银根—额济纳旗盆地拐子湖凹陷白垩系油源对比分析
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摘要
银根—额济纳旗盆地拐子湖凹陷X井白垩系巴音戈壁组二段发现的高产油流展示了该低勘探盆地的光明前景。目前对原油的来源尚没有统一的认识,为了有效预测油气藏和明确勘探方向,开展了油源对比研究。对X井苏红图组一段油砂、巴音戈壁组二段原油及苏红图组二段、巴音戈壁组二段、巴音戈壁组一段泥岩开展的族组分含量、生物标志化合物及碳同位素组成等研究表明,油砂、原油与巴音戈壁组一段烃源岩各方面地化特征最为接近,生标上均具有高C_(30)重排藿烷、高伽马蜡烷含量、低Pr/Ph值、高成熟度的特征,反映出X井苏红图组一段油砂和巴音戈壁组二段原油同源,均与巴音戈壁组一段烃源岩具有良好的亲缘关系。
Recently, high oil product was gained in the second member of the Cretaceous Bayingebi Formation(K_1b_2) in the well X in the Guaizihu Sag of Yin'gen-E'ji'naqi Basin, which revealed a bright exploration prospect. It has not obtained a quite unified understanding of petroleum source, so some research were made on the oil-source correlation,which will be helpful for the prediction of hydrocarbon reservoir and the selection of exploration direction. The analyses of composition, biomarker and carbon isotope were made with oil sand samples from the first member of Suhongtu Formation(K_1s_1), crude oil samples from the second member of Bayingebi Formation, and mudstone samples from the second member of Suhongtu Formation(K_1s_2) as well as and the second and first members of Bayingebi Formation. The geochemical features of oil sands, crude oil are close with K_1b_1 source rocks, showing high contents of C_(30)-diahopane and gammacerane, low Pr/Ph and high maturity. The good similarity reflects that K_1s_1 oil sands and K_1b_(2 )oil are homologous, and their parent material are both from K_1b_(1 )source rocks.
Recently, high oil product was gained in the second member of the Cretaceous Bayingebi Formation(K_1b_2) in the well X in the Guaizihu Sag of Yin'gen-E'ji'naqi Basin, which revealed a bright exploration prospect. It has not obtained a quite unified understanding of petroleum source, so some research were made on the oil-source correlation,which will be helpful for the prediction of hydrocarbon reservoir and the selection of exploration direction. The analyses of composition, biomarker and carbon isotope were made with oil sand samples from the first member of Suhongtu Formation(K_1s_1), crude oil samples from the second member of Bayingebi Formation, and mudstone samples from the second member of Suhongtu Formation(K_1s_2) as well as and the second and first members of Bayingebi Formation. The geochemical features of oil sands, crude oil are close with K_1b_1 source rocks, showing high contents of C_(30)-diahopane and gammacerane, low Pr/Ph and high maturity. The good similarity reflects that K_1s_1 oil sands and K_1b_(2 )oil are homologous, and their parent material are both from K_1b_(1 )source rocks.
引文
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[2] 秦建中,金聚畅,刘宝泉.海相不同类型烃源岩有机质丰度热演化规律[J].石油与天然气地质,2005,26(2):177-184.QIN Jianzhong,JIN Juchang,LIU Baoquan.Thermal evolution pattern of organic matter abundance in various marine source rocks[J].Oil & Gas Geology,2005,26(2):177-184.
[3] 万中华,李素梅.渤海湾盆地南堡油田原油碳同位素组成特征及影响因素[J].石油勘探与开发,2010,37(1):21-25.WAN Zhonghua,LI Sumei.Carbon isotope composition and influence factors of oil in Nanpu oilfield in Bohaiwan Basin[J].Petro-leum Exploration and Development,2010,37(1):21-25.
[4] 罗宪婴,赵宗举,孟元林.正构烷烃奇偶优势在油源对比中的应用—以塔里木盆地下古生界为例[J].石油实验地质,2007,29(1):74-77.LUO Xianying,ZHAO Zongju,MENG Yuanlin.The application of n-alkane’s odd-even carbon number predominance in oil-source rock correlation:an example of the Lower Paleozoic in Tarim Basin[J].Petroleum Geology and Experiment,2007,29(1):74-77.
[5] 孟仟祥,房嬛,徐永昌,等.柴达木盆地石炭系烃源岩和煤岩生物标志物特征及其地球化学意义[J].沉积学报,2004,22(4):729-736.MENG Qianxiang,FANG Xuan,XU Yongcang,et al.Biomarkers and geochemical significance of Carboniferous source rocks and coals from Qaidam Basin[J].Acta Sedimentologica Sinica,2004,22(4):729-736.
[6] 王志远,刘占红,易铁,等.不同气候和植被区现代土壤类脂物分子特征及其意义[J].土壤学报,2003,40(6):967-970.WANG Zhiyuan,LIU Zhanhong,YI Tie,et al.Features of lipids and their significance in modern soils from various climate-vegetation regions[J].Acta Pedologica Sinica,2003,40(6):967-970.
[7] BOOKS J D,GOULD K,SMITH J W.Isoprenoid hydrocarbons in coal and petroleum[J].Nature,1969,222(5190):257-259.
[8] 彼得斯K E,沃尔特斯C C,莫尔多万J M.生物标志化合物指南[M].2版.张水昌,李振西,译.北京:石油工业出版社,2011.PETERS K E,WALTERS C C,MOLDOWAN J M.The biomarker guide[M].2nd ed.ZHANG Shuicang,LI Zhenxi,trans.Beijing:Petroleum Industry Press,2011.
[9] LI Maowen,LIN Renzi,LIAO Yongsheng,et al.Organic geochemistry of oils and condensates in the Kekeya Field,southwest depression of the Tarim Basin (China)[J].Organic Geochemistry,1999,30(1):15-37.
[10] TEN HAVEN H L,DE LEEUM J W,RULLK?TTER J,et al.Restricted utility of the pristane/phytane ratio as a palaeo environmental indicator[J].Nature,1987,330(6149):641-643.
[11] BLUMER M,SNYDER W D.Isoprenoid hydrocarbons in recent sediments:presence of pristane and probable absence of phytane[J].Science,1965,150(3703):1588-1589.
[12] RISATTI J B,ROWLAND S J,YON D A,et al.Stereochemical studies of acyclic isoprenoids-Ⅻ.Lipids of methanogenic bacteria and possible contributions to sediments[J].Organic Geochemistry,1984,6:93-104.
[13] BURNHAM A K,CLARKSON J E,SINGLETON M F,et al.Biolo-gical markers from Green River kerogen decomposition[J].Geochimica et Cosmochi-mica Acta,1982,46(7):1243-1251.
[14] KOOPMANS M P,RIJPSTRA W I C,KLAPWIJK M M,et al.A thermal and chemical degradation approach to decipher pristane and phytane precursors in sedimentary organic matter[J].Organic Geochemistry,1999,30(9):1089-1104.
[15] 傅家谟,盛国英,许家友,等.应用生物标志化合物参数判识古沉积环境[J].地球化学,1991,3(1):1-12.FU Jiamo,SHENG Guoying,XU Jiayou,et al.Application of biomarker compounds in assessment of paleoenvironments of Chinese terrestrial sediments[J].Geochimica,1991,3(1):1-12.
[16] PETERS K E,WALTERS C C,MOLDOWAN J M.The biomarker guide,volume 2:biomarkers and isotopes in the petroleum exploration and earth history[M].Cambridge:Cambridge University Press,2005.
[17] 张文正,杨华,候林慧,等.鄂尔多斯盆地延长组不同烃源岩17α(H)-重排藿烷的分布及其地质意义[J].中国科学(D辑地球科学),2009,39(10):1438-1445.ZHANG Wenzheng,YANG Hua,HOU Huilin,et al.Distribution and geological significance of 17α(H)-diahopanes from different hydrocarbon source rocks of Yanchang Formation in Ordos Basin[J].Science in China (Series D Earth Sciences),2009,52(7):965-974.
[18] KOLACZKOWSKA E,SLOUGUI N E,WATT D S,et al.Thermodynamic stability of various alkylated,dealkylated and rearranged 17α-and 17β-hopane isomers using molecular mechanics calculations[J].Organic Geochemistry,1990,16(4/6):1033-1038.
[19] ARMANIOS C,ALEXANDER R,KAGI R I.High diahopane and neohopane abundances in a biodegraded crude oil from the Barrow Sub-Basin of Western Australia[J].Organic Geoche-mistry,1992,18(5):641-645.
[20] MOLDOWAN J M,FAGO F J,CARLSON R M K,et al.Rearranged hopanes in sediments and petroleum[J].Geochimica et Cosmochimica Acta,1991,55(11):3333-3353.
[21] PETERS K E,MOLDOWAN J M.The biomarker guide:interpreting molecular fossils in petroleum and ancient sediments[M].Englewood Cliffs,New Jersey:Preentice Hall,1993.
[22] PHILIP R P,GILBERT T D.Biomarker distribution in oils predominantly derived from terrigenous source material[M]//LEYTHAEUSER D,RULLKOTTER J.Advances in Organic Chemistry,1985.Oxford:Pergamon Press,1986:73-84.
[23] 肖中尧,黄光辉,卢玉红,等.库车坳陷却勒1井原油的重排藿烷系列及油源对比[J].石油勘探与开发,2004,31(2):35-37.XIAO Zhongyao,HUANG Guanghui,LU Yuhong,et al.Rearranged hopanes in oils from the Quele 1 well,Tarim Basin,and the significance for oil correlation[J].Petroleum Exploration and Development,2004,31(2):35-37.
[24] 张立平,黄第藩,廖志勤.伽马蜡烷:水体分层的地球化学标志[J].沉积学报,1999,17(1):136-140.ZHANG Liping,HUANG Difan,LIAO Zhiqin.Gammacerane:geochemical indicator of water column stratification[J].Acta Sedimentologica Sinica,1999,17(1):136-140.
[25] TEN HAVEN H L,ROHMER M,RULLK?TTER J,et al.Tetrahymanol,the most likely precursor of gammacerane,occurs ubiquitously in marine sediments[J].Geochimica et Cosmochimica Acta,1989,53(11):3073-3079.
[26] 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.
[27] 王大锐.油气稳定同位素地球化学[M].北京:石油工业出版社,2000:174-183.WANG Darui.Stable isotopic geochemistry of oil and gas[M].Beijing:Petroleum Industry Press,2000:174-183.
[28] 李美俊,任平,胡礼国,等.碳同位素类型曲线在辽河盆地油源对比中的应用[J].特种油气藏,2000,7(2):11-13.LI Meijun,REN Ping,HU Liguo,et al.Application of carbon isotope typical curve to oil source correlation in Liaohe Basin[J].Special Oil & Gas Reservoirs,2000,7(2):11-13.
[29] PETERS K E,KONTOROVICH A E,MOLDOWAN J M,et al.Geochemistry of selected oils and rocks from the central portion of the West Siberian Basin,Russia[J].AAPG Bulletin,1993,77(5):863-887.