Mesozoic and Cenozoic Thermal History and Source Rock Thermal Evolution History in the Chagan Sag, Inner Mongolia
详细信息
- 责任者：Zuo Yinhui (Research Institute of Exploration and Development ; Zhongyuan Oilfield ; SINOPEC ; Puyang 457001 ; China) ; Ma Weimin
- 刊名：Earth Science
- 出版年：2013
- 卷期：38(3)
- 关键词：烃源岩 ; source rocks ; 热史 ; thermal history ; 二连盆地 ; Erlian Basin
- 页码：p.553-560
- 图表：illus., 26 refs.
- 分类号：1003
- issnNo：ISSN1000-2383
- isbnNo：CN42-1233/P
摘要
The Chagan sag has the greatest potential for oil and gas exploration among other sags in the Yin’gen-Ejinaqi basin.To reveal the Mesozoic and Cenozoic thermal history and source rock thermal evolution history in the Chagan sag,the thermal history was modeled on basis of vitrinite reflectance data of 9 wells.The modeled results show the thermal gradients increased gradually from the Early Cretaceous Bayin’gebi Formation to the end of the Yin’gen Formation,and the thermal gradients reached maximum values(50-58 ℃/km)at the end of the Yingen Formation.Then the thermal gradients decreased gradually from the Late Cretaceous Wulansuhai Formation to the present day,and the thermal gradients is only 31-34 ℃/km in the present day.Meanwhile,based on the above thermal gradient data,with combination of the depositional and tectonic development history and geochemical parameters of source rocks,maturation histories of 3 sets of source rocks of 9 wells were modeled.The modeled results show the maturation histories were controlled by the palaeogeothermal,and the maturation of 3 sets of source rocks reached maximum values in the late period of the Early Cretaceous.
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