摘要
目前吴起地区开发的主力层位侏罗系延安组下组合(延7—延10层)和三叠系延长组上组合(长4+5层和长6层)已到中后期,亟需寻找新的接替层位和接替能源满足油田持续高效稳产的战略目标,三叠系延长组长7段页岩油作为吴起采油厂新的接替层位,具有较大的勘探开发价值。为探明长7页岩油烃源岩的特征及勘探潜力区,进行了岩心分析、测井曲线研究、岩石热解分析、镜检显微组分分析、镜体反射率(R_(o))测试和生排烃潜力计算。结果表明:长7烃源岩的丰度总体上较高,有机碳含量(TOC)主要分布在0.49%~41.02%。长7层有机质类型以Ⅰ型和Ⅱ型为主,生油能力强。烃源岩镜质组表明吴起地区处在成熟阶段,并且以生油为主,反射率R_(o)样品分布集中在0.50%~1.15%,长7段烃源岩生烃强度为(200~600)×10^(4)t/km^(2),排烃强度大多为(200~300)×10^(4)t/km^(2)。综合吴起地区烃源岩厚度和生排烃强度,将长7段页岩油勘探潜力区划分为Ⅰ类、Ⅱ类和Ⅲ类,吴页平1井勘探钻探试油结果证明,烃源岩勘探潜力区是有利的页岩油开发层系和接替层。该研究结果将为吴起地区页岩油下一步勘探开发指明方向。
At present,the primary layers produced in Wuqi Area are the lower combination of Jurassic Yan’an Formation(Yan7-Yan10 layers)and the upper combination of Triassic Yanchang Formation(Chang4+5 layers and Chang6 layer).It is urgent to find new replacement layers and replacement energy to meet the strategic goal of sustained,efficient and stable production of the oilfield.The shale oil of Chang7 layer of the Triassic Yanchang Formation as a new replacement layer for Wuqi Oil Production Plant has great exploration and development value.To study the characteristics and exploration potential area of Chang7 shale oil source rock,core analysis,logging curve research,rock pyrolysis analysis,microscopic maceral analysis,vitrinite reflectance(R_(o))test,and hydrocarbon generation and expulsion potential calculation were carried out.The results show that the abundance of Chang7 source rocks is generally high,and the tottal organic carbon(TOC)mainly ranges from 0.49%to 41.02%.The organic matters of Chang7 layer are primarily typeⅠand typeⅡ,with strong oil generation capacity.The R_(o)shows that the source rocks of Wuqi Area are in the mature stage and dominated by oil generation.Most sample R_(o)range from 0.50%to 1.15%,and the hydrocarbon generation intensity of Chang7 hydrocarbon source ranges from 200×10^(4)t/km^(2)to 600×10^(4)t/km^(2),hydrocarbon expulsion intensity mainly ranges from 200×10^(4)t/km^(2)to 300×10^(4)t/km^(2).Based on the thickness of source rocks and the intensity of hydrocarbon generation and expulsion in Wuqi Area,the shale oil exploration potential in Chang7 layer was divided into three categories:Ⅰ,ⅡandⅢ,the results of exploration drilling and production testing of well Wuyeping1 show that the source rock exploration potential area is a favorable shale oil development layer series and replacement layer.The results will point out the direction for the next exploration and development of shale oil in Wuqi Area.
作者
高攀明
GAO Panming(Wuqi Oil Production Plant of Yanchang Oilfield Co.,Ltd.,Shaanxi Yan’an 716000,China)
出处
《非常规油气》
2024年第3期10-18,共9页
Unconventional Oil & Gas
基金
延长油田股份有限公司项目“吴起油田王洼子地区侏罗系延安组和三叠系延长组新增探明储量”(YT21YKT-009-1)。
关键词
鄂尔多斯盆地
吴起地区
页岩油
烃源岩
长7段
地化特征
生排烃潜力
Ordos Basin
Wuqi Area
shale oil source rock
Chang7 layer
geochemical characteristics
hydrocarbon generation and expulsion potential
