QUANTITATIVE ASSESSMENT OF FREE GAS BENEATH GAS HYDRATE STABILITY ZONE FROM PRESTACK SEISMIC DATA AND ROCK PHYSICS: A CASE OF HOLE NGHP01-10A, KRISHNA-GODAVARI BASIN, INDIA

Chinese Journal of Geophysics Pub Date : 2016-10-10 DOI:10.1002/cjg2.20238

QIAN Jin, WANG Xiu-Juan, DONG Dong-Dong, WU Shi-Guo, SAIN Kalachand, YE Yue-Ming

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引用次数: 2

Abstract

The distribution, saturation, and hydrate indicator of free gas beneath gas hydrate stability zone have been the difficulty in the research of gas hydrate. Amplitude versus offset (AVO) and rock physics can be used to quantitatively interpret free gas saturation. In this paper, seismic data, acquired at K-G basin, India, are processed to preserve true amplitude information. Based on the logging data and horizon calibration, free gas saturation of NGHP01-10A is assessed with effective medium theory and AVO modeling. It is found that free gas saturation is related to its distribution patterns. Assessments of free gas saturation in homogeneous and patchy distribution are 0.3%∼0.4% and 3%∼4%, respectively. The results show good agreement with the crossplot of Poisson's ratio which are calculated from the measurement at NGHP01-10D. Free gas is further deduced to be homogeneous distribution on the base of dry frame Poisson's ratio with the saturation of 0.3%∼0.4%.

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基于叠前地震资料和岩石物理的天然气水合物稳定带游离气定量评价——以印度krishna-godavari盆地nghp01-10a井为例

天然气水合物稳定带下游离气的分布、饱和度及水合物指示指标一直是天然气水合物研究的难点。振幅相对偏移量(AVO)和岩石物理可用于定量解释游离气饱和度。本文对印度K-G盆地的地震数据进行了处理，以保留真实振幅信息。在测井资料和层位标定的基础上，运用有效介质理论和AVO模型对NGHP01-10A储层游离气饱和度进行了评价。发现游离气饱和度与其分布模式有关。均匀分布和斑状分布的游离气饱和度评估值分别为0.3% ~ 0.4%和3% ~ 4%。结果与NGHP01-10D测得的泊松比交线图吻合较好。根据干骨架泊松比，进一步推导出游离气为均匀分布，饱和度为0.3% ~ 0.4%。

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Chinese Journal of Geophysics

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