石油与天然气地质 ›› 2025, Vol. 46 ›› Issue (1): 151-166.doi: 10.11743/ogg20250111
王继远1,2(), 王斌1,2(
), 胡宗全3, 商丰凯4, 刘德志4, 李振明1,2, 邱岐1,2, 宋振响1,2, 胡志啟5
收稿日期:
2024-07-09
修回日期:
2024-11-10
出版日期:
2025-02-28
发布日期:
2025-03-03
通讯作者:
王斌
E-mail:wangjy1992.syky@sinopec.com;wangbin.syky@sinopec.com
第一作者简介:
王继远(1990—),男,博士研究生、工程师,油气储层表征与评价。E-mail: wangjy1992.syky@sinopec.com。
基金项目:
Jiyuan WANG1,2(), Bin WANG1,2(
), Zongquan HU3, Fengkai SHANG4, Dezhi LIU4, Zhenming LI1,2, Qi QIU1,2, Zhenxiang SONG1,2, Zhiqi HU5
Received:
2024-07-09
Revised:
2024-11-10
Online:
2025-02-28
Published:
2025-03-03
Contact:
Bin WANG
E-mail:wangjy1992.syky@sinopec.com;wangbin.syky@sinopec.com
摘要:
为了揭示准噶尔盆地腹部深层-超深层碎屑岩优质储层成因机理,利用盆地腹部地区最新钻井资料及岩心样品,通过铸体薄片、扫描电镜、能谱和包裹体分析以及XRD等测试方法,对二叠系上乌尔禾组和三叠系百口泉组与克拉玛依组储层成因进行研究。结果表明:成岩演化差异控制了原生孔隙和次生溶蚀孔隙的发育。克拉玛依组经历了压实、绿泥石包壳式胶结、长石/火山岩岩屑溶蚀、硅质胶结、自生伊利石沉淀以及晚期方解石胶结,其中绿泥石包壳是原生孔隙保存的最主要成岩矿物;上乌尔禾组经历了压实、绿泥石充填式胶结、浊沸石胶结、浊沸石/长石/火山岩岩屑溶蚀、硅质胶结、自生伊利石沉淀以及晚期方解石胶结,其中早期浊沸石胶结以及浊沸石、长石和火山岩岩屑酸性溶蚀是次生孔隙发育的关键成岩作用。受浅水辫状河三角洲前缘水下分流河道高能相带强水动力淘洗,储层原始孔隙结构优越,与早成岩期的绿泥石包壳及强超压共同控制原生孔隙的保存。中-基性火山岩岩屑水化蚀变成因的高硬度浊沸石早期胶结,抵抗了快速深埋阶段的压实减孔。多期生烃酸性流体伴随超压传递促进硅铝酸盐矿物溶蚀增孔。低地温背景下,上乌尔禾组-百口泉组仍处于中成岩A-B期,减缓了成岩演化进程,有效孔隙发育的下限深度增加。
中图分类号:
图3
准噶尔盆地腹部二叠系-三叠系砂岩铸体薄片显微镜下特征照片a. 董17井,埋深6 116.0 m,T3b,火山岩岩屑大量发育,绿泥石化普遍,局部见石英次生加大,单偏光; b. 成6井,埋深5 452.0 m,T2k,浑圆状石英,发育次生加大边,见方解石交代岩屑,单偏光;c.成6井,埋深5 452.0 m,T2k,方解石交代长石,正交光;d. 成6井,埋深5 452.0 m,T2k,高岭石充填,单偏光;e. 征10井,埋深6 580.0 m,T2k,粗面岩岩屑和变质石英岩岩屑局部粒间方解石胶结,正交光;f. 征10井,埋深7 059.5 m,T1b,粗面岩等中性火山岩岩屑发育,粒间浊沸石胶结,单偏光;g. 董17井,埋深6 585.4 m,T1b,中-基性火山岩岩屑发育,局部硅质胶结,弱胶结处火山岩岩屑颗粒之间呈凹凸接触,单偏光;h. 董17井,埋深7 149.0 m,P3w,粒间方解石胶结,阴极发光;i. 沙15井,埋深6 196.0 m,P3w,火山岩岩屑发育,颗粒间方解石和浊沸石胶结,单偏光,茜素红染色"
图6
准噶尔盆地腹部二叠系-三叠系碎屑岩储集空间镜下特征照片a. 征10井,埋深6 710.0 m,T2k,原生粒间孔,蓝色铸体,单偏光;b.征10井,埋深6 772.5 m,T2k,原生粒间孔,孔内见少量石英雏晶,蓝色铸体,单偏光;c. 董17井,埋深6 585.4 m,T1b,原生粒间孔,孔内局部充填石英、绿泥石和钠长石微晶,扫描电镜;d. 征10井,埋深6 961.0 m,T1b,浊沸石溶蚀孔,孔内见沥青质残留,蓝色铸体,单偏光;e. 沙15井,埋深6 294.0 m,P3w,长石溶蚀孔,蓝色铸体,单偏光; f. 董17井,埋深6 788.5 m,P3w,火山岩屑和浊沸石溶蚀孔,蓝色铸体,单偏光; g. 成6井,埋深5 452.0 m,高岭石晶间孔与长石溶蚀伴生,T2k,蓝色铸体,单偏光; h. 董17井,埋深6 595.0 m,T1b,绿泥石晶间孔,扫描电镜; i. 董16井,埋深6 893.0 m,P3w,伊利石晶间孔,扫描电镜; j. 董17井,埋深6 734.0 m,T1b,浊沸石晶间孔和溶蚀孔,扫描电镜; k. 董17井,埋深7 149.0 m,P3w,粒缘缝和破裂缝,扫描电镜; l. 董17井,埋深7 137.4 m,P3w,网状缝,裂缝内部方解石和泥质、铁质充填,蓝色铸体,单偏光"
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全文 102
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摘要 65
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