川东南习水地区下奥陶统层序地层特征及储层发育主控因素

doi:10.12108/yxyqc.20250414

岩性油气藏 ›› 2025, Vol. 37 ›› Issue (4): 147–158.doi: 10.12108/yxyqc.20250414

• 地质勘探 • 上一篇

川东南习水地区下奥陶统层序地层特征及储层发育主控因素

陈钰桦^1,2, 施泽进^1,2, 李文杰^1,2, 易永杰^1,2, 刘恒^1,2, 田亚铭^1,3, 谭谦^1,2

1. 成都理工大学油气藏地质及开发工程全国重点实验室, 成都 610059;
2. 成都理工大学能源学院（页岩气现代产业学院）, 成都 610059;
3. 成都理工大学地球与行星科学学院, 成都 610059

收稿日期:2025-02-10 修回日期:2025-03-28 发布日期:2025-07-05
第一作者:陈钰桦（2002-），女，成都理工大学在读硕士研究生，研究方向为沉积学与储层地质学。地址：（610059）四川省成都市成华区二仙桥东三路1号。Email：2549883641@qq.com。
通信作者: 施泽进（1965-），男，博士，教授，主要从事构造地质学与石油地质等研究。Email：szj@cdut.edu.cn。
基金资助:
国家自然科学基金面上项目“四川盆地东南部及周缘震旦系—寒武系微生物岩成岩作用与孔隙演化”（编号：41872137）、“基于深度学习地震多属性预测碳酸盐岩沉积相展布”（编号：42172175），四川省自然科学基金青年基金项目“华南早—中三叠世火山活动对四川盆地钾锂资源富集的影响”（编号：2023NSFSC0759）和国家自然科学基金青年基金项目“川中震旦系灯影组多期热液白云石化对白云岩储层的差异改造机制”（编号：42302187）联合资助。

Characteristics of sequence stratigraphy and main controlling factors for reservoir development of Lower Ordovician in Xishui area， southeastern Sichuan Basin

CHEN Yuhua^1,2, SHI Zejin^1,2, LI Wenjie^1,2, YI Yongjie^1,2, LIU Heng^1,2, TIAN Yaming^1,3, TAN Qian^1,2

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
2. College of Energy(College of Modern Shale Gas industry), Chengdu University of Technology, Chengdu 610059, China;
3. College of International Research Center for Planetary Science, Chengdu University of Technology, Chengdu 610059, China

Received:2025-02-10 Revised:2025-03-28 Published:2025-07-05

摘要/Abstract

摘要： 基于对野外露头和岩石薄片的观察，对川东南习水地区下奥陶统桐梓组—红花园组岩石微相类型进行了识别，以岩石微相组合确定了其沉积环境，揭示了沉积演化特征，并探讨了沉积环境和不同级次海平面变化对储层的控制作用。研究结果表明：①川东南习水地区下奥陶统桐梓组和红花园组发育13种岩石微相类型，可划分为潮坪、澙湖、浅滩、滩间海、台内洼地等5种沉积亚相。②研究区下奥陶统桐梓组—红花园组可划分为3个三级层序（自下而上为SQ1—SQ3），每个三级层序由1个退积型和3个进积型四级层序组成。SQ1时期由开阔台地逐渐转化为局限台地环境，发育浅滩—滩间海、澙湖—潮坪—浅滩、潮坪—浅滩3种沉积序列；SQ2时期为局限台地环境，发育澙湖—浅滩、澙湖—浅滩—潮坪2种沉积序列；SQ3时期为开阔台地环境，发育浅滩—台内洼地、台内洼地—浅滩、滩间海—浅滩3种沉积序列。③研究区下奥陶统局限台地浅滩和潮坪是储层发育的最有利沉积亚相，受不同级次海平面控制下的同生期—早成岩期溶蚀作用和白云石化作用影响，多套储层垂向叠置集中发育在SQ1高位体系域第2—3个和SQ2高位体系域第1—3个进积型四级层序内，尤其是局限台地浅滩与潮坪叠置的向上变浅的旋回中，储层规模较大，具有一定勘探潜力。

关键词: 岩石微相, 层序界面, 局限台地浅滩, 潮坪, 海平面变化, 桐梓组—红花园组, 奥陶系, 习水地区, 川东南

Abstract: Based on the observation of field outcrops and thin sections，the types of rock microfacies of Lower Ordovician Tongzi Formation and Honghuayuan Formation in Xishui area of southeastern Sichuan Basin were identified. The sedimentary environment was determined by rock microfacies assemblages，and the characteristics of sedimentary evolution were revealed. Controlling effects of sedimentary environment and different levels of sea-level changes on reservoirs were discussed. The results show that：（1）Thirteen rock microfacies types are developed in Lower Ordovician Tongzi Formation and Honghuayuan Formation in Xishui area of southeastern Sichuan Basin，which can be divided into five sedimentary subfacies： tidal flats，lagoons，shoals，intershoal seas， and intra-platform depressions.（2）There are three third-order sequences（SQ1-SQ3 from bottom to top）in Lower Ordovician Tongzi Formation and Honghuayuan Formation，each of which consists of one retrogradational and three progradational fourth-order sequences. During SQ1 period，the environment gradually changed from open platform to restricted platform，with three sedimentary sequences： shoals-intershoal seas，lagoonstidal flats-shoals，and tidal flats-shoals. During SQ2 period，it was restricted platform environment，with two sedimentary sequences： lagoons-shoals and lagoons-shoals-tidal flats. During SQ3 period，it was open platform environment，with three sedimentary sequences： shoals-intra-platform depressions，intra-platform depressionsshoals，and intershoal seas-shoals.（3）Shoals and tidal flats in the restricted platform of Lower Ordovician in the study area are the most favorable sedimentary subfacies for reservoir development. Influenced by the dissolution and dolomitization of syngenetic-early diagenetic stage under different levels of sea-level，multiple sets of reservoirs are vertically superimposed and concentratedly developed in the second to third progradational fourth-order sequences of SQ1 highstand systems tract and the first to third progradational fourth-order sequences of SQ2 highstand systems tract，especially in the upward-shallowing cycles where the shoals and tidal flats are superimposed in the restricted platform.The study areas can form large-scale reservoirs and has certain exploration potential.

Key words: rock microfacies, sequence boundary, restricted platform shoal, tidal flat, sea-level change, Tongzi-Honghuayuan Formations, Ordovician, Xishui area, southeastern Sichuan Basin

中图分类号:

TE121.3

陈钰桦, 施泽进, 李文杰, 易永杰, 刘恒, 田亚铭, 谭谦. 川东南习水地区下奥陶统层序地层特征及储层发育主控因素[J]. 岩性油气藏, 2025, 37(4): 147–158.

CHEN Yuhua, SHI Zejin, LI Wenjie, YI Yongjie, LIU Heng, TIAN Yaming, TAN Qian. Characteristics of sequence stratigraphy and main controlling factors for reservoir development of Lower Ordovician in Xishui area， southeastern Sichuan Basin[J]. Lithologic Reservoirs, 2025, 37(4): 147–158.

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川东南习水地区下奥陶统层序地层特征及储层发育主控因素

Characteristics of sequence stratigraphy and main controlling factors for reservoir development of Lower Ordovician in Xishui area， southeastern Sichuan Basin

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