文章摘要
涠洲N油田砂体精细刻画
Fine Characterization of Sand in Weizhou N Oilfield
投稿时间:2022-07-04  修订日期:2022-07-04
DOI:
中文关键词: 涠西南  储层  谱蓝化  纵波阻抗  波形指示
英文关键词: Weixinan  reservoir  spectrum blueing  P-wave impedance  waveform indication
基金项目:中海石油海上中深层油藏地球物理技术及其应用研究(YXKY-2019-ZY-05)
作者单位邮编
彭军 中海石油(中国)有限公司湛江分公司 524057
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中文摘要:
      涠西南凹陷为南海主产油区,其流一段为主要油气储集层之一。流一段由于沉积条件及应力影响,多发育断层+岩性油藏。涠洲N油田即为流一段成藏的断层+岩性油藏,该油田在在流一上段II油组地震同相轴极为连续,但是实际钻井在高部位钻遇水层在低部位钻遇油层,表现为不同砂体。地震同相轴连续性极好,依旧为不同砂体,这给地球物理研究带来了极大挑战。为解决此问题,使用多种方法开展了该油组砂体精细刻画研究。首先从地震资料入手分析了该油组地震分辨率情况,发现现有地震资料分辨率小于油组砂体厚度后,采用谱蓝化提高地震分辨率,以达到对该油组井间砂体展布的识别,但是该方法并未有效解决油水问题。其次在高分辨率地震资料基础上采用地球物理反演方法来解决问题,采用常规叠后波阻抗与波形指示反演来进行精细砂体研究。相比于常规波阻抗反演波形指示反演分辨率更高,与钻井温和更好。涠洲N油田其波形指示反演结果显示高低部位为不同的砂体,这有效解决了该油田油水矛盾的问题,指明了后续井位布设方向。
英文摘要:
      The Weixinan Sag is the main oil producing area in the South China Sea, and its first member is one of the main oil and gas reservoirs. Due to the influence of sedimentary conditions and stress, fault + lithologic reservoir is mostly developed in Liuyi member. Weizhou n oilfield is a fault + lithologic reservoir formed in the first member of Liuhe formation. The seismic event axis of the oilfield is very continuous in the second oil formation of the first member of Liuhe formation. However, the actual drilling meets the water layer in the high part and the oil layer in the low part, which is shown as different sand bodies. The continuity of seismic event axis is excellent, and there are still different sand bodies, which brings great challenges to geophysical research. In order to solve this problem, many methods are used to study the fine characterization of the sand body of the oil formation. Firstly, the seismic resolution of the oil formation is analyzed from the seismic data. It is found that after the resolution of the existing seismic data is less than the thickness of the sand body of the oil formation, the Spectral Blue is used to improve the seismic resolution, so as to identify the distribution of sand body between wells of the oil formation, but this method does not effectively solve the oil-water problem. Secondly, based on the high-resolution seismic data, the geophysical inversion method is used to solve the problem, and the conventional post stack wave impedance and waveform indication inversion are used to study the fine sand body. Compared with the conventional wave impedance inversion, the waveform indication inversion resolution is higher and better than the drilling temperature. The waveform indication inversion results of Weizhou n oilfield show that the high and low parts are different sand bodies, which effectively solves the problem of oil-water contradiction in the oilfield and points out the layout direction of subsequent well locations.
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