沙湾凹陷砂砾岩沸石胶结物与碎屑颗粒粘结差异成因分析

doi:10.7657/XJPG20240204

摘要/Abstract

摘要：

通过岩石薄片、扫描电镜、能谱分析等微观实验，对准噶尔盆地沙湾凹陷二叠系砂砾岩储集层中沸石胶结物类型及特征进行了分析，明确了沸石胶结物与碎屑颗粒粘结差异的机理。结果表明：上二叠统上乌尔禾组储集层中，塑性岩屑变形及偏碱性地层水使得浊沸石与碎屑颗粒的粘结性较强；下二叠统风城组储集层浊沸石在异常高压、酸性流体等条件下，与碎屑颗粒粘结程度低，而片沸石由于其晶体特征，与碎屑颗粒的粘结程度较高；上乌尔禾组和风城组储集层中沸石胶结物与碎屑颗粒粘结差异主要与岩石成分、异常压力、矿物类型、晶体结构及后期成岩流体改造程度有关。

关键词: 沙湾凹陷, 二叠系, 上乌尔禾组, 风城组, 沸石胶结物, 碎屑颗粒, 粘结差异, 成因分析

Abstract:

Through thin section and scanning electron microscopy （SEM） observations and energy spectrum analysis, the types and characteristics of zeolite cements in the Permian sandy conglomerate reservoirs in the Shawan sag of Junggar basin were identified, and the mechanism of differential bonding between zeolite cements and clastic particles was clarified. The results show that in the Upper Permian upper Wuerhe reservoirs, the plastic deformation of rock fragments and alkaline formation water result in strong bonding between laumontites and clastic particles and in the Lower Permian Fengcheng reservoirs, laumontites are lowly bonded with clastic particles under the conditions of abnormally high pressure, and acidic fluids, while heulandites are highly bonded with clastic particles due to their crystal characteristics. The differential bonding between zeolite cements and clastic particles in the upper Wuerhe and Fengcheng reservoirs are mainly related to rock composition, abnormal pressure, mineral type, crystal structure, and the degree of late diagenetic fluid alteration.

Key words: Shawan sag, Permian, upper Wuerhe formation, Fengcheng formation, zeolite cement, clastic particle, differential bonding, genesis analysis

中图分类号:

TE122

况昊, 周元东, 刘豪, 潘浪, 周润驰, 王钧民, 谭先锋. 沙湾凹陷砂砾岩沸石胶结物与碎屑颗粒粘结差异成因分析[J]. 新疆石油地质, 2024, 45(2): 163-171.

KUANG Hao, ZHOU Yuandong, LIU Hao, PAN Lang, ZHOU Runchi, WANG Junmin, TAN Xianfeng. Genesis of Differential Bonding Between Zeolite Cements and Clastic Particles in Sandy Conglomerates in Shawan Sag，Junggar Basin[J]. Xinjiang Petroleum Geology, 2024, 45(2): 163-171.

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井名	井段/m	压力系数
SP3井	4 635.00—4 900.00	1.40~1.50
SP4井	4 332.00—4 600.00	1.40~1.50
SP5井	4 690.00—4 772.00	1.30~1.45
CP24井	4 538.00—4 935.65	1.30~1.40
SP7井	5 386.00—5 416.00	1.40~1.55

井名	层位	沸石类型	成分类型	压力系数	溶蚀类型及强度	粘结强弱程度
SP4井	风城组	片沸石	凝灰岩、安山岩	1.40~1.50	不稳定物质部分溶蚀，片沸石难溶	紧密粘结
SP5井	风城组	片沸石	凝灰岩、安山岩、霏细岩	1.40~1.50	不稳定物质部分溶蚀，片沸石难溶	紧密粘结
SP2井	上乌尔禾组	浊沸石	凝灰岩	1.80~1.90	不稳定物质及浊沸石部分溶蚀	中等紧密粘结
SP3井	风城组	浊沸石、片沸石	凝灰岩、安山岩	1.50~1.60	不稳定物质及浊沸石部分溶蚀，片沸石难溶	中等紧密粘结
ST001井	上乌尔禾组	浊沸石	凝灰岩	1.70~1.80	不稳定物质及浊沸石溶蚀明显	松散粘结
ST2井	风城组	浊沸石	凝灰岩、安山岩	1.40~1.50	不稳定物质及浊沸石溶蚀明显	松散粘结
CP24井	风城组	浊沸石、片沸石	凝灰岩、安山岩	1.20~1.30	不稳定物质及浊沸石溶蚀明显，片沸石难溶	松散粘结