| 海陆过渡相与海相富有机质页岩储层特征差异 |
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| 引用本文： | 蔡光银,蒋裕强,李星涛,孙莎莎,付永红,谷一凡,王占磊,季春海.海陆过渡相与海相富有机质页岩储层特征差异[J].沉积学报,2022,40(4):1030-1042. |
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| 作者姓名： | 蔡光银 蒋裕强 李星涛 孙莎莎 付永红 谷一凡 王占磊 季春海 |
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| 作者单位： | 1.西南石油大学地球科学与技术学院，成都 610500 |
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| 基金项目： | 中国石油—西南石油大学创新联合体项目2020CX030101国家自然科学基金51674044 |
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| 摘 要： | 海陆过渡相页岩气逐渐成为非常规油气的接替能源，系统分析海相与海陆过渡相储层特征差异，可为海陆过渡相页岩气勘探开发提供借鉴。选取大吉区块山23亚段底部海陆过渡相、威远区块龙一11小层海相页岩，开展TOC、有机质显微组分、全岩—黏土X衍射、物性、氩离子抛光扫描电镜、氮气吸附、核磁共振等实验，厘清了海相与海陆过渡相页岩储层宏观参数与微观孔隙结构两方面差异。结果显示:与海相页岩储层相比，海陆过渡相页岩储层TOC含量高达10.91%，干酪根类型为Ⅱ2型，黏土矿物以高岭石为主，孔隙度与含气量略低。微观储层特征方面，海相页岩储层孔隙类型以有机孔为主，孔径分布介于10~50 nm，微裂缝主要为生烃增压缝和成岩缝，而海陆过渡相页岩储层孔隙类型以无机孔为主，孔径分布介于5~20 nm，有机孔多为孤立状不规则孔隙，微裂缝主要为有机质边缘缝和黏土矿物层间缝。在此基础上，初步揭示了海陆过渡相优质页岩储层孔隙发育受控于有机质和黏土矿物类型，阐释了页岩气赋存的优势孔隙类型为黏土矿物粒间孔。借鉴浅层海相页岩气的成功勘探实践经验，仍需加强有机质、矿物组分、孔隙赋气机制之间的三元耦合关系研究，以期为海陆过渡相页岩气的勘探开发提供坚实的理论支撑。
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| 关 键 词： | 浅层海相页岩 海陆过渡相页岩 山西组 储层宏观参数 微观孔隙结构 控制因素 |
| 收稿时间： | 2021-03-09 |
Comparison of Characteristics of Transitional and Marine Organic-rich Shale Reservoirs |
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| Abstract: | Transitional shale gas is gradually replacing unconventional oil and gas energy sources. Systematic analysis of the different properties of marine and transitional reservoirs provides a reference for the exploration and development of transitional shale gas. In this study， shale cores from the bottom of the Shan23 submember in the Daji Area and the L11 submember 1st small layer in the Weiyuan area were selected for TOC， organic matter maceral analysis， XRD， porosity testing， argon ion polishing SEM， N2 adsorption and NMR to clarify the differences in macro parameters and micropore structure between marine shale and marine terrestrial transitional shale reservoirs. It was found that， compared to marine shale reservoirs， the TOC content of transitional shale reservoirs is as high as 10.91%， with type II2 kerogen and mainly kaolinite clay minerals. The porosity and gas content are slightly lower than in marine shale reservoirs. At the micro-reservoir level， marine shale reservoirs generally contain 10?50 nm organic pores. The microfractures are mainly hydrocarbon-generating pressurized and diagenetic types. Mainly 5?20 nm inorganic pores occur in transitional shale reservoirs， with some mostly isolated irregular organic pores. The microfractures are mainly organic marginal and clay mineral interlayer fractures. These observations revealed that pore development in high-quality shale reservoirs of marine terrestrial transitional facies was controlled by the types of organic matter and clay minerals， and that intergranular clay mineral pores are the dominant pore type for shale gas occurrence. Comparing the successful exploration and practice of marine facies shale gas， it is recommended to strengthen the ternary coupling relationship between organic matter， mineral composition and the poregas generation mechanism to provide a solid foundation to support the exploration and development of transitional facies shale gas. |
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