柴达木盆地北缘冷湖南八仙构造带油气成藏条件及成藏模式
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摘要
冷湖-南八仙构造带是柴达木盆地油气勘探的重点地区之一。综合地质、地震和分析化验等资料,应用现代油气成藏、地球物理学、地球化学等理论和方法,对该地区油气成藏的地质条件及成藏模式进行了分析。结果表明,该区带油源丰富,储集条件好,发育多套有效的储盖组合,多种类型圈闭(尤其是构造圈闭)发育且成排成带分布,各成藏要素配置良好,具有形成大中型油气田的有利条件。在此基础上,提出了该区带油气有近源断层输导纵向成藏、远源不整合输导侧向成藏、近源不整合输导纵向成藏和近源混合输导成藏4种模式。其中,近源断层输导纵向成藏模式和近源混合输导成藏模式是本区主要的油气成藏模式,而近源不整合输导纵向成藏模式的油藏可作为本地区下一步勘探的方向。
Lenghu-Nanbaxian structural belt,an important region for oil-gas exploration,is located in the northern margin of Qaidam Basin.The geologic conditions and patterns of hydrocarbon accumulation were researched by using theories and methods of modern reservoir formation,geophysics,geochemistry,and the data of geology,seismics and analysis assay.The results show that this area is likely to be large or medium-sized oil-gas field with abundant oil-sources,good reservoirs,developed several sets of effective reservoir-caprock assemblage,multiple types of trap(especially structural trap) distributing in lines and belts,and good allocation of various reservoir-forming factors.Based on these researches,the reservoir-forming patterns of the Lenghu-Nanbaxian structural belt can be classified as four kinds: near-source fault translocation vertical reservoir-forming pattern,far-source unconformity translocation lateral reservoir-forming pattern,near-source mixed translocation reservoir-forming pattern and near-source unconformity translocation vertical reservoir-forming pattern.The near-source fault translocation vertical reservoir-forming pattern and near-source mixed translocation reservoir-forming pattern are main reservoir-forming patterns of the area.Near-source unconformity translocation vertical reservoir-forming pattern can be looked on as exploration direction in future.
Lenghu-Nanbaxian structural belt,an important region for oil-gas exploration,is located in the northern margin of Qaidam Basin.The geologic conditions and patterns of hydrocarbon accumulation were researched by using theories and methods of modern reservoir formation,geophysics,geochemistry,and the data of geology,seismics and analysis assay.The results show that this area is likely to be large or medium-sized oil-gas field with abundant oil-sources,good reservoirs,developed several sets of effective reservoir-caprock assemblage,multiple types of trap(especially structural trap) distributing in lines and belts,and good allocation of various reservoir-forming factors.Based on these researches,the reservoir-forming patterns of the Lenghu-Nanbaxian structural belt can be classified as four kinds: near-source fault translocation vertical reservoir-forming pattern,far-source unconformity translocation lateral reservoir-forming pattern,near-source mixed translocation reservoir-forming pattern and near-source unconformity translocation vertical reservoir-forming pattern.The near-source fault translocation vertical reservoir-forming pattern and near-source mixed translocation reservoir-forming pattern are main reservoir-forming patterns of the area.Near-source unconformity translocation vertical reservoir-forming pattern can be looked on as exploration direction in future.
引文
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①党玉琪,余辉龙.柴达木盆地北缘前陆盆地油气富集规律及勘探目标选择.青海油田勘探开发研究院,2003.
①查明,吴孔友,高长海.柴北缘重点地区断层封闭性与油气成藏.中国石油大学(华东),2005.
[2]门相勇,赵文智,余辉龙.柴达木盆地北缘冷湖地区油气成藏条件研究与勘探建议[J].石油勘探与开发,2001,28(4):4-7.MEN X iang-yong,ZHAO W en-zh i,YU Hu i-long.A stud-y on oil and gas accumu lation in Lenghu area of the north-ern m argin ofQaidam Basin and som e relevant exp lorationsuggestions[J].Petroleum Exp loration and Developm ent,2001,28(4):4-7.
[3]穆剑,汪立群.论柴达木盆地冷湖-南八仙构造带的含油气远景[J].石油学报,1999,20(2):18-22.MU Jian,WANG L i-qun.Petroliferous prospect of Leng-hu-Nanbaxian structural belt in Qaidam Basin[J].ActaPetrole i S in ica,1999,20(2):18-22.
[4]刘洛夫,妥进才,于会娟,等.柴达木盆地北部地区侏罗系烃源岩地球化学特征[J].石油大学学报:自然科学版,2000,24(1):64-68.LIU Luo-fu,TUO Jin-cai,YU Hu i-juan,et al.Geochem-istry of the Jurassic source rocks in the northern areas ofQaidam Basin[J].Journal of the Un iversity of Petroleum,China(Ed ition of Natural Sc ience),2000,24(1):64-68.
[5]王鹏,赵澄林.柴达木盆地北缘地区第三系碎屑岩储层沉积相特征[J].石油大学学报:自然科学版,2001,25(1):12-15.WANG Peng,ZHAO Cheng-lin.Characteristics ofTertia-ry reservoir sed im entary fac ies in the north part ofQaidamBasin[J].Journal of the Un iversity of Petroleum,Ch ina(Ed ition of Natural Sc ience),2001,25(1):12-15.
[6]陈淑兰,罗群.柴达木盆地北缘西段断裂发育特征与油气聚集[J].天然气工业,2004,24(3):22-25.CHEN Shu-lan,LUO Qun.Fau lt developm ent character-istics and hydrocarbon accumu lation in the west section ofthe northern fringe of Qaidam Basin[J].Natural Gas In-dustry,2004,24(3):22-25.
[7]高先志,陈发景.柴达木盆地北缘西段油气成藏机理研究[J].地球科学——中国地质大学学报,2002,27(6):757-762.GAO X ian-zh i,CHEN Fa-jing.Accumu lation model ofpetroleum in the Tertiary system of the northwestern Qaid-am Basin[J].Earth Sc ience—Journal of Ch ina Un iversityof Geosc iences,2002,27(6):757-762.
[8]LAW B E.Basin-centered gas system s[J].AAPG Bu lle-tin,2002,88(11):1 891-1 919.
[9]JOHNSON R C,FINN TM,NUCCIO V F.Potential for ba-sin-centered gas accumulation in the A lbuquerque Basin,NewMexico[J].Geological Survey Bulletin,2001,21(8):4-21.
[10]薛光华,杨永泰.柴达木盆地北缘油气分布规律研究[J].石油实验地质,2002,24(2):141-146.XUE Guang-hua,YANG Yong-tai.Study on the d istri-bution ru les of hydrocarbon in the northern m argin ofQaidam Basin[J].Petroleum Geology&Experim ent,2002,24(2):141-146.
①党玉琪,余辉龙.柴达木盆地北缘前陆盆地油气富集规律及勘探目标选择.青海油田勘探开发研究院,2003.
①查明,吴孔友,高长海.柴北缘重点地区断层封闭性与油气成藏.中国石油大学(华东),2005.
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