渤海湾盆地廊固凹陷烃源岩特征及其发育模式

doi:10.11743/ogg20140305

摘要/Abstract

摘要：

通过对廊固凹陷古近系沙河街组四段-沙河街组三段下亚段烃源岩热解数据、碳氧同位素和分子地球化学参数的深入分析，探讨了不同构造气候条件下低丰度湖相烃源岩的发育机理。岩石热解和干酪根显微组分分析表明沙河街组四段-沙河街组三段下亚段有机质类型主要为Ⅱ型，有机质丰度存在明显差异。结合区域构造-气候背景以及碳氧同位素和分子地球化学参数，建立了沙河街组四段-沙河街组三段下亚段的烃源岩发育模式。沉积于裂陷初始阶段的沙河街组四段烃源岩，其湖盆宽/深比小，气候干热，水体为咸水-半咸水，发育稳定的盐度分层。有机-无机碳同位素的负偏移与较低的Pr/Ph值反映了相对低的古生产力和较好的保存条件。沙河街组三段下亚段烃源岩沉积于强烈裂陷阶段，湖盆宽/深大，气候温暖湿润，水体为淡水，上、下水体交换相对频繁，发育不稳定的温度分层，碳同位素正偏移以及C₂₇/C₂₉甾烷的变化反映了生产力增高和陆源有机质输入增多。

关键词: 碳同位素, 氧同位素, 生物标志物, 发育模式, 湖相烃源岩, 廊固凹陷, 渤海湾盆地

Abstract:

Rock-Eval data,carbon and oxygen isotopes and molecular geochemical parameters of the source rocks in Es⁴(the 4^th member of Paleogene Shahejie Fm)-the lower Es³(the 3^rd member of Paleogene Shahejie Fm)in Langgu Sag were integrated to study the formation mechanism of lacustrine source rocks with low abundance under different tectonic and climatic conditions.Rock pyrolysis and kerogens' maceral composition analysis revealed that the Es⁴ and the lower Es³ are the similar in the major kerogen type of Ⅱ,but are quite different in organic matter abundance.Based on analyses of carbon and oxygen isotopes in the context of regional tectonic and palaeo-climate settings,we established depositional models for the source rocks in Es⁴-lower Es³.The source rock in the Es⁴ was deposited in a lake basin at the initial stage of rifting,with low width/depth ratio,arid climate,and brackish water or saline water with stable salinity stratification.Its ¹³C-depleted of the inorganic and organic matter and lower Pr/Ph might reflect relatively low primary productivity and better organic preservation.In contrast,the source rock in the lower Es³ was deposited in a lake basin in the intense rifting stage,with a high width/depth ratio,warm and humid climate,fresh water,and frequent water-column overturning with unstable temperature stratification.Its ¹³C enrichment of the inorganic and organic matter and C₂₇/C₂₉ sterane ratios were interpreted to be caused by higher primary productivity and more terrigenous organic matter input.

Key words: carbon isotope, oxygen isotope, biomarker, depositional model, lacustrine source rock, Langgu Sag, Bohai Bay Basin

中图分类号:

TE122.1

刁帆,邹华耀,郝芳,等. 渤海湾盆地廊固凹陷烃源岩特征及其发育模式[J]. 石油与天然气地质, 2014, 35(3): 326-335. doi: 10.11743/ogg20140305 Diao Fan,Zou Huayao,Hao Fang,et al. Characteristics and depositional models of source rocks in Langgu Sag,Bohai Bay Basin[J]. Oil & Gas Geology, 2014, 35(3): 326-335. doi: 10.11743/ogg20140305

参考文献

[1] Carroll A R,Bohacs K M.Lake-type controls on petroleum source rock potential in nonmarine basins[J].AAPG Bulletin,2001,85(6):1033-1053.
[2] Goncalves F T T.Organic and isotope geochemistry of the Early Cretaceous rift sequence in the Camamu Basin,Brazil:paleolimnological inferences and source rock models[J].Organic Geochemistry,2002,33(1):67-80.
[3] Harris N B,Freeman K H,Pancost R D,et al.The character and origin of lacustrine source rocks in the Lower Cretaceous synrift section,Congo Basin,west Africa[J].AAPG Bulletin,2004,88(8):1163-1184.
[4] Katz B J.Lacustrine basin hydrocarbon exploration-current thoughts[J].Journal of Paleolimnology,2001,26(2):161-179.
[5] Meyers P A,Lallier-Vergès E.Lacustrine sedimentary organic matter records of Late Quaternary paleoclimates[J].Journal of Paleolimnology,1999,21(3):345-372.
[6] Talbot M R,Kelts K.Paleolimnological signatures from carbon and oxygen isotopic ratios in carbonates from organic carbon-rich lacustrine sediments[J].AAPG Memoir,1990,50:99-112.
[7] Tänavsuu Milkeviciene K,Frederick Sarg J.Evolution of an organic-rich lake basin-stratigraphy,climate and tectonics:Piceance Creek basin,Eocene Green River Formation[J].Sedimentology,2012,59(6):1735-1768.
[8] 刘传联.东营凹陷沙河街组湖相碳酸盐岩碳氧同位素组分及其古湖泊学意义[J].沉积学报,1998,16(3):109-114. Liu Chuanlian.Carbon and oxygen Isotopic compositions of lacustrine carbonates of the Shahejie Formation in the Dongying depression and their Paleolimnological significance[J].Acta SsdimentoLogica Sinica,1998,16(3):109-114.
[9] 张善文.准噶尔盆地哈拉阿拉特山地区风城组烃源岩的发现及石油地质意义[J].石油与天然气地质,2013,34(2):145-152. Zhang Shanwen.Identification and its petroleum geologic significance of the Fengcheng Formation source rocks in Hala'alt area,the northern margin of Junggar Basin[J].Oil & Gas Geology,2013,34(2):145-152.
[10] 白玉彬,赵靖舟,赵子龙,等.鄂尔多斯盆地志丹地区延长组长7致密油成藏条件与成藏特征[J].石油与天然气地质,2013,34(5):631-639. Bai Yubin,Zhao Jingzhou,Zhao Zilong,et al.Accumulation conditions and characteristics of the Chang 7 tight oil reservoir of the Yanchang Formation in Zhidan area,Ordos Basin[J].Oil & Gas Geology,2013,34(5):631-639.
[11] 蔡希源.湖相烃源岩生排烃机制及生排烃效率差异性——以渤海湾盆地东营凹陷为例[J].石油与天然气地质,2012,33(3):329-334. Cai Xiyuan.Hydrocarbon generation-expulsion mechanisms and efficiencies of lacustrine source rocks:a case study from the Dongying sag,Bohai Bay Basin[J].Oil & Gas Geology,2012,33(3):329-334.
[12] 朱晓军,蔡进功.泥质烃源岩的比表面与有机质关系研究进展及意义[J].石油与天然气地质,2012,33(3):375-384. Zhu Xiaojun,Cai Jingong.Progress and significance of research on relation between specific surface area and organic matter in argillaceous source rocks[J].Oil & Gas Geology,2012,33(3):375-384.
[13] 张文朝,崔周旗,韩春元,等.冀中坳陷老第三纪湖盆演化与油气[J].古地理学报,2001,3(1):45-54. Zhang Wenchao,Cui Zhouqi,Han Chunyuan,et al.Sedimentary structural characteristics and hydrocarbon distributed rules of Jizhong Depression[J].Acta Geologica Sinica,2008,82(8):1103-1112.
[14] 吴小洲.冀中廊固凹陷含油气系统[J].勘探家,2000,5(3):71-74. Wu Xiaozhou.Petroleum systems of Langgu sag[J].Petroleum Explorationist,2000,5(3):71-74.
[15] 陶明华,王开发,郑国光,等.冀中拗陷早第三纪孢粉组合及地质时代讨论[J].微体古生物学报,2001,18(3):274-292. Tao Minghua,Wang Kaifa,Zhen Guoguang.Early Tertiary sporopollen assemblages from Jizhong Depression and their stratigraphic implication[J].Acta Micropalaeontologica Sinica,2001,18(3):274-292.
[16] Talbot M R.A review of the palaeohydrological interpretation of carbon and oxygen isotopic ratios in primary lacustrine carbonates[J].Chemical Geology(Isotope Geoscience Section),1990,80(4):261-279.
[17] 王起琮,张阳,肖玲.鄂尔多斯盆地奥陶系碳酸盐岩成岩相碳、氧稳定同位素特征[J].石油与天然气地质,2013,34(5):652-658. Wang Qicong,Zhang Yang,Xiao Ling.Carbon and oxygen stable isotopic features of diagenetic facies of Ordovician carbonate rocks in Ordos Basin[J].Oil & Gas Geology,2013,34(5):652-658.
[18] Kelts K,Talbot M.Lacustrine carbonates as geochemical archives of environmental change and biotic/abiotic interactions[C]//Tilzer M M,Serruya C.Large Lakes.Wisconsin:Madison,1990:288-315.
[19] Drummond C N,Wilkinson B H,Lohmann K C,et al.Effect of regional topography and hydrology on the lacustrine isotopic record of Miocene paleoclimate in the Rocky Mountains[J].Palaeogeography,1993,101(1-2):67-79.
[20] 邓宏文,钱凯.沉积地球化学与环境分析[M].兰州:甘肃科学技术出版社,1993. Deng Hongwen,Qian Kai.Sedimentary geochemistry and paleoenviro-nmental analysis[M].Lanzhou :Ganshu Seience and Technology Press,1993:22-25.
[21] Hayes J M,Popp B N,Takigiku R,et al.An isotopic study of biogeochemical relationships between carbonates and organic carbon in the Greenhorn Formation[J].Geochimica et Cosmochimica Acta,1989,53:2961-2972.
[22] Kelts K.Environments of deposition of lacustrine petroleum source rocks:an introduction[J].Geological Society,1988,40(1):3-26.
[23] Curiale J A,Gibling M R.Productivity control on oil shale formation-Mae Sot Basin,Thailand[J].Organic geochemistry,1994,21(1):67-89.
[24] Hollander D J,Mckenzie J A,Haven H L T.A 200-year sedimentary record of progressive eutrophication in Lake Greifen (Switzerland):implications for the origin of organic-carbon-rich sediments[J].Geo-logy,1992,20:825-828.
[25] Wong W W,Sackett W M.Fractionation of stable carbon isotopes by marine phytoplankton[J].Geochimica et Cosmochimica Acta.1978,42(12):1809-1815.
[26] Deuser W G.Isotopic evidence for diminishing supply of available carbon during diatom bloom in the Black Sea[J].Nature,1970,225(5237):1069-1071.
[27] Knoll A H,Summons R E,Waldbauer J R,et al.The geological succession of primary producers in the oceans[J].Evolution of Primary Producers in the Sea,2007:133-163.
[28] Volkman J K,Barrett S M,Blackburn S I,et al.Microalgal biomar-kers:a review of recent research developments[J].Organic Geochemi- stry,1998,29(5):1163-1179.
[29] Sepúlveda J,Wendler J,Leider A,et al.Molecular isotopic evidence of environmental and ecological changes across the Cenomanian-Turonian boundary in the Levant Platform of central Jordan[J].Organic Geochemistry,2009,40(5):553-568.
[30] Frimmel A,Oschmann W,Schwark L.Chemostratigraphy of the Posidonia Black Shale,SW Germany:I.Influence of sea-level variation on organic facies evolution[J].Chemical Geology,2004,206(3):199-230.
[31] Sinninghe Damsté J 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.
[32] Sepúlveda J,Wendler J,Leider A,et al.Molecular isotopic evidence of environmental and ecological changes across the Cenomanian-Turonian boundary in the Levant platform of central Jordan[J].Organic Geochemistry,2009,40(5):553-568.
[33] Summons R E,Hope J M,Swart R,et al.Origin of Nama Basin bitumen seeps:Petroleum derived from a Permian lacustrine source rock traversing southwestern Gondwana[J].Organic Geochemistry,2008,39(5):589-607.
[34] 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].AAPG Bulletin,1999,83(12):1980-2005.
[35] Jiamo F,Guoying S,Jiayou X,et al.Application of biological markers in the assessment of paleoenvironments of Chinese non-marine sediments[J].Organic Geochemistry,1990,16(4):769-779.
[36] Eugster H P,Hardie L A.Sedimentation in an ancient playa-lake complex:the Wilkins Peak Member of the Green River Formation of Wyoming[J].Geological Society of America Bulletin,1975,86(3):319-334.
[37] Demaison G J,Moore G T.Anoxic environments and oil source bed genesis[J].Organic Geochemistry,1980,2(1):9-31.
[38] Kirkland D W,Evans R.Source-rock potential of evaporitic environment[J].AAPG Buuetin,1981,65.
[39] Powell T G.Petroleum geochemistry and depositional setting of lacustrine source rocks[J].Marine and Petroleum Geology,1986,3(3):200-219.
[40] Talbot M R.The origins of lacustrine oil source rocks:evidence from the lakes of tropical Africa[J].Geological Society,1988,40(1):29-43.
[41] Katz B J.Controls on distribution of lacustrine source rocks through time and space[C]//Lacustrine basin exploration:case studies and mod ern analogs,AAPG Memoir.1990,61-76.
[42] Olsen P E.Tectonic,climatic,and biotic modulation of lacustrine ecosystems-examples from Newark Supergroup of eastern North America[C]//Lacustrine basin exploration:Case studies and modern analogs,AAPG Memoir.1990,50:209-224.
[43] Jones R W.Organic facies[M].London:Academic Press,1987,1-90.