鄂尔多斯盆地中生界石油地质条件、资源潜力及勘探方向
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摘要
鄂尔多斯盆地中生界油气资源丰富,三叠系延长组和侏罗系延安组是主力含油层系。在鄂尔多斯盆地石油地质条件研究的基础上,提出沉积相、输导体系、异常压力和构造为中生界成藏的主要控制因素,建立了三叠系延长组大型岩性油藏模式和侏罗系古地貌控藏模式,并结合盆地勘探成果,精细评价了鄂尔多斯盆地石油地质资源量,预测了油气资源的空间分布。结果表明:鄂尔多斯盆地石油地质资源量约为146.50×10~8 t,其中常规油资源量为116.50×10~8 t,致密油资源量为30.00×10~8 t;按层系分,三叠系石油资源量为137.20×10~8 t,侏罗系石油资源量为9.30×10~8 t。盆地剩余资源量为96.93×10~8 t,姬塬、陇东和志靖—安塞等地区,是长庆油田的规模储量区,仍然是未来勘探的主要区域。延长组长6、长8油层组和侏罗系是下一步勘探的重点层系;延长组下部的长9、长10油层组为新的目标层系;长7油层组致密油具有较大的勘探潜力。
The Triassic Yanchang Formation and the Jurassic Yan'an Formation are the main oil-bearing strata in Ordos Basin. Based on the study of petroleum geological conditions in Ordos Basin, sedimentary facies, oil immigration pathway, abnormal pressure, and tectonics are proposed as controlling factors of Mesozoic oil reservoir. The patterns of the Triassic oil accumulation in large-scale deltas and the Jurassic oil accumulation controlled by paleo-geomorphology are setup. Combining with the oil exploration results of the basin, the quantity and the spatial distribution of oil resource are predicted with the "layer zone" as the basic unit of resource evaluation. The results show that the amount of oil resource is 146.50×10~8 t, including 116.50×10~8 t of conventional oil and 30.00×10~8 t of tight oil. With respect to strata, the amounts of oil resources of the Triassic and the Jurassic are 137.20×10~8 t(including 30.00×10~8 t of tight oil) and 9.30×10~8 t respectively. The amount of the remaining oil resource is 96.93×10~8 t, most of which are distributed in Jiyuan, Longdong,and Zhijing-Ansai areas. Chang 6 and Chang 8 of the Yanchang Formation and the Jurassic are key strata for oil exploration in the future; Chang 9 and Chang 10 in the lower part of the Yanchang Formation are new target strata; the tight oil of Chang 7 has great potential for next exploration.
The Triassic Yanchang Formation and the Jurassic Yan'an Formation are the main oil-bearing strata in Ordos Basin. Based on the study of petroleum geological conditions in Ordos Basin, sedimentary facies, oil immigration pathway, abnormal pressure, and tectonics are proposed as controlling factors of Mesozoic oil reservoir. The patterns of the Triassic oil accumulation in large-scale deltas and the Jurassic oil accumulation controlled by paleo-geomorphology are setup. Combining with the oil exploration results of the basin, the quantity and the spatial distribution of oil resource are predicted with the "layer zone" as the basic unit of resource evaluation. The results show that the amount of oil resource is 146.50×10~8 t, including 116.50×10~8 t of conventional oil and 30.00×10~8 t of tight oil. With respect to strata, the amounts of oil resources of the Triassic and the Jurassic are 137.20×10~8 t(including 30.00×10~8 t of tight oil) and 9.30×10~8 t respectively. The amount of the remaining oil resource is 96.93×10~8 t, most of which are distributed in Jiyuan, Longdong,and Zhijing-Ansai areas. Chang 6 and Chang 8 of the Yanchang Formation and the Jurassic are key strata for oil exploration in the future; Chang 9 and Chang 10 in the lower part of the Yanchang Formation are new target strata; the tight oil of Chang 7 has great potential for next exploration.
引文
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[12]杨华,张文正.论鄂尔多斯盆地长7段优质油源岩在低渗透油气成藏富集中的主导作用:地质地球化学特征[J].地球化学,2005,34(2):147-154.
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[14]张文正,杨华,李剑锋,等.论鄂尔多斯盆地长7段优质油源岩在低渗透油气成藏富集中的主导作用:强生排烃特征及机理分析[J].石油勘探与开发,2006,33(3):289-293.
[15]张文正,杨华,杨奕华,等.鄂尔多斯盆地长7优质烃源岩的岩石学、元素地球化学特征及发育环境[J].地球化学,2008,37(1):59-64.
[16]范玉海,屈红军,王辉,等.鄂尔多斯盆地西部延长组下组合异常压力与油气分布[J].新疆石油地质,2013,34(1):14-16.
[17] ZHAO Yande, YAO Jingli, SUN Bainian, et al. The characteristics and geological significance of fluorescence for sandstone grains and hydrocarbon extracts from Triassic and Jurassic low permeability reservoirs in Tianhuan Depression of the Ordos Basin, China[J]. Acta geologica sinica, 2014,88(6):1801-1814.
[18]吕振华,齐亚林,孟令涛.鄂尔多斯盆地西北部地区侏罗系成藏主控因素研究[J].新疆石油天然气,2016,12(1):19-24.
[19]刘显阳,邓秀芹,赵彦德,等.姬塬地区长9油层组油气运移规律及模式探讨[J].岩性油气藏,2011,23(5):9-15.
[20]楚美娟,李士祥,刘显阳,等.鄂尔多斯盆地延长组长8油层组石油成藏机理及成藏模式[J].沉积学报,2013,31(4):683-692.
[21]姚泾利,邓秀芹,赵彦德,等.鄂尔多斯盆地延长组致密油特征[J].石油勘探与开发,2013,40(2):150-158.
[22]姚泾利,赵彦德,邓秀芹,等.鄂尔多斯盆地延长组致密油形成控制因素研究[J].吉林大学学报(地球科学版),2015,45(4):983-992.
[2]赵彦德,齐亚林,罗安湘,等.应用流体包裹体和自生伊利石测年重构鄂尔多斯盆地侏罗系油藏烃类充注史[J].吉林大学学报(地球科学版),2016,46(6):1637-1648.
[3]段毅,张胜斌,郑朝阳,等.鄂尔多斯盆地马岭油田延安组原油成因研究[J].地质学报,2007,81(10):1407-1415.
[4] ZHAO Yande, SUN Bainian, DUAN Yi, et al. Characteristics and geological significance of fluorescence for sandstone grains and hydrocarbon extracts from low permeability reservoirs in the Ordos Basin, China[J]. Arabian journal of geosciences, 2015, 8(12):10213-10223.
[5]宋凯,吕剑文,凌升阶,等.鄂尔多斯盆地定边—吴旗地区前侏罗系古地貌与油藏[J].古地理学报,2003,5(4):497-507.
[6]郭正权,张立荣,楚关娟,等.鄂尔多斯盆地南部前侏罗纪古地貌对延安组下部油藏的控制作用[J].古地理学报,2008,10(1):63-71.
[7]姚泾利,赵彦德,刘广林,等.鄂尔多斯盆地三叠系长9段多源成藏模式与富集规律[J].石油勘探与开发,2018,45(3):1-11.
[8]李士祥,邓秀芹,庞锦莲,等.鄂尔多斯盆地中生界油气成藏与构造运动的关系[J].沉积学报,2010,28(4):798-807.
[9]齐亚林,赵彦德,王克,等.鄂尔多斯盆地姬塬与黄陵地区长8段储层主控因素研究[J].石油实验地质,2015,37(3):334-340.
[10]赵彦德,刘显阳,张雪峰,等.鄂尔多斯盆地天环坳陷南段侏罗系原油油源分析[J].现代地质,2011,25(1):85-93.
[11]赵彦德,姚宜同,黄锦绣,等.鄂尔多斯盆地陇东地区三叠系延长组长3油层组石油运移与充注研究[J].现代地质,2014,28(4):832-840.
[12]杨华,张文正.论鄂尔多斯盆地长7段优质油源岩在低渗透油气成藏富集中的主导作用:地质地球化学特征[J].地球化学,2005,34(2):147-154.
[13]赵彦德,罗安湘,孙柏年,等.鄂尔多斯盆地西南缘三叠系烃源岩评价及油源对比[J].兰州大学学报(自然科学版),2012,48(3):1-6.
[14]张文正,杨华,李剑锋,等.论鄂尔多斯盆地长7段优质油源岩在低渗透油气成藏富集中的主导作用:强生排烃特征及机理分析[J].石油勘探与开发,2006,33(3):289-293.
[15]张文正,杨华,杨奕华,等.鄂尔多斯盆地长7优质烃源岩的岩石学、元素地球化学特征及发育环境[J].地球化学,2008,37(1):59-64.
[16]范玉海,屈红军,王辉,等.鄂尔多斯盆地西部延长组下组合异常压力与油气分布[J].新疆石油地质,2013,34(1):14-16.
[17] ZHAO Yande, YAO Jingli, SUN Bainian, et al. The characteristics and geological significance of fluorescence for sandstone grains and hydrocarbon extracts from Triassic and Jurassic low permeability reservoirs in Tianhuan Depression of the Ordos Basin, China[J]. Acta geologica sinica, 2014,88(6):1801-1814.
[18]吕振华,齐亚林,孟令涛.鄂尔多斯盆地西北部地区侏罗系成藏主控因素研究[J].新疆石油天然气,2016,12(1):19-24.
[19]刘显阳,邓秀芹,赵彦德,等.姬塬地区长9油层组油气运移规律及模式探讨[J].岩性油气藏,2011,23(5):9-15.
[20]楚美娟,李士祥,刘显阳,等.鄂尔多斯盆地延长组长8油层组石油成藏机理及成藏模式[J].沉积学报,2013,31(4):683-692.
[21]姚泾利,邓秀芹,赵彦德,等.鄂尔多斯盆地延长组致密油特征[J].石油勘探与开发,2013,40(2):150-158.
[22]姚泾利,赵彦德,邓秀芹,等.鄂尔多斯盆地延长组致密油形成控制因素研究[J].吉林大学学报(地球科学版),2015,45(4):983-992.
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