四川盆地北部二叠系茅口组沉积特征及油气意义

doi:10.11885/j.issn.1674-5086.2020.12.24.04

西南石油大学学报(自然科学版) ›› 2023, Vol. 45 ›› Issue (1): 1-12.DOI: 10.11885/j.issn.1674-5086.2020.12.24.04

• 地质勘探 • 下一篇

四川盆地北部二叠系茅口组沉积特征及油气意义

曾德铭^1,2, 谢晓斌^1,2, 黄董^1,2, 余良志³, 张宇³

1. 油气藏地质及开发工程国家重点实验室·西南石油大学, 四川成都 610500;
2. 西南石油大学地球科学与技术学院, 四川成都 610500;
3. 中国石油西南油气田分公司勘探事业部, 四川成都 610051

收稿日期:2020-12-24 发布日期:2023-02-24
通讯作者: 曾德铭,E-mail:8203763@qq.com
作者简介:曾德铭,1978年生,男,汉族,湖南新宁人,副教授,博士,主要从事基础地质、沉积及储层等方面的教学和科研工作。E-mail:8203763@qq.com
谢晓斌,1993年生,男,汉族,青海西宁人,硕士研究生,主要从事碳酸盐岩沉积相方面的研究工作。E-mail:877108828@qq.com
黄董,1997年生,男,汉族,四川成都人,硕士研究生,主要从事碳酸盐岩沉积相方面的研究工作。E-mail:990871273@qq.com
余良志,1989年生,男,汉族,重庆云阳人,高级工程师,主要从事探井部署及地质跟踪方面的研究。E-mail:yulzhi@petrochina.com.cn
张宇,1990年生,男,汉族,重庆江津人,工程师,主要从事探井地质技术管理工作。E-mail:zhangyu06@petrochina.com.cn
基金资助:
国家科技重大专项（2016ZX05007004--001）

Sedimentary Characteristics of the Maokou Formation of the Permian in Northern Sichuan Basin and Its Petroleum Significance

ZENG Deming^1,2, XIE Xiaobin^1,2, HUANG Dong^1,2, YU Liangzhi³, ZHANG Yu³

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
2. School of Geosciences and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
3. Exploration Division, Southwest Oil & Gas Field Company, PetroChina, Chengdu, Sichuan 610051, China

Received:2020-12-24 Published:2023-02-24

摘要/Abstract

摘要： 基于地震资料精细解释成果，结合野外剖面及室内薄片观察，通过分析主要岩石类型及古生物、地球化学和地震相特征，对四川盆地北部二叠系茅口组沉积相展布特征进行研究，依据生物（屑）灰岩、礁灰岩和硅质岩等岩相发育规律以及地震地层结构和地层厚度变化特征，认为茅口组发育了开阔台地、台地边缘及斜坡—盆地等沉积亚相，总结出了开阔海夹点礁、开阔海夹点滩、台地边缘滩和灰质—硅质盆地等4种沉积微相组合，明确了沉积相纵向演化和平面展布规律。结果表明，台地边缘高能生物滩平面上呈条带状在剑阁—元坝—龙岗一带规模发育，生物（屑）灰岩的晶间溶孔、粒间溶孔和生物体腔孔发育，物性好，是优质储集层发育带；川西海槽和广元—旺苍海槽茅四段的硅质岩和泥岩有机碳含量高，则是优质生油岩，优越的沉积环境为该区油气成藏提供了有利的生油和储集条件。

关键词: 岩石类型, 沉积特征, 台地边缘, 茅口组, 四川盆地北部

Abstract: Based on the fine seismic data interpretation result, combining the field sections and indoor thin-section observation, we study the depositional facies distribution characteristics, by analyzing the main rock types, paleontology, geochemical and seismic characteristics. On the basis of biological (chip) limestone, siliceous rocks and reef limestone development rule of the lithofacies and seismic stratigraphic structures and stratigraphic thickness variation characteristics, we find out that Maokou Formation has developed sedimentary facies of the open sea platform, marginal-platform shoals and slope-basin, summarize four kinds of sedimentary facies association, open sea platform with patch reefs, open sea platform with shaoal patch, the marginal-platform shoals and calcareous-siliceous basins. Land clarify the vertical evolution of sedimentary facies and plane distribution rule. The results show that the high-energy marginal-platform shoals present banding development in the Jiange——Yuanba——Longgang Area. The biological (chip) limestone develops the intercrystalline denudation pore, intergranular dissolved pore and biogenic body cavity pore, which is a high quality reservoir development zone with good physical properties. Maokou Formation (Member 4) in the western Sichuan trough and Guangyuan——Wangcang trough area sedimentary siliceous rock and mudstone is the high quality source rocks, the excellent sedimentary environment providing a favorable conditions for hydrocarbon accumulation oil source and reservoir.

Key words: rock types, sedimentary characteristics, the marginal-platform shoals, Maokou Formation, northern Sichuan Basin

中图分类号:

TE122

曾德铭, 谢晓斌, 黄董, 余良志, 张宇. 四川盆地北部二叠系茅口组沉积特征及油气意义[J]. 西南石油大学学报(自然科学版), 2023, 45(1): 1-12.

ZENG Deming, XIE Xiaobin, HUANG Dong, YU Liangzhi, ZHANG Yu. Sedimentary Characteristics of the Maokou Formation of the Permian in Northern Sichuan Basin and Its Petroleum Significance[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(1): 1-12.

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四川盆地北部二叠系茅口组沉积特征及油气意义

Sedimentary Characteristics of the Maokou Formation of the Permian in Northern Sichuan Basin and Its Petroleum Significance

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