CAJ | 학술논문

研究桂中盆地页岩气发育的地质条件并分析其勘探潜力。对桂中盆地近期一口页岩气钻井的产气特征和岩心开展了T O C、Ro 等测试分析。该井位于柳城县白芒村附近，钻进过程中在井深为248．33 m的下石炭统寺门组泥页岩层系砂岩夹层中出现井涌及天然气喷漏，日产气量3000～4000 m3，持续几天后无明显衰减迹象，揭示了良好的页岩气潜力。该井寺门组泥页岩TOC的质量分数为0．54％～1．59％，平均值为1．07％，为较好的烃源岩层；砂岩夹层中见丰富的沥青，其反射率Rb 为1．64％～2．1％。寺门组泥页岩烃源岩和沥青热裂解生气保证了泥页岩层系充足的气源供应。桂中盆地中下泥盆统和下石炭统深灰色或黑色泥页岩层系广泛发育，为高演化的优质烃源岩层并且具有较大的厚度，构成页岩气大规模赋存的基础地质条件。经过长期的油气勘探，已在不少钻井揭示页岩气的显示，展示了较好的页岩气勘探前景。
연구계중분지혈암기발육적지질조건병분석기감탐잠력。대계중분지근기일구혈암기찬정적산기특정화암심개전료T O C、Ro 등측시분석。해정위우류성현백망촌부근，찬진과정중재정심위248．33 m적하석탄통사문조니혈암층계사암협층중출현정용급천연기분루，일산기량3000～4000 m3，지속궤천후무명현쇠감적상，게시료량호적혈암기잠력。해정사문조니혈암TOC적질량분수위0．54％～1．59％，평균치위1．07％，위교호적경원암층；사암협층중견봉부적력청，기반사솔Rb 위1．64％～2．1％。사문조니혈암경원암화력청열렬해생기보증료니혈암층계충족적기원공응。계중분지중하니분통화하석탄통심회색혹흑색니혈암층계엄범발육，위고연화적우질경원암층병차구유교대적후도，구성혈암기대규모부존적기출지질조건。경과장기적유기감탐，이재불소찬정게시혈암기적현시，전시료교호적혈암기감탐전경。
The purpose of this study is concentrated on the geological conditions forming shale gas and the analysis of exploration potential in Central Guangxi basin.The authors investigated the shale gas producing characteristics from a well in Central Guangxi basin and analyzed TOC and Ro of shale cores from this well.The well lies near Baimang of Liucheng County,Guangxi.The gas comes from a silt sand interlayer in the Lower Carboniferous Simen Formation (C1s)at a depth of about 248.33 m.The amount of gas released from the well is estimated at 3000 ~4000 m3 per day. This further demonstrates that there is good shale gas potential.The TOC mass fraction of the shale samples from this well is 0.54%~1.59%with the average 1.07%.The reflection of bitumen (Rb)in the sandstone samples is 1.64%~2.10%.The mud shale hydrocarbon source rocks and the thermal crack of bitumen in sandstones ensure the supply of gases from the mud shale sequences.The Devonian and Carboniferous dark mud shale sequences are extensively developed with relatively big thickness.They are high quality hydrocarbon source rocks.After a long-term hydrocarbon exploration,many wells discover the existence of shale gas,demonstrating a good prospect for shale gas exploration.The thick mud shale and sandstone interlayers with high porosity contribute to the reservoirs of shale gas.