Development characteristics of organic pore in the continental shale and its genetic mechanism: a case study of Shahezi Formation shale in the Changling fault depression of Songliao Basin

被引：0
|
作者：
Gao F. [1 ,2 ]
Song Y. [1 ,2 ,3 ]
Liang Z. [1 ,2 ]
Li Z. [1 ,2 ]
Yuan Y. [4 ]
Zhang Y. [1 ,2 ]
Chen L. [1 ,2 ]
Guo W. [5 ]
机构：
[1] State Key Laboratory of Petroleum Resources and Prospecting, Beijing
[2] Unconventional Oil and Gas Institute, China University of Petroleum, Beijing
[3] PetroChina Research Institute of Petroleum Exploration and Development, Beijing
[4] Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing
[5] Xi'an Center, China Geological Survey, Xi'an, 710054, Shaanxi
来源：
Shiyou Xuebao/Acta Petrolei Sinica | 2019年 / 40卷 / 09期
关键词：
Maceral; Organic pores; Pore heterogeneity; Shahezi Formation shale; Songliao Basin;
D O I：
10.7623/syxb201909002
中图分类号：
学科分类号：
摘要：
Organic pores in the continental shale show a relatively strong heterogeneity. Taking the Shahezi Formation shale in the Changling fault depression of Songliao Basin as an example, and based on observation using the field emission scanning electron microscopy and optical microscopy, this paper explores the heterogeneity characteristics and genetic mechanism of organic pores in the continental shale. The results show that there are four main factors controlling the heterogeneity of organic matters in the continental shale, i.e., remnants of primary organic pores, differences in hydrocarbon generation potential, differences in the solid bitumen reflectance and catalyses of clay minerals. Due to the fact that the cell lumens were not filled or subjected to external force, the components with higher plant fiber structure, such as telinite, fusinite, semi-fusinite and sclerotinite, formed the fold superimposed with residual pores. Pores are best developed in solid bitumen, followed by vitrinite and intertinite; the weight percentage of carbon in the three components increases successively, indicating that the difference in pore development among the three organic matters is essentially controlled by the difference in the hydrocarbon generation potential. Not all of the organic pores are developed in solid bitumen. Statistics show that the porous solid bitumen mostly has the reflectivity of 1.60%-2.00%, in the stage of petroleum cracking and gas generation; the non-porous solid bitumen mostly has the reflectance of 1.20%-1.60%, in the stage of kerogen cracking and hydrocarbon generation. Under the catalyses of clay minerals, almost all solid bitumens in the organoclay complex are developed with rich honeycomb pores. The specific catalytic activity can be enhanced by illite, thus facilitating the formation of gaseous hydrocarbon and the generation of pores. © 2019, Editorial Office of ACTA PETROLEI SINICA. All right reserved.
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页码：1030 / 1044
页数：14
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