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松辽盆地白垩纪孢粉颜色指数与有机质成熟度 总被引:3,自引:0,他引:3
The relatiouship between posen colour and the degree of maturity of organic material is discussed with regard to petroleum formation and evolution as typified by Daqing oil field in Cretaceous system, central Songliao basin, Northeast China. Colour variation of pollen is considered as a function of sedimentary environment and metamorphism. Pollen colour is divided into seven grades and the degree of metamorphism is studied in terms of this colour index. Results show that the pollen colonr index of the strata at depth of 1000-3000m (stratigraphieally from the first section of Liangjiang formation to the upper Quantou formation) ranges from 2.5 to 5, corresponding to an ancient temperature of 60--140℃. This is the most.optimum strata for oil-generation. Strata beneath the lower Quantou formation under 3000 m with colour index in excess of 5 and ancient temperature of over 140℃ should be favorable for gas accumulation. For strata at shallower depth than 100O m, stratigraphically above the second section of Liengjiang formation, which is characterized by a colour index of 1--1.5 and a temperature of lower than 600℃, the maturity degree is lower than that necessary for oil-generation. 相似文献
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无论孢粉类型还是孢粉数量,昌五地区沙河子组发现的孢粉化石均可称得上是松辽盆地北部同层位中最丰富的。研究区沙河子组自下而上可以划分出两个孢粉组合:克拉梭粉(Classopollis)-拟云杉粉(Piceites)组合和三角瘤面孢(Lophotriletes)-无突肋纹孢(Cicatricosisporites)组合。其组合特征明显,可以作为研究区内地层划分对比的生物地层学依据之一。孢粉组合研究结果表明,沙河子组的地质时代应为早白垩世凡兰吟期-欧特里夫期(Valanginian-Hauterivian)。尽管没有出现最原始的被子植物花粉,但也不排除部分进入巴列姆期(Barremian)的可能。 相似文献
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黑龙江省东部即小兴安岭与张广才岭以东地区,地层区划属于松花江区的老爷岭分区、三江平原分区以及那丹哈达岭区的广大区域内,以往从未发现过晚白垩世沉积地层。在1979年出版的“东北地区区域地层表”中本区晚白垩世地层是个空白,仅出露火山岩即伊林组。 相似文献
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内蒙古海拉尔盆地大磨拐河组孢粉组合 总被引:13,自引:1,他引:13
海拉尔盆地大磨拐河组自下而上可以划分出两个孢粉组合 :哈氏三角孢 -微细云杉粉 ( Deltoidospora hallii-Piceaepollenites exilioides)组合和澳洲无突肋纹孢 -卵形光面单缝孢 ( Cicatricosisporites australiensis- L aevigato-sporites ovatus)组合 ,分别分布于大磨拐河组一段和二段 ,组合特征明显 ,可以作为研究区内地层划分对比的生物地层学依据之一。两个孢粉组合中见有属种繁多的海金沙科孢子及其他繁盛于早白垩世的孢子花粉 ,结合在数以千计的岩心样品中没有发现可靠的早期被子植物花粉的情况分析 ,推测产这两个孢粉组合的大磨拐河组的地质时代为早白垩世凡兰吟期—欧特里沃期 ( Valanginian— Hauterivian) ,不排除部分进入巴列姆期 ( Barrem ian)的可能 相似文献
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