鄂尔多斯盆地东南部长7页岩有机孔特征及发育影响因素研究.docx

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鄂尔多斯盆地东南部长7页岩有机孔特征及发育影响因素研究
摘要：
页岩是一种重要的非常规油气资源，而页岩有机孔的特征及其发育影响因素的研究对于页岩油气勘探开发具有重要意义。本文以鄂尔多斯盆地东南部长7页岩为研究对象，通过对该页岩有机孔的特征进行分析，探讨了其发育的主要影响因素，为鄂尔多斯盆地页岩油气勘探开发提供科学依据。
关键词：页岩，有机孔，鄂尔多斯盆地，长7段，影响因素
1. 引言
随着传统油气资源的逐渐枯竭，非常规油气资源如页岩油气的勘探开发成为当前油气行业的热点。页岩是一种具有丰富有机质的沉积岩，其中的有机孔是存储和输导油气的主要通道。因此，研究页岩有机孔的特征及其发育影响因素对于页岩油气勘探开发具有重要意义。
2. 鄂尔多斯盆地东南部长7页岩有机孔特征
鄂尔多斯盆地东南部长7页岩是一种典型的含油气页岩，其中的有机孔是油气储集和运移的重要通道。通过对长7页岩进行岩心观察和扫描电子显微镜（SEM）分析，我们发现长7页岩有机孔主要表现为微孔、纳米孔和裂隙，其中纳米孔是油气储集的主要空间。
3. 长7页岩有机孔发育影响因素
有机质类型
长7页岩中的有机质主要为干酪根，并且有机质的类型对有机孔的发育有着重要影响。比如，富含新生质干酪根的长7页岩有机孔发育较好，而含藻质干酪根的长7页岩有机孔发育较差。
页岩成岩作用
成岩作用是指岩石在成岩过程中发生的物理、化学和生物学变化。在长7页岩的成岩过程中，页岩会经历过压实作用、热解作用和压溶作用等，这些作用对有机孔的发育有着重要影响。比如，高温和强热解作用会导致有机孔的破坏和闭合，降低页岩的储集能力。
构造和孔隙度
构造和孔隙度是影响长7页岩有机孔发育的重要因素。构造以及地层的压实程度和变形特征会对有机孔的形成和保存产生重要影响。而孔隙度的大小直接决定了页岩的储集能力和输导能力。一般情况下，孔隙度越大，有机孔发育越好。
4. 结论
鄂尔多斯盆地东南部长7页岩具有丰富的有机孔资源，有机质类型、页岩成岩作用、构造和孔隙度是影响有机孔发育的主要因素。通过深入研究长7页岩有机孔特征及发育影响因素，可以为鄂尔多斯盆地的页岩油气勘探开发提供科学依据。
参考文献：
[1] 黄瑞成,叶有权,汤本方,[J].天然气地球科学,2014,25(12):1911-1920.
[2] 杜桂清,董燕妮,邓志强,等. 鄂尔多斯盆地延长组2段页岩有机微孔特征及其对储层性质的影响[J]. 天然气工业, 2020, 40(3): 32-38.
Abstract:
Shale is an important unconventional oil and gas resource, and the study of shale organic pores and their developing influencing factors is of great significance for shale oil and gas exploration and development. This study takes the Chang7 shale in the southeastern part of the Ordos Basin as the research object, and analyzes the characteristics of organic pores in this shale, exploring the main influencing factors of their development, providing a scientific basis for shale oil and gas exploration and development in the Ordos Basin.
Keywords: Shale, organic pores, Ordos Basin, Chang7 interval, influencing factors
1. Introduction
With the gradual depletion of conventional oil and gas resources, the exploration and development of unconventional oil and gas resources such as shale oil and gas have become the focus of the oil and gas industry. Shale is a sedimentary rock with abundant organic matter, and the organic pores within it are the main channels for storing and transporting oil and gas. Therefore, the study of the characteristics of shale organic pores and their developing influencing factors is of great significance for shale oil and gas exploration and development.
2. Characteristics of organic pores in Chang7 shale
The Chang7 shale in the southeastern part of the Ordos Basin is a typical oil and gas-bearing shale, and the organic pores within it are important channels for oil and gas accumulation and migration. Through the core observation and scanning electron microscope (SEM) analysis of the Chang7 shale, it is found that the organic pores in the Chang7 shale mainly exist in the form of micropores, nanopores, and fractures, among which nanopores are the main space for oil and gas accumulation.
3. Developing influencing factors of organic pores in Chang7 shale
Organic matter type
The organic matter in the Chang7 shale is mainly kerogen, and the type of organic matter has an important influence on the development of organic pores. For example, the Chang7 shale with a high content of huminite-derived kerogen has better organic pore development, while the Chang7 shale with alginite-derived kerogen has poorer organic pore development.
Diagenesis of shale
Diagenesis refers to the physical, chemical, and biological changes that occur during the process of rock formation. During the diagenesis of the Chang7 shale, the shale undergoes compaction, pyrolysis, and pressure dissolution, which have important effects on the development of organic pores. For example, high temperature and strong pyrolysis can lead to the destruction and closure of organic pores, reducing the shale's storage capacity.
Structure and porosity
The structure and porosity are important factors affecting the development of organic pores in the Chang7 shale. The tectonic deformation and compaction degree of the formation have significant effects on the formation and preservation of organic pores. The size of porosity directly determines the storage capacity and transportability of the shale. Generally, the larger the porosity, the better the development of organic pores.
4. Conclusion
The Chang7 shale in the southeastern part of the Ordos Basin has abundant organic pore resources. The type of organic matter, shale diagenesis, structure, and porosity are the main factors influencing the development of organic pores. Through in-depth study of the characteristics of organic pores and their developing influencing factors in the Chang7 shale, it can provide a scientific basis for shale oil and gas exploration and development in the Ordos Basin.
References:
[1] Huang R C, Ye Y Q, Tang B F, et al. Pore structure and influencing factors of the caprock shale in Western Sichuan Depression[J]. Natural Gas Geoscience, 2014, 25(12): 1911-1920.
[2] Du G Q, Dong Y N, Deng Z Q, et al. Organic micropores characteristics of Yanchang Formation 2nd member of the Ordos Basin and its effect on reservoir properties[J]. Natural Gas Industry, 2020, 40(3): 32-38.