In recent years, with the continuous development of resources, countries began to expand the exploration and exploitation of resources. Tight sandstone beds have been the focus of resource development in recent years. The purpose of this study is to provide a theoretical basis for the development of tight sandstone layers by exploring the transformation effect of fracture modeling on super-deep tight sandstone reservoirs. Firstly in this paper, the principle of the laser scanning confocal microscope, advantages and disadvantages and so on various aspects has carried on the detailed introduction, then the fracture types and formation mechanism of tight sandstone in detail, finally by means of fracture modeling experiment, establish the 3 d data model of crack, and on this basis, from three angles analyzes the crack modeling on ultra-deep tight sandstone reservoir. The experimental results show that the degree of fracture porosity is limited to the ability to improve the porosity of the reservoir, and the porosity of most fractures is less than 0.1%, accounting for 61%. The permeability of sandstone reservoirs without fracture matrix is between (0.01-0.1)×10-3μm2, and that of sandstone reservoirs with fracture matrix is generally between (1-10)×10-3μm2. The maximum permeability of this type of reservoirs is 25.8×10-3μm2, which is 1 to 2 quantity levels higher than that of those without fracture matrix. In general, fracture modeling plays an important role in the transformation of tight sandstone reservoirs in two aspects: the transformation of reservoir physical properties and the control of reservoir resource production.

Rong Sun. Fracture Modeling under Laser Scanning Confocal Microscope for the Transformation of Ultra-deep Tight Sandstone Reservoirs. International Journal of Engineering Technology and Construction (2021), Vol. 2, Issue 1: 45-54. https://doi.org/10.38007/IJETC.2021.020104.

[1] Wu J S, Chung Y C, Chien J J.(2018). “Improved Axial Point Spread Function in a Two-frequency Laser Scanning Confocal Fluorescence Microscope”, Journal of Biomedical Optics, 23(1),pp.1. DOI: 10.1117/1.JBO.23.1.010502

[2] Job T V, Narayana G T, Venkappa K K.(2018). “Remineralization Potential of Three Different Dentifrices using Raman Spectroscopy and Confocal Laser Scanning Microscope”, Journal of Contemporary Dental Practice, 19(4),pp.420-425.

[3] Banzhaf C A, Lin L L, Dang N.(2017). “The Fractional Laser-induced Coagulation Zone Characterized over Time by Laser Scanning Confocal Microscopy-A Proof of Concept Study: FRACTIONAL LASER-INDUCED COAGULATION ZONE”, Lasers in Surgery & Medicine, 50(2),pp.70. DOI:10.1002/lsm.22758

[4] Huimin Xie, Satoshi Kishimoto, Bing Pan.(2017). “OS1-2-3 Experimental Study on the Laser Scanning Confocal Microscopy Moire Method”, Chemical & Pharmaceutical Bulletin, 16(11),pp.2101-2106.

[5] Bohn S, Sperlich K, Allgeier S.(2018). “Cellular in Vivo 3D Imaging of the Cornea by Confocal Laser Scanning Microscopy”, Biomedical Optics Express, 9(6), pp. 2511. DOI: 10.1364/boe.9.002511

[6] Staso S D, Agnifili L, Ciancaglini M.(2018). “In Vivo Scanning Laser Confocal Microscopy of Conjunctival Goblet Cells in Medically-controlled Glaucoma”, Vivo, 32(2),pp.437-443.

[7] Huang X, Li Z, Zhou G.(2017). “Fracture Porosity Modeling of Fractured Tight Sandstone Reservoir: A Case Study of the Reservoir in Member 2 of Xujiahe Formation, Pingluoba structure, Sichuan Basin”, Shiyou Xuebao Acta Petrolei Sinica, 38(5),pp.570-577.

[8] Liu C, Zhang R, Zhang H.(2017). “Genetic Types and Geological Significance of Micro Pores in Tight Sandstone Reservoirs: A Case Study of the Ultra-deep Reservoir in the Kuqa Foreland Thrust Belt, NW China”, Shiyou Xuebao Acta Petrol Sinica, 38(2),pp.150-159.

[9] Lu X, Zhao M, Liu K.(2018). “Forming Condition and Mechanism of Highly Effective Deep Tight Sandstone Gas Reservoir in Kuqa Foreland Basin”, Shiyou Xuebao/acta Petrolei Sinica, 39(4),pp.365-378.

[10] Gao W J, Li X Q, Zhang G W.(2018). “The Relationship Research Between Densification of Reservoir and Accumulation of the Deep Tight Sandstone Gas Reservoirs of the Kelasu Tectonic Zone in Kuqa Depression, Tarim Basin”, Natural Gas Geoscience, 29(2),pp.226-235.

[11] Huang W, Lu S, Osman S H.(2017). “Quality Grading System for Tight Sandstone Reservoirs in the Quantou 4 Member, Southern Songliao Basin, Northeast China”, Interpretation, 5(4),pp.1-60.