中山大学学报自然科学版 ›› 2016, Vol. 55 ›› Issue (6): 35-43.

• 研究论文 • 上一篇    下一篇

海拉尔盆地莫达木吉凹陷下白垩统烃源岩地球化学特征研究

杨鹏1,2,任战利2,田涛3,赵筱艳4,祁凯2   

  1. 1.中山大学海洋科学学院∥海洋石油勘探开发广东省普通高校重点实验室,广东 广州 510006;
    2. 西北大学地质学系∥大陆动力学国家重点实验室,陕西 西安 710069;
    3.国土资源部煤炭资源勘查与综合利用重点实验室,陕西 西安 710054;
    4. 长庆油田长庆实业集团有限公司,陕西 西安 710021
  • 收稿日期:2015-12-24 出版日期:2016-11-25 发布日期:2016-11-25
  • 通讯作者: 任战利;E-mail:renzhanl@nwu.edu.cn

The geochemical characteristics of Lower Cretaceous hydrocarbon source rocks in Modamuji depression, Hailaer basin

YANG Peng1,2, REN Zhanli2, TIAN Tao3, ZHAO Xiaoyan4,QI Kai2   

  1. 1. Guangdong Key Laboratory of Offshore Oil Exploration and Development∥School of Marine Science, Sun Yat-sen University, Guangzhou 510006, China;
    2. State Key Laboratory of Continental Dynamics, Northwest University, Xi’an 710069, China;
    3. Key Laboratory of Coal Resource Exploration and Comprehensive Utilization, Ministry of Land and Resources, Xi’an 710054, China;
    4. Changqing Industrial Group of Changqing Oilfield, Xi’an 710021, China
  • Received:2015-12-24 Online:2016-11-25 Published:2016-11-25

摘要:

海拉尔盆地莫达木吉凹陷下白垩统是区域油气勘探潜在目标层系,缺乏对烃源岩地球化学特征的详细研究。通过有机地球化学方法对莫达木吉凹陷下白垩统烃源岩地球化学特征进行了研究,认为南屯组(K1n)和大磨拐河组(K1d)烃源岩有机质类型以Ⅱ2-Ⅲ型为主,差异性主要体现在有机质丰度和成熟度。同时,在恢复埋藏史的基础上建立了研究区主力烃源岩在该地质时期成熟度演化模型,模拟结果显示:大二段烃源岩处于未成熟-低成熟阶,大一段烃源岩处于低成熟阶段;南二段烃源岩处于低成熟-成熟阶段;南一段烃源岩热演化程度相对较高,达到成熟生油气阶段。综合分析得出大磨拐河组(K1d)烃源岩有机质丰度整体较高,但热演化程度低,生烃潜力小;随着埋深的增加,烃源岩热演化程度增加,到南二段(K1n2)开始进入成熟生烃阶段,生烃潜力较大;南一段(K1n1)烃源岩有机质丰度低,为差烃源岩,生烃潜力较小。

关键词: 烃源岩, 有机地球化学特征, 有机质丰度, 有机质类型, 成熟度, 莫达木吉凹陷, 海拉尔盆地

Abstract:

The Lower Cretaceous is the target stratum of potential regional oilgas exploration in the Modamuji Depression, Hailaer Basin. Organic geochemistry methods were applied to study geochemical characteristics of Lower Cretaceous hydrocarbon source rocks from the Modamuji Depression. The results showed that the organic matter of K1n and K1d formation is mainly type Ⅱ2-Ⅲ with various abundance and maturity. The proposed maturity evolution model based on restoration of burial history showed that the thermal evolution extent for main source rocks is generally low. The source rocks from K1d2 are at the immature to low mature stage, those from K1d1 are at low mature stage and those from K1n2 are at low mature to mature stage. The hydrocarbon source rocks from K1n1 showed a relatively high thermal evolution degree, which has reached the mature oil-generating stage. The comprehensive analyses indicated that K1d hydrocarbon source rocks are generally high in organic matters with a low thermal evolution and low hydrocarbongenerating potential. The thermal evolution degree of hydrocarbon source rocks increases with the buried depth. The K1n2 hydrocarbon source rocks have entered the mature oil-generating stage with a moderate organic matter abundance and relatively higher hydrocarbon-generating potential. The hydrocarbon source rocks from K1n1 are low in organic matter with relatively low hydrocarbongenerating potential.

Key words: hydrocarbon source rocks, organic geochemical characteristics , organic matter abundance, organic matter type, maturity, Modamuji depression, Hailaer basin

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