Morphology types of microscopic storage space in shales and large-volume FIB-SEM 3D reconstruction: A case from the second member of Kongdian Formation in the Cangdong Sag, Bohai Bay Basin

FAN Yuchen, LIU Keyu, PU Xiugang, ZHAO Jianhua

doi:10.11698/PED.20220280

0 20221017 - 20221017

DOI: https://doi.org/10.11698/PED.20220280

Morphology types of microscopic storage space in shales and large-volume FIB-SEM 3D reconstruction: A case from the second member of Kongdian Formation in the Cangdong Sag, Bohai Bay Basin

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1. China University of Petroleum (East China), Qingdao 266580, China;
2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;
3. PetroChina Dagang Oilfield Company, Tianjin 300280, China

Received date: 2022-06-21

Revised date: 2022-07-29

Online published: 2022-08-15

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Abstract

This study combines three-dimensional reconstruction of large volume focused ion beam scanning electron microscopy (FIB-SEM) with SEM observation, automatic mineral identification and large-area splicing of SEM images to characterize and classify the microscopic distribution patterns and 3D pore structures of shales in the second member of the Paleogene Kongdian Formation (Kong 2) in the Cangdong Sag of the Bohai Bay Basin. It is shown that: (1) The Kong 2 Member can be divided into seven types according to according to the distribution patterns of reservoir spaces: felsic shale with micron intergranular pores, felsic shale with intergranular fissures, felsic shale with intergranular pores, hybrid shale with intergranular pores and fissures, hybrid shale with intergranular pores, clay-bearing dolomitic shale with intergranular pores, and clay-free dolomitic shale with intergranular pores. (2) The reservoir of the intergranular fracture type has better storage capacity than that of intergranular pore type. For reservoirs with storage space of intergranular pore type, the dolomitic shale reservoir has the best storage capacity, the hybrid shale comes second, and the felsic shale is the dead last. (3) The felsic shale with intergranular fracture has the best storage capacity and percolation structure, making it the first target in shale oil exploration. (4) The LV-FIB-SEM 3D reconstruction method is able to characterize a large shale volume while maintaining relatively high spatial resolution, and has been demonstrated an effective method in characterizing strongly heterogeneous continental shales.

Key words： shale oil; pore structure; LV-FIB-SEM 3D reconstruction; the Paleogene Kongdian Formation; Cangdong Sag; Bohai Bay Basin

Cite this article

FAN Yuchen, LIU Keyu, PU Xiugang, ZHAO Jianhua . Morphology types of microscopic storage space in shales and large-volume FIB-SEM 3D reconstruction: A case from the second member of Kongdian Formation in the Cangdong Sag, Bohai Bay Basin[J]. Petroleum Exploration and Development, 0 : 20221017 -20221017 . DOI: 10.11698/PED.20220280

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