现代地质2011，Vol.25Issue(4)：668-674,7.
内蒙古海拉尔盆地乌尔逊凹陷热演化史
Thermal History of Wuerxun Depression in Hailaer Basin, Inner Mongolia
摘要
Abstract
Wuerxun depression is a sag with a high degree exploration in the south of Hailaer basin, Inner Mongolia. It is the main oil-gas-bearing depression in which the deposit thickness is big, and the stratum grows entirely, and the oil-generating condition is very superior. The main source rock is Nantun Formation, and the next is Tongbomiao Formation and Damoguaihe Formation. The average paleogeothermal gradient recovered by the fission track method is about 3. 44 ℃/hm, which is close to present geothermal gradient (3. 3 ℃/hm). The results of paleotemperature and thermal history simulation show that Wuerxun depression has been undergone a heating process since Mesozoic Era, and the maturity of the source rock is controlled by present geothermal field. The geothermal history and illite dating results reveal that the formation of oil-gas reservoirs have two stages in Wuerxun depression, which are in the late period of Early Creaceous and since Tertiary, and the late period of Early Creaceous is the main stage, and the second stage is since Tertiary. The source rock began to generate oil and gas in a second peak since Tertiary. The second stage is important for the formation and concentration of oil-gas reservoirs in Wuerxun depression.关键词
海拉尔盆地/乌尔逊凹陷/地温梯度/磷灰石裂变径迹/热演化史Key words
Hailaer basin/ Wuerxun depression/ geothermal gradient/ apatite fission track/ geothermal history分类
能源科技引用本文复制引用
崔军平,任战利..内蒙古海拉尔盆地乌尔逊凹陷热演化史[J].现代地质,2011,25(4):668-674,7.基金项目
国家自然科学青年基金项目(41002040) （41002040）
西北大学大陆动力学国家重点实验室项目(BJ11055). （BJ11055）
