焉耆盆地原油物理化学特征及油源对比研究

STUDY OF THE PHYSICAL AND CHEMICAL CHARACTERISTICS OF THE CRUDE OIL AND OIL-SOURCE CORRELATION IN THE YANQI BASIN

严永新 袁光喜 马蓉芳 古哲 白云飞

Yan Yongxin Yuan Guangxi Ma Rongfang Gu Zhe Bai Yunfei

中国地质大学, 北京, 100083 2. 中国石油化工股份有限公司, 河南油田分公司, 石油勘探开发研究院, 河南, 南阳, 473172

China University of Geosciences, Beijing 100083, China 2. Exploration and Development Research Institute of Henan Oilfield Company, SINOPEC, Nanyang, Henan 473132, China

在焉耆盆地侏罗系三工河组和八道湾组均发现原油,目前关于侏罗系产层原油的油源问题存在不同的认识。对研究区原油的物理、化学性质进行系统的研究,认为侏罗系三工河组和八道湾组原油不仅在物理性质上有一定的差别,而且在地球化学组成及生物标记化合物上也有一定的差异,应具有不同的来源。侏罗系三工河组原油属于典型腐殖型干酪根成因,而侏罗系八道湾组原油除了具有腐殖型干酪根成因的某些特征外,还具有湖相泥岩生烃的特点。通过原油与各类源岩生物标志物进一步对比分析发现,侏罗系三工河组原油与西山窑、三工河组烃源岩及石炭系、三叠系烃源岩地球化学特征均存在明显差异,与侏罗系八道湾组烃源岩对比性较好。侏罗系八道湾组原油与八道湾组、三叠系源岩有一定相似性,因此认为八道湾组源岩为其主要源岩,三叠系源岩也有一定的贡献。目前勘探生产主要以八道湾组烃源岩为目标,下一步应加强对三叠系烃源岩贡献区带的勘探部署。

At present,there are different opinions on the oil sources of the Jurassic net pay in Yanqi Basin,where crude oil has been found in Sangonghe Formation and Badaowan Formation.Through a series of researches on the physical and chemical characteristics of the crude oil in the study area,some differences between the oils in the two Formations have been found not only on the physical properties but also on the geochemical composition and biomarkers.Therefore,the crude oils in the area are considered to have different oil sources.The crude oil in Sangonghe Formation is attributed to typical humic kerogen origin.Besides having the same characteristics with the crude oil in Sangonghe Formation,the crude oil in Badaowan Formation comes from lacustrine mudstone.The further correlation analysis on the crude oil and various biomarkers shows that the crude oil in the Jurassic Sangonghe Formation differs greatly from the source rocks in Xishanyao Formation,Sangonghe Formation,Carboniferous and Triassic on geochemical characteristics,but is correlative with the source rock in Badaowan Formation.It is concluded that the curde oil in Badaowan Formation has good similarity with the source rock in Badao-wan Formation and the Triassic.Up to now,the exploration has been focused on the source rock in(Badaowan)Formation which is believed to be the main source rock.The favorable zones in the Triassic,which is thought to be a secondary source rock,should be paid more attention in next exploration deployment.

https://doi.org/10.11781/sysydz200605467