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天然气地球科学

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南海神狐海域天然气水合物储层参数测井评价

刘洁1，张建中1,2，孙运宝3，赵铁虎2,3   

  1. 1．海底科学与探测技术教育部重点实验室,中国海洋大学海洋地球科学学院，山东 青岛 266100；
    2．海洋国家实验室海洋矿产资源评价与探测技术功能实验室，山东 青岛，266061；
    3．中国地质调查局青岛海洋地质研究所，山东 青岛 266071
  • 收稿日期:2016-04-11 修回日期:2016-09-27 出版日期:2017-01-10 发布日期:2017-01-10
  • 通讯作者: 张建中(1963-)，男，陕西白水人，教授，博士生导师，主要从事地球物理探测理论、方法和技术及其应用研究与教学工作. E-mail：zhangjz@ouc.edu.cn.
  • 作者简介:刘洁(1992-)，男，山东淄博人，博士研究生，主要从事天然气水合物及储层预测与评价研究. E-mail：liujieouc@126.com.
  • 基金资助:

    中国地质调查局国家海洋地质专项工作项目(编号：GZH201100308)；国家自然科学基金项目(编号：41230318;41074077)联合资助.

Gas hydrate reservoir parameter evaluation using logging datain the Shenhu area,South China Sea

Liu Jie1，Zhang Jian-zhong1,2，Sun Yun-bao3，Zhao Tie-hu2,3   

  1. 1.Key Lab of Submarine Geosciences and Prospecting Techniques,Ministry of Education,College of Marine Geosciences,Ocean University of China,Qingdao 266100,China;
    2.Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266061,China;
    3.Qingdao Institute of Marine Geology,CGS,Qingdao 266071,China
  • Received:2016-04-11 Revised:2016-09-27 Online:2017-01-10 Published:2017-01-10

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摘要：

南海北部神狐海域经历了复杂的构造演化过程，断裂发育，该区天然气水合物的垂向分布具有明显的不连续性和不均匀性。利用测井资料计算地层孔隙度和水合物储层饱和度等参数，对深入研究储层水合物分布特征、储层优选等具有重要意义。基于电阻率和声波测井等资料，讨论了地层孔隙度的几种计算和修正方法，并在此基础上对南海神狐海域SH2井水合物饱和度做了探讨和定量评价。结果表明：考虑泥质含量和井径变化等因素的影响，要对密度法计算的孔隙度进行适当修正；含泥质修正的电阻率法能较准确地预测水合物饱和度；不同的岩石物理模型影响饱和度的计算结果，四相介质Wood方程和等效介质理论各有优势和不足，将上述2个模型结合得到改进的Wood方程计算的水合物饱和度与通过氯离子浓度异常计算的饱和度值吻合较好。多种评价方法结果相一致可表明水合物的大致分布，由此估计沿SH2井饱和度大于20%的水合物层厚度约为22m，最大含量约为23%。

关键词: 天然气水合物, 孔隙度, 饱和度, 电阻率, 岩石物理模型, 神狐海域

Abstract:

The Shenhu area,northern South China Sea,has experienced a complex tectonic evolution process,full of faults,and the vertical distribution of gas hydrate zone is obviously discontinuous and uneven.Estimating formation porosity and hydrate reservoir saturation and other parameters using logging data has great significance for further study of reservoir distribution characteristics and selection of high quality reservoir.Based on resistivity and sonic logging data,several estimation and correction methods of porosity were discussed.Then,gas hydrate saturation of Well SH2 in the Shenhu area of South China Sea was studied and evaluated quantitatively.It is shown that when considering the effect of clay content and hole diameter change,the porosity estimated by density method should be corrected appropriately,and the mud-modified resistivity method can more accurately describe the hydrate saturation.Besides,the selection of rock-physics models in velocity method is one of the most important factors affecting the inversion saturation.Four-phase Wood equation and effective medium theory have certain advantages and deficiencies,and a modified Wood equation is got by the combination of above two models.The hydrate saturation calculated by the modified Wood equation is well consistent with the estimated results by chloride ion concentration anomaly.The consistent results of different evaluation methods indicate the general distribution of gas hydrate,and it is estimated that the thickness of layer along Well SH2 where hydrate saturation is greater than 20% is about 22m,and the maximum concentration is about 23%.

Key words: Natural gas hydrate, Porosity, Saturation, Resistivity, Rock physics modeling, Shenhu area

中图分类号: 

  • TE373

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