乍得南部Bongor盆地下白垩统碎屑岩储层成岩作用及其对物性的影响

doi:10.13278/j.cnki.jjuese.20200134

吉林大学学报(地球科学版) ›› 2021, Vol. 51 ›› Issue (6): 1689-1699.doi: 10.13278/j.cnki.jjuese.20200134

乍得南部Bongor盆地下白垩统碎屑岩储层成岩作用及其对物性的影响

陶永富¹, 李达¹, 黄长兵², 廖鸿辉¹, 张华琴¹, 寻升¹, 李翀¹, 吴伟³

1. 中国石油玉门油田分公司勘探开发研究院, 甘肃酒泉 735000;
2. 西南科技大学环境与资源学院, 四川绵阳 621000;
3. 中国石油集团测井有限公司地质研究院, 西安 710000

收稿日期:2020-06-03 出版日期:2021-11-26 发布日期:2021-11-24
通讯作者: 黄长兵(1986-),男,高级工程师,博士,主要从事石油地质相关方向的研究,E-mail:182384895@qq.com E-mail:182384895@qq.com
作者简介:陶永富(1989-),男,工程师,主要从事油藏工程方面的研究,E-mail:ymtaoyf@petrochina.com.cn
基金资助:
中国石油天然气股份有限公司科技专项（2018D-0704）

Diagenesis of Lower Cretaceous Clastic Reservoir and Its Influence on Physical Properties in Bongor Basin, Southern Chad

Tao Yongfu¹, Li Da¹, Huang Changbing², Liao Honghui¹, Zhang Huaqin¹, Xun Sheng¹, Li Chong¹, Wu Wei³

1. Research Institute of Exploration and Development, PetroChina Yumen Oilfield Company, Jiuquan 735000, Gansu, China;
2. School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621000, Sichuan, China;
3. Geological Research Institute of CNPC Logging Co., Ltd., Xi'an 710000, China

Received:2020-06-03 Online:2021-11-26 Published:2021-11-24
Supported by:
Supported by the Science and Technology Project of CNPC (2018D-0704)

摘要/Abstract

摘要： 综合利用铸体薄片、X射线衍射、阴极发光、扫描电镜、物性分析及镜质体反射率和包裹体温度等资料，结合岩心观察法，对Bongor盆地下白垩统碎屑岩储层基本特征及成岩作用进行了研究。依据胶结物的体积分数及形态、黏土矿物组分的分布、岩石结构镜下特征及孔隙演化、有机质热演化等证据划分了岩石成岩阶段，并分析了成岩作用对物性的影响。结果显示：该区储层岩石类型以长石砂岩为主，胶结物以碳酸盐和黏土矿物为主；溶孔-粒间孔组合型储集性最好，粒间孔-溶孔组合型次之；成岩作用是控制储层物性的主要因素，成岩作用主要包括压实作用、胶结作用、交代作用和溶蚀作用；压实作用和胶结作用是破坏性成岩作用，二者分别使原始孔隙度损失54.93%和31.30%，岩石颗粒中长石、碳酸盐胶结物等易溶物质发育，溶蚀作用是主要建设性成岩作用；目的层成岩阶段以中成岩A期为主，成岩作用弱-中等。

关键词: 储层特征, 成岩作用, 碎屑岩, Bongor盆地, 下白垩统, 乍得南部

Abstract: Based on the data of cast thin section, X-ray diffraction, cathodoluminescence, scanning electron microscope, physical property analysis, vitrinite reflectivity and wrapping temperature, combined with core observation method, the basic characteristics and diagenesis of Lower Cretaceous clastic reservoir in Bongor basin are studied. According to the volume fraction and morphology of cement, the distribution of clay mineral components, microscopic characteristics of rock structure, pore evolution and thermal evolution of organic matter, the rock diagenetic stages are divided, and the influence of diagenesis on physical properties is analyzed. The results show that:The reservoir rock type in this area is mainly feldspathic sandstone, and the cement is mainly carbonate and clay minerals; Dissolved pore intergranular pore combination has the best reservoir performance, followed by intergranular pore dissolved pore combination; Diagenesis mainly includes compaction, cementation, metasomatism and dissolution; The diagenetic stage of the target layer is mainly middle diagenetic stage A, and the diagenesis is weak to medium; Diagenesis is the main factor controlling reservoir physical properties. Compaction and cementation are destructive diagenesis, which make the original porosity lose 54.93% and 31.30% respectively; In the rock particles, feldspar, carbonate cement and other soluble substances are developed, with strong dissolution, which is the main constructive diagenesis.

Key words: reservoir characteristics, diagenesis, clastic rock, Bongor basin, Lower Cretaceous, southern Chad

中图分类号:

TE112.23

陶永富, 李达, 黄长兵, 廖鸿辉, 张华琴, 寻升, 李翀, 吴伟. 乍得南部Bongor盆地下白垩统碎屑岩储层成岩作用及其对物性的影响[J]. 吉林大学学报(地球科学版), 2021, 51(6): 1689-1699.

Tao Yongfu, Li Da, Huang Changbing, Liao Honghui, Zhang Huaqin, Xun Sheng, Li Chong, Wu Wei. Diagenesis of Lower Cretaceous Clastic Reservoir and Its Influence on Physical Properties in Bongor Basin, Southern Chad[J]. Journal of Jilin University(Earth Science Edition), 2021, 51(6): 1689-1699.

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乍得南部Bongor盆地下白垩统碎屑岩储层成岩作用及其对物性的影响

Diagenesis of Lower Cretaceous Clastic Reservoir and Its Influence on Physical Properties in Bongor Basin, Southern Chad

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