| 海拉尔盆地呼和湖凹陷下白垩统烃源岩地球化学特征及热演化史 |
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| 引用本文： | 崔军平,赵金,任战利,金玮,邢隆,王育强.海拉尔盆地呼和湖凹陷下白垩统烃源岩地球化学特征及热演化史[J].地球科学,2020,45(1):238-250. |
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| 作者姓名： | 崔军平 赵金 任战利 金玮 邢隆 王育强 |
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| 作者单位： | 1.西北大学地质学系, 陕西西安 710069 |
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| 基金项目： | 国家自然科学基金重点项目41630312国家自然科学基金面上项目41772121国家自然科学基金青年项目41002040大陆动力学国家重点实验室自主研究项目Bj11055大陆动力学国家重点实验室自主研究项目201210123 |
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| 摘 要： | 呼和湖凹陷下白垩统烃源岩生油条件好，油气资源潜力大.利用研究区7口钻井270个热解资料和125个镜质体反射率数据，分析了下白垩统烃源岩地球化学特征及热演化史.下白垩统烃源岩有机质类型主要为Ⅲ-Ⅱ2型干酪根，现今热演化程度具有中间高、四周低的特点.主力烃源岩层南屯组属于中等-好烃源岩，在约128 Ma进入生烃门限，现今处于高成熟-生气阶段.大磨拐河组属于差-中等烃源岩，在约124 Ma进入生烃门限，现今处于中等-低成熟阶段，大磨拐河组二段烃源岩至今未进入生烃高峰.热史模拟表明呼和湖凹陷在伊敏组沉积晚期达到最大古地温，地温演化具有先升高后降低的特点.从南屯组沉积至今，地温梯度先升高到50~55℃/km，后逐渐降低为现今的35.4℃/km.早白垩世以来较高的地温场对油气生成、成藏起控制作用.包裹体均一温度结合热演化史结果表明126~87 Ma（伊敏组沉积时期）应是呼和湖凹陷油气主成藏期.晚白垩世以来盆地发生抬升，温度降低，烃源岩生烃强度减弱.
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| 关 键 词： | 海拉尔盆地 呼和湖凹陷 烃源岩 地球化学特征 热演化史 油气主成藏期 石油地质 |
| 收稿时间： | 2018-08-02 |
Geochemical Characteristics of Lower Cretaceous Source Rocks and Thermal History in the Huhehu Depression,Hailar Basin |
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| Abstract: | The Huhehu depression, located in the southern of Hailar basin, has favorable oil generating conditions. 270 pyrolysis data and 125 vitrinite reflectance data from 7 wells in the study area are used to analyze the geochemical characteristics and thermal history of Lower Cretaceous source rocks. Results show that the organic matter types of the Lower Cretaceous source rocks are mainly kerogen type Ⅲ-Ⅱ2, and the thermal maturity of the source rocks is characterized by high in the middle and low on all sides. The Nantun Formation belongs to the medium-good source rock with high maturity, which entered the threshold of hydrocarbon generation about 128 Ma, now in high mature to gas generation stage. The Damoguaihe Formation belongs to the poor-medium source rock, which entered the hydrocarbon generating threshold about 124 Ma, and now in the medium to low mature stage, the second member hydrocarbon source rock of Damoguaihe Formation has not entered the peak of hydrocarbon generation up to now. The simulation results of thermal history show that the Huhehu depression has reached the maximum paleogeotemperature at the end of the sedimentary period of Yimin Formation, and the geothermal evolution has the characteristics of increase firstly and then decrease. From the beginning of the Nantun Formation, the geothermal gradient gradually increased to 50-55℃/km, and then decreased to 35.4℃/km now. The higher geothermal field since the Early Cretaceous controlled the formation and accumulation of oil and gas. The inclusion homogenization temperatures and thermal history results indicate that 126-87 Ma(the sedimentary period of Yimin Formation)should be the main hydrocarbon accumulation period in Huhehu depression. As the strata were denuded, and the temperature decreased, the hydrocarbon generated and hydrocarbon expulsed process became weak due to the uplift of the Hailar basin since Late Cretaceous. |
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