川南地区龙马溪组元素地球化学特征及有机质富集主控因素
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摘要
为了研究川南威远—长宁地区龙马溪组古氧化还原条件及有机质富集主控因素,对4口取心井开展了主、微量元素分析。结果表明:(1)威远—长宁地区龙马溪组龙一_1亚段整体富集V、Ni、Ba、Th和U等元素,亏损Cr元素;龙一_2亚段整体富集V、Ba、Th和U等元素,亏损Co和Cr元素。(2)龙一_1亚段沉积初期,研究区为缺氧环境,至中晚期,威远地区演变为贫氧或含氧环境,长宁地区演变为含氧环境。(3)龙一_2亚段沉积时期,威远地区WD204 H井区为稳定的含氧环境,WD201井区仍为贫氧或偶含氧环境,而长宁地区整体处于稳定的含氧环境。(4)龙一_1亚段有机质的富集主要受古氧化还原条件控制,龙一_2亚段有机质的富集主要受古生产力强弱控制。该研究成果对川南地区龙马溪组的页岩气勘探具有重要参考价值。
In order to clarify the paleoredox conditions and the main controlling factors of organic matter enrich-ment of Longmaxi Formation in Weiyuan-Changing areas,southern Sichuan,the analysis of major and trace elements in four coring wells was carried out. The results show that:(1)Long 1_1 sub-member of Longmaxi Formation is rich in elements of V,Ni,Ba,Th and U with the loss of Cr element,while the Long 1_2 sub-member is rich in elements of V,Ba,Th and U with the loss of Cr and Co elements.(2)In the early sedimentary stage of Long 1_1 sub-member,the study area was in anoxic environment,and in the middle and late sedimentary stages,the redox condition evolved into dysoxic or oxic in Weiyuan area,while the environment evolved into oxic in Changning area.(3)In the sedimentary stage of Long 1_2 sub-member,WD204 H well area was steadily in oxic condition and WD201 well area was still in dysoxic or partially oxic condition in Weiyuan area,while the condition was entirely oxic in Changning area.(4)The enrichment of organic matter was mainly controlled by paleoredox condition in Long 1_1 sub-member,while it was controlled by the strength of paleoproductivity in Long 1_2 sub-member. The research results have important reference value for shale gas exploration of Longmaxi Formation in southern Sichuan.
In order to clarify the paleoredox conditions and the main controlling factors of organic matter enrich-ment of Longmaxi Formation in Weiyuan-Changing areas,southern Sichuan,the analysis of major and trace elements in four coring wells was carried out. The results show that:(1)Long 1_1 sub-member of Longmaxi Formation is rich in elements of V,Ni,Ba,Th and U with the loss of Cr element,while the Long 1_2 sub-member is rich in elements of V,Ba,Th and U with the loss of Cr and Co elements.(2)In the early sedimentary stage of Long 1_1 sub-member,the study area was in anoxic environment,and in the middle and late sedimentary stages,the redox condition evolved into dysoxic or oxic in Weiyuan area,while the environment evolved into oxic in Changning area.(3)In the sedimentary stage of Long 1_2 sub-member,WD204 H well area was steadily in oxic condition and WD201 well area was still in dysoxic or partially oxic condition in Weiyuan area,while the condition was entirely oxic in Changning area.(4)The enrichment of organic matter was mainly controlled by paleoredox condition in Long 1_1 sub-member,while it was controlled by the strength of paleoproductivity in Long 1_2 sub-member. The research results have important reference value for shale gas exploration of Longmaxi Formation in southern Sichuan.
引文
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[8]王鹏万,张磊,李昌,等.黑色页岩氧化还原条件与有机质富集机制:以昭通页岩气示范区A井五峰组-龙马溪组下段为例.石油与天然气地质,2017,38(5):933-943.WANG P W,ZHANG L,LI C,et al.Redox conditions and organic enrichment mechanisms of black shale:a case from the Wufeng-Lower Longmaxi Formations in well A in Zhaotong shale gas demonstration area.Oil&Gas Geology,2017,38(5):933-943.
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[10]陈居凯,朱炎铭,崔兆帮,等.川南龙马溪组页岩孔隙结构综合表征及其分形特征.岩性油气藏,2018,30(1):55-62.CHEN J K,ZHU Y M,CUI Z B,et al.Pore structure and fractal characteristics of Longmaxi shale in southern Sichuan Basin.Lithologic Reservoirs,2018,30(1):55-62.
[11]赵圣贤,杨跃明,张鉴,等.四川盆地下志留统龙马溪组页岩小层划分与储层精细对比.天然气地球科学,2016,27(3):470-487.ZHAO S X,YANG Y M,ZHANG J,et al.Micro-layers division and fine reservoirs contrast of Lower Silurian Longmaxi Formation shale,Sichuan Basin,SW China.Natural Gas Geoscience,2016,27(3):470-487.
[12]牟传龙,王秀平,王启宇,等.川南及邻区下志留统龙马溪组下段沉积相与页岩气地质条件的关系.古地理学报,2016,18(3):457-472.MOU C L,WANG X P,WANG Q Y,et al.Relationship between sedimentary facies and shale gas geological conditions of the Lower Silurian Longmaxi Formation in southern Sichuan Basin and its adjacent areas.Journal of Palaeogeography,2016,18(3):457-472.
[13]王涛利,郝爱胜,陈清,等.中扬子宜昌地区五峰组和龙马溪组页岩发育主控因素.天然气地球科学,2018,29(5):616-631.WANG T L,HAO A S,CHEN Q,et al.The study of main factors controlling the development of Wufeng Formation and Longmaxi Formation organic-rich shales in the Yichang area,Middle Yangtze region.Natural Gas Geoscience,2018,29(5):616-631.
[14]TAYLOR S R,MCLENNAN S M.The continental crust:Its composition and evolution.London:Blackwell Scientific Publications,1985:312.
[15]WEDEPOHL K H.Environmental influences on the chemical composition of shales and clays?AHRENS L H,PRESS F,RUNCOM SK,et al.Physics and chemistry of the earth.Oxford:Pergamon,1971:305-333.
[16]WEDEPOHL K H,MERIAN E.The composition of the upper earth's crust and the natural cycles of elements,natural resources.Metals and their Compounds in the Environment.Weinheim:VCH-Verlagsge-sellschaft,1991:3-16.
[17]MCLENNAN S M.Relationships between the trace element composition of sedimentary rocks and upper continental crust.Geochemistry,Geophysics,Geosystems,2001,2(4):154-155.
[18]TRIBOVILLARD N,ALGEO T J,LYONS T W,et al.Trace metals as paleoredox and paleoproductivity proxies:an update.Chemical Geology,2006,232:12-32.
[19]RAISWELL R,BUCKLEY F,BERNER R A,et al.Degree of pyritization of iron as a paleo environmental indicator of bottomwater oxygenation.Journal of Sedimentary Petrology,1988,58(5):812-819.
[20]RAISWELL R,BERNER R A.Pyrite and organic matter in Phanerozoic normal marine shale.Geochimica et Cosmochimica Acta,1986,50(9):1967-1976.
[21]RIMMER S M.Geochemical paleoredox indicators in Devonian Mississippian black shales,Central Appalachian Basin(USA).Chemical Geology,2004,206:373-391.
[22]ROWE H D,LOUCKS R G,RUPPEL S C,et al.Mississippian Barnett Formation,Fortworth Basin.Texas:Bulk geochemical inferences and Mo-TOC constraints on the severity of hydrographic restriction.Chemical Geology,2008,257:16-25.
[23]ALGEO T J,KUWAHARA K,SANO H,et al.Spatial variation in sediment fluxes,redox conditions,and productivity in the Permian-Triassic Panthalassic Ocean.Palaeogeography,Palaerclimatology,Palaerecology,2011,308:65-83.
[24]WIGNALL P B.Black shales.Oxford:Clarendon Press,1994:46.
[25]常华进,储雪蕾,冯连君,等.氧化还原敏感微量元素对古海洋沉积环境的指示意义.地质论评,2009,55(1):91-99.CHANG H J,CHU X L,FENG L J,et al.Redox sensitive trace elements as paleoenvironments proxies.Geological Review,2009,55(1):91-99.
[26]熊小辉,肖加飞.沉积环境的地球化学示踪.地球与环境,2011,39(3):405-414.XIONG X H,XIAO J F.Geochemical indicators of sedimentary environments:a summary.Earth and Environment,2011,39(3):405-414
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