长岭断陷龙凤山—东岭地区下白垩统天然气地球化学特征及成因
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摘要
针对龙凤山—东岭地区下白垩统天然气地球化学特征及成因类型不明确的问题,基于天然气组分、碳同位素等地球化学数据,结合天然气成藏地质背景,对原油裂解气及干酪根裂解气进行划分,进而探讨其分布特征。结果表明,龙凤山地区下白垩统天然气具有甲烷含量低、非烃含量高、稳定碳同位素值大等特征;而东岭地区下白垩统天然气具有甲烷含量高、非烃含量低、稳定碳同位素值小等特征。通过分析天然气地球化学特征的差异,认为研究区下白垩统天然气为混合气,其中龙凤山地区营城组天然气主要为干酪根裂解气,东岭地区沙河子组和泉头组天然气主要为原油裂解气,营城组天然气为原油裂解气和干酪根裂解气的混合气。总体来看,研究区下白垩统原油裂解气主要分布在洼陷带,而干酪根裂解气分布在斜坡带,且龙凤山地区仅在营城组富集,东岭地区多层系富集成藏。研究成果对龙凤山—东岭地区下一步油气勘探工作具有一定参考意义。
Based on the natural gas components and carbon isotope and other geochemical test data,the geological setting of natural gas accumulation was considered to clarify the geochemical properties and genesis of the Lower Cretaceous natural gas in Longfengshan-Dongling,Changling Fault-Depression. The oil cracking gas and kerogen cracking gas were separated to explore their distribution patterns. Research indicates that the Lower Cretaceous natural gas in Longfengshan is characterized by low methane content,high non-hydrocarbon content and high stable carbon isotope value. The Lower Cretaceous natural gas in Dongling is characterized by high methane content,low non-hydrocarbon content and low stable carbon isotope value. The Lower Cretaceous natural gas in this region is considered as mixed gas according to the geochemical property difference. The natural gas in the Yingcheng Formation of Longfengshan is perceived as kerogen cracking gas. The natural gas in the Shahezi Formation and Quantou Formation in Dongling are classified as crude oil cracking gas and the natural gas in the Yingcheng Formation is considered as a mixed gas of crude oil cracking gas and kerogen cracking gas. Generally,the crude oil cracking gas mainly distributes in the depression zones,while the kerogen cracking gas mainly distributes in the slop zones. Natural gas only accumulates in the Yingcheng Formation in Longfengshan and natural gas accumulates in multiple stratum series in Dongling. This research could provide certain reference for the further hydrocarbon exploration in Longfengshan-Dongling.
Based on the natural gas components and carbon isotope and other geochemical test data,the geological setting of natural gas accumulation was considered to clarify the geochemical properties and genesis of the Lower Cretaceous natural gas in Longfengshan-Dongling,Changling Fault-Depression. The oil cracking gas and kerogen cracking gas were separated to explore their distribution patterns. Research indicates that the Lower Cretaceous natural gas in Longfengshan is characterized by low methane content,high non-hydrocarbon content and high stable carbon isotope value. The Lower Cretaceous natural gas in Dongling is characterized by high methane content,low non-hydrocarbon content and low stable carbon isotope value. The Lower Cretaceous natural gas in this region is considered as mixed gas according to the geochemical property difference. The natural gas in the Yingcheng Formation of Longfengshan is perceived as kerogen cracking gas. The natural gas in the Shahezi Formation and Quantou Formation in Dongling are classified as crude oil cracking gas and the natural gas in the Yingcheng Formation is considered as a mixed gas of crude oil cracking gas and kerogen cracking gas. Generally,the crude oil cracking gas mainly distributes in the depression zones,while the kerogen cracking gas mainly distributes in the slop zones. Natural gas only accumulates in the Yingcheng Formation in Longfengshan and natural gas accumulates in multiple stratum series in Dongling. This research could provide certain reference for the further hydrocarbon exploration in Longfengshan-Dongling.
引文
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[14]李艳霞.原油裂解气和干酪根裂解气的判识[J].西安石油大学学报(自然科学版),2008,23(6):42-45.
[15]李剑,李志生,王晓波,等.多元天然气成因判识新指标及图版[J].石油勘探与开发,2017,44(4):503-512.
[16]王民,卢双舫,李吉君,等川东北地区飞仙关组气藏两种气源生气史及相对贡献[J].石油勘探与开发,2010,37(2):167-173.
[17]卢双舫,付晓泰,刘晓艳,等.油成气的动力学模型及其标定[J].天然气工业,1996,17(6):6-8.
[18]蒋有录,胡洪瑾,谈玉明,等.东濮凹陷北部地区古近系油型气成因类型及分布特征[J].中国石油大学学报(自然科学版),2017,41(3):42-48.
[19]张同伟,王先彬,陈践发,等.天然气运移的气体组分的地球化学示踪[J].沉积学报,1999,17(4):627-632.
[2]李浩,陆建林,王保华,等.长岭断陷南部地区断陷层油气成藏机制及勘探潜力[J].中国石油大学学报(自然科学版),2016,40(3):44-54.
[3]秦都,黄桂雄,李瑞磊,等.松辽盆地南部断陷层碎屑岩天然气成藏主控因素分析---以长岭断陷龙凤山次凹为例[J].中国石油勘探,2016,21(3):52-61.
[4]许娟娟.长岭断陷龙凤山次凹烃源岩评价及资源潜力分析[D].青岛:中国石油大学(华东),2016.
[5]范婕,蒋有录,刘景东,等.松辽盆地长岭断陷龙凤山地区油气分布有序性及其主控因素[J].天然气工业,2018,38(5):52-60.
[6]周荔青,雷一心.松辽盆地断陷层系大、中型油气田形成条件及勘探方向[J].石油与天然气地质,2006,27(6):820-826.
[7]肖永军,徐佑德,段晓艳,等.长岭断陷东岭地区火石岭组油气成藏特征分析[J].天然气地球科学,2012,23(4):720-726.
[8]陆建林,张玉明,徐宏节,等.松辽盆地长岭断陷火山岩储层形成特征研究[J].石油实验地质,2009,31(5):441-448.
[9]范婕,蒋有录,刘景东,等.长岭断陷龙凤山地区断裂与油气运聚的关系[J].地球科学,2017,42(10):1817-1829.
[10]戴金星,戚厚发,宋岩.鉴别煤成气和油型气若干指标的初步探讨[J].石油学报,1985,6(2):31-38.
[11]戴金星.煤成气及鉴别理论研究进展[J].科学通报,2018,63(14):1291-1305.
[12]胡国艺,肖中尧,罗霞,等.两种裂解气中轻烃组成差异性及其应用[J].天然气工业,2005,25(9):23-25,150.
[13]PRINZHOFER A A,HUC A Y.Genetic and post-genetic molecular and isotopic fractionations in natural gases[J].Chemical Geology,1995,126(3):281-290.
[14]李艳霞.原油裂解气和干酪根裂解气的判识[J].西安石油大学学报(自然科学版),2008,23(6):42-45.
[15]李剑,李志生,王晓波,等.多元天然气成因判识新指标及图版[J].石油勘探与开发,2017,44(4):503-512.
[16]王民,卢双舫,李吉君,等川东北地区飞仙关组气藏两种气源生气史及相对贡献[J].石油勘探与开发,2010,37(2):167-173.
[17]卢双舫,付晓泰,刘晓艳,等.油成气的动力学模型及其标定[J].天然气工业,1996,17(6):6-8.
[18]蒋有录,胡洪瑾,谈玉明,等.东濮凹陷北部地区古近系油型气成因类型及分布特征[J].中国石油大学学报(自然科学版),2017,41(3):42-48.
[19]张同伟,王先彬,陈践发,等.天然气运移的气体组分的地球化学示踪[J].沉积学报,1999,17(4):627-632.