二叠系火山碎屑岩气藏天然气地球化学特征及气源分析——以四川盆地成都—简阳地区永探1井为例

doi:10.13278/j.cnki.jjuese.20190246

摘要/Abstract

摘要： 2018年12月底，在四川盆地二叠系火山岩发育地区部署的风险探井永探1井测试获得22.5万m³/d的高产工业气流，实现了二叠系火山碎屑岩的重大勘探突破，展现了火山碎屑岩气藏的巨大勘探潜力。本文根据该钻井成果资料，应用分析化验数据，采用不同地区气-气对比方法，开展了成都—简阳地区天然气地球化学特征分析、源-储接触关系解剖及气源综合对比。在此基础上，对二叠系火山碎屑岩气藏天然气成因进行了鉴别，对天然气来源进行了判识。结果表明：永探1井火山岩气藏天然气均为典型的干气，干燥系数达0.997，CH₄质量分数高，平均为99.03%，C₂H₆质量分数低，平均为0.35%，C₃H₈几乎没有，不含H₂S；天然气甲烷、乙烷碳同位素值均较轻，甲烷碳同位素平均值为-32.17‰，乙烷碳同位素平均值为-34.27‰，且岩心及镜下可见大量残余沥青，天然气成因鉴别分析表明永探1井火山岩气藏天然气为原油二次裂解气；通过源-储接触关系解剖以及天然气甲烷、乙烷碳同位素对比分析，表明永探1井火山碎屑岩气藏天然气主要来源于德阳—安岳台内裂陷内发育的巨厚下寒武统筇竹寺组优质烃源岩，部分来源于中二叠统。

关键词: 四川盆地, 二叠系, 永探1井, 火山碎屑岩, 天然气, 地球化学, 气源

Abstract: At the end of December 2018, a high-yield gas-flow of 22.5×10⁴m³/d was discovered by the risk exploration well of Permian volcanic rock-Well YT1 deployed by PetroChina southwest oil & gas field company, which made a breakthrough in the exploration of volcanic rocks in Sichuan basin and broadened a great exploration potential of pyroclastic gas reservoir. According to the latest drilling results,the latest analysis,and test data, the gas-gas correlation method in different areas was adopted. The analysis of the geochemical characteristics of natural gas, the anatomy of the source reservoir contact relationship and the comprehensive comparison of gas sources in this area were carried out,and the origin of natural gas in the Permian volcanic gas reservoir and the gas source were determined. The results show that the natural gas of Well YT1 in the volcanic gas reservoir is typically dry gas, with a drying coefficient of 0.997, the content of CH₄ is high with an average of 99.03%, the content of C₂H₆ is low with an average of 0.35%, C₃H₈ is almost absent and the content of H₂S is zero; the carbon isotope values of methane and ethane are relatively light with the average carbon isotopic values of-32.17‰ and -34.27‰ respectively,and a large amount of reservoir bitumen can be seen in the core and under the microscope. The genetic identification analysis shows that the natural gas of Well YT1 in the volcanic gas reservoir is the secondary cracked gas of crude oil. Based on the source reservoir contact relationship and the comparison of methane and ethane carbon isotopes of natural gas, the natural gas of Well YT1 in the volcanic gas reservoir is mainly from the thick, high-quality,and effective source rocks of the Lower Cambrian Qiongzhusi Formation, which developed in the internal rift valley of the Deyang-Anyue platform and partially from the Middle Permian.

Key words: Sichuan basin, Permian, Well YT1, pyroclastic rocks, natural gas, geochemistry, gas source

中图分类号:

P618.13

田兴旺, 罗冰, 孙奕婷, 刘冉, 李亚, 陈延贵, 周春林, 汪华, 李亚丁, 王尉, 王云龙, 杨岱林. 二叠系火山碎屑岩气藏天然气地球化学特征及气源分析——以四川盆地成都—简阳地区永探1井为例[J]. 吉林大学学报(地球科学版), 2021, 51(2): 325-335.

Tian Xingwang, Luo Bing, Sun Yiting, Liu Ran, Li Ya, Chen Yangui, Zhou Chunlin, Wang Hua, Li Yading, Wang Wei, Wang Yunlong, Yang Dailin. Natural Gas Characteristics and Source Analysis of Permian Volcanic Gas Reservoir: A Case Study of Well YT1 in Chengdu-Jianyang Area, Sichuan Basin[J]. Journal of Jilin University(Earth Science Edition), 2021, 51(2): 325-335.

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