辽西凹陷A油田特稠油油藏成因探讨
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摘要
辽西凹陷A油田在浅层发现大规模特稠油油藏,油藏具有油水倒置和油藏边界垂向上呈不规则弧形的特征。针对该特殊现象,利用流体包裹体、原油分析和盆地模拟等地质资料及手段,对其特稠油藏成因进行了分析。结果表明,稠油的形成主要与东营组的2期成藏和生物降解稠化作用密切相关,第1期东营组储层成藏之后遭受了初次降解作用,原油物性变差,降低了对盖层条件的要求,并在第2个成藏期受破坏,运移至浅层,再次经历快速降解作用,在差保存条件下形成大规模的聚集。
A large scale of heavy oil reservoir was discovered in the shallow layer of A Oilfield in Liaoxi Depression,and the reservoir was characterized by the inversion of oil and water and the irregular arc of the reservoir boundary.In view of these special characters,geological data and methods such as fluid inclusion,crude oil analysis and basin simulation were used in this paper,and the geneses of the super-heavy oil reservoirs were analyzed.The results show that the formation of heavy oil is closely related to the two phases of hydrocarbon accumulation and biodegradation and thickening in Dongying Formation.The initial degradation is induced after the hydrocarbon accumulation at the first stage of the Dongying Formation,and the crude oil property becomes poor,which reduces the requirements for the caprock condition,and it is destroyed and moved to the shallow layer during the second accumulation period,and experiences a rapid degradation again.Under the condition of differential preservation,a large scale aggregation is formed.
A large scale of heavy oil reservoir was discovered in the shallow layer of A Oilfield in Liaoxi Depression,and the reservoir was characterized by the inversion of oil and water and the irregular arc of the reservoir boundary.In view of these special characters,geological data and methods such as fluid inclusion,crude oil analysis and basin simulation were used in this paper,and the geneses of the super-heavy oil reservoirs were analyzed.The results show that the formation of heavy oil is closely related to the two phases of hydrocarbon accumulation and biodegradation and thickening in Dongying Formation.The initial degradation is induced after the hydrocarbon accumulation at the first stage of the Dongying Formation,and the crude oil property becomes poor,which reduces the requirements for the caprock condition,and it is destroyed and moved to the shallow layer during the second accumulation period,and experiences a rapid degradation again.Under the condition of differential preservation,a large scale aggregation is formed.
引文
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[3]王飞龙,徐长贵,张敏,等.生物标志物定量叠加参数恢复法在渤海油田稠油油源对比中的应用[J].中国海上油气,2016,28(3):70~77.
[4]邓运华.渤海油区稠油成因探讨[J].中国海上油气,2006,18(6):361~366.
[5]徐长贵.渤海走滑转换带及其对大中型油气田形成的控制作用[J].地球科学,2016,41(9):1548~1560.
[6]龚再升,蔡东升,张功成.郯庐断裂对渤海海域东部油气成藏的控制作用[J].石油学报,2007,28(4):1~10
[7]李伟,任健,刘一鸣,等.辽东湾坳陷东部新生代构造发育与成因机制[J].地质科技情报,2015,34(6):58~64.
[8]朱伟林,王国纯,周毅.渤海油气资源浅析[J].石油学报,2000,21(3):1~8.
[9]邓运华,李建平.浅层油气藏的形成机理———以渤海油区为例[M].北京:石油工业出版社,2008:23~50.
[10]王军,周心怀,李建平,等.蓬莱9-1油田强烈生物降解原油油源对比方法研究[A].孟宪来.2013年学术年会论文摘要汇编[C].北京:中国地质学会,2013:368~370.
[11]陈红汉.油气成藏年代学研究进展[J].石油与天然气地质,2007,28(2):143~150.
[12]米立军.新构造运动与渤海海域上第三系大型油气田[J].中国海上油气(地质),2001,15(1):21~28.
[13]胡守志,张冬梅,唐静,等.稠油成因研究综述[J].地质科技情报,2009,28(2):94~97.
[14]王冰洁,徐长贵,吴奎,等.辽东湾坳陷LX油田浅层特稠油藏成藏过程及模式[J].现代地质,2016,30(3):663~671.
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