| Gas hydrates saturation using geostatistical inversion in a fractured reservoir in the Krishna-Godavari basin, offshore eastern India | |
Wang, Xiujuan1,3; Sain, Kalachand2; Satyavani, Nittala2; Wang, Jiliang1,3 ; Ojha, Maheswar2; Wu, Shiguo1,3; Wang, XJ
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| 2013-08-01 | |
| 发表期刊 | MARINE AND PETROLEUM GEOLOGY
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| ISSN | 0264-8172 |
| 卷号 | 45页码:224-235 |
| 文章类型 | Article |
| 摘要 | A reservoir of gas hydrates filling fractures was discovered in the Krishna-Godavari (KG) Basin during the Indian National Gas Hydrate Program (NGHP) Expedition 01 at site NGHP01-10. The existing methods for estimating gas hydrate saturation from seismic data rely on establishing an empirical relation between acoustic impedance and density porosity from well logs assuming isotropic pore-filling gas hydrate. This method, however, yields a misleading saturation for fractured clay-dominated sediments. Here we present a methodology to estimate gas hydrate saturation from seismic data based on geostatistical inversion. It integrates the verticals detail of well log data with the lateral details from seismic data to produce highly detailed estimates of gas hydrate saturation. First, gas hydrate saturation is calculated from P-wave velocities assuming anisotropic distribution at the well site. Then, probability density functions (PDFs) between acoustic impedance and the calculated gas hydrate saturation at the well site are analyzed. A Markov Chain Monte Carlo method is employed to integrate well logs with the seismic data to produce acoustic impedance. Finally, crossplots and histograms at the well site are used to estimate gas hydrate saturations along the seismic line from inverted acoustic impedance. The spatial distribution of gas hydrate varies both laterally and vertically along the line with an average saturation of 22.5%. The estimate matches reasonably with the value at the wells. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.; A reservoir of gas hydrates filling fractures was discovered in the Krishna-Godavari (KG) Basin during the Indian National Gas Hydrate Program (NGHP) Expedition 01 at site NGHP01-10. The existing methods for estimating gas hydrate saturation from seismic data rely on establishing an empirical relation between acoustic impedance and density porosity from well logs assuming isotropic pore-filling gas hydrate. This method, however, yields a misleading saturation for fractured clay-dominated sediments. Here we present a methodology to estimate gas hydrate saturation from seismic data based on geostatistical inversion. It integrates the verticals detail of well log data with the lateral details from seismic data to produce highly detailed estimates of gas hydrate saturation. First, gas hydrate saturation is calculated from P-wave velocities assuming anisotropic distribution at the well site. Then, probability density functions (PDFs) between acoustic impedance and the calculated gas hydrate saturation at the well site are analyzed. A Markov Chain Monte Carlo method is employed to integrate well logs with the seismic data to produce acoustic impedance. Finally, crossplots and histograms at the well site are used to estimate gas hydrate saturations along the seismic line from inverted acoustic impedance. The spatial distribution of gas hydrate varies both laterally and vertically along the line with an average saturation of 22.5%. The estimate matches reasonably with the value at the wells. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved. |
| 关键词 | Gas Hydrate Saturation Geostatistical Inversion Fractures |
| 学科领域 | Geology |
| DOI | 10.1016/j.marpetgeo.2013.04.024 |
| URL | 查看原文 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:000322056600017 |
| WOS关键词 | GULF-OF-MEXICO ; MAKRAN ACCRETIONARY PRISM ; SEISMIC DATA ; UNCONSOLIDATED SEDIMENTS ; IMPEDANCE INVERSION ; CONTINENTAL-MARGIN ; ELASTIC-ANISOTROPY ; MARINE-SEDIMENTS ; ROCK ; VELOCITIES |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/16304 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Wang, XJ |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.CSIR Natl Geophys Res Inst, Hyderabad 500007, Andhra Pradesh, India 3.Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Wang, Xiujuan,Sain, Kalachand,Satyavani, Nittala,et al. Gas hydrates saturation using geostatistical inversion in a fractured reservoir in the Krishna-Godavari basin, offshore eastern India[J]. MARINE AND PETROLEUM GEOLOGY,2013,45:224-235. |
| APA | Wang, Xiujuan.,Sain, Kalachand.,Satyavani, Nittala.,Wang, Jiliang.,Ojha, Maheswar.,...&Wang, XJ.(2013).Gas hydrates saturation using geostatistical inversion in a fractured reservoir in the Krishna-Godavari basin, offshore eastern India.MARINE AND PETROLEUM GEOLOGY,45,224-235. |
| MLA | Wang, Xiujuan,et al."Gas hydrates saturation using geostatistical inversion in a fractured reservoir in the Krishna-Godavari basin, offshore eastern India".MARINE AND PETROLEUM GEOLOGY 45(2013):224-235. |
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