古地理学报 ›› 2025, Vol. 27 ›› Issue (3): 714-730. doi: 10.7605/gdlxb.2025.02.007

• 古地理学及矿产资源 • 上一篇    下一篇

海相富有机质页岩储集层特征、成因类型和机制: 以川南长宁五峰组—龙马溪组为例*

廖崇杰1,2(), 陈雷1,2(), 古志斌3, 刘丙晓3, 杨莉4, 谭秀成1,2,5, 熊敏1,2, 曹剑6   

  1. 1 天然气地质四川省重点实验室,西南石油大学,四川成都 610500
    2 中国石油集团碳酸盐岩储层重点实验室西南石油大学研究分室,四川成都 610500
    3 四川长宁天然气开发有限责任公司,四川成都 610051
    4 四川页岩气勘探开发有限责任公司,四川成都 610051
    5 油气藏地质及开发工程全国重点实验室,西南石油大学,四川成都 610500
    6 南京大学地球科学与工程学院,江苏南京 210023
  • 收稿日期:2024-03-14 修回日期:2024-05-31 出版日期:2025-06-01 发布日期:2025-05-29
  • 通讯作者: 陈雷,男,1985年生,教授,主要从事非常规油气地质和层序地层学研究。E-mail: cl211@126.com。
  • 作者简介:

    廖崇杰,男,1998年生,博士研究生,主要从事非常规油气地质和沉积学的学习与研究。E-mail:

  • 基金资助:
    *国家自然科学基金项目(42372173)

Characteristics,genetic types and mechanisms of marine organic-rich shale reservoirs: a case study of the Wufeng-Longmaxi Formations in Changning area,southern Sichuan Basin

LIAO Chongjie1,2(), CHEN Lei1,2(), GU Zhibin3, LIU Bingxiao3, YANG Li4, TAN Xiucheng1,2,5, XIONG Min1,2, CAO Jian6   

  1. 1 Natural Gas Geology Key Laboratory of Sichuan Province,Southwest Petroleum University,Chengdu 610500,China
    2 Research Branch of Southwest Petroleum University,Key Laboratory of Carbonate Reservoirs,CNPC,Chengdu 610500,China
    3 Sichuan Changning Gas Development Co.,Ltd.,Chengdu 610051,China
    4 Sichuan Shale Gas Exploration and Development Co.,Ltd., Chengdu 610051,China
    5 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China
    6 School of Geosciences and Engineering,Nanjing University,Nanjing 210023,China
  • Received:2024-03-14 Revised:2024-05-31 Online:2025-06-01 Published:2025-05-29
  • Contact: CHEN Lei,born in 1985,is a professor at Southwest Petroleum University. He is mainly engaged in researches on unconventional petroleum geology and sequence stratigraphy. E-mail: cl211@126.com.
  • About author:

    LIAO Chongjie,born in 1998,a Ph.D. student,is mainly engaged in study and research on unconventional oil and gas geology and sedimentology. E-mail: .

  • Supported by:
    National Natural Science Foundation of China(42372173)

摘要:

以四川盆地南部长宁地区上奥陶统五峰组—下志留统龙马溪组为例,通过对各井的矿物组分、总有机碳(TOC)含量、孔隙度、含气性和沉积古地貌特征研究,对海相富有机质页岩的储集层成因机制进行分析。研究发现: (1)五峰组主要发育碳酸盐矿物和硅质矿物,页岩TOC含量、孔隙度和含气性均相对较低/较差; 龙马溪组龙一1亚段下部页岩以硅质矿物为主,TOC含量、孔隙度和含气性均表现最好; 龙一1亚段上部主要以黏土矿物为主,TOC含量、孔隙度和含气性均较低/较差。(2)将五峰组—龙马溪组海相页岩储集层划分为3个大类: 基质孔隙型储集层、黏土裂缝型储集层和有机孔型储集层,其中基质孔隙型储集层主要发育在五峰组,有机孔型储集层主要发育在龙一1亚段下部,龙一1亚段上部则以发育黏土裂缝型储集层为主,研究表明有机孔型储集层孔隙度高、含气性好,是最优质的海相页岩气储集层。 (3)依据残留厚度和补偿厚度印模法, 以下二叠统梁山组底界面为依据绘制出龙马溪组沉积前古地貌格局,通过对龙一1亚段下部储集层特征与古地貌格局对比, 表明古隆起控制优质烃源岩、斜坡区控制优质储集层, 古隆起与陆源输入联合控制脆性矿物分布。研究提供了一种新的海相富有机质页岩储集层勘探新思路,结果将有助于丰富中国南方海相页岩气富集理论。

关键词: 富有机质页岩, 储集层特征, 成因类型, 成因机制, 古地貌, 奥陶系, 四川盆地

Abstract:

This study investigates the genetic mechanisms of marine organic-rich shale reservoirs through an integrated analysis of mineral composition,total organic carbon(TOC),porosity,gas content,and sedimentary paleogeomorphology in the Upper Ordovician Wufeng Formation(O3w)to Lower Silurian Longmaxi Formation(S1l1)within the Changning area,southern Sichuan Basin. The results show that: (Ⅰ)Carbonate minerals and siliceous minerals are mainly developed in the O3w,and the TOC,porosity and gas content of the shale are relatively poor;The shale in the bottom of S1l 1 1 is dominated by siliceous minerals,and its TOC,porosity and gas content are the best. The upper S1l 1 1 is dominated by clay minerals,and its TOC,porosity and gas content are poor. (Ⅱ)Marine shale reservoirs of O3w and S1l 1 1 can be divided into three categories: matrix-porosity reservoirs(dominant in O3w,avg. porosity 3.1%),clay-fracture reservoirs(prevalent in lower S1l 1 1,avg. porosity 5.8%)and organic-porosity reservoirs(characteristic of upper S1l 1 1,avg. porosity 2.3%). Organic-porosity reservoirs represent the optimal marine shale gas reservoirs,characterized by high porosity and excellent gas-bearing capacity. (Ⅲ)The pre-depositional paleogeomorphic pattern of the Longmaxi Formation is drawn based on the bottom interface of the lower Permian Liangshan Formation by the residual thickness and compensation thickness impression method. The comparative study of reservoir characteristics and paleogeomorphic pattern in the bottom of S1l 1 1 proves that the paleouplift controls the high-quality source rocks,the slope area controls the high-quality reservoirs,and the distribution of brittle minerals is controlled jointly by the paleouplift and terrigenous input. Comprehensive analysis shows that the high quality shale gas reservoir mainly develops in the paleogeomorphic slope area. This systematic approach advances exploration strategies for marine shale reservoirs and enhances theoretical understanding of shale gas enrichment mechanisms in southern China.

Key words: organic-rich shale, reservoir characteristics, genetic types, genetic mechanism, palaeogeomorphology, Ordovician, Sichuan Basin

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