亚诺斯盆地Carbonera组3段水下河道识别及古流向分析
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摘要
亚诺斯盆地C区(研究区)处于勘探初期,钻井、测井资料有限,地球物理资料相对丰富。以地震属性、地震相分析为主,结合钻井、测井资料对工区新近系Carbonera组3段河道砂体识别、展布与古水流方向进行了研究。研究表明:综合利用三维地震相干属性与均方根振幅属性,可降低不等时问题及后期构造的影响。识别出2条以高相干、强振幅为代表由南向北展布的主水下分流河道。井震结合标定了槽形、峡谷—水道充填等地震相代表的水下河道,验证地震属性识别水下河道的可靠性。在确定河道展布的基础上,利用相带分析法和地震前积反射确定研究区内古水流方向为北、北西向。
The block C of Llanos basin is in the primary stage of exploration, the drilling and logging data is limited but the geophysical data is abundant relatively. Through the seismic attributes and seismic facies analysis, and combined with the drilling and logging data, the study on the channel sand body discrimination, spreading and the direction of paleocurrent in member 3 of the Carbonera formation of Neogene was conducted. The finding shows that comprehensive application of 3D seismic coherent attribute and RMS amplitude attribute can reduce anachronism and post-tectonic influence. Two main underwater distributary channels, with highly coherent and high amplitude, spread from south to north were identified. Combination of well and seismic can determine the underwater channel with the seismic facies of trough filling and the canyon-channel filling, and verify the reliability of applying seismic attributes to identify underwater channel. Based on the determination of channel spreading, using facies belt analysis method and seismic progradation reflection determined the direction of paleocurrent in the study area was north or west north trending.
引文
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