大庆长垣南部两翼葡萄花油层油气运移及聚集规律
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摘要
大庆长垣南部构造两翼葡萄花油层油气资源丰富,但油水分布复杂、油气聚集成藏规律认识不清,导致两翼油气资源探明率低、探明储量动用效果差。利用测井、地震、试油和地球化学分析数据,在系统油源对比基础上,结合断裂系统划分标定油源断裂,分析断裂与砂体配置关系对油气运移、聚集的控制,建立成藏模式。研究得出,大庆长垣南部葡萄花油层油主要来自于本地下伏青一段源岩,主要排烃期为明水组沉积末期及其后,因此,坳陷期形成、反转期继续活动的断层以及断陷期形成、坳陷期和反转期继续活动的断裂为主要油源断裂,油气沿油源断裂垂向运移至葡萄花油层,受砂体规模及断层侧向封闭性限制,油气在葡萄花油层中侧向运移距离较短;油源断裂为主要控藏断裂,宏观控制葡萄花油层油水平面分布,油源断裂与砂体空间配置控制着油气聚集层位及范围;油源断裂下盘、反向断阶、单斜式地垒和顺向断阶等高位断块为两翼有利油气聚集部位。
Putaohua reservoir is rich in oil and gas resources in the two wings of the South of Daqing Placanticline.The discovery rate of resources was low and proved reserves producing effect was poor in the two wings,because of complex oil/water distribution and inadequate understanding oil and gas accumulation pattern.Based on the detail oil-source correlation,through marking the oil-migrating faults with faults classification and analyzing the control of the allocation of faults and sand bodies to hydrocarbon migration and accumulation,the pattern of reservoirs forming is established in this paper.It's considered that the oil of Putaohua reservoir mainly comes from the local hydrocarbon source rock of K1qn1,and the key period of hydrocarbon expulsion is the late sediment stage of K2m and later.Consequently,the main oil-migrating faults are composed of two types:(1)faults forming in depression period and faulting in inversion period;(2)faults forming in faulted period and faulting in depression period and inversion period.The oil vertical migration to Putaohua reservoir happened along the oil-migration faults,and the distance of oil lateral migration was short because of the restriction of sand bodies scales and fault lateral sealing.Thus,the oil-migrating faults are main control faults of the reservoir,which control the oil/water distribution at plane,and the allocation of the oil-migrating faults and sand bodies controls the horizon and range of oil accumulation.The favorable area of hydrocarbon accumulation is high fault blocks next to the oil-migrating faults,including the footwall of oil-migrating faults,inversed fault terrace,monoclinic horst,and forward fault terrace.
Putaohua reservoir is rich in oil and gas resources in the two wings of the South of Daqing Placanticline.The discovery rate of resources was low and proved reserves producing effect was poor in the two wings,because of complex oil/water distribution and inadequate understanding oil and gas accumulation pattern.Based on the detail oil-source correlation,through marking the oil-migrating faults with faults classification and analyzing the control of the allocation of faults and sand bodies to hydrocarbon migration and accumulation,the pattern of reservoirs forming is established in this paper.It's considered that the oil of Putaohua reservoir mainly comes from the local hydrocarbon source rock of K1qn1,and the key period of hydrocarbon expulsion is the late sediment stage of K2m and later.Consequently,the main oil-migrating faults are composed of two types:(1)faults forming in depression period and faulting in inversion period;(2)faults forming in faulted period and faulting in depression period and inversion period.The oil vertical migration to Putaohua reservoir happened along the oil-migration faults,and the distance of oil lateral migration was short because of the restriction of sand bodies scales and fault lateral sealing.Thus,the oil-migrating faults are main control faults of the reservoir,which control the oil/water distribution at plane,and the allocation of the oil-migrating faults and sand bodies controls the horizon and range of oil accumulation.The favorable area of hydrocarbon accumulation is high fault blocks next to the oil-migrating faults,including the footwall of oil-migrating faults,inversed fault terrace,monoclinic horst,and forward fault terrace.
引文
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[15]陈骁,李忠权,陈均亮,等.松辽盆地反转期的界定[J].地质通报,2010,29(2/3):305-311.
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[17]王有功,付广,刘阿男,等.源外斜坡区断裂对油气聚集与分布的控制作用研究——以松辽盆地尚家油田扶余、杨大城子油层为例[J].地质论评,2011,57(1):101-108.
[18]罗群,姜振学,庞雄奇.断裂控藏机理与模式[M].北京:石油工业出版社,2007:1-52.
[2]袁选俊,薛良清,池英柳,等.坳陷型湖盆层序地层特征与隐蔽油气藏勘探——以松辽盆地为例[J].石油学报,2003,24(3):11-15.
[3]吴河勇,梁晓东,向才富.松辽盆地向斜油藏特征及成藏机理探讨[J].中国科学:D辑,2007,37(2):185-191.
[4]赵文智,邹才能,汪泽成,等.富油气凹陷“满凹含油”论——内涵与意义[J].石油勘探与开发,2004,31(2):5-13.
[5]刘宗堡,马世忠,吕延防,等.大型凹陷斜坡带油气成藏模式——以三肇凹陷葡萄花油层为例[J].吉林大学学报:地球科学版,2008,38(6):937-945.
[6]付广,雷琳.油源区内外断裂控藏作用差异性研究——以松辽盆地三肇凹陷和长10区块扶余—杨大城子油层为例[J].地质论评,2010,56(5):719-725.
[7]张雷,卢双舫,张学娟,等.松辽盆地三肇地区扶杨油层油气成藏过程主控因素及成藏模式[J].吉林大学学报:地球科学版,2010,40(3):492-501.
[8]付晓飞,平贵东,范瑞东,等.三肇凹陷扶杨油层油气“倒灌”运聚成藏规律研究[J].沉积学报,2009,27(3):558-565.
[9]张文起,车廷信,王长生,等.松辽盆地葡萄花油田北部鞍部地区成藏控制因素分析[J].现代地质,2008,22(4):599-605.
[10]王建功,王天琦,梁苏娟,等.松辽盆地北部葡萄花油层浅水湖泊三角洲沉积特征及对油气分布的控制[J].中国石油勘探,2008,13(1):11-16.
[11]楼章华,袁笛,金爱民.松辽盆地北部浅水三角洲前缘砂体类型、特征与沉积动力学过程分析[J].浙江大学学报:理学版,2004,31(2):211-215.
[12]周永炳.齐家油田扶余油层成藏主控因素及有效开发配套技术研究[D].大庆:大庆石油学院,2009:132.
[13]侯启军,冯志强,冯子辉.松辽盆地陆相石油地质学[M].北京:石油工业出版社,2009:460-484.
[14]薛海涛,王欢欢,卢双舫,等.碳酸盐岩油源岩有机质丰度分级评价标准[J].沉积学报,2007,25(5):782-786.
[15]陈骁,李忠权,陈均亮,等.松辽盆地反转期的界定[J].地质通报,2010,29(2/3):305-311.
[16]胡望水,吕炳全,张文军,等.松辽盆地构造演化及成盆动力学探讨[J].地质科学,2005,40(1):16-31.
[17]王有功,付广,刘阿男,等.源外斜坡区断裂对油气聚集与分布的控制作用研究——以松辽盆地尚家油田扶余、杨大城子油层为例[J].地质论评,2011,57(1):101-108.
[18]罗群,姜振学,庞雄奇.断裂控藏机理与模式[M].北京:石油工业出版社,2007:1-52.
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