鄂尔多斯盆地苏里格地区盒8段天然气地球化学特征与气源对比
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摘要
本论文以长庆油田公司勘探开发研究院与成都理工大学协作科研课题《苏里格地区石炭-二叠系天然气富集区主控因素与成因》为依托,力图通过对鄂尔多斯盆地上古生界天然气的进一步勘探,更加明确苏里格地区上古生界天然气的分布规律,选择有利的勘探目标,不断扩大勘探成果,有必要用天然气有机地球化学技术对天然气的来源进行研究。这对于苏格里气田的产能建设具有重要意义。
此次在前人研究的基础上,对苏里格地区源岩有机质丰度、有机质类型、有机质成熟度进行系统的研究,从而对源岩的基本地化特征有了较为全面的认识,为客观评价盒8段资源奠定了基础。研究表明苏里格地区盒8段源岩有机碳含量高、成熟度高、分布广、厚度较大等特征。有机质类型主要为Ⅱ2和Ⅲ类型,有机质以陆生高等植物输入为主,水生低等生物来源较少,具有较好的烃源岩。
根据苏里格地区盒8段天然气组成和碳同位素变化特征分析研究表明苏里格地区盒8段天然气主要为煤成气,天然气成熟度处于成熟到高成熟阶段,同源不同期次的天然气混合使局部天然气发生单项性碳同位素倒转。
通过对天然气碳同位素、凝析油轻烃、储层沥青甾萜烷与源岩吸附轻烃的全烃地球化学特征的综合对比表明苏里格地区盒8段天然气主要来自于二叠系山西组与太原组的煤系暗色泥岩和煤岩,石炭系本溪组的暗色泥晶灰岩也有一定的贡献。
苏里格地区盒8段具有多源多期混合充注的特征,虽然经历多次构造抬升活动,但早期充注的天然气仍然得以保存,表明天然气成藏具有良好的保存的条件。
The thesis, relying on the coopration research "The causes and controlling factors of Sulige Carboniferous-Permian gas-riched areas" raised by Exploration and Development Institute of Changqing Oilfield Company and Chengdu University of Technology, attampt to difine the distribution of gas in the Upper Paleozoic in Sulige region more clearly, then choose favorable exploring targets and expand the exploration achievement, through further exploration towards the Upper Paleozoic gas in Ordos Basin. It is necessary to study the source of gas using geochemical techniques. This means significance to sulige field.
Based on the previous studies, systematic research has been conducted on the organic aboundance, the organic type and the organic maturity of He-8 members source rocks in Sulige region. Therefore, a more comprehensive acquaintance has been achieved on the basic geochemical characteristics of the source rocks. To evaluate the He 8 segment resources objectively, the foundation has been established. The results show that the He 8 segment source rocks in Sulige region have a high content of organic carbon and high maturity, most of which has entered a high maturity phase. It’s organic types are II2 and III mainly, and the organic matters were mostly input by the terrestrial higher plant, which has more hydrocarbon source rocks.
By comparing the carbon isotope of gas, light hydrocarbon condensate, bitumen-steroidal terpane and adsorption of light hydrocarbons in source rocks, show that the gas source Sulige Xiashihezi more complex. It’s organic types are II2 and III mainly, and the organic matters were mostly input by the terrestrial higher plant, natural gas is mainly coal-type gas causes,the whole is dry gas, moisture supplement. Sulige region Xiashihezi main producing formation in the oil and gas not only from coal shale, coal, and also contribute to dark micrite, are multi-source hybrid charging. Sulige region of accumulation of natural gas has many features. Even after several tectonic uplift events, early filling of gas is still preserved.
此次在前人研究的基础上,对苏里格地区源岩有机质丰度、有机质类型、有机质成熟度进行系统的研究,从而对源岩的基本地化特征有了较为全面的认识,为客观评价盒8段资源奠定了基础。研究表明苏里格地区盒8段源岩有机碳含量高、成熟度高、分布广、厚度较大等特征。有机质类型主要为Ⅱ2和Ⅲ类型,有机质以陆生高等植物输入为主,水生低等生物来源较少,具有较好的烃源岩。
根据苏里格地区盒8段天然气组成和碳同位素变化特征分析研究表明苏里格地区盒8段天然气主要为煤成气,天然气成熟度处于成熟到高成熟阶段,同源不同期次的天然气混合使局部天然气发生单项性碳同位素倒转。
通过对天然气碳同位素、凝析油轻烃、储层沥青甾萜烷与源岩吸附轻烃的全烃地球化学特征的综合对比表明苏里格地区盒8段天然气主要来自于二叠系山西组与太原组的煤系暗色泥岩和煤岩,石炭系本溪组的暗色泥晶灰岩也有一定的贡献。
苏里格地区盒8段具有多源多期混合充注的特征,虽然经历多次构造抬升活动,但早期充注的天然气仍然得以保存,表明天然气成藏具有良好的保存的条件。
The thesis, relying on the coopration research "The causes and controlling factors of Sulige Carboniferous-Permian gas-riched areas" raised by Exploration and Development Institute of Changqing Oilfield Company and Chengdu University of Technology, attampt to difine the distribution of gas in the Upper Paleozoic in Sulige region more clearly, then choose favorable exploring targets and expand the exploration achievement, through further exploration towards the Upper Paleozoic gas in Ordos Basin. It is necessary to study the source of gas using geochemical techniques. This means significance to sulige field.
Based on the previous studies, systematic research has been conducted on the organic aboundance, the organic type and the organic maturity of He-8 members source rocks in Sulige region. Therefore, a more comprehensive acquaintance has been achieved on the basic geochemical characteristics of the source rocks. To evaluate the He 8 segment resources objectively, the foundation has been established. The results show that the He 8 segment source rocks in Sulige region have a high content of organic carbon and high maturity, most of which has entered a high maturity phase. It’s organic types are II2 and III mainly, and the organic matters were mostly input by the terrestrial higher plant, which has more hydrocarbon source rocks.
By comparing the carbon isotope of gas, light hydrocarbon condensate, bitumen-steroidal terpane and adsorption of light hydrocarbons in source rocks, show that the gas source Sulige Xiashihezi more complex. It’s organic types are II2 and III mainly, and the organic matters were mostly input by the terrestrial higher plant, natural gas is mainly coal-type gas causes,the whole is dry gas, moisture supplement. Sulige region Xiashihezi main producing formation in the oil and gas not only from coal shale, coal, and also contribute to dark micrite, are multi-source hybrid charging. Sulige region of accumulation of natural gas has many features. Even after several tectonic uplift events, early filling of gas is still preserved.
引文
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[3]张晓宝,徐永昌.国外天然气地球化学研究与应用新进展[J].天然气地球科学,1999,10(5)
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[10]付金华等.鄂尔多斯盆地上古生界天然气成藏地质特征及勘探方法[J].中国石油勘探,2001,6(4):68-75
[11]尹志军等.苏里格气田苏6井区盒8段沉积相研究.天然气工业[J].2006,26(3):26-27
[12]沈玉林等.鄂尔多斯盆地苏里格庙地区二叠系山西组及下石盒子组盒八段沉积相[J].古地理学报,2006,8(1):53-62
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[15]杨华等.鄂尔多斯盆地古生界含气系统特征[J].天然气工业,2000
[16]文华国等.苏里格气田苏6井区下石盒子组盒8段沉积相特征[J].沉积学报,2007,25(1):90-97
[17]李海燕,彭仕宓.苏里格气田低渗透储层成岩储集相特征[J].石油学报,2007,28(3):100-106
[18]朱筱敏,刘成林.苏里格地区上古生界有效储层的确定[J].天然气工业,2006,26(9):1-3
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[20]杨晓萍,赵文智等.川中气田与苏里格气田“甜点”储层对比研究[J].天然气工业,2007,27(1):4-7
[21]宋岩,徐永吕.天然气成因类型及其鉴别[J].石油勘探与开发,2005,32(4):24-29
[22]王强,付晓文,徐志明等.稳定碳同位素在油气地球化学中的应用与进展[J].天然气地球化学,2005,16(2):233-237
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