塔中北斜坡西部原油类型及主力油源层

CRUDE TYPES AND MAIN SOURCE ROCKS IN WEST PART OF NORTH SLOPE, CENTRAL TARIM

林青 林壬子 王培荣 朱扬明

Lin Qing Lin Renzi Wang Peirong Zhu Yangniing

塔中北斜坡西部原油分为两类:Ⅰ类原油以相对低的三环萜烷/藿烷、孕凿烷/规则甾烷、重排甾烷/规则甾烷比值和高的Ts/Tm,C/C藿烷,C/C规则笛烷为特征;Ⅱ类原油与Ⅰ类原油的生物标志物特征相反.这表明北斜坡西部至少存在两个油源.油、源岩对比结果表明,Ⅰ类原油主要来源于寒武系烃源岩,Ⅱ类原油来源于中上奥陶统泥灰岩.

The oil in the west part of northern slope in Central Tarim Basin can be classified into two types (Ⅰ,Ⅱ) based on the distribution and composition of sterane and terpane. Type-I oil is characterized by relative tow ratio of tricyclic terpanes to hopanes, pregnanes to regular sterane and rearranged steranes to regular sterane, and by relative high ratio of Ts to Tm, C to C sterane and C hopane to C homohopanes. Type-Ⅱ oil has opposite biomarker characters to the type-I oil. The difference implies that there may be at least two oil sources in the study area The correlation between the oils and source rocks indicates that the oil of type-Ⅰ was derived from the Cambrian carbonate source rock,and the oil of type-Ⅱ was derived from the Middle-Upper Ordovician marl source rock.

10.11743/ogg20010214