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产于亚洲、欧洲东部渐新统。Produced in Asia, Eastern Europe Oligocene.

北部湾盆地在中始新世至早渐新世是一个湖泊。Beibu Wan Basin was a lake in the middle Eocence-Lower Oligocene.

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覆盖于穹丘上的沉积岩为渐新世侵蚀所截削。Oligocene erosion had truncated the sediments draped over the dome.

乌伦古河组——早始新世至早渐新世。Late Oligocene and the Ulunguhe Fm. Early Eocene to Early Oligocene.

指出了盆地东部和西部渐新统存在的差异。The differences between Oligocene series in the east and west are demonstrated.

西湖凹陷发育古新统、始新统、渐新统及中新统四大烃源岩系。There are four hydrocarbon source rocks, Palaeocene, Eocene, Oligocene and Miocene.

因此，尼玛盆地的陆相地层时代应为古近纪始新世-渐新世。So, the timing of terrestrial strata can be defined from Eocene to Oligocene in Paleogene.

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在先前的渐新世，草地的面积增大，森林的面积减少。As in the Oligocene before it, grasslands continued to expand and forests to dwindle in extent.

自渐新世，中国东部大陆进入了张裂的大陆边缘阶段。The eastern China Continent has entered into the stage of rifting continental margin since Oligocene.

委内瑞拉奥斯特拉油田的产油层，为渐新世奥菲西那组透镜状砂岩层。In the ostra field, venezuela, oil is produced from lenticular sandstone beds of the oligocene oficina formation.

渐新世纪第三纪始新世与中新世之间的地质纪元，大约从三千八百万年持续到二千五百万年前的一段时间。Oligocene A geological epoch in the Tertiary, between Eocene and Miocene, lasting from about 38 to 25 million years ago.

蒙古渐新世啮齿类化石的新发现表明，亚洲渐新世的松鼠和山河狸与北美的关系要比与欧洲的近。Both the sciurids and aplodontids found from Oligocene of Asia have closer relationships with those of North America than with Europe.

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尕斯库勒渐新统下部油藏中，目前找到的原油主要为低熟油，未熟油与成熟油发现不多。Oils currently discovered in the lower Oligocene reservoirs in Gas Hure are mainly low mature oil, with rare immature and mature oils.

早渐新世以后，南沙地块与婆罗洲地块拼贴，北康盆地整体位于海相环境。After early Oligocene Nansha block with kaliamantan block collided together, the main body of Beikang basin became marine environments.

鱼卡凹陷侏罗系烃源岩在渐新世早期才进入生油门限，至今只有一次油气聚集期。The Jurassic source rocks in Yuka sag entered the oil generation threshold in early Oligocene with only one hydrocarbon accumulation stage.

盆地的主要烃源岩为渐新世—中中新世湖相泥岩以及下海岸平原沉积。The main hydrocarbon source rocks for the basins consist of lacustrine mud and lower coastal plain sediments from Oligocene to Middle Miocene.

然而，这套地层中存在大量始新世-渐新世的孢粉组合，同时赋存有相当数量的时代为渐新世-中新世的鱼化石。However, there are not only a lot of sporopollen assemblages from Eocene to Oligocene but also much more ichthyolite from Oligocene to Miocene.

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包裹体等分析表明，盆地油气运移始于晚渐新世—早中新世，延续至第四纪。Inclusion data shows that the migration of petroleum in the basin initiated from the Late Oligocene to the Early Miocene, up to the Quaternary.

文昌组浮游藻类相对丰度高，表明始新世珠江口古湖的表层水初始生产力高。The high relative abundance of the fossil planktonic algae indicates the high primary surface productivity of the palaeo-lake within the Oligocene.

始新世到渐新世湖泊页岩、渐新世到中新世到湖泊和三角洲页岩都是成熟的矿源岩。Eocene through lower Oligocene lacustrine shales and Oligocene through lower Miocene lacustrine and deltaic coaly shales are the mature source rocks.