鄂尔多斯盆地东南部延长组7段页岩有机孔发育特征及其影响因素

doi:10.11743/ogg20200213

Abstract

Abstract:

Recent studies have shown that organic pores are developed in the medium-to-low-maturity shale of the 7th member of Yanchang Formation in the Southeastern Ordos Basin, but the influencing factors on the development of organic pores in the continental shale reservoir need to be further understood.With the aid of argon ion polishing and FE-SEM observation, we observed the characteristics of organic pores in Chang 7 shale in the Southeastern Ordos Basin.Statistical analysis was made on the organic pore sizes in kerogen of different maturity and different types of migrated solid organic matters, and also on the ratio of organic pore area to the total organic matter area (S_R) of these organic matters.Thereaf-ter, main factors affecting the development of organic pores were discussed.The results indicate that organic pores were widely developed in shales of diverse maturity (R_o:0.5%-1.25%) in the Chang 7 member, but there were significant differences in the development of organic pores in kerogens and migrated solid organic matters.Sedimentary organic matter (kerogen) occurs mainly in the form of enrichment along beddings, isolated dispersion and combination with clay minerals in shale and has relatively lower degree of organic pore development.The ratio of the organic pore area to the total organic matter area ranges from 0% to 44.13%, averaging at 6.03%, but generally less than 10%.The majority of organic pores ranges from 10 nm to 40 nm in size.The migrated solid organic matters mainly occurs in inorganic mineral pores, including inter-particle pores/inter-particle dissolution pores in rigid particles, inter-particle pores/inter-particle dissolution pores between rigid particles and clay minerals, intercrystalline pores in pyrite of shale.These organic matters have relatively higher degree of organic pore development.The ratio of the organic pore area to the organic matter area varies from 0% to 46.51%, averaging at 23.05% and generally less than 30%.In addition, the pore size is larger, mainly ranging from 50 nm to 100 nm.The development of organic pores in the Chang 7 member shale is mainly controlled by the organic matter type, the abundance of migrated solid organic matters and the maturity of organic matter:positively correlated with higher content of migrated solid organic matters and more maturity of the organic matters.

Key words: type of solid organic matters, organic pore, shale, Yanchang Formation, Ordos Basin

CLC Number:

TE122.2

Zhenjia Cai, Yuhong Lei, Xiaorong Luo, Xiangzeng Wang, Ming Cheng, Lixia Zhang, Chengfu Jiang, Qianping Zhao, Jintao Yin, Likuan Zhang. Characteristics and controlling factors of organic pores in the 7th member of Yanchang Formation shale in the Southeastern Ordos Basin[J]. Oil & Gas Geology, 2020, 41(2): 367-379.

Figures/Tables 11

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Characteristics and controlling factors of organic pores in the 7th member of Yanchang Formation shale in the Southeastern Ordos Basin

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