渤海湾盆地东营凹陷孔店组烃源岩特征研究

CHARACTERISTICS OF SOURCE ROCK OF THE KONGDIAN FORMATION IN SOUTH SLOPE OF THE DONGYING SAG, THE BOHAIWAN BASIN

袁彩萍 徐思煌 贾霍甫 王新征 韩忠义

Yuan Caiping Xu Sihuang Jia Huofu Wang Xinzheng Han Zhongyi

中国地质大学, 资源学院, 武汉, 430074 2. 中国石化, 胜利油田现河采油厂, 山东, 东营, 257068

Faculty of Resources, China University of Geosciences, Wuhan, Hubei 430074, China 2. Xianhe Oil Production Plant, Shengli Oilfield, SINOPEC, Dongying, Shangdong 257068, China

沙三下和沙四上是东营凹陷的2套优质烃源岩。目前认为东营凹陷南斜坡原油主要属于“沙四型”,而对于东营凹陷孔店组的生烃潜力一直存在着争论。油源对比结果表明,孔店组烃源岩以较高的伽马蜡烷区别于沙三型烃源岩,又以较高的三升藿烷和C29甾烷S构型区别于沙四型烃源岩;南斜坡孔店组及其以下的深层原油与孔店组烃源岩具有亲缘关系。虽然目前发现的孔店组烃源岩有机质含量较低、类型差、成熟度较高,综合评价较差,但是生物标志化合物显示,向沉积中心其有机质有优化的趋势。因此推测在沉积中心发育更优质的孔店组烃源岩,其生烃潜力不容忽视。

The source rocks of lower Es3 and upper Es4 are high quality source rock in the Dongying Sag of the Bohaiwan Basin.It was considered that the crude oil on south slope of the Dongying Sag mainly came from Es4 source rock;while it was argued that whether Ek2 can generate hydrocarbon.The correlation between oil and source rock shows that Ek2 source rock differs from Es3 source rock with higher gammacerane and differs from Es4 source rock with higher trishomohopane and S configuration of C29 sterane.There is consanguinity between crude oil in deeper layers and Ek2 source rock.Although Ek2 source rock was found belongs to bad source rock with lower organic carbon,poorer type of kerogen and higher maturity,it optimizes toward the sag center based on biomarkers.So it is presumed that there would be good source rock of Ek2 in its sedimentary center,and the genetic potential of Ek2 would be large.

https://doi.org/10.11781/sysydz200602177