Gas hydrates saturation using geostatistical inversion in a fractured reservoir in the Krishna-Godavari basin, offshore eastern India

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	Gas hydrates saturation using geostatistical inversion in a fractured reservoir in the Krishna-Godavari basin, offshore eastern India
	Wang, Xiujuan 1,3; Sain, Kalachand 2; Satyavani, Nittala 2; Wang, Jiliang1,3 ; Ojha, Maheswar 2; Wu, Shiguo 1,3
刊名	MARINE AND PETROLEUM GEOLOGY
	2013-08-01
卷号	45 页码:224-235
关键词	Gas hydrate Saturation Geostatistical inversion Fractures
ISSN号	0264-8172
通讯作者	Wang, XJ
中文摘要	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.
英文摘要	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.
学科主题	Geology
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Geosciences, Multidisciplinary
研究领域[WOS]	Geology
关键词[WOS]	GULF-OF-MEXICO ; MAKRAN ACCRETIONARY PRISM ; SEISMIC DATA ; UNCONSOLIDATED SEDIMENTS ; IMPEDANCE INVERSION ; CONTINENTAL-MARGIN ; ELASTIC-ANISOTROPY ; MARINE-SEDIMENTS ; ROCK ; VELOCITIES
收录类别	SCI
原文出处	10.1016/j.marpetgeo.2013.04.024
语种	英语
WOS记录号	WOS:000322056600017
公开日期	2014-07-17
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/16304]
专题	海洋研究所_海洋地质与环境重点实验室
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
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,&Wu, Shiguo.(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.