渤海海域辽西凸起锦州A构造原油地球化学特征及油源分析
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摘要
通过对辽西凸起锦州A构造沙河街组二段原油的地球化学分析,研究了原油的物性、成熟度和生物标志化合物特征。通过对比辽西凹陷和辽中凹陷已发现典型油气田的原油地球化学特征,结合区域地质背景分析了锦州A构造的油源。研究结果表明,锦州A构造西盘为低蜡、低硫凝析原油,而东盘为高蜡、低硫轻质原油。原油饱和烃色谱完整,显示未遭受明显生物降解。油源母质为混合型,沙河街组二段原油陆源有机质输入较少。原油形成于弱还原—还原条件下的微咸水或咸水沉积环境。根据锦州A构造原油的生物标志物特征,利用聚类分析方法划分为2类原油:Ⅰ类原油表现为高伽马蜡烷指数、低—中等四甲基甾烷指数、低藿烷/甾烷、高C_(27)/C_(29)甾烷和高C_(28)/C_(29)甾烷比值,主要来源于辽西凹陷沙一段烃源岩;Ⅱ类原油表现为低—中等伽马蜡烷指数、中等—高四甲基甾烷指数、高藿烷/甾烷、中等C_(27)/C_(29)甾烷和低C_(28)/C_(29)甾烷比值,主要来源于辽中凹陷沙三段烃源岩。
Geochemical analyses of crude oil samples from the 2nd Member of Shahejie Formation of the JZ-A structure on the Liaoxi Uplift were carried out,upon which physical properties,maturities and characteristics of biomarkers of the crude oil were studied.Comparison of geochemical characteristics of the crude oil is conducted for the oil and gas fields discovered in the Liaoxi and Lizhong depressions.The research results show that the crude oil in the western block is dominated by condensate oil with low wax and low sulfur,while the crude oil in the eastern block is characterized by light oil with high wax and low sulfur.The saturated hydrocarbon chromatograms of the crude oil from JZA structure show a complete distribution pattern,indicating a lack of biodegradation.The results also show that organic matters in the 2 nd Member of Shahejie Formation came from a mixed source with minor terrigenous input of organic matter.Crude oils were formed in a reduction to weak reduction and brackish or saline water environment.Two source-related oil classes are identified by hierarchical cluster analysis according to the biomarkers of the crude oil from JZ-A structure.The ClassⅠoil has higher gammacerane index,low-medium 4-methyl sterane indices(4-MSI),low hopane/sterane,high C_(27)/C_(29) sterane and high C_(28)/C_(29) sterane,which is most similar with the E2 s1 source rock of Liaoxi Depression.However,the ClassⅡ oil displays low-medium gammacerane index,medium-high 4-MSI,high hopane/sterane,medium C_(27)/C_(29) sterane and low C_(28)/C_(29) sterane,mostly similar with the E_2s~3 source rock of Liaozhong Depression.
Geochemical analyses of crude oil samples from the 2nd Member of Shahejie Formation of the JZ-A structure on the Liaoxi Uplift were carried out,upon which physical properties,maturities and characteristics of biomarkers of the crude oil were studied.Comparison of geochemical characteristics of the crude oil is conducted for the oil and gas fields discovered in the Liaoxi and Lizhong depressions.The research results show that the crude oil in the western block is dominated by condensate oil with low wax and low sulfur,while the crude oil in the eastern block is characterized by light oil with high wax and low sulfur.The saturated hydrocarbon chromatograms of the crude oil from JZA structure show a complete distribution pattern,indicating a lack of biodegradation.The results also show that organic matters in the 2 nd Member of Shahejie Formation came from a mixed source with minor terrigenous input of organic matter.Crude oils were formed in a reduction to weak reduction and brackish or saline water environment.Two source-related oil classes are identified by hierarchical cluster analysis according to the biomarkers of the crude oil from JZ-A structure.The ClassⅠoil has higher gammacerane index,low-medium 4-methyl sterane indices(4-MSI),low hopane/sterane,high C_(27)/C_(29) sterane and high C_(28)/C_(29) sterane,which is most similar with the E2 s1 source rock of Liaoxi Depression.However,the ClassⅡ oil displays low-medium gammacerane index,medium-high 4-MSI,high hopane/sterane,medium C_(27)/C_(29) sterane and low C_(28)/C_(29) sterane,mostly similar with the E_2s~3 source rock of Liaozhong Depression.
引文
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[13]庞雄奇,郭永华,姜福杰,等.渤海海域优质烃源岩及其分布预测[J].石油与天然气地质,2009,30(4):393-397.
[14]姜雪,邹华耀,庄新兵,等.辽东湾地区烃源岩特征及其主控因素[J].中国石油大学学报(自然科学版),2010,34(2):31-38.
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[16]Peters K E,Snedden J W,Sulaeman A,et al.A new geochemical-sequence stratigraphic model for the Mahakam delta and Makassar slope,Kalimantan,Indonesia[J].AAPG Bulletin,2000,84(1):12-44.
[17]Justwan H,Dahl B,Isaksen G H.Geochemical characterisation and genetic origin of oils and condensates in the South Viking Graben,Norway[J].Marine and Petroleum Geology,2006,23(2):213-239.
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[21]Hao F,Zhou X H,Zhu Y M,et al.Charging of oil fields surrounding the Shaleitian uplift from multiple source rock intervals and generative kitchens,Bohai Bay Basin,China[J].Marine and Petroleum Geology,2010,27(9):1910-1926.
[22]侯读杰,冯子辉.油气地球化学[M].北京:石油工业出版社,2011:85.
[23]赵阳,姚泾利,段毅,等.鄂尔多斯盆地陇东地区长9油层组油源分析[J].沉积学报,2015,33(5):1023-1032.
[24]Powell T G.Pristane/phytane ratio as environmental indicator[J].Nature,1988,333(6174):604.
[25]Large D J,Gize A P.Pristane/phytane ratios in the mineralized kupferschiefer of the Fore-Sudetic Monocline,southwest Poland[J].Ore Geology Reviews,1996,11(s1/3):89-103.
[26]潘文静,王清斌,刘士磊,等.渤海海域石臼坨地区古近系沙河街组湖相生屑白云岩成因[J].古地理学报,2017,19(5):835-848.
[27]董君妍,陈世加,邹贤利,等.鄂尔多斯盆地吴起-高桥地区延长组重排类藿烷分布特征及成因探讨[J].石油实验地质,2017,39(6):834-841.
[28]Chen J Y,Bi Y P,Zhang J G,et al.Oil-source correlation in the Fulin basin,Shengli petroleum province,East China[J].Organic Geochemistry,1996,24(8/9):931-940.
[29]Hao F,Zhou X H,Zhu Y M,et al.Mechanisms of petroleum accumulation in the Bozhong sub-basin,Bohai Bay basin,China.Part 1:origin and occurrence of crude oils[J].Marine and Petroleum Geology,2009,26(8):1528-1542.
[30]Connan J,Cassou A M.Properties of gases and petroleum liquids derived from terestrial kerogen at various maturation levels[J].Geochimica et Cosmochimica Acta,1980,44(1):1-23.
[31]Peters K E,Fraser T H,Amris W,et al.Geochemistry of crude oils from eastern Indonesia[J].AAPG Bulletin,1999,83(12):1927-1942.
[32]Sinninghe DamstéJ S,Kenig F,Koopmans M P,et al.Evidence for gammacerane as an indicator of water column stratification[J].Geochimica et Cosmochimica Acta,1995,59(9):1895-1900.
[33]Fu J M,Sheng G,Peng P A,et al.Peculiarities of salt lake sediments as potential source rocks in China[J].Organic Geochemistry,1986,10(1/3):119-126.
[34]Moldowan J M,Seifert W K,Gallegos E J.Relationship between petroleum composition and depositional environment of petroleum source rocks[J].AAPG Bulletin,1985,69(8):1255-1268.
[35]Peters K E,Walters C C,Moldowan J M.The Biomarker Guide,Biomarkers and Isotopes in Petroleum Exploration and Earth Hisory[M].Cambridge:Cambridge University Press,2005:1155.
[36]Fu J M,Sheng G,Xu J,et al.Application of biological markers in the assessment of paleoenvironments of Chinese nonmarine sediments[J].Organic Geochemistry,1990,16(4/6):769-779.
[37]Ritts B D,Hanson A D,Zinniker D,et al.Lower-Middle Jurassic nonmarine source rocks and petroleum systems of the northern Qaidam basin,northwest China[J].AAPGBulletin,1999,83(12):1980-2005.
[38]Hanson A D,Zhang S C,Moldowan J M,et al.Molecular organic geochemistry of the Tarim basin,northwest China[J].AAPG Bulletin,2000,84(8):1109-1128.
[39]Manzi V,Roveri M,Gennari R,et al.The deepwater counterpart of the Messinian lower evaporites in the Apennine foredeep:the Fanantello section(Northern Apennines,Italy)[J].Palaeogeography,Palaeoclimatology,Palaeoecology,2007,251(3):470-499.
[40]Zhu Y M,Weng H X,Su A G,et al.Geochemical characteristics of Tertiary saline lacustrine oils in the western Qaidam basin,northwest China[J].Applied Geochemistry,2005,20(10):1875-1889.
[41]Palacas J G,Anders D E,King J D.Florida Basin-a prime example of carbonate source rocks of petroleum[M]∥Palacas J G.Petroleum Geochemistry and Source Rock Potential of Carbonate Rocks.AAPG Studies in Geology,1984,18:71-96.
[42]Mrkic′S,Stojanovic′K,Kostic′A,et al.Organic geochemistry of miocene source rocks from the Banat depression(SE Pannonian Basin,Serbia)[J].Organic Geochemistry,2011,42(6):655-677.
[43]陈建平,黄第藩,陈建军,等.酒东盆地油气生成和运移[M].北京:石油工业出版社,1996:14-238.
[44]Huang D F,Li J C,Zhang D J.Maturation sequence of continental crude oils in hydrocarbon basins in China and its significance[J].Organic Geochemistry,1990,16(1/3):521-529.
[45]Chandra K,Mishra C S,Samanta U,et al.Correlation of different maturity parameters in the AhmedabadeMehsana block of the Cambay basin[J].Organic Geochemistry,1994,21(3/4):313-321.
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