从Y古1潜山落空看潜山与砂砾岩扇体对应关系
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摘要
Y古1潜山在三维地震剖面上潜山形态完整,但实钻结果显示前震旦系界面深度与地震剖面潜山界面反射深度相差较大,该文针对Y古1井构造落空的主要原因进行了讨论。通过与郑家潜山对比分析,提出潜山形态不落实是其主要原因并且与该潜山上覆厚达几百米的砾岩盖层有关,与通常的沟扇对应理论不符。在今后的勘探中,应用地震资料针对潜山上覆砾岩反射速度的问题,如能变速成图,则会在一定程度上减少勘探的盲目性。
YG-1 buried hill had a complete hill form on 3D seismic profile, but the practical drilling result showed that the depth difference between the interfacial depth of Presinian and the reflecting depth of the buried hill interface on the seismic profile was larger. The paper discussed the major reasons for the absence of the buried hill structure of Well YG-1. By analyzing and correlating with Zhengjia buried hill, it provided that the buried hill form being not clear was the major reason and it was related with the overlying conglomerate cap rock bed that the thickness of which was up to hundreds of meters,and it was not in keeping with the normal theory of canal and segment correspondence. During the future exploration,according to the problem of reflecting velocity from the overlying conglomerate of the buried hill, if the velocity can be changed to corresponding chart by applying seismic information, the exploration blindness can be reduced at a certain degree.
YG-1 buried hill had a complete hill form on 3D seismic profile, but the practical drilling result showed that the depth difference between the interfacial depth of Presinian and the reflecting depth of the buried hill interface on the seismic profile was larger. The paper discussed the major reasons for the absence of the buried hill structure of Well YG-1. By analyzing and correlating with Zhengjia buried hill, it provided that the buried hill form being not clear was the major reason and it was related with the overlying conglomerate cap rock bed that the thickness of which was up to hundreds of meters,and it was not in keeping with the normal theory of canal and segment correspondence. During the future exploration,according to the problem of reflecting velocity from the overlying conglomerate of the buried hill, if the velocity can be changed to corresponding chart by applying seismic information, the exploration blindness can be reduced at a certain degree.
引文
〔1〕王华芬,屈中英.王庄变质岩油藏.北京:石油工业出版社,1997
〔2〕徐开礼,朱志澄.构造地质学.北京:地质出版社,1987
〔3〕潘元林,孙龙德,史文东等.永北-盐家地区沙三沙田段砂砾盐体油藏描述.北京:地震出版社,1998
〔2〕徐开礼,朱志澄.构造地质学.北京:地质出版社,1987
〔3〕潘元林,孙龙德,史文东等.永北-盐家地区沙三沙田段砂砾盐体油藏描述.北京:地震出版社,1998
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