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
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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(K_1n)和大磨拐河组(K_1d)烃源岩有机质类型以Ⅱ_2-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(K_1d)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(K_1n_2)开始进入成熟生烃阶段,生烃潜力较大;南一段(K_1n_1)烃源岩有机质丰度低,为差烃源岩,生烃潜力较小。
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 K_1n and K_1d 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 K_1d_2 are at the immature to low mature stage,those from K_1d_1 are at low mature stage and those from K_1n_2 are at low ma-ture to mature stage. The hydrocarbon source rocks from K_1n_1 showed a relatively high thermal evolution degree,which has reached the mature oil-generating stage. The comprehensive analyses indicated that K_1d 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 K_1n_2 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 K_1n_1 are low in organic matter with relatively low hydrocarbon-generating potential.
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 K_1n and K_1d 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 K_1d_2 are at the immature to low mature stage,those from K_1d_1 are at low mature stage and those from K_1n_2 are at low ma-ture to mature stage. The hydrocarbon source rocks from K_1n_1 showed a relatively high thermal evolution degree,which has reached the mature oil-generating stage. The comprehensive analyses indicated that K_1d 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 K_1n_2 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 K_1n_1 are low in organic matter with relatively low hydrocarbon-generating potential.
引文
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[28]任战利.中国北方沉积盆地构造热演化史研究[M].北京:石油工业出版社,1999:1-50.
[29]任战利,田涛,李进步,等.沉积盆地热演化史研究方法于叠合盆地热演化史恢复研究进展[J].地球科学与环境学报,2014,36(3):1-20.
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[31]田涛,任战利,马国福,等.雅布赖盆地萨尔台凹陷烃源岩地球化学特征、成熟度演化与油气关系[J].地球物理学进展,2014,29(6):2745-2753.
[32]崔军平,任战利.海拉尔盆地热演化史与油气成藏史研究[D].西安:西北大学,2004.
[2]任战利.沉积盆地热演化史研究新进展[J].地球科学进展,1992,7(3):43-48.
[3]PETERSEN H I,ANDERSEN C,HOLME A C,et al.Vitrinite reflectance gradients of deep wells with thick chalk sections and high pressure:Implications for source for rock maturation,Danish-Norwegian Central,North Sea[J].International Journal of Coal Geology,2012,100:65-81.
[4]蒋国豪,胡瑞忠,方维萱.镜质体反射率(RO)推算古地温研究进展[J].地质地球化学,2001,29(4):40-44.
[5]袁玉松,朱传庆,胡圣标.江汉盆地热流史、沉积盆地构造演化与热事件[J].地球物理学进展,2007,2(3):934-939.
[6]张吉光,彭威,王志国.海拉尔盆地断陷比较评价与勘探方向[J].中国石油勘探,2007(4):6-13.
[7]刘树根,罗志立,赵锡奎,等.内蒙古海拉尔盆地演化研究[J].成都地质学院学报,1993,20(2):78-86.
[8]黄清华,赵来时,卢占武,等.内蒙古海拉尔盆地大磨拐河组孢粉化石及时代浅析[J].地质科技情报,2006,25(1):19-26.
[9]崔军平,任战利,陈玉林.海拉尔盆地贝尔凹陷热演化史与油气关系研究[J].沉积学报,2010,29(2):388-394.
[10]崔军平,任战利,苏勇,等.海拉尔盆地现今地温场与油气关系[J].石油勘探与开发,2007,33(4):445-450.
[11]崔军平,任战利,肖晖,等.海拉尔盆地地温分布及控制因素研究[J].地质科学,2007,42(4):656-665.
[12]陈守田,刘招君,崔凤林,等.海拉尔盆地含油气系统[J].吉林大学学报(地球科学版),2002,32(2):151-154.
[13]陈守田,刘招君,刘杰烈.海拉尔盆地构造样式分析[J].吉林大学学报(地球科学版),2005,35(1):39-42.
[14]张吉光.海拉尔盆地构造特征与含油气性探讨[J].大庆石油地质与开发,1992,11(1):14-20.
[15]张吉光.海拉尔盆地不整合面的确定与油气地质意义[J].大庆石油地质与开发,2002,21(5):8-10.
[16]陈均亮,吴河勇,朱德丰,等.海拉尔盆地构造演化及油气勘探前景[J].地质科学,2007,42(1):147-159.
[17]侯海涛,申家年.海塔盆地中部断陷带烃源岩地球化学特征研究[D].大庆:东北石油大学,2013.
[18]张长俊,龙永文.海拉尔盆地沉积相特征与油气分布[M].北京:石油工业出版社,1995:1-8.
[19]王青海,陈守田,唐建人.海拉尔盆地油气勘探开发前景[J].中国石油勘探,2002,7(3):16-19.
[20]郝胜发.莫达木吉煤田中部井田的地质规律与煤岩特征[J].理论视野,2011(1):271.
[21]候读杰,冯子辉.油气地球化学[M].北京:石油工业出版社,2011:169-200.
[22]邬立言,顾信章.热解技术在我国生油岩研究中的应用[J].石油学报,1986,7(2):13-19.
[23]尚慧芸,李晋超.陆相生油岩有机质的丰度及类型[J].石油学报,1981,2(4):8-16.
[24]查明,赵永军,毛超林,等.生油岩热解生烃潜力及生烃动力学研究[J].地质论评,1994,40(增刊):63-69.
[25]陈建平,黄第藩,陈建军.酒东盆地油气生成和运移[M].北京:石油工业出版社,1996:14-31.
[26]曹庆英.透射光下干酪根显微组分鉴定及类型划分[J].石油勘探与开发,1985(5):14-23.
[27]涂建琪,王淑芝,费轩冬.干酪根有机质类型划分的若干问题的探讨[J].石油实验地质,1998,20(2):187-191.
[28]任战利.中国北方沉积盆地构造热演化史研究[M].北京:石油工业出版社,1999:1-50.
[29]任战利,田涛,李进步,等.沉积盆地热演化史研究方法于叠合盆地热演化史恢复研究进展[J].地球科学与环境学报,2014,36(3):1-20.
[30]任战利,崔军平,李进步,等.鄂尔多斯盆地渭北隆起奥陶系构造-热演化史恢复[J].地质学报,2014,88(11):2044-2056.
[31]田涛,任战利,马国福,等.雅布赖盆地萨尔台凹陷烃源岩地球化学特征、成熟度演化与油气关系[J].地球物理学进展,2014,29(6):2745-2753.
[32]崔军平,任战利.海拉尔盆地热演化史与油气成藏史研究[D].西安:西北大学,2004.