海拉尔盆地乌尔逊、贝尔凹陷优质烃源岩特征

Characteristics of high quality hydrocarbon source rock in Wuerxun and Beier depression of Hailaer Basin

通过岩心观察和取样分析,对海拉尔盆地乌尔逊及贝尔凹陷优质烃源岩发育特征进行精细描述,并与普通烃源岩进行对比。研究表明:1)研究区优质烃源岩与砂岩纵向交互频繁,排烃效率高。优质烃源岩是在还原—强还原环境下沉积形成,而普通烃源岩是在氧化—弱氧化的环境下沉积形成;2)优质烃源岩有机质的赋存状态以层状富集为主,有机质呈平行或基本平行层理分布。而普通烃源岩中有机质分布呈斑块状,分布不均匀,或断续纹层状;3)优质烃源岩生烃潜力大,是普通烃源岩的10倍以上;4)优质烃源岩具有高有机碳和相对低氯仿沥青"A"的特征,反映研究区砂泥互层剖面中优质烃源岩的排烃效率高。

Through observing cores and sampling analysis,the development characteristic of high quality hydrocarbon source rocks of Wuerxun and Beier depression in Hailaer Basin are fine description,and carries on the contrast with the ordinary hydrocarbon source rocks.Research shows that： 1）Research area high quality hydrocarbon source rock and sandstone are longitudinal interactive frequently,and the hydrocarbonexpulsion efficiency is high.High quality hydrocarbon source rocks are formative in the reductivestrong reductive environment,however,the ordinary hydrocarbon source rocks are formative in the oxidized—strong oxidized environment.2）Organic matter of highquality hydrocarbon source rocks is in the form of occurrence layered enrichment,organic matter in parallel or basic parallel bedding distribution.However,organic matter of the ordinary hydrocarbon source rocks is plaques form,uneven distribution,or intermittent layer; 3）The hydrocarbon generating potential of highquality hydrocarbon source rocks is high,which is ordinary hydrocarbon source rocks the 10 times above.4）Highquality hydrocarbon source rocks have the feature of high organic carbon and relatively low chloroform bitumen “A”,which reflect research area in mud interbed of sand section of highquality hydrocarbon source rocks have a high efficiency of hydrocarbonexpulsion.