岩性油气藏 ›› 2025, Vol. 37 ›› Issue (4): 73–83.doi: 10.12108/yxyqc.20250407

• 地质勘探 • 上一篇    

川西南二叠系栖霞组多期流体活动特征及成藏过程

闫伟涛1, 廖芸1, 黄文明2, 张本健3, 胡欣3, 李文正4, 吴娟1, 邓宾1   

  1. 1. 成都理工大学 能源学院, 成都 610059;
    2. 中国石油川庆钻探工程有限公司 苏里格项目经理部, 内蒙古 鄂尔多斯 071300;
    3. 中国石油西南油气田公司 勘探开发研究院, 成都 610041;
    4. 中国石油天然气股份有限公司 杭州地质研究院, 杭州 310023
  • 收稿日期:2025-02-17 修回日期:2025-03-24 发布日期:2025-07-05
  • 第一作者:闫伟涛(2001-),男,成都理工大学在读硕士研究生,研究方向为石油地质学。地址:(610051)四川省成都市成华区二仙桥东三路1号。Email:1321557177@qq.com。
  • 通信作者: 邓宾(1980-),男,教授,博士生导师,主要从事含油气盆地分析研究工作。Email:dengbin3000@163.com。
  • 基金资助:
    国家自然科学基金“海相深层油气富集机理与关键工程技术基础研究”(编号:U19B6003)和国家自然科学基金“青藏高原东缘若尔盖古高原形成与破坏过程及其动力学机制”(编号:42230310)联合资助。

Multi-phase fluid activities and hydrocarbon accumulation process of Permian Qixia Formation,southwestern Sichuan Basin

YAN Weitao1, LIAO Yun1, HUANG Wenming2, ZHANG Benjian3, HU Xin3, LI Wenzheng4, WU Juan1, DENG Bin1   

  1. 1. College of Energy, Chengdu University of Technology, Chengdu 610059, China;
    2. Sulige Project Management Department, Chuanqing Drilling Engineering Co., Ltd., CNPC, Ordos 071300, Inner Mongolia, China;
    3. Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China;
    4. PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023, China
  • Received:2025-02-17 Revised:2025-03-24 Published:2025-07-05

摘要: 通过岩心观察、薄片鉴定、阴极发光分析、流体包裹体测试及U-Pb定年技术等,对川西南地区中二叠统栖霞组岩石学特征、流体活动特征进行了分析,系统揭示了储层的矿物充填序列与油气成藏期次,明确了成藏模式。研究结果表明:①川西南二叠系栖霞组储层主要分布在栖二段,主要为溶蚀作用形成的缝洞型白云岩储层,其次为灰岩储层;储集空间以继承性溶蚀孔缝为主,多被方解石充填。②研究区栖霞组孔洞内发育3期矿物充填,从早至晚依次为:第1期细—中晶白云石(晚二叠世,253.0±12.0 Ma),以发育盐水包裹体为特征,反映晚二叠世构造抬升背景下的低温热液活动;第2期鞍形白云石(早三叠世,244.2±9.5 Ma),共生中—高成熟度蓝绿色荧光烃类包裹体与盐水包裹体,均一温度为110~115℃,指示印支运动初期热液-原油联合充注;第3期中晶方解石(晚侏罗世,158.0±38.0 Ma),伴生高成熟度蓝荧光油包裹体与高温盐水包裹体,均一温度为180~185℃,对应燕山期构造热事件驱动的深部原油二次运移。③研究区栖霞组油气藏为寒武系筇竹寺组与中二叠统2套烃源岩的混源供烃而成,成藏过程经历了2期关键充注,分别为早三叠世烃类初次充注形成古油藏和晚侏罗世深部原油再次充注使古油藏调整定型。

关键词: 缝洞储层, 白云岩, 矿物充填序列, 流体活动, 流体包裹体, 混源供烃, 古油藏, 栖霞组, 中二叠统, 四川盆地

Abstract: Based on core observation,thin section identification,cathodoluminescence analysis,fluid inclusion testing,and U-Pb dating technology,the characteristics of petrology and fluid activities of Middle Permian Qixia Formation in southwestern Sichuan Basin were analyzed.The mineral filling sequence and stages of hydrocarbon accumulation were systematically revealed,and the reservoir formation models were clarified.The results show that: (1)The reservoirs of Permian Qixia Formation in southwestern Sichuan Basin mainly distribute in the Qi-2 Member,mainly composed of fractured-vuggy dolomite reservoirs formed through dissolution modification,followed by limestone reservoirs. The reservoir space is predominantly composed of inherited dissolution pores and fractures,which are mostly filled with calcite(2)Qixia Formation reservoirs in the study area exhibit three stages of mineral filling within the pores and cavities,sequentially developed as follows: The first stage is fine-medium crystalline dolomite(Late Permian,253.0±12.0 Ma),characterized by the development of saline fluid inclusions,reflecting low-temperature hydrothermal activity during Late Permian tectonic uplift. The second stage is saddle shaped dolomite(Early Triassic,244.2±9.5 Ma),coexisting with medium to high maturity blue-green fluorescent hydrocarbon inclusions and saline fluid inclusions,with homogenization temperature of 110-115 ℃, indicating hydrothermal fluid and crude oil joint filling during the early stage of Indosinian movement. The third stage is medium-crystalline calcite(Late Jurassic,158.0±38.0 Ma),accompanied by high maturity blue fluorescent oil inclusions and high-temperature saline fluid inclusions,with homogenization temperature of 180-185 ℃,corresponding to the secondary migration of deep crude oil driven by Yanshanian tectonic thermal events. (3)Qixia Formation hydrocarbon reservoir in the study area are mixed-source supply of hydrocarbons formed by two sets of source rocks from Cambrian Qiongzhusi Formation and Middle Permian. The hydrocarbon accumulation process have experienced two key charging stages,namely the initial charging of hydrocarbons in Early Triassic to form the paleo-oil reservoir and the re-charging of deep crude oil in Late Jurassic to adjust and shape the paleo-oil reservoir.

Key words: fractured-vuggy reservoir, dolomite, mineral filling sequence, fluid activity, fluid inclusion, mixedsource hydrocarbon supply, paleo-oil reservoir, Qixia Formation, Middle Permian, Sichuan Basin

中图分类号: 

  • TE122.1
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