川东地区寒武系高台组油气成藏期次与油气潜力新认知  

New Understanding of Hydrocarbon Potential and Hydrocarbon Accumulation Stages of Reservoirs of Cambrian Gaotai Formation in Eastern Sichuan Basin

作　　者：王纪煊 李世临 胡忠贵[1,2] 胡九珍[1,2] 黄宇飞 方少林 王飞扬 张若怡 WANG Ji-xuan;LI Shi-lin;HU Zhong-gui;HU Jiu-zhen;HUANG Yu-fei;FANG Shao-lin;WANG Fei-yang;ZHANG Ruo-yi(School of Geosciences,Yangtze University,Wuhan 430100,China;Sedimentary Basin Research Center Yangtze University,Wuhan 430100,China;Chongqing Gas Mine,PetroChina Southwest Oil and Gas Field Company,Chongqing 402160,China;Dongxin Oil Production Plant,Sinopec Shengli Oilfield Company,Dongying 257094,China)

机构地区：[1]长江大学地球科学学院,武汉430100 [2]长江大学沉积盆地研究中心,武汉430100 [3]中国石油西南油气田公司重庆气矿,重庆402160 [4]中国石化胜利油田分公司东辛采油厂,东营257094

出　　处：《科学技术与工程》2024年第21期8869-8878,共10页Science Technology and Engineering

基　　金：“十三五”国家科技重大专项(2016ZX05007002)。

摘　　要：四川盆地东部(川东)地区寒武系油气资源丰富,但近年来高台组钻井勘探并未取得较大进展。为分析寒武系高台组流体包裹体特征,明确川东地区高台组油气运移史和下古生界天然气勘探潜力,通过采取镜下观察,结合流体包裹体均一温度-埋藏史间接投影定年法,对研究区进行储层流体包裹体特征分析的方法研究了油气成藏时期与油气潜力。结果表明:寒武系高台组流体包裹体宿主矿物为裂缝充填方解石和溶孔充填方解石,包裹体均一温度分布范围为117.8~205.1℃;充注期次主要包括生烃初期充注期、生油高峰充注期和原油裂解充注期,形成了先低后高的三期“幕式”油气充注模式;三期流体活动分别对应晚二叠世—早三叠世、中三叠世—早侏罗世和中侏罗世。综合构造等条件分析认为,川东地区寒武系高台组天然气有利于向盐间白云岩储层运聚成藏,将是该区下一步的勘探方向。The eastern Sichuan Basin is rich in Cambrian oil and gas resources,but the drilling exploration of Gaotai Formation has not made great progress in recent years.By analyzing the fluid inclusion characteristics of the Cambrian Gaotai Formation,it is of great significance to identify the hydrocarbon accumulation of the Gaotai Formation and the Lower Paleozoic gas exploration potential in the eastern Sichuan Basin.The characteristics of fluid inclusions in the study area were analyzed by means of microscope observation combined with the indirect projection dating method of fluid inclusions homogenization temperature-burial history to further determine the hydrocarbon accumulation period.The results show that the host minerals of fluid inclusions in the Cambrian Gaotai Formation are fissure filled calcite and dissolved pore filled calcite,and the homogenization temperature of inclusions ranges from 117.8℃to 205.1℃.The charging periods mainly include the initial hydrocarbon generation charging period,the peak oil generation charging period and the crude oil cracking charging period,forming three“episodic”oil and gas charging modes,first low and then high.The three phases of fluid activity correspond to the Late Permian-Early Triassic,Middle Triassic-Early Jurassic and Middle Jurassic respectively.Comprehensive analysis of structural conditions shows that the gas bearing capacity of the Cambrian Gaotai Formation in the eastern Sichuan area is poor,but it is conducive to the migration and accumulation of natural gas in the upper middle and shallow strata,which may be the next exploration direction in this area.

关 键 词：川东地区 高台组 包裹体 均一温度 油气成藏 

分 类 号：P618.13[天文地球—矿床学]