为三叠系须家河组,造成海相下组合地层信噪比较低,不能满足海相下组合岩性勘探要求,为了实现该区海相碳酸盐岩地层油气勘探的战略性突破,进行该区采集技术的研究是十分必要。通过对川中资阳地区以前采集时所用的观测系统、激发因素、接收因素以及地震资料分析、研究的基础上,以获取高品质的地震资料完成该地区的地质任务和采集要求为目标,通过观测系统设计软件设计较为适合该地区的观测系统；针对不同的地形以及岩性进行针对性的激发因素试验；开展数字检波器及模拟检波器接收因素试验。确定适合该地区地震采集的最佳激发因素和接收因素；通过资阳三维采集项目的实施,分析应用效果,建立一套适合该地区针对主要勘探对象的地震采集技术。通过研究工作可以证实：1)采用18L4S (120+120) T1R108F束状式观测系统在该地区较大地提高了深层反射资料的叠加成像效果,达到提高资料品质特别是分辨率和信噪比的目的。2)较为合适的激发因素,采用数学检波器接收能在该地区复杂表层地质条件下获得信噪比较高、连续性较好、激发频谱较宽的原始单炮记录和监控剖面。
[Abstract]:The oil and gas exploration block of Danshan-Shi turbulent (Dongfeng field) in Ziyang, southern Sichuan Basin, is located in the northwest of the southwest depression of Sichuan Basin. The structure is located in the gentle slope zone between the Weiyuan high and steep structural belt and the Gaoshitian-Moxi low gentle structural belt in the northeast of Weiyuan large dome anticline. The seismic interpretation is in Longwangmiao formation and Dengying formation. The Maokou formation shows obvious "beach seismic reflection characteristics" and obvious "bright spot" reflection characteristics, which are similar to those of the known Moxi and Gaositi gas reservoirs in the adjacent area. Major oil and gas discoveries have been made in the Moxi and Gaoshitian assemblages under the marine facies. It indicates that the marine assemblage in this area has a good prospect for exploration. Only 2-D seismic exploration has been carried out in this area. In the past, the main exploration target was the Xujiahe formation of Triassic system, which resulted in low signal-to-noise ratio (SNR) of the submarine assemblage, which could not meet the requirements of the submarine assemblage lithologic exploration. In order to realize the strategic breakthrough of oil and gas exploration in marine carbonate strata, it is necessary to study the acquisition technology in this area. Based on the analysis of the observation system, excitation factors, receiving factors and seismic data used in the previous acquisition in Ziyang area of central Sichuan, the aim is to obtain high quality seismic data to complete the geological tasks and acquisition requirements in this area. Through the design of the observation system software design is more suitable for the observation system in this area; aiming at different topography and lithology of the targeted excitation factor test; digital geophone and analog geophone receiving factor test. Through the implementation of the Ziyang 3D acquisition project and the analysis of the application effect, a set of seismic acquisition technology suitable for the main exploration objects in this area is established. It is proved by the research work that the beam observation system T1R108F using 18L4S / 120) T1R108F has greatly improved the superposition imaging effect of deep reflection data in this area. In order to improve the quality of data, especially the resolution and signal-to-noise ratio (SNR), the more suitable excitation factors are obtained. The receiver of mathematical geophone can obtain higher SNR and better continuity under the complicated surface geological conditions in this area. Original single shot recording and monitoring profile with wider excitation spectrum.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P618.13

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