准噶尔盆地阜康凹陷中—上二叠统砂砾岩中自生沸石成因及对储层发育的影响  

Origin of authigenic zeolite and its influence on reservoir development in glutenites of the Middle-Upper Permian in Fukang Sag,Junggar Basin

作　　者：刘超威 吕正祥[2,3] 陈梦娜 李宗浩[1] 卿元华 张蓉[1] 杨和山[1] 黄志强[1] 王泽胜[1] 樊向东[1] LIU Chaowei;LÜZhengxiang;CHEN Mengna;LI Zonghao;QING Yuanhua;ZHANG Rong;YANG Heshan;HUANG Zhiqiang;WANG Zesheng;FAN Xiangdong(Research Institute of Exploration and Development,Petro China Xinjiang Oilfield Companry,Karamay 834000,China;College of Energy Resources,Chengdu University of Technology,Chengdu 610059,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;School of History and Geography,Chengdu Normal University,Chengdu 611130,China)

机构地区：[1]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000 [2]成都理工大学能源学院,四川成都610059 [3]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [4]成都师范学院史地与旅游学院,四川成都611130

出　　处：《沉积与特提斯地质》2024年第4期826-839,共14页Sedimentary Geology and Tethyan Geology

基　　金：中国石油股份公司前瞻性基础性技术攻关项目“地层不整合油气藏成藏主控因素与关键要素定量评价技术研究”(2021DJ0405);“准噶尔盆地全油气系统地质理论与勘探实践”(2022DJ0108)。

摘　　要：针对准噶尔盆地阜康凹陷中—上二叠统砂砾岩中沸石成因及主要储集空间类型认识不清的问题,利用显微薄片、扫描电镜、能谱分析、X射线衍射等资料,分析了自生沸石的产出特征、成因以及对储层发育的影响。研究表明:(1)自生沸石以浊沸石为主,少量方沸石,主要呈连晶状和充填粒间孔隙的形式产出。(2)早期连晶状浊沸石、方沸石主要形成于早成岩A期;中期充填粒间孔隙的浊沸石、方沸石主要形成于早成岩B期;晚期交代状浊沸石主要形成于中成岩A晚期—B期。(3)早期沸石物质主要来源于斜长石、岩浆岩岩屑水化、水解和碳酸的溶解,主要为斜长石水化及斜长石钠长石化产物;中—晚期沸石的物质来自与干酪根热演化有关的有机酸、碳酸对斜长石、岩浆岩岩屑的溶解,主要为斜长石的钠长石化、富Ca^(2+)环境中方沸石转化的产物。(4)砂砾岩呈现出“沸石强烈溶蚀—方解石不溶蚀(或弱溶蚀)”的特征,粒间浊沸石溶孔是最重要的储集空间类型;浊沸石整体溶蚀强烈,显著改善了储层物性,是砂砾岩成储的关键控制因素。The origin of authigenic zeolites and the main reservoir space types in glutenite reservoirs of the Middle-Upper Permian in the Fukang Sag,Junggar Basin,remain unclear.This study utilizes methods such as optical microscope,scanning electron microscope(SEM),energy spectrum analysis,and X-ray diffraction(XRD)analysis to investigate occurrence characteristics,as well as the origin and its influence of authigenic zeolites on reservoir development in the glutenite reservoirs.The results are as follows:(1)Laumontites are identified as the predominant authigenic zeolites,with minor occurrences of analcimes in poikilitic and interparticle-pore filling forms.(2)Early-stage poikilitic laumontites and analcimes formed during phase A of eodiagenesis,while middle-stage interparticle-pore filling laumontites and analcime formed during phase B of eodiagenesis.Late-stage replacive laumontites formed during late phase A and phase B of mesodiagenesis.(3)The materials for early-stage zeolites originated from the hydration-hydrolysis of plagioclase and magmatic rock fragments,and the dissolution of CO_(2)from biological degradation,which formed through the hydration and albitization of plagioclase.Middle-late stage laumonites,related to the dissolution of plagioclase and magmatic rock fragments by organic acids and CO_(2)due to thermal evolution of kerogen,formed through plagioclase albitization and analcime alteration in Ca^(2+)-rich solutions.(4)The glutenite is characterized by“intense dissolution of zeolite and no(or weak)dissolution of calcite”,with the intergranular laumontite dissolution pores being the most important type of reservoir space.The intense dissolution of laumontites significantly enhances reservoir quality and is a key controlling factor in the formation of glutenite reservoirs.

关 键 词：阜康凹陷 中—上二叠统 砂砾岩 自生沸石 成因 溶蚀孔隙 

分 类 号：P571[天文地球—矿物学]