The prospecting extent in the whole Bachu uplift of Tarim Basin is relatively low,which however is a potential area for oil and gas exploration.The poor near-surface shooting conditions,deeply buried target areas and deep geological conditions result in the serious seismic data static correction problem,highly-developed interference wave,difficulties in correct recognition of multiple wave,improvement of the energy of deep reflection wave and accurate obtaining of the velocity and migration imaging.Low S/N ratio data and poor quality have greatly restricted the capability of solving the geological problem by using seismic data.Through an analysis of newly acquired seismic data,the authors accurately built a near-surface model for calculating accurate static values and enhancing pre-stack attenuation.Various amplitude energy compensation methods were used for accurate velocity analysis to improve the precision of the velocity field,and inner mute was adopted in near traces.Integrated application of cascade methods was adopted to eliminate multiple interference,migration method was chosen for improving the imaging quality of deep weak signal and S/N ratio in this low S/N ratio area and,as a result,event continuity and structure imaging quality were greatly enhanced and improved,thus attaining superior applying results.

The structures in Pucheng-Weicheng area of Dongpu sag are complicated and the exploration mainly focuses on the crushing complex fault blocks and lithologic hydrocarbon reservoirs,such as the fault of the narrow space between two adjacent things,and the small fault blocks.The working area features in large-volume seismic data,complex wave field,and interference wave develops.In view of the characteristics of high-precision seismic data of Pucheng-Weicheng area and geological characteristics of the working area,research has been conducted on the fine processing method and high precision seismic imaging technology.High-precision seismic data processing technologies taking high-precision point-to-point velocity analysis,tomographic inversion static correction,prestack time migration,and prestack interference wave suppression as main features are developed.And obvious progress has been made in data processing.

二维偏移剖面解释工作的基础工作之一是统一的闭合差校正,其校正效果的好坏直接影响到构造成图的精度、钻探井位的优选乃至整个风险探区的勘探步伐.影响闭合差的因素很多也较复杂,本次研究是在可靠的理论分析和因素分析基础上,对地震道的差值结果进行一次性校正,把这个基于地震道的校正结果看作对所有野外采集、处理参数等因素的修正,其剩余校正值看作偏移剖面固有的差异.