鄂尔多斯盆地延长组超低渗透油藏形成过程分析——以古峰庄—麻黄山地区为例
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摘要
鄂尔多斯盆地古峰庄—麻黄山地区长6、长8超低渗透油藏具有典型性和代表性。通过流体包裹体均一温度与沉积埋藏史—热史综合分析表明,古峰庄—麻黄山地区长6、长8油藏为一期成藏,成藏时间为早白垩世。成藏过程中,长7油源成藏早期向长8单向充注,成藏中期向长6、长8双向充注,成藏后期则向长6单向充注。成藏过程的这种动态变化主要由源储距离及其垂向组合关系、油源岩生烃高峰、储层边致密边成藏等成藏要素联合作用控制。
Oil reservoirs in Chang 6 and Chang 8 members of Yanchang Formation in Gufengzhuang-Mahuangshan area of Ordos Basin are typical ultra-low permeability reservoirs. Comprehensive analysis of homogenous temperatures of fluid inclusions and geothermal and burial history shows that oil accumulation of Chang 6 and Chang 8 members happened in early Cretaceous. During the oil accumulation petroleum generating from Chang 7 source rock only charged into Chang 8 reservoir at the early stage,then charged up and down into Chang 6 and Chang 8 at the middle stage,and only filled into Chang 6 reservoir at the late stage. The difference of accumulation process was controlled by the relationship between source and reservoir,and the peak time of hydrocarbon generation,and the reservoir tightness prior to the accumulation.
Oil reservoirs in Chang 6 and Chang 8 members of Yanchang Formation in Gufengzhuang-Mahuangshan area of Ordos Basin are typical ultra-low permeability reservoirs. Comprehensive analysis of homogenous temperatures of fluid inclusions and geothermal and burial history shows that oil accumulation of Chang 6 and Chang 8 members happened in early Cretaceous. During the oil accumulation petroleum generating from Chang 7 source rock only charged into Chang 8 reservoir at the early stage,then charged up and down into Chang 6 and Chang 8 at the middle stage,and only filled into Chang 6 reservoir at the late stage. The difference of accumulation process was controlled by the relationship between source and reservoir,and the peak time of hydrocarbon generation,and the reservoir tightness prior to the accumulation.
引文
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(1)顾岱鸿,周晓峰,王建国,等.姬塬西北部长6油藏建产潜力研究,长庆油田勘探开发研究院内部资料,2014.
(2)何顺利,周晓峰,王建国,等.盐池地区成藏规律及开发潜力研究,长庆油田勘探开发研究院内部资料,2014.
[2]史成恩,万晓龙,赵继勇,等.鄂尔多斯盆地超低渗透油层开发特征[J].成都理工大学学报:自然科学版,2007,34(5):538-542.[Shi Cheng’en,Wan Xiaolong,Zhao Jiyong,et al.Development characteristics of super-low permeability oil layers in Ordos Basin,China[J].Journal of Chengdu University of Technology:Science&Technology Edition,2007,34(5):538-542.]
[3]李书恒,赵继勇,崔攀峰,等.超低渗透储层开发技术对策[J].岩性油气藏,2008,20(3):128-131.[Li Shuheng,Zhao Jiyong,Cui Panfeng,et al.Strategies of development technology for ultralow permeability reservoir[J].Lithologic Reservoirs,2008,20(3):128-131.]
[4]屈红军,杨县超,曹金舟,等.鄂尔多斯盆地上三叠统延长组深层油气聚集规律[J].石油学报,2011,32(2):243-248.[Qu Hongjun,Yang Xianchao,Cao Jinzhou,et al.Oil accumulation rules in deep zones of Upper Triassic Yanchang Formation in Ordos Basin[J].Acta Petrolei Sinica,2011,32(2):243-248.]
[5]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.[Yao Jingli,Deng Xiuqin,Zhao Yande,et al.Characteristics of tight oil in Triassic Yanchang Formation,Ordos Basin[J].Petroleum Exploration and Development,2013,40(2):150-158.]
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[7]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.[Zhang Wenzheng,Yang Hua,Yang Yihua,et al.Petrology and element geochemistry and development environment of Yanchang Formation Chang-7 high quality source rocks in Ordos Basin[J].Geochimica,2008,37(1):59-64.]
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