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徐闻探区是中石化股份公司在北部湾盆地登记取得的第一个油气勘查区块。我们对区内4口井进行了合成记录制作,进行层位标定。从徐闻x2、徐闻x2a井钻探反馈出发,进行全区地震速度分析研究,应用地层埋深、测井速度、叠加速度等资料进行分析,同时与区域速度及邻区井的vsp资料进行对比,研究发现徐闻x1井vsp速度与徐闻x1声波速度、徐闻x2a声波速度存在较大差异,认为徐闻x1井vsp速度是不可靠的,在此基础上重新了建立了适合于迈陈凹陷东部地区的综合地震速度。
Xuwen Exploration Area is the first oil and gas exploration block Sinopec Corp. registered in Beibu Gulf Basin. We recorded the production of 4 wells in the area and stratified them. Based on the drilling feedbacks of Xuwen x2 and Xuwen x2a wells, the seismic velocity analysis of the whole area is carried out and the data of formation depth, logging speed and superposition velocity are analyzed and compared with the vsp data of regional velocities and adjacent wells. It is found that vsp velocity of Xuwen x1 well is different from that of Xuwen x1 acoustic velocity and Xuwen x2a acoustic velocity. It is considered that the vsp velocity of Xuwen x1 well is not reliable, and on this basis, a comprehensive earthquake suitable for the eastern part of the Mai-Mai depression speed.