| 基于埋深变化的川南龙马溪组页岩孔隙特征及控制因素分析 |
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| 引用本文： | 陈洋,唐洪明,廖纪佳,罗超,赵圣贤,郑马嘉,钟权.基于埋深变化的川南龙马溪组页岩孔隙特征及控制因素分析[J].中国地质,2022,49(2):472-484. |
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| 作者姓名： | 陈洋 唐洪明 廖纪佳 罗超 赵圣贤 郑马嘉 钟权 |
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| 作者单位： | 1. 西南石油大学地球科学与技术学院;2. 中国石油西南油气田公司;3. 中国石油化工股份有限公司西北石油局石油工程技术研究院 |
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| 基金项目： | 国家自然科学青年基金项目（41702164）； |
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| 摘 要： | 研究目的]中国浅层-中深层页岩气勘探开发技术已经趋于成熟,深层页岩成为下一步勘探开发的重点,探明不同埋深条件下页岩的孔隙特征及其控制因素利于推动深层页岩的评优选区工作.研究方法]本文基于核磁共振、场发射扫描电镜和X-射线衍射等实验分析手段,对比性评价了川南地区不同深度的龙马溪组页岩孔隙度、孔隙结构参数特征并进行影响...
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| 关 键 词： | 四川盆地 页岩气 龙马溪组 孔隙度 孔隙特征 压力系数 深度 油气勘查工程 |
| 收稿时间： | 2020/10/21 0:00:00 |
| 修稿时间： | 2021/1/5 0:00:00 |
Analysis of shale pore characteristics and controlling factors based on variation of buried depth in the Longmaxi Formation, Southern Sichuan Basin |
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| CHEN Yang,TANG Hongming,LIAO Jiji,LUO Chao,ZHAO Shengxian,ZHENG Maji,ZHONG Quan.Analysis of shale pore characteristics and controlling factors based on variation of buried depth in the Longmaxi Formation, Southern Sichuan Basin[J].Chinese Geology,2022,49(2):472-484. |
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| Authors: | CHEN Yang TANG Hongming LIAO Jiji LUO Chao ZHAO Shengxian ZHENG Maji ZHONG Quan |
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| Institution: | School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, Sichuan, China;Petrochina Southwest Oil & Gasfield Company, Chengdu 610056, Sichuan, China; Petroleum Engineering Technology Research Institute, Sinopec Northwest China Petroleum Bureau, Urumqi 830011, Xinjiang, China |
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| Abstract: | This paper is the result of oil and gas exploration engineering.Objective]With the maturity of exploration and development technology in shallow and medium-deep shale, deep shale has become a focus of next exploration and developmentin China. Clarifying the pore characteristics of shale under different burial depths and its controlling factors is conducive to promoting the selection and evaluation of deep shale gas.Methods]Methods such as nuclear magnetic resonance, field emission scanning electron microscopy and X-ray diffraction were used to comparatively evaluate the porosity and pore structure of Longmaxi-Formation in southern Sichuan Basin, and its influencing factors were also discussed.Results]With the increase of burial depth, the total porosity shows a downward trend, and the main porosity of shale below 3000 m, between 3000-3500 m and deeper than 3500 m are 4%-8%, 3%-7% and 3%-6%, respectively.There is no significant difference in pore types and size distribution of the Longmaxi Formation shale at different depths, and a large number of nano-scale organic pores, mineral intergranular pores, intragranular dissolved pores and micro-fractures are developed at different depth.Conclusions]A large amount of organic matter formed at high U/Th ratio and low Ti content is the key factor for the development of deep shale pores. High siliceous mineral content and high formation pressure coefficient could protect pores of shale reservoirs and slow down compaction of its overlying strata. However, excessive burial depth wouldalso lead to a reduction of shale pores and porosity.Highlights: Based on a large amount of data, the variation rules of porosity at different depths is discussed. Controlling factors of shale pore characteristics are discussed from multiple perspectives. |
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| Keywords: | Sichuan Basin shale gas Longmaxi Formation porosity pore characteristics pressure coefficient depth oil and gas exploration engineering |
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