印度国家天然气水合物计划第02考察队天然气水合物地层岩石物理评价

Sikha Rani Mondal, K. Chopra
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引用次数: 2

摘要

天然气水合物是天然存在的结晶包裹体化合物。它们由压缩的气体分子(通常是甲烷)组成,这些气体分子“驻留”在水分子的固体晶格中。因此,气体分子被称为“客”,水分子被称为“主”。天然气水合物是在有水和甲烷源的地方,在相对高压和低温的有利热力学条件下形成的。研究的目的是对天然气水合物勘探队2号钻探井的岩石物性进行评价。识别不同的水合物成因,估算水合物饱和度。高电阻率、低透射时间和低密度是评价岩石物性的工作流程。它包括评价不同的叠加层和井的交叉图,如尖桩图,以确定不同的参数。孔隙度采用密度测井测量,含水饱和度采用阿奇方程;用DMR方法计算天然气水合物饱和度及其对压力岩心结果的验证。本研究主要利用密度孔隙度叠加技术识别潜在的天然气水合物层,利用声波传播时间和其他密度孔隙度与核磁共振总孔隙度叠加技术识别潜在的天然气水合物层,并利用电阻率测井识别潜在的天然气水合物层。利用密度测井估计的孔隙度计算水合物饱和度。采用标准阿奇方程和密度磁共振(DMR)方法估算天然气水合物饱和度。在核磁共振测井数据良好的地方,两者估计的饱和度非常吻合。将测井所得的水合物饱和度与压力岩心所得的水合物饱和度进行了对比验证。在BSR以上有21口井观察到很好的天然气水合物饱和带,范围在40-90%之间。在这21口井中,16口井的天然气水合物饱和度在30-50%之间。KG深水盆地天然气水合物饱和度较好的井主要分布在B区和C区。该研究对建立地质模型,准确估算天然气水合物储量具有重要意义。这项研究还将有助于NGHP-3确定进行天然气水合物试点生产测试的合适地点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Petrophysical Evaluation of Gas-Hydrate Formations in National Gas Hydrates Programme Expedition 02 in India
Gas hydrates are naturally-occurring crystalline inclusion compounds. They comprise compressed molecules of gas (usually methane) that are ‘lodged’ within a solid lattice of water molecules. For this reason, the gas molecules are called ‘guests’ and the water molecules are called ‘hosts’. Gas hydrates form where there are sources of water and methane under favorable thermodynamic conditions of relatively high pressure and low temperature. Objective of the study is to evaluate Petrophysical Properties from drilled well of NGHP expedition 2 for Gas Hydrate. To identify different hydrate formation and estimation of hydrate saturation. The Work flow to estimate Petrophysical properties is guided by the high resistivity, low transit time and low density. It includes evaluation of different overlays and cross plots of wells like picket plot to firm up different parameters. Porosity is measured by density log, water saturation using Archie's equation; gas hydrate saturation using DMR method and its validation for the results obtained from Pressure core. Electrical resistivity and acoustic travel time mainly used to identify potential Gas Hydrate zones with overlay technique from density porosity and acoustic travel time and other density porosity with total NMR porosity, along with resistivity log are used for identifying potential Gas Hydrate zones in this study. Porosity estimated from density log is used for calculation Hydrate saturation. Gas Hydrate saturation is estimated using standard Archie's equation and Density Magnetic Resonance (DMR) method. Wherever NMR log data is good, saturation estimated from both are in good agreement. Log derived Gas Hydrate saturation are compared and validated with Gas Hydrate saturation obtained from pressure cores. Very good Gas Hydrate saturated zones are observed above BSR in 21 wells in the range of 40-90%. Out of these 21 wells, 16 wells are also having Gas Hydrate saturation in the range of 30-50%. Good Gas Hydrate saturation wells are mainly in area B and C in KG deep water Basin. This study will be very useful in preparation of Geological model for estimation of Gas Hydrate reservesaccurately. This study will also help in NGHP-3 for identifying suitable sites to carry out pilot production testing of Gas Hydrates.
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