| 热处理对致密岩石物理性质的影响 |
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| 引用本文： | 游利军,康毅力.热处理对致密岩石物理性质的影响[J].地球物理学进展,2009,24(5):1850-1854. |
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| 作者姓名： | 游利军 康毅力 |
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| 作者单位： | 西南石油大学油气藏地质及开发工程国家重点实验室油井完井技术中心,成都,610500 |
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| 基金项目： | 国家科技重大专项大型油气田及煤层气开发，中国石油天然气股份有限公司科技风险创新研究项目，四川省杰出青年学科带头人培养基金项目 |
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| 摘 要： | 致密气藏低孔低渗和超低含水饱和度等特征使其潜在水相圈闭损害严重，致密天然气产出表现为多尺度特征.选取泥页岩、致密砂岩和致密碳酸盐岩岩心，开展了100~600℃高温处理对岩心渗透率、孔隙度、重量、长度、直径和声速的影响实验.实验结果表明，碳酸盐岩、致密砂岩和泥页岩的热开裂阈值分别在300~400℃、300~500℃和500~600℃；高温处理后，岩心重量和密度降低，体积增加，泥页岩岩心孔隙度和渗透率提高幅度最显著，600℃处理后声波时差比常温时岩心声波时差提高了1.3倍.热处理消除了水相圈闭和粘土矿物膨胀损害，提高岩石孔隙度和渗透率，恢复或改善致密储层多尺度传质，有利于致密天然气资源开发，但同时高温使岩石破裂，扩展天然裂缝或产生新裂缝，导致工作液漏失，因此，热致裂给勘探开发致密天然气提出了机遇与挑战.
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| 关 键 词： | 热处理 致密岩石 岩石物理 水相圈闭 多尺度 传质 |
| 收稿时间： | 2009-3-12 |
| 修稿时间： | 2009-6-28 |
Effects of thermal treatment on physical property of tight rock |
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| YOU Li-jun,KANG Yi-li.Effects of thermal treatment on physical property of tight rock[J].Progress in Geophysics,2009,24(5):1850-1854. |
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| Authors: | YOU Li-jun KANG Yi-li |
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| Institution: | (CentreforWellCompletionTechniques,StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation(SouthwestPetroleumUniversity),Chendu610500,China) |
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| Abstract: | Tight gas reservoirs have potential water phase trapping damage due to its low permeability and porosity, various kinds of clay minerals and abnormal low initial water saturation, and tight gas production exhibit multiple scales. This paper takes shale, tight sandstone and carbonate cores from tight gas reservoir in the Sichuan and Ordos Basin. The permeability, porosity, quality, length, diameter and acoustic travel time of tight rock were measured at the temperature from 100℃ to 600℃. The experimental results indict that the physical parameters such as permeability and porosity of shale, tight sandstone, and carbonate respectively are elevated remarkably at 300～400℃, 300～500℃ and 500～600℃. Core quality and density decrease, and volume increases after thermal treatment, the acoustic travel time of tight cores at 600℃ increases by 1. 3 times compared to that at 30℃. Thermal treatment causes the permeability of shale cores to increase most notably than tight sandstone and carbonate. High temperature treatment can remove the damage due to water phase trapping and hydrate expansion of clay mineral and enhance porosity and permeability, can restore or improve the multiple scale transfer ability of tight gas reservoir, which are favur of exploitation of tight gas resource. At the same time, heat fracturing spreads natural fractures and induces new fractures which make lost during drilling circulation. So heat fracturing brings the challenge and opportunity for exploration and exploitation of tight gas resource. |
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| Keywords: | thermal treatment tight rock peotrophsics water pahse trapping multiple scale mass transfer |
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