四川盆地西北部三叠系须三段砂砾岩沉积特征

doi:10.12108/yxyqc.20210403

岩性油气藏 ›› 2021, Vol. 33 ›› Issue (4): 20–28.doi: 10.12108/yxyqc.20210403

四川盆地西北部三叠系须三段砂砾岩沉积特征

张本健¹, 田云英¹, 曾琪¹, 尹宏¹, 丁熊²

1. 中国石油西南油气田公司川西北气矿, 四川江油 621700;
2. 西南石油大学地球科学与技术学院, 成都 610500

收稿日期:2020-08-09 修回日期:2020-09-10 出版日期:2021-08-01 发布日期:2021-08-06
第一作者:张本健(1980-),男,博士,高级工程师,主要从事地质勘探方面的研究工作。地址:(621700)四川省江油市太白东路1号川西北气矿。Email:zbjian@petrochina.com.cn
通信作者: 丁熊(1981-),男,博士,副教授,主要从事储层地质方面的研究工作。Email:xiongding@swpu.edu.cn。
基金资助:
中国石油西南油气田公司勘探综合研究项目“双鱼石地区须家河组沉积、储层特征研究”（编号：JS2020-09）资助

Sedimentary characteristics of sandy conglomerates of Triassic Xu-3 member in northwestern Sichuan Basin

ZHANG Benjian¹, TIAN Yunying¹, ZENG Qi¹, YIN Hong¹, DING Xiong²

1. Northwestern Sichuan Gas District, PetroChina Southwest Oil and Gas Field Company, Jiangyou 621700, Sichuan, China;
2. School of Geosciences and Technology, Southwest Petroleum University, Chengdu 610500, China

Received:2020-08-09 Revised:2020-09-10 Online:2021-08-01 Published:2021-08-06

摘要/Abstract

摘要： 近年来，四川盆地西北部三叠系须三段的天然气勘探持续获得新发现。为了系统研究四川盆地西北部三叠系须三段砂砾岩的沉积特征，开展了钻井岩心观察、测井解释、相标志鉴定和砂砾岩优势相分析。结果表明：①研究区须三段冲积扇扇中辫状河道、扇缘漫流沉积和扇三角洲平原辫状分流河道、扇三角洲前缘水下分流河道、河口坝和远砂坝等均发育砂砾岩沉积，其中辫状河道主要发育块状砾岩，砾多砂少，漫流沉积砂多砾少、发育板状交错层理和平行层理，具有向上变细的正粒序特征。②扇三角洲以砂岩沉积为主，辫状分流河道、水下分流河道、河口坝和远砂坝发育冲刷面、板状交错层理、平行层理和沙纹交错层理等为主，辫状分流河道、水下分流河道具有向上变细的正粒序特征，河口坝和远砂坝具有向上变粗的反粒序特征。③辫状河道、漫流沉积、辫状分流河道砂砾岩较发育，水下分流河道、河口坝和远砂坝砂砾岩次之。该研究成果对四川盆地西北部三叠系须三段的天然气勘探具有借鉴意义。

关键词: 沉积特征, 砂砾岩, 冲积扇, 扇三角洲, 须三段, 三叠系, 四川盆地西北部

Abstract: In recent years,there are new discoveries in natural gas exploration of the third member of Xujiahe Formation（Xu-3 member）of Triassic in northwest Sichuan Basin. In order to systematically study the sedimentary characteristics of sandy conglomerates of Triassic Xu-3 member in northwestern Sichuan Basin,drilling core observation,logging interpretation,facies identification and dominant facies analysis of sandy conglomerates were carried out. The results show that：（1）Sandy conglomerates were developed in braided channels and overflow deposition in alluvial fan and distributary channels,subaqueous distributary channels,mouth bars and distal bars in fan delta of Xu-3 member in the study area. The braided channel was mainly composed of massive conglomerate, with more conglomerates and less sandstone,and overflow deposition mainly developed tabular cross bedding and parallel bedding,with more sandstone and less conglomerates,showing positive grain order characteristics of upward thinning.（2）Fan deltas were dominated by sandstone,the braided distributary channels,subaqueous distributary channels,mouth bars and distal bars developed scour surface,tabular cross bedding,parallel bedding and sandy cross bedding. Braided distributary channels and subaqueous distributary channels have fining-upwards normal cycle as the dominate features. Mouth bars and distal bars have coarsening-upwards normal cycle as the dominate features.（3）Sandy conglomerates were mostly developed in the braided channels,overflow depo-sition and braided distributary channels,followed by subaqueous distributary channels,mouth bars and distal bars. The research results have reference significance for natural gas exploration of Triassic Xu-3 member in northwestern Sichuan Basin.

Key words: sedimentary characteristics, sandy conglomerates, alluvial fan, fan delta, Xu-3 member, Triassic, northwestern Sichuan Basin

中图分类号:

TE122.1

张本健, 田云英, 曾琪, 尹宏, 丁熊. 四川盆地西北部三叠系须三段砂砾岩沉积特征[J]. 岩性油气藏, 2021, 33(4): 20–28.

ZHANG Benjian, TIAN Yunying, ZENG Qi, YIN Hong, DING Xiong. Sedimentary characteristics of sandy conglomerates of Triassic Xu-3 member in northwestern Sichuan Basin[J]. Lithologic Reservoirs, 2021, 33(4): 20–28.

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四川盆地西北部三叠系须三段砂砾岩沉积特征

Sedimentary characteristics of sandy conglomerates of Triassic Xu-3 member in northwestern Sichuan Basin

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