对涠西南凹陷流二段岩性圈闭勘探中两个特殊情况的思考
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中海石油(中国)有限公司湛江分公司,中海石油(中国)有限公司湛江分公司,中海石油(中国)有限公司湛江分公司,中海石油(中国)有限公司湛江分公司,中海石油(中国)有限公司湛江分公司

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TE51

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Pondering on two particular situations of lithologic trap exploration in the second member of Liushagang formation in Weixinan sag
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    摘要:

    流沙港组二段是涠西南凹陷烃源岩发育的主要层位,以中深湖相暗色泥岩沉积为主,同时具有复杂的沉积体系,以岩性圈闭勘探为主。由于流二段砂泥岩阻抗差异较大,前人主要根据地震资料中的流二段“强振幅”来落实流二段岩性圈闭。近年新钻井表明,流二段“强振幅”并非都是储层,也可能是来自易风化剥蚀灰岩基底区的灰质砂岩。流二段弱振幅不一定就是泥页岩,也可能是与上覆地层阻抗相当的储层。本文对这两种特殊情况的形成原因和特殊情况下的储层识别方法进行系统分析,并就在复杂沉积体系区如何准确利用振幅预测储层提出建议。

    Abstract:

    The second member of liushagang formation is the principal layer of source rocks in Weixinan sag,the lithology is given priority to dark mudstone of deep lake facies,has the complicated depositional system,lithologic trap exploration is the main type of exploration.Due to the large difference of impedence between sandstone and mudstone in the second member of liushagang formation,predecessor based implementation of lithologic trap on“strong amplitude”of seismic data in the second member of liushagang formation.In recent years,the new drilling data indicates that not all the“strong amplitude”of seismic data in the second member of liushagang formation are reservoirs,may also be the calcareous sandstone from limestone basal area which are easy to weathering denudation.The “weak amplitude” in the second member of liushagang formation are not necessarily the mudstones,may also be the reservoirs which have the similar impedence with overlying layers.This paper systematically analyzes the causes of formation about the two particular situations and the reservoir identification methods in the two particular situations,then gives proposal that how to accurately utilize the amplitude to predict reservoir in the complicated depositional system.

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陈林,姜丽丽,杨希冰,等. 对涠西南凹陷流二段岩性圈闭勘探中两个特殊情况的思考[J]. 科学技术与工程, 2014, 14(27): .
chenlin,,,et al. Pondering on two particular situations of lithologic trap exploration in the second member of Liushagang formation in Weixinan sag[J]. Science Technology and Engineering,2014,14(27).

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  • 收稿日期:2014-05-15
  • 最后修改日期:2014-06-11
  • 录用日期:2014-06-10
  • 在线发布日期: 2014-09-24
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