| 川东北元坝地区中浅层天然气气源及成因类型 |
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| 引用本文： | 刘若冰,郭彤楼,邵明莉.川东北元坝地区中浅层天然气气源及成因类型[J].天然气工业,2011,31(6):34-38. |
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| 作者姓名： | 刘若冰 郭彤楼 邵明莉 |
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| 作者单位： | 1.中国石化勘探南方分公司；2.中国石化胜利油田分公司 |
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| 摘 要： | 川东北元坝地区中浅层（中三叠统雷口坡组及其以上地层）正在逐渐成为四川盆地天然气勘探的重要接替领域之一，由于该区油气系统错综复杂，查明其油气源及天然气成因类型，便显得尤为重要。为此，在分析该区烃源岩分布及地化指标的基础上，重点研究了天然气组成、碳氢同位素组成、硫化氢含量等地球化学特征，结合地层压力、断裂系统分布等地质特征，初步确定了该区中浅层天然气的来源：来自陆相地层本身，而非海相气源；自流井组为“自生自储”成藏模式，雷口坡组属于“倒灌”成藏模式。并根据目前应用较广泛的ln（C2/C3）-ln（C1/C2）等关系图版，基本明确了该区中浅层天然气的成因类型：中浅层天然气主要由干酪根直接裂解形成，但自流井组天然气中存在少量原油二次裂解所形成的天然气。
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| 关 键 词： | 元坝地区 烃源岩 气源 干酪根裂解气 原油裂解气 碳同位素 氢同位素 四川盆地 |
Sources and genetic types of gas in the middle-shallow strata of the Yuanba area,northeastern Sichuan Basin |
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| Liu Ruobing
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Guo Tonglou
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Shao Mingli.Sources and genetic types of gas in the middle-shallow strata of the Yuanba area,northeastern Sichuan Basin[J].Natural Gas Industry,2011,31(6):34-38. |
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| Authors: | Liu Ruobing Guo Tonglou Shao Mingli |
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| Affiliation: | 1.Sinopec South Exploration Company, Chengdu, Sichuan 610041, China; 2.Sinopec Shengli Oilfield Company, Dongying, Shandong 257000, China |
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| Abstract: | The middle-shallow strata(the Middle Triassic Leikoupo Formation and its overlaying strata) in the Yuanba area,northeastern Sichuan Basin,are becoming the important alternative targets for gas exploration in the Sichuan Basin.As the petroleum system is very complex,it is especially important to recognize the sources and genetic types of gas in the study area.Therefore,based on an analysis of source rock distribution and geochemical indexes,the gas composition,carbon and hydrogen isotopic components,the cont... |
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| Keywords: | Yuanba area source rock gas source kerogen cracking crude oil cracking carbon isotope hydrogen isotope Sichuan Basin |
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