APPROACH ON THE RELATION AMONG ANOXIC ENVIRONMENT, SOURCE ROCKS AND SUBAQUEOUS VOLCANIC ACTIVITY OF LOWER PALEOZOIC IN NORTH DABA AREA
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摘要: 早古生代拉张断陷的形成和演化,伴有海底水下火山活动,及含有机质较高的泥质岩、硅质岩等沉积。油源岩主要在该阶段发育,其有机质的含量高。氟和黄铁矿中δ34S值表明该区的油源岩与水下火山活动相关。火山作用过程中,能喷出大量的H2S、SO2、SO3、CO2及CH4等气体,除CH4气外,均能溶于水,且和水中的氧和水起化学反应,致使海水缺氧和发生重力分异而使海水分层。缺氧海水分布于下部,为有机质的保存提供了一个良好的还原环境。CH4气大部份进入大气圈,发生氧化燃烧反应,生成大量的H2O和CO2且放出大量的热,这种作用能促进生物的大量繁荣,为油气的形成提供更多的物质基础。Abstract: Lower Paleozoic of North Daba area consists of volcanic rocks,orga-nic-rich argillaceous rocks and siliceous rocks.Its kerogen type is sapr-opelic with high content of organics.The source rocks are rich in fluor-ine and sulfur,and bear a direct relation to subaqeous volcanic activity as indicated by fluorine and s34S of pyrite.Large quantity of H2S,SO2,SO3,and CO2 were extruded in the process of subaqeous volcanism,which caused chemical action with oxygen and water,and gravity differentiation of sea water,and provided good conditions for organic pres-ervation.As CH4 entered atomsphere,combution took place with heat release,growth was promoted,which would provide material basis for oil and gas generation.
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[1] 朱夏,1986,论中国含油气盆地构造,石油工业出版社。 [2] Walter E.Dean. George E.Claypool. 1984,Accumulation of oiganic matter in cretaceous oxygen-deficient de Positional envitiromeat is the central pacif is Ocean,Org.Geochem. Vol.7,No.1,p.39-51. [3] 陈昌明等,1980.渤海裂谷系的沉积一构造演化及其有关的油气聚集,中国科学,第10期。 [4] 高长林,1988,试论大巴地区的油气远景,石油实验地质,第10卷,第3期. [5] 秦德余.吉让寿等,1987,秦岭一大巴拗拉槽,石油实验地质,第9卷,第2期. [6] Gudmundur E.Sigvaldason,1974,Physial Volcanology,chapter 9,Chemical composition oI volcanic gases,p.215-238. [7] 黄瑞华,1981,石油无机成因说的新进展,石油实验地质,第3卷,第1期. [8] 陈洪洲,1986,香烟与火山,地球,第2期. [9] 章梅芳,孙辰龄编,1983,无机化学,下册,高等教育出版社. [10] 南京大学地质系编,1979,地球化学,科学出版社. [11] 刘东主,1939,我习也方生贰窗勺也球七笋可砚,地球化学,第1期. -
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