Reservoir space and controlling factors of lacustrine laminated shale oil reservoir: A case study of Cretaceous Qingshankou Formation in the Changling Sag, southern Songliao Basin, NE China
Received date: 2023-10-05
Revised date: 2024-01-17
Online published: 2024-04-07
Supported by
The Scientific Research Project of CNPC(2021DJ0103)
Based on thin section identification, the organic geochemistry, XRD, combined with scanning electron microscopy, N2 isothermal adsorption and high pressure mercury injection tests, the characteristics of laminated shale lithofacies were identified and the reservoir pore structure was comprehensively analyzed, and then the favorable shale lithofacies and main controlling factors of pore development were clarified. According to the classification standard of “abundance of organic matter and mineral composition”, the shale of Qingshankou Formation is divided into seven lithofacies: M-L, S-M, M-M, C-M, S-H, M-H and C-H. The kind of C-H shale lithofacies is regarded as the favorable type in the study area, because it has absolute hydrocarbon generation potential, and its reservoir space is well developed with superior pore structure parameters, which is dominated by slit clay mineral intercrystalline pores, intergranular pores and micro-fractures. The shale reservoir space of Qingshankou Formation is controlled by laminae development, TOC content and mineral composition. The felsic lamination effectively alleviates overlying rock compaction, organic acid diffusion and formation of overpressure fractures improve macropore volume ratio, and the clay mineral intercrystalline pores and fractures provide the main specific surface area and pore volume.
Jialin WAN , Zhichao YU , Wenhui HUANG . Reservoir space and controlling factors of lacustrine laminated shale oil reservoir: A case study of Cretaceous Qingshankou Formation in the Changling Sag, southern Songliao Basin, NE China[J]. Natural Gas Geoscience, 2024 , 35(9) : 1671 -1687 . DOI: 10.11764/j.issn.1672-1926.2024.01.010
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