CAJ | 학술논문

龙泉山是具备油气生储盖组合的含油气构造，出露侏罗系和白垩系非煤系地层，有7个构造高点，节理裂隙发育，是浅层天然气有利聚集区，沙溪庙组砂岩是浅层天然气主要储层。已建达成铁路炮台山隧道和成－简快速通道龙泉山2＃隧道在施工中都出现浅层天然气燃烧和爆炸现象。拟建的成洛大道东延线、成安渝高速公路和成渝客专又将以隧道方式通过龙泉山含油气构造，故研究浅层天然气对隧道危害有重要意义。通过现场8座隧道共20个钻孔天然气浓度测试，发现8座隧道均有浅层天然气显示，天然气最高浓度8.654％，最低浓度0.081％，8座隧道均受到天然气危害。研究表明，隧道所处构造位置和地层岩性是隧道受浅层天然气危害大小的主要影响因素，隧道离含油气构造高点越近，在穿越裂隙发育的地层时，其钻孔天然气浓度越高，隧道受浅层天然气危害越大。
룡천산시구비유기생저개조합적함유기구조，출로주라계화백성계비매계지층，유7개구조고점，절리렬극발육，시천층천연기유리취집구，사계묘조사암시천층천연기주요저층。이건체성철로포태산수도화성－간쾌속통도룡천산2＃수도재시공중도출현천층천연기연소화폭작현상。의건적성락대도동연선、성안투고속공로화성투객전우장이수도방식통과룡천산함유기구조，고연구천층천연기대수도위해유중요의의。통과현장8좌수도공20개찬공천연기농도측시，발현8좌수도균유천층천연기현시，천연기최고농도8.654％，최저농도0.081％，8좌수도균수도천연기위해。연구표명，수도소처구조위치화지층암성시수도수천층천연기위해대소적주요영향인소，수도리함유기구조고점월근，재천월렬극발육적지층시，기찬공천연기농도월고，수도수천층천연기위해월대。
The oil and gas structures at Longquan Mountains have the full combination including generation, reservoir and cap rock.The Jurassic and Cretaceous are non-coal strata.There are seven structural heights and jointed fracture zones which are favorable to gather shallow gas.The sandstone of Shaximiao formation is the primary reservoir of the shallow gas.It is so easy to generate engineering accidents when tunneling across the layer.The tunneling would be harmed by enriched shallow gas.There are three lines including the east extension of Cheng-Luo highway,the Cheng-An-Yu expressway and the Cheng-Yu railway.The analyses of gas concentrations that come from twenty drillings of eight tunnels show that the eight tunnels have gas presence.The highest gas concentration is 8.654%and the lowest gas concentration is 0.081%,which reveal that the eight tunnels have been affected by the gas.The present study has found that the main influencing factors of the tunnels are structure location and rock properties.Tunneling would be harmed when it is near the high point of oil and gas structures or passes the fractured formations with high concentration gas.