首页|准噶尔盆地中央坳陷西部下二叠统风城组天然气勘探潜力与重点领域

准噶尔盆地中央坳陷西部下二叠统风城组天然气勘探潜力与重点领域

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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20×108 m3/km2 的面积约6 500 km2;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.
Natural gas exploration potential and favorable targets of Permian Fengcheng Formation in the western Central Depression of Junggar Basin,NW China
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× 108 m3/km2 is approximately 6 500 km2.(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.

Junggar Basinwestern Central DepressionLower Permian Fengcheng Formationgas-generating potentialgas-source correlationexploration target

唐勇、胡素云、龚德瑜、尤新才、李卉、刘海磊、陈轩

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中国石油新疆油田公司,新疆克拉玛依 834000

长江大学,武汉 430100

中国石油勘探开发研究院,北京 100083

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

国家自然科学基金国家自然科学基金中国石油前瞻性基础性技术攻关项目中国石油前瞻性基础性技术攻关项目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

41802177422721882021DJ02062022DJ05072020D-5008-04

2024

10.11698/PED.20230631

石油勘探与开发
中国石油天然气股份有限公司勘探开发研究院 中国石油集团科学技术研究院

石油勘探与开发

CSTPCD北大核心
影响因子：4.977
ISSN：1000-0747
年,卷(期)：2024.51(3)
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