印尼J区块西部浊积砂体的发现及其地质意义
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摘要
随着全球油气勘探的重点逐渐转向岩性地层圈闭,深水浊积砂体已成为含油气盆地研究中的一个热点。为了探讨印尼J区块西部浊积砂体的形成机理,从测井、地震、沉积相和储层反演分析入手,对区块内浊积砂体的形成、分布和圈闭发育特征进行了研究,发现从砂体的根部、中部到前缘,自然电位曲线主要呈"箱形"、"漏斗"和"锯齿"状特征,砂体顶、底与泥岩均呈突变性接触关系。在地震剖面上,其外部形态呈透镜状,西薄东厚,内部反射呈平行—亚平行、中强振幅,中低频、较连续的反射,与下伏地层呈下超接触关系。分析认为,该砂体为厚层泥岩夹持、多期叠置、经三角洲前缘滑塌再搬运沉积而形成的浊积砂体。这一发现为该区块的层序划分提供了参考标志,开辟了新的勘探层系,指明了新的勘探方向。
Along with the key direction of global oil and gas exploration transferred gradually to the lithologic and stratigraphic traps,the turbidite sandstone in deep water has become a hot research spot of hydrocarbon-bearing basin study.To examine the formation mechanism of turbidite sandstone in western Block J,the characteristics of formation,distribution and trap development of the turbidite sandstones in the block are studied by the analysis of well logging,seismic characteristics,sedimentary facies and reservoir inversion.Study results show that the spontaneous potential curve is mainly of box type,funnel type and sawtooth type characteristics,and that the top and bottom of sands show the abrupt contact with mudstone from the roots to the central and to the front of the sands.The morphology in seismic section is lenticular,with west thin and east thick,the internal reflection is parallel-subparallel,medium to strong amplitude,medium to low frequency and more continuous reflection,with a downlap contact relationship to underlying stratum.The turbidite sandstones were formed by the multiphase overlying and rehandling deposition of slumped delta front,which are lens sandstone in thick layer of shale.The discovery provides a reference mark for the division of sequence stratigraphy in the block,finds out a new series of exploration,points out a new exploration direction for the block.
Along with the key direction of global oil and gas exploration transferred gradually to the lithologic and stratigraphic traps,the turbidite sandstone in deep water has become a hot research spot of hydrocarbon-bearing basin study.To examine the formation mechanism of turbidite sandstone in western Block J,the characteristics of formation,distribution and trap development of the turbidite sandstones in the block are studied by the analysis of well logging,seismic characteristics,sedimentary facies and reservoir inversion.Study results show that the spontaneous potential curve is mainly of box type,funnel type and sawtooth type characteristics,and that the top and bottom of sands show the abrupt contact with mudstone from the roots to the central and to the front of the sands.The morphology in seismic section is lenticular,with west thin and east thick,the internal reflection is parallel-subparallel,medium to strong amplitude,medium to low frequency and more continuous reflection,with a downlap contact relationship to underlying stratum.The turbidite sandstones were formed by the multiphase overlying and rehandling deposition of slumped delta front,which are lens sandstone in thick layer of shale.The discovery provides a reference mark for the division of sequence stratigraphy in the block,finds out a new series of exploration,points out a new exploration direction for the block.
引文
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[3]刘宪斌,万晓樵,林金逞,等.陆相浊流沉积体系与油气[J].地球学报,2003,24(1):61-66.Liu Xianbin,Wan Xiaoqiao,Lin Jincheng,et al.Continental turbiditedeposition system and hydrocarbon[J].Acta Geoscientia Sinica,2003,24(1):61-66.
[4]William McCaffrey,Benjamin Kneller.Process controls on thedevelopment of stratigraphic trap potential on the margins of confinedturbidite systems and aids to reservoir evaluation[J].AAPG Bulletin,2001,85(6):971-988.
[5]薛良清,杨福忠,马海珍,等.中国石油印尼项目的勘探实践[J].中国石油勘探,2006,11(2):63-69.Xue Liangqing,Yang Fuzhong,Ma Haizhen,et al.The explorationpractice of PetroChina in Indonesia[J].China Petroleum Exploration,2006,11(2):63-69.
[6]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(2):58-62.Tong Xiaoguang,Yang Fuzhong.Oil and gas resources of Indonesiaand the status of PetroChina′s contract blocks[J].China PetroleumExploration,2005(2):58-62.
[7]薛良清,杨福忠,马海珍,等.南苏门达腊盆地中国石油合同区块成藏组合分析[J].石油勘探与开发,2005,32(3):130-134.Xue Liangqing,Yang Fuzhong,Ma Haizhen,et al.Petroleum playanalysis of the PetroChina contract blocks in the South SumatraBasin[J].Petroleum Exploration and Development,2005,32(3):130-134.
[8]刘亚明,薛良清,杨福忠,等.印尼J区块层序地层与沉积相特征研究[J].西南石油大学学报:自然科学版,2008,30(6):45-49.Liu Yaming,Xue Liangqing,Yang Fuzhong,et al.Sequencestratigraphy and sedimentary facies of the reservoir in Jabung Block,Indonesia[J].Journal of Southwest Petroleum University:Science&Technology Edition,30(6):45-49.
[9]Shanmugam G.50 years of the turbidite paradigm(1950—1990):deep-water processes and facies models:a critical perspective[J].Marine and Petroleum Geology,2000,17(2):285-342.
[10]冯增昭.沉积岩石学[M].2版.北京:石油工业出版社,1993.Feng Zengzhao.Sedimentary petrology[M].2nd ed.Beijing:PetroleumIndustry Press,1993.
[11]B ennetts K R W,Pinkeye O H.Characteristics of three turbidites,Hispaniola-CaicosBasin[J].GSA Bulletin,1976,87(9):1291-1300.
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