南苏门答腊盆地北部新生代层序地层格架及有利储层分布
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摘要
南苏门答腊盆地是在欧亚、印度洋-澳大利亚、太平洋三大板块交汇处发育起来的新生代弧后裂谷沉积盆地,经历了一次完整的海进—海退旋回。应用层序地层学的原理和方法,综合研究盆地北部钻井、测井及地震资料,确定4种层序界面识别标志,在盆地北部新生代始新世—中新世识别出2种类型层序界面:不整合面和沉积作用转换面。南苏门答腊盆地北部新生代始新世—中新世发育8个具有等时意义的层序界面,将其划分为7个三级层序。分析层序格架内基准面上升期与下降期地层叠加样式及沉积相构成特征,认为冲积扇、河流、三角洲和盆底低位扇等沉积体系是南苏门答腊盆地北部最重要的勘探目标,有利的岩性储集相带主要分布在基准面上升期,为后期盆地勘探的潜在领域,特别要重视对邻近不整合面或沉积作用转换面位置的储集层精细描述,选择有利相带进行钻探与评价。
South Sumatra Basin is located in the combination region of Eurasian-Asian,Indian-Australian and Pacific plates.It is a Phanerozoic back-arc rifted basin and undergoes an integral cyclic succession of the transgression-regression.According to drilling,logging and seismic data in the north of the basin,four types of identification signs were determined to the Phanerozoic sequence boundary.And two kinds of sequence boundaries(unconformity and shift surface of deposition) were identified.Stratigraphic superimposed style and sediment feature inside the base level cycles were studied.The results show that eight isochronous sequence boundaries develop in the Phanerozoic stratigraphy,which divides into seven third-order sequences in the north of South Sumatra Basin further.Alluvial fan system,fluvial system,delta system and basin floor fan are the key target series for exploration in the north of South Sumatra Basin.The distribution of advantaged lithologic reservoir facies is mainly developed in the half cycle of increasing A/S conditions,which is potential exploitation resource in the region.
South Sumatra Basin is located in the combination region of Eurasian-Asian,Indian-Australian and Pacific plates.It is a Phanerozoic back-arc rifted basin and undergoes an integral cyclic succession of the transgression-regression.According to drilling,logging and seismic data in the north of the basin,four types of identification signs were determined to the Phanerozoic sequence boundary.And two kinds of sequence boundaries(unconformity and shift surface of deposition) were identified.Stratigraphic superimposed style and sediment feature inside the base level cycles were studied.The results show that eight isochronous sequence boundaries develop in the Phanerozoic stratigraphy,which divides into seven third-order sequences in the north of South Sumatra Basin further.Alluvial fan system,fluvial system,delta system and basin floor fan are the key target series for exploration in the north of South Sumatra Basin.The distribution of advantaged lithologic reservoir facies is mainly developed in the half cycle of increasing A/S conditions,which is potential exploitation resource in the region.
引文
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[14]冯有良.断陷盆地层序格架中岩性地层油气藏分布特征[J].石油学报,2005,26(4):17?22.FENG You-liang.Distribution of stratigraphic and lithologicreservoirs in sequence framework of rift subsidence basin[J].Acta Petrolei Sinica,2005,26(4):17?22.
[15]Galloway W E.Genetic stratigraphic sequences in basin analysis I:Architecture and genesis of flooding-surface boundeddepositional units[J].AAPG Bulletin,1989,73(2):125?142,143?154.
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[2]许浚远,杨巍然,曾佐勋,等.南中国海成因:右行拉分作用与左行转换挤压作用交替[J].地学前缘,2004,11(3):193-206.XU Jun-yuan,YANG Wei-ran,ZENG Zuo-xun,et al.Genesis of South China Sea:Intervening of dextral pull-apart and sinistraltransgression[J].Earth Science Frontiers,2004,11(3):193?206.
[3]Moore D E,Hickman S,Lockner D A.Hydrothermal mineralsand microstructures in the Silangkitang geothermal field alongthe Great Sumatran fault zone,Sumatra,Indonesia[J].Geological Society of America Bulletin,2001,113(9):1179?1192.
[4]Metcalfe I.Palaeozoic and Mesozoic tectonic evolution andpalaeogeography of East Asian crustal fragments:The Korean Peninsula in context[J].Gondwana Research,2006,9(1):24?46.
[5]童晓光,杨福忠.印尼油气资源及中国石油合同区块现状[J].中国石油勘探,2005,10(2):58?62.TONG Xiao-guang,YANG Fu-zhong.Oil and gas resource andoccurrence of Petro China’s Block in Indonesia[J].China Petroleum Exploration,2005,10(2):58?62.
[6]Cross T A,Lessenger M A.Sediment volume partitioning:Rational for stratigraphic model evaluation and high-resolutionstatigraphic correlation[C]//Gradstein F M,Sandvik K O,Milton N J.Sequence Stratigraphy Concepts and Applications.NPFSpecial Publication,1998:171?195.
[7]Posamentier H W.Ancient shelf ridges-A potentially significantcomponent of the transgressive systems tract:Case study fromoffshore northwest Java[J].AAPG Bulletin,2002,86(1):75?106.
[8]Harmen R,Sosrowidjojo I B,Wildiarto F X.Musi platform and Palembang high:A new look at the petroleumsystem[M]//Jakarta:IPA,1998:265?276.
[9]Suseno P H,Zakaria,Nizar M,et al.Contribution of Lahatformation as hydrocarbon source rock in south Palembang area,South Sumatra,Indonesia[M]//Jakarta:IPA,1992:325?337.
[10]Carlos T,Miharwatiman J S,Aisyah A,et al.Redevelopment of Rayun oil field(South Sumatra):A seismic successstory[C]//Jakarta:IPA,2000:65?81.
[11]邓宏文,王红亮,李熙喆.层序地层地层基准面的识别、对比技术及应用[J].石油与天然气地质,1996,17(3):177?183.DENG Hong-wen,WANG Hong-liang,LI Xi-zhe.Identificationand correlation techniques of sequence stratigraphic base-levelsand their application[J].Oil & Gas Geology,1996,17(3):177?183.
[12]王居峰,邓宏文,蔡希源.准噶尔盆地中部侏罗系层序地层格架[J].石油勘探与开发,2005,32(1):23?26.WANG Ju-feng,DENG Hong-wen,CAI Xi-yuan.Jurassicsequence stratigraphic frames in the middle Junggar Basin[J].Petroleum Exploration and Development,2005,32(1):23?26.
[13]瞿辉,赵文智.层序格架在油气勘探中的作用[J].石油勘探与开发,2000,27(5):40?43.QU Hui,ZHAO Wen-zhi.The application of sequencesframework to oil and gas exploration[J].Petroleum Explorationand Development,2000,27(5):40?43.
[14]冯有良.断陷盆地层序格架中岩性地层油气藏分布特征[J].石油学报,2005,26(4):17?22.FENG You-liang.Distribution of stratigraphic and lithologicreservoirs in sequence framework of rift subsidence basin[J].Acta Petrolei Sinica,2005,26(4):17?22.
[15]Galloway W E.Genetic stratigraphic sequences in basin analysis I:Architecture and genesis of flooding-surface boundeddepositional units[J].AAPG Bulletin,1989,73(2):125?142,143?154.
[16]Shanley K W.Perspective on the sequence stratigraphy ofcontinental strata[J].AAPG Bulletin,1994,74(4):544?568.
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