天然气的分类

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<p align="center" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 26pt; TEXT-ALIGN: center; mso-line-height-rule: exactly;"><b><span lang="EN-US" style="FONT-SIZE: 18pt; FONT-FAMILY: Arial;"><p></p></span></b></p><p align="center" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 26pt; TEXT-ALIGN: center; mso-line-height-rule: exactly;"><b><span lang="EN-US" style="FONT-FAMILY: 仿宋_GB2312; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;"><p><font size="3"></font></p></span></b></p><p style="TEXT-JUSTIFY: inter-ideograph; MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 26pt; TEXT-ALIGN: justify; mso-line-height-rule: exactly;"><span style="FONT-FAMILY: 仿宋_GB2312; mso-hansi-font-family: Verdana; mso-bidi-font-family: Arial;"><font size="3">存在于地下自然生成的以甲烷（<span lang="EN-US">CH4</span>）为主的一种可燃气体称为天然气。天然气在我国分布很广，我国最早在四川自贡自流井使用天然气，已具有<span lang="EN-US">5000</span>年历史，是世界上最早发现和使用天然气的国家。<span lang="EN-US"><p></p></span></font></span></p><p style="TEXT-JUSTIFY: inter-ideograph; MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 26pt; TEXT-ALIGN: justify; mso-line-height-rule: exactly;"><span style="FONT-FAMILY: 仿宋_GB2312; mso-hansi-font-family: Verdana; mso-bidi-font-family: Arial;"><font size="3">根据开采和形成的方式不同，天然气可分为<span lang="EN-US">5</span>种：<span lang="EN-US"><p></p></span></font></span></p><p style="TEXT-JUSTIFY: inter-ideograph; MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 26pt; TEXT-ALIGN: justify; mso-line-height-rule: exactly;"><span style="FONT-FAMILY: 仿宋_GB2312; mso-hansi-font-family: Verdana; mso-bidi-font-family: Arial;"><font size="3">纯天然气：从地下开采出来的气田气为纯天然气<span lang="EN-US">,</span>其甲烷含量在<span lang="EN-US">90%</span>以上，其低热值约为<span lang="EN-US">33.47~36.40</span>兆焦<span lang="EN-US">/</span>标米<span lang="EN-US">3</span>（<span lang="EN-US">8000~8700</span>千卡<span lang="EN-US">/</span>标米<span lang="EN-US">3</span>）<span lang="EN-US">;<p></p></span></font></span></p><p style="TEXT-JUSTIFY: inter-ideograph; MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 26pt; TEXT-ALIGN: justify; mso-line-height-rule: exactly;"><span style="FONT-FAMILY: 仿宋_GB2312; mso-hansi-font-family: Verdana; mso-bidi-font-family: Arial;"><font size="3">石油伴生气：伴随石油开采一块出来的气体称为石油伴生气<span lang="EN-US">,</span>其低热值为<span lang="EN-US">37.66~46.02</span>兆焦<span lang="EN-US">/</span>标米<span lang="EN-US">3</span>（<span lang="EN-US">9000~11000</span>千卡<span lang="EN-US">/</span>标米<span lang="EN-US">3</span>）<span lang="EN-US">;<p></p></span></font></span></p><p style="TEXT-JUSTIFY: inter-ideograph; MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 26pt; TEXT-ALIGN: justify; mso-line-height-rule: exactly;"><span style="FONT-FAMILY: 仿宋_GB2312; mso-hansi-font-family: Verdana; mso-bidi-font-family: Arial;"><font size="3">矿井瓦斯：开采煤炭时采集的矿井气；<span lang="EN-US"><p></p></span></font></span></p><p style="TEXT-JUSTIFY: inter-ideograph; MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 26pt; TEXT-ALIGN: justify; mso-line-height-rule: exactly;"><span style="FONT-FAMILY: 仿宋_GB2312; mso-hansi-font-family: Verdana; mso-bidi-font-family: Arial;"><font size="3">煤层气：从井下煤层抽出的矿井气；<span lang="EN-US"><p></p></span></font></span></p><p style="TEXT-JUSTIFY: inter-ideograph; MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 26pt; TEXT-ALIGN: justify; mso-line-height-rule: exactly;"><span style="FONT-FAMILY: 仿宋_GB2312; mso-hansi-font-family: Verdana; mso-bidi-font-family: Arial;"><font size="3">凝析气田气：含石油轻质馏分的气体。<span lang="EN-US"><p></p></span></font></span></p><p style="TEXT-JUSTIFY: inter-ideograph; MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 26pt; TEXT-ALIGN: justify; mso-line-height-rule: exactly;"><span style="FONT-FAMILY: 仿宋_GB2312; mso-hansi-font-family: Verdana; mso-bidi-font-family: Arial;"><font size="3">为方便运输，天然气经过加工还可形成；<span lang="EN-US"><p></p></span></font></span></p><p style="TEXT-JUSTIFY: inter-ideograph; MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 26pt; TEXT-ALIGN: justify; mso-line-height-rule: exactly;"><span style="FONT-FAMILY: 仿宋_GB2312; mso-hansi-font-family: Verdana; mso-bidi-font-family: Arial;"><font size="3">压缩天然气：将天然气压缩增压至<chmetcnv wst="on" unitname="kg" sourcevalue="200" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">200kg</span></chmetcnv><span lang="EN-US">/cm2</span>时，天然气体积缩小<span lang="EN-US">200</span>倍，并储入容器中，便于汽车运输，经济运输半径以<span lang="EN-US">150-200</span>公里为妥。压缩天然气可用于民用及作为汽车清洁燃料；<span lang="EN-US"><p></p></span></font></span></p><p style="TEXT-JUSTIFY: inter-ideograph; MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 26pt; TEXT-ALIGN: justify; mso-line-height-rule: exactly;"><span style="FONT-FAMILY: 仿宋_GB2312;"><font size="3">液化天然气：天然气经过深冷液化，在<span lang="EN-US">-160</span>℃的情况下就变成液体成为液化天然气，用液化甲烷船及专用汽车运输。<span lang="EN-US"><p></p></span></font></span></p><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 仿宋_GB2312; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-bidi-font-size: 12.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"><br clear="all" style="PAGE-BREAK-BEFORE: always; mso-special-character: line-break;"/></span>