准噶尔盆地东南缘阜康断裂带及其周缘原油地球化学特征和成因  

Geochemistry,genesis and distribution of crude oils in the Fukang fault zones and their periphery in Junggar Basin

作　　者：刘海磊[1] 李卉[1] 向辉 王学勇[1] 杜社宽[3] LIU Hai-lei;LI Hui;XIANG Hui;WANG Xue-yong;DU She-kuan(Research Institute of Petroleum Exploration and Development,PetroChina Xinjiang Oilfield Company,Kalamay,834000,China;Zhundong Oil Extraction Plant,PetroChina Xinjiang Oil Company,Fukang 831500,China;Key Laboratory of Petroleum Resources,Gansu Province/Key Laboratory of Petroleum Resources Research,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]中国石油新疆油田公司勘探开发研究院,新疆克拉玛依834000 [2]中国石油新疆油田公司准东采油厂,新疆阜康831500 [3]甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室,甘肃兰州730000

出　　处：《天然气地球科学》2020年第2期258-267,共10页Natural Gas Geoscience

基　　金：中国石油天然气集团公司重大科技专项(编号:2017E-0401)资助.

摘　　要：准噶尔盆地东南缘阜康断裂带及其周缘发育典型的复合含油气系统,油气成因复杂,给成藏规律认识和勘探部署带来了不确定性。为加深对这些问题的理解,系统报道了研究区原油地球化学特征并讨论了其成因。结果表明:研究区原油具有相似的山峰型C20-C21-C23三环萜烷及上升型C27-C28-C29甾烷分布特征。尽管如此,结合其他一些地球化学参数,主要是碳同位素和Pr/Ph值,仍可将研究区原油分为3类。其中,Ⅰ类原油在整个研究区都有分布,源自二叠系芦草沟组(平地泉组),典型地球化学特征为δ13C值小于-28‰,Pr/Ph值低于2;Ⅱ类原油来自石炭系,混有二叠系的贡献,主要分布于北三台凸起西部与吉木萨尔凹陷J15井区,典型地球化学特征是δ13C值大于-28‰,Pr/Ph值为1.7~2.5;Ⅲ类原油分布在西泉鼻隆南斜坡和三台凸起西斜坡,为来自侏罗系与二叠系的混源油,δ13C值为-29‰^-26.5‰,Pr/Ph值大于2.5。它们的分布及成因表现为典型的源控特征。据此,建议对研究区的勘探应以烃源岩分布为基础,在隆起及稳定的构造环境寻找大中型油气藏。The Fukang fault zones and their periphery are typically hybrid petroleum systems with complex hydrocarbon genesis in the southeastern Junggar Basin. The complexity results in uncertainties to understand the hydrocarbon accumulation mechanisms and shape oil and gas exploration strategies. To deepen the understanding of these issues,this paper systematically analyzes geochemistry of crude oils in the study area and then discusses the oil genesis. The results show that the crude oil in the study area has similar mountain type C20-C21-C23 tricyclic terpane distribution and rising type C27-C28-C29regular sterane characteristics. Nevertheless,the crude oils in the study area can still be divided into three types based on geochemical difference. Type I crude oil distributes throughout the entire study area,originating from the Permian Lucaogou Formation(equivalent Pingdiquan Formation),with typical geochemical characteristics of δ13C lower than-28‰,Pr/Ph lower than 2. Type II crude oil,originating from the Carboniferous with some Permian contribution,is mainly distributed in the western part of the Beisantai uplift and the Well Ji15 in the Jimsar Sag,with the typical geochemical characteristics of δ13 C higher than-28‰,Pr/Ph between 1.7 to 2.5. Type III crude oil is discovered in the southern slope of Xiquan area and the western slope of Santai Uplift,originating from a mixed source of Jurassic and Permian,with the typical geochemical characteristics of δ13 C between-29‰ and-26.5‰,Pr/Ph higher than 2.5. The distribution and genesis of the crude oils are typical of source control. Based on this result,it is suggested that the exploration of the study area should be focused on the distribution of source rocks,and to locate large-and medium-sized reservoirs in the uplift and stable tectonic setting areas.

关 键 词：复合含油气系统 原油地球化学 油源对比 阜康断裂带 准噶尔盆地 

分 类 号：TE122.113[石油与天然气工程—油气勘探]