塔里木盆地乌什—温宿地区油源对比与成藏演化  

Oil-source correlation and accumulation evolution in Wushi-Wensu area of Tarim Basin

作　　者：张慧芳[1] 王祥[1] 张科[1] 史超群[1] 凡闪 娄洪 王晓雪 李刚[2] ZHANG Huifang;WANG Xiang;ZHANG Ke;SHI Chaoqun;FAN Shan;LOU Hong;WANG Xiaoxue;LI Gang(Research Institute of Exploration and Development,PetroChina Tarim Oilfield Company,Korla 841000,China;Resources Survey Office,PetroChina Tarim Oilfield Company,Kolar 841000,China)

机构地区：[1]中国石油塔里木油田公司勘探开发研究院,新疆库尔勒841000 [2]中国石油塔里木油田公司资源勘查处,新疆库尔勒841000

出　　处：《天然气地球科学》2022年第1期24-35,共12页Natural Gas Geoscience

基　　金：国家重点研发计划(编号:2019YFC0605505)资助。

摘　　要：塔里木盆地乌什—温宿地区具有良好的勘探前景,然而该区油源认识及成藏演化多年来一直存在争议,制约着该区区带评价和有利目标优选。通过生物标志化合物和碳同位素等参数精细对比,明确研究区油砂抽提物及少部分原油与三叠系黄山街组烃源岩具有良好亲缘关系;大部分原油表现出三叠系和侏罗系烃源岩混源特征,全油碳同位素特征反映其以三叠系来源为主。烃源岩评价及热演化程度与油气成熟度的对比表明,凹陷内烃源岩发育差,现今处于低成熟演化阶段,而该区油气均为成熟油气,故凹陷内烃源岩对该区油气生成并无贡献;凹陷周缘的阿瓦特地区烃源岩发育较好,现今处于成熟—过成熟演化阶段,研究区油气应是从阿瓦特地区远源运聚成藏。综合烃源岩埋藏史、流体包裹体、单井热演化史以及区域构造演化分析表明,乌参1凝析气藏、神木1油藏晚中新世—早上新世形成早期油藏,上新世晚期乌参1凝析气藏受大量天然气充注改造为现今凝析气藏,而神木1油藏因构造差异未受天然气改造,依然保持为油藏。温宿凸起因封盖条件较差,油藏遭受严重生物降解,形成稠油油藏。Wushi-Wenshu area has a good exploration prospect. However,there have been disputes in the recognition of oil source and reservoir formation evolution in this area for many years,which restricted the evaluation of the area and the optimization of favorable targets. Through the fine comparison of parameters such as biomarkers and carbon isotopes,it is clear that the oil sand extract and a small part of crude oil in the study area have a good relationship with the source rocks of the Triassic Huangshanjie Formation. Most of the crude oil shows the characteristics of mixed source rocks of Triassic and Jurassic,and the total oil carbon isotopic characteristics show that it is mainly from Triassic. The evaluation of source rocks and comparison of their thermal evolution degree with the maturity of oil and gas shows that the source rocks in the sag are poorly developed and in the low maturity stage,while the oil and gas in this area are all mature,so the source rocks in the sag do not contribute to the generation of oil and gas in this area. The source rocks in Awate area around the sag are well developed and are now in the mature-over-mature evolution stage. The oil and gas in the study area should be transported and accumulated from Awate area. Comprehensive burial history of source rocks,fluid inclusions,single well thermal evolution history and regional structural evolution analysis indicates that early reservoirs of Wucan 1 and Shenmu 1 were formed in Pliocene,in the Late Pliocene,Wucan 1 was transformed into a condensate gas reservoir by a large number of gas filling,while Shenmu 1 remained oil reservoir due to the structural difference. Due to the poor sealing condition,the reservoirs on Wensu Uplift suffered serious biodegradation and formed heavy oil reservoirs.

关 键 词：乌什凹陷 温宿凸起 油源对比 油气成藏 

分 类 号：TE122.2[石油与天然气工程—油气勘探]