摘要
基于准噶尔盆地中央坳陷西部下二叠统风城组烃源岩有机地球化学、天然气组分和稳定碳同位素组成等分析数据,结合区域沉积环境与生烃演化模拟实验,评价风城组烃源岩的生气潜力,刻画规模有效源灶分布,厘定天然气成因来源,优选有利勘探领域。结果表明:(1)风城组为1套倾油型烃源岩,但滞留液态烃有利于晚期裂解成气,具有生气潜力大、晚期规模成藏的特点;(2)风城组烃源岩最大厚度可达900 m,盆1井西凹陷和沙湾凹陷已进入规模生气阶段,生气强度大于20×10^(8) m^(3)/km^(2)的面积约6 500 km^(2);(3)环中央坳陷西部发现的碳同位素组成较轻的天然气主要为来自风城组烃源岩的高熟油型气,其他则为来自于石炭系煤系烃源岩的煤成气;(4)中央坳陷西部天然气勘探需重点关注源边构造型、源边地层型、源内页岩气型和源内构造型4种类型的有利勘探领域,其勘探潜力值得期待。
Based on the organic geochemical data and the component and stable carbon isotopic composition of natural gas of the Lower Permian Fengcheng Formation in the western Central Depression of Junggar Basin,combined with sedimentary environment analysis and hydrocarbon generation simulation,the gas-generating potential of the Fengcheng source rock is evaluated,the distribution of large-scale effective source kitchen is described,the genetic types of natural gas are clarified,and four types of favorable exploration targets are selected.The results show that:(1)The Fengcheng Formation is a set of oil-prone source rock,and the retained liquid hydrocarbon is conducive to late cracking into gas,with characteristics of high gas-generating potential and late accumulation;(2)The maximum thickness of Fengcheng source rock reaches 900 m.The source rock has entered the main gas-generating stage in Well Pen-1 western and Shawan sags,and the area with gas generation intensity greater than 20×10^(8) m^(3)/km^(2) is approximately 6500 km^(2).(3)Around the western Central Depression,highly mature oil-type gas with light carbon isotope composition was identified to be derived from the Fengcheng source rocks mainly,while the rest was coal-derived gas from the Carboniferous source rock;(4)Four types of favorable exploration targets with exploration potential were developed in the western Central Depression which are structural traps neighboring to the source,stratigraphic traps neighboring to the source,shale-gas type within the source,and structural traps within the source.
作者
唐勇
胡素云
龚德瑜
尤新才
李卉
刘海磊
陈轩
TANG Yong;HU Suyun;GONG Deyu;YOU Xincai;LI Hui;LIU Hailei;CHEN Xuan(PetroChina Xinjiang Oilfield Company,Karamay 834000,China;Yangtze University,Wuhan 430100,China;Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China)
出处
《石油勘探与开发》
EI
CAS
CSCD
北大核心
2024年第3期490-500,512,共12页
Petroleum Exploration and Development
基金
国家自然科学基金项目(41802177、42272188)
中国石油前瞻性基础性技术攻关项目(2021DJ0206、2022DJ0507)
中国石油直属院所基础科学研究和战略储备技术研究基金(2020D-5008-04)。
关键词
准噶尔盆地
中央坳陷西部
下二叠统风城组
生气潜力
气源对比
勘探领域
Junggar Basin
western Central Depression
Lower Permian Fengcheng Formation
gas-generating potential
gas-source correlation
exploration target
作者简介
第一作者:唐勇(1967-),男,重庆合川人,博士,中国石油新疆油田公司教授级高级工程师,主要从事地质综合研究与风险勘探工作。地址:新疆克拉玛依市,中国石油新疆油田公司,邮政编码:834000。E-mail:tyong@petrochina.com.cn;联系作者:胡素云(1963-),男,湖南邵阳人,博士,长江大学特聘教授,主要从事石油地质综合研究与非常规油气方面的研究工作。地址:北京市海淀区学院路20号,中国石油勘探开发研究院,邮政编码:100083。E-mail:husy@petrochina.com.cn。
