岩性油气藏 ›› 2022, Vol. 34 ›› Issue (5): 139–151.doi: 10.12108/yxyqc.20220512

• 地质勘探 • 上一篇    下一篇

川中地区中三叠统雷口坡组三段源储特征及配置关系

阮蕴博1,2, 周刚3, 霍飞1,2, 孙豪飞3, 郭佩1,2, 罗涛1, 蒋华川1,2, 文华国1,2   

  1. 1. 成都理工大学 油气藏地质及开发工程国家重点实验室, 成都 610059;
    2. 成都理工大学 沉积地质研究院, 成都 610059;
    3. 中国石油西南油气田分公司 勘探开发研究院, 成都 610041
  • 收稿日期:2021-11-17 修回日期:2022-03-10 出版日期:2022-09-01 发布日期:2022-09-06
  • 通讯作者: 文华国(1979-),男,博士,教授,主要从事碳酸盐岩沉积学方面的科研和教学工作。Email:wenhuaguo08@cdut.edu.cn。 E-mail:wenhuaguo08@cdut.edu.cn。
  • 作者简介:阮蕴博(1998-),男,成都理工大学在读硕士研究生,研究方向为海相碳酸盐岩沉积学。地址:(610059)四川省成都市成华区二仙桥东三路1号成都理工大学。Email:1025850858@qq.com
  • 基金资助:
    四川省青年科技创新研究团队项目“天然气成藏物质基础”（编号：22CXTD0064）资助

Source-reservoir characteristics and configuration of the third member of Middle Triassic Leikoupo Formation in central Sichuan Basin

RUAN Yunbo1,2, ZHOU Gang3, HUO Fei1,2, SUN Haofei3, GUO Pei1,2, LUO Tao1, JIANG Huachuan1,2, WEN Huaguo1,2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
    2. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China;
    3. Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China
  • Received:2021-11-17 Revised:2022-03-10 Online:2022-09-01 Published:2022-09-06

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摘要： 通过岩心观察和薄片鉴定等资料，结合岩石物性、X射线衍射、总有机碳（TOC）含量及岩石热解和干酪根碳同位素等分析结果，对川中地区中三叠统雷口坡组三段（雷三段）的烃源岩和储层特征以及二者的配置关系进行了研究。研究结果表明：①川中地区雷三段2亚段发育一套以页岩和泥质灰岩为主的烃源岩，厚度为20～100 m，页岩平均TOC值为1.08%，最高可达4.01%，泥质灰岩平均TOC值为0.40%，有机质类型以Ⅱ1型为主，Ⅰ型次之，处于高成熟—过成熟早期阶段，生烃潜力较好。②研究区雷三段3亚段发育一套以粉晶白云岩和砂屑白云岩为主的储层，储集空间主要为晶间（溶）孔和粒间溶孔，平均孔隙度为4.05%，平均渗透率为1.1 mD，具有低孔中渗的特征。③雷三段2亚段烃源岩与3亚段储层形成了良好的源储配置关系，可形成“下生上储”、“自生自储”型油气藏，裂缝系统既为油气运移通道，也是重要的储集空间，上覆雷四段膏盐岩和须家河组一段泥岩均为有效盖层。

关键词: 烃源岩, 白云岩, 源储配置, 下生上储, 自生自储, 雷口坡组三段, 中三叠统, 川中地区

Abstract: Based on the data of core observation and thin section identification,combined with the analysis results of rock physical properties,X-ray diffraction,total organic carbon(TOC)content,rock pyrolysis and kerogen carbon isotope,the characteristics of source rocks and reservoirs of the third member of Middle Triassic Leikoupo Formation(T2 l3)in the Central Sichuan Basin and their configuration relationship were systematically studied. The results show that:(1)There is a set of hydrocarbon source rocks mainly composed of shale and marl developed in the second sub-member of T2l3(T2l32)in Central Sichuan Basin,with a thickness of 20-100 m. The average TOC value of shale is 1.08%,up to 4.01%,and the average TOC value of marl is 0.40%. The organic matters are mainly type Ⅱ1,followed by type Ⅰ,which are in the early stage of high maturity to over maturity,and have good hydrocarbon generation potential.(2)A set of reservoir mainly composed of silty dolomite and sandy dolomite is developed in the third sub-member of T2 l3(T2 l33). The reservoir space is mainly composed of intercrystalline(dissolved)pores and intergranular dissolved pores,with an average porosity of 4.05% and an average permeability of 1.1 mD. It has the characteristics of low porosity and medium permeability.(3)The source rocks of T2 l32 have a good source-reservoir configuration relationship with the reservoirs of T2 l33,which can form the hydrocarbon accumulation model of "lower generation and upper accumulation" and "self-generation and self-accumulation". The fracture system is not only an oil and gas migration channel,but also an important reservoir space. The overlying gypsum salt rocks of the fourth member of Leikoupo Formation and the mudstone of the first member of Xujiahe Formation are effective caprocks.

Key words: hydrocarbon source rocks, dolomite, source-reservoir configuration, lower generation and upper accumulation, self-generation and self-accumulation, the third member of Leikoupo Formation, Middle Triassic, central Sichuan Basin

中图分类号: 

  • TE122.1
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