摘要
准噶尔盆地东北缘陆梁隆起北部至乌伦古坳陷上三叠统白碱滩组分布广泛,厚度大,烃源岩发育,烃源岩主要沿乌伦古坳陷索索泉凹陷伦参1—乌伦1—乌参1井和准北1—泉1—滴北1井一带分布。根据钻井资料,分析研究区烃源岩及油砂样品总有机碳质量分数、生烃潜量、镜质体反射率、干酪根碳同位素、饱和烃色谱、饱和烃色质和芳烃色质等,利用生物标志物进行烃源岩和油源对比。结果表明:乌参1和滴北1井上三叠统白碱滩组烃源岩丰度基本为中等—好,有机质类型主要为Ⅱ_(2)型,部分为Ⅱ_(1)和Ⅲ型;凹陷区烃源岩处于低成熟—成熟阶段,具有较好的生油气潜力。白碱滩组烃源岩与滴北1井八道湾组油砂抽提物生物标志物Pr/Ph约为1.4,几乎不含伽马蜡烷和β-胡萝卜烷,Ts相对于Tm很低,C_(27)、C_(28)、C_(29)规则甾烷相对含量组成中,C_(29)规则甾烷含量最高,C_(27)和C_(28)规则甾烷含量较低,呈反“L”型分布。滴北1井侏罗系八道湾组油砂抽提物生物标志物与上三叠统白碱滩组烃源岩具有良好的亲缘关系,八道湾组原油来源于白碱滩组烃源岩。石英滩凸起东南部—滴北凸起上三叠统—侏罗系为勘探有利区。该结果为上三叠统烃源岩生烃模拟、资源量评价及勘探部署提供依据。
The northern margin of the Junggar Basin is located in the area spanning from the northern part of the Luliang Uplift to the Wulungu Depression.The Upper Triassic Baijiantan Formation is widely distributed in the study area,with large thickness and well development of source rock.The source rock is mostly distributed in the Suosuoquan Sag of the Wulungu Depression,ranging from well Luncan 1 to well Wulun 1,then to well Wucan 1,and from well Zhunbei 1 to well Quan 1,then to well Dibei 1.Based on the drilling well data,this study analyzed their organic carbon mass fraction,hydrocarbon generating potential,vitrinite reflectance,carbon isotope of kerogen,saturated hydrocarbon chromatography,saturated hydrocarbon chromatography and aromatic hydrocarbon chromatography,etc.and utilized biomarker compounds for source rock and oil source comparison.The result shows that the source rock abundance of the Upper Triassic Baijiantan Formation from well Wucan 1 and well Dibei 1 is mostly moderate to good.The organic matter type of most samples isⅡ_(2),and parts of the samples areⅡ_(1)andⅢ.The source rock in the sag area is currently in low maturity to mature stage and has good potential of generating hydrocarbon.Biomarker Pr/Ph of the source rock from Baijiantan Formation and oil-sand extracts from the Jurassic Badaowan Formation of well Dibei 1 is approximately 1.4,with almost no gamma waxane andβ-carotene.The Ts is very low relative to Tm.The C_(27)-C_(28)-C_(29)regular sterane is dominant,whereas C_(27)and C_(28)content is low,displaying an inverse“L”type distribution pattern.The biomarkers of oil-sand extracts from the Jurassic Badaowan Formation of the well Dibei 1 have good affinity with the source rock of the Upper Triassic Baijiantan Formation.The crude oil of the Badaowan Formation originates from the source rock of the Baijiantan Formation.It is proposed that the next step of hydrocarbon exploration should be focused on the Upper Triassic hydrocarbon producing depressions,and the Upper Triassic-Jurassic in the southeastern part of the Shiyingtan Uplift to Dibei Uplift is a favorable area for exploration.Meanwhile,the simulation of hydrocarbon generation and resource evaluation of the Upper Triassic source rocks should be carried out to provide insights for exploration deployments.
作者
余琪祥
周学文
路清华
段铁军
李浩
YU Qixiang;ZHOU Xuewen;LU Qinghua;DUAN Tiejun;LI Hao(Wuxi Petroleum Geology Institute,Research Institute of Petroleum Exploration and Development,SINOPEC,Wuxi,Jiangsu 214126,China;Key Laboratory of Petroleum Accumulation Mechanisms,SINOPEC,Wuxi,Jiangsu 214126,China;Research Institute of Petroleum Exploration and Development,SINOPEC,Beijing 102206,China)
出处
《东北石油大学学报》
CAS
北大核心
2023年第2期44-54,I0003,I0004,共13页
Journal of Northeast Petroleum University
基金
中国石化石油勘探开发研究院项目(YK2019)
中国石化胜利油田分公司项目(P21077-1)。
关键词
准噶尔盆地
陆梁隆起
乌伦古坳陷
上三叠统
白碱滩组
烃源岩
地球化学特征
油源对比
Junggar Basin
Luliang Uplift
Wulungu Depression
Upper Triassic
Baijiantan Formation
hydrocarbon source rock
geochemical characteristics
oil-source rock correlation
