东营凹陷胜坨地区沙河街组沉积体系及其油气源特征
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摘要
古近系沙河街组是东营凹陷胜坨地区最重要的储集层段。利用岩心观察、扫描电镜、岩心分析化验资料和地震资料对胜坨地区古近系沙河街组沉积特征及其油气源特征进行了研究。结果表明,东营凹陷北部陡坡带发育不同成因类型的砂砾岩群体,在平面上沿胜坨北部陡坡带呈裙带状分布,优质储层主要发育在中扇辫状水道砂体中。胜坨地区各类砂砾岩扇体油藏受断裂活动和生烃系统的双重控制,形成了在平面上由下降盘、断裂带到上升盘依次分布岩性油气藏、构造油气藏、地层型油气藏。油源对比结果表明,深层沙四段岩性油气藏和部分沙三中上构造岩性油气藏中的原油来自于沙四段成熟烃源岩。胜北断层上升盘的地层油藏中,以低成熟稠油为主,生物标志物体现出沙三上烃源岩特征;在下降盘沙三段储层中的原油来自沙三下烃源岩,中—浅层(沙三中—沙二)有大量原油来自于沙三和沙四段烃源岩的成熟混源油。油气主要的运移通道是储集性砂体和断层。
The early Tertiary Shahejie group is the most important reservoir in Shengtuo region,Dongying depression.Its depositional characteristics were researched by means of core observation,scanning electron microscope(SEM), core lab analysis data and seismic data.Glutenite suites of various genetic types developed in the northern abrupt slope,which take skirt-type distribution transversely along the northern Shengtuo region.High quality reservoir is mainly located in middle-fan plaiting channel sand body.Both fracture activity and hydrocarbon generation system seriously affect the prevailing reservoirs in studied area.Accordingly,lithologic hydrocarbon reservoir,structural hydrocarbon reservoir and stratigraphic hydrocarbon reservoir embed in downthrown side,fracture zone and upthrown side separately.According to oil-source correlation,oil found in the deep Es_4 and part in the upper layers is generated from Es_4 mature hydrocarbon.The low-mature heavy oil dominates in the Shengbei stratigraphic reservoir and upthrown side.Biomarkers reflect its upper-Es_4 origin.Oil in Es_3 is generated from downthrown side,while mixed source oil from Es_3 and Es_4 is observed in middle-shallow group.Hydrocarbon mainly migrates through reserve sandstone and faults.
The early Tertiary Shahejie group is the most important reservoir in Shengtuo region,Dongying depression.Its depositional characteristics were researched by means of core observation,scanning electron microscope(SEM), core lab analysis data and seismic data.Glutenite suites of various genetic types developed in the northern abrupt slope,which take skirt-type distribution transversely along the northern Shengtuo region.High quality reservoir is mainly located in middle-fan plaiting channel sand body.Both fracture activity and hydrocarbon generation system seriously affect the prevailing reservoirs in studied area.Accordingly,lithologic hydrocarbon reservoir,structural hydrocarbon reservoir and stratigraphic hydrocarbon reservoir embed in downthrown side,fracture zone and upthrown side separately.According to oil-source correlation,oil found in the deep Es_4 and part in the upper layers is generated from Es_4 mature hydrocarbon.The low-mature heavy oil dominates in the Shengbei stratigraphic reservoir and upthrown side.Biomarkers reflect its upper-Es_4 origin.Oil in Es_3 is generated from downthrown side,while mixed source oil from Es_3 and Es_4 is observed in middle-shallow group.Hydrocarbon mainly migrates through reserve sandstone and faults.
引文
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[18]王秉海,钱凯.胜利油区地质研究与勘探实践[M].东营:石油大学出版社,1992.
[2]周建林,刘静,杨少春.胜坨油田坨28断块沙河街组二段储层非均质性定量研究[J].高校地质学报,2002,8(4):437-445.ZHOU Jian-lin,LIU Jing,YANG Shao-chun.A quanti-tative study on reservoir heterogeneities of the 2nd mem-ber of Shahejie formation in Tuo 28 block in ShengtuoOilfield[J].Geological Journal of China Universities,2002,8(4):437-445.
[3]朱光有,金强,戴金星,等.东营凹陷油气成藏期次及其分布规律研究[J].石油与天然气地质,2004,25(2):209-215.ZHU Guang-you,JIN Qiang,DAI Jin-xing,et al.Astudy on periods of hydrocarbon accumulation and distri-bution pattern of oil and gas pools in Dongying depression[J].Oil and Gas Geology,2004,25(2):209-215.
[4]王铜山,金强,朱光有,等.胜坨地区现今构造应力场数值模拟及其对油气运聚的意义[J].西北大学学报:自然科学网络版,2004,2(2):1-5.WANG Tong-shan,JIN Qiang,ZHU Guang-you,et al.Numerical simulation of modern tectonic stress field andits signi-ficance for petroleum migration and accumulationin Shengtuo area[J].Journal of Northwest University(Natural Science Edition),2004,2(2):1-5.
[5]冯有良,李思田.东营凹陷沙河街组三段层序低位域砂体沉积特征[J].地质论评,2001,47(3):278-286.FENG You-liang,LI Si-tian.Depositional characteristicsof lowstand sand bodies of the third member of the Sha-hejie formation in the Dongying depression and the signif-icance in petroleum geology[J].Geological Review,2001,47(3):278-286.
[6]朱光有,金强,张水昌,等.东营凹陷沙河街组湖相烃源岩组合特征[J].地质学报,2004,78(3):416-427.ZHU Guang-you,JIN Qiang,ZHANG Shui-chang,etal.Distribution characteristics of effective source rocksand their controls on hydrocarbon accumulation:a casestudy from the Dongying sag,eastern China[J].ActaGeologica Sinica,2004,78(3):416-427.
[7]JIN Qiang,PETER J M.Genetic features of petroleumsystems in rift basins of eatern China[J].Marine andPetroleum Geology,1998,15(3):343-358.
[8]朱光有,金强,戴金星,等.东营凹陷沙四中盐湖相烃源岩研究[J].高校地质学报,2004,10(2):257-266.ZHU Guang-you,JIN Qiang,DAI Jin-xing,et al.In-vestigation on the salt lake source rocks for middle Shasicolumn of Dongying depression[J].Geological Journal ofChina Universities,2004,10(2):257-266.
[9]朱光有,金强.东营凹陷两套优质烃源岩层地质地化特征研究[J].沉积学报,2003,21(3):506-512.ZHU Guang-you,JIN Qiang.Geochemical characteristicsof two sets of excellent source rocks in Dongying depres-sion[J].Acta Sedimentologica Sinica,2003,21(3):506-512.
[10]CARROLL A R,BOHACS K M.Lake-type controls onpetroleum source rock potential in nonmarine basin[J].AAPG Bull,2001,85(6):1 033-1 053.
[11]邱桂强,王居峰,张昕,等.东营三角洲沙河街组三段中亚段地层格架初步研究及油气勘探意义[J].沉积学报,2001,19(4):569-574.QIU Gui-qiang,WANG Ju-feng,ZHANG Xin,et al.Preliminary study on stratigraphy architecture of middle-Shasan Dongying delta and its significance to hydrocar-bon exploration[J].Acta Sedimentologica Sinica,2001,19(4):569-574.
[12]赵澄林,刘孟慧,姜在兴,等.渤海湾早第三纪断陷盆地含油气岩系沉积学及沉积相的基本特征[J].石油学报,1991,12(2):27-32.ZHAO Cheng-lin,LIU Meng-hui,JIANG Zai-xing,etal.The features of sedimentology and sedimentary faciesof the early Tertiary fault basin petroleum bearing rocksystem,Bohai bay[J].Acta Petrolei Sinica,1991,12(2):27-32.
[13]刘孟慧,赵澄林.渤海湾地区下第三系湖底扇的沉积特征[J].华东石油学院学报,1984,8(3):223-234.LIU Meng-hui,ZHAO Cheng-lin.Sedimentation of theearly Tertiary sublacustrine fan,Bohai bay[J].Journalof East China Petroleum Institute,1984,8(3):223-234.
[14]朱光有,金强,周建林,等.胜坨油田原油物性及其成因探讨[J].石油与天然气地质,2004,25(1):9-13.ZHU Guang-you,JIN Qiang,ZHOU Jian-lin,et al.Physical properties and genesis of oil in Shengtuo Oilfieldin Jiyang depression[J].Oil and Gas Geology,2004,25(1):9-13.
[15]朱光有,金强,王锐.有效烃源岩的识别方法[J].石油大学学报:自然科学版,2003,27(2):6-10.ZHU Guang-you,JIN Qiang,WANG Rui.Identifica-tion methods for efficient source rocks[J].Journal of theUniversity of Petroleum,China(Edition of Natural Sci-ence),2003,27(2):6-10.
[16]朱光有,金强,戴金星,等.复合生烃系统———陆相断陷盆地烃源岩评价和油气预测的重要概念[J].地质科学,2005,40(1):133-144.ZHU Guang-you,JIN Qiang,DAI Jin-xing,et al.Composite hydrocarbon-generation system:an importantconcept for source rock evaluation and hydrocarbon pre-diction in rift lacustrine basin[J].Chinese Journal ofGeology,2005,40(1):133-144.
[17]ZHU Guang-you,JIN Qiang,ZHANG Shui-chang,etal.Character and genetic types of shallow gas pools inJiyang depression[J].Organic Geochemistry,2005,36(11):1 650-1 663.
[18]王秉海,钱凯.胜利油区地质研究与勘探实践[M].东营:石油大学出版社,1992.
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