## 4 Results
### Types and Characteristics of Logging Facies  
In this paper, the drilling core data are used as a constraint to identify and classify sedimentary subfacies and microfacies by analyzing the morphological features of conventional logging curves, and to improve the accuracy of single-well sedimentary facies interpretation (Figure 5). The main types of logging curves used are the natural gamma curve and the resistivity curve. Figure 4: (**a**) Well ST 1, 1674.3 m, Xiaoerbulake Formation, dolomitic gypsum-salt rock, hand specimen; (**b**) Well ST 1, 1674.3 m, Xiaoerbulake Formation, dolomitic gypsum-salt rock, cross-polarized light; (**c**) Well ZS 5, 6193.95 m, Awatage Formation, dolomitic gypsum-salt rock, hand specimen; (**d**) Well ZS 5, 6193.95 m, Awatage Formation, dolomitic gypsum-salt rock, cross-polarized light. Dolomite flat microfacies. The dolomite flat microfacies primarily consist of fine-grained dolomite, which is revealed by well ZS 5 in the Middle Cambrian. The GR and RD curves are predominantly box-shaped, with the tooth-like feature within. Gypsiferous dolomite flat microfacies. The gypsiferous dolomite flat microfacies is characterized by a low GR value and medium-high resistivity value. Argillaceous dolomite flat microfacies. The argillaceous dolomite with the GR value typically rising and the resistivity value declining as the mud content increases. The GR and RT curves display a finger-like feature. Gypsum-salt lake microfacies. This microfacies belong to the sedimentary subfacies of lagoons, primarily composed of gypsum and salt rocks. They often display a composite form of box or box with tooth shape in their well logging-curve characteristics. As revealed in well ST 1, at depths of 1550-1650 m, the GR- and RT-curve form of the box or a box with tooth shape, with low natural-gamma values and medium-high resistivity values are shown. Taking well ZS 5 as an example, the restricted-platform facies is discussed in detail. The well is located in the northern part of the Bachu Uplift, with the Middle-Lower Cambrian being restricted-platform facies. As shown in Figure 6, the Avatage Formation is mainly composed of gypseous dolomite, with a high content of gypsum and low GR values. The Shayilike Formation exhibits an alternation of dolomite-flat and gypseous dolomite-flat microfacies, and shows generally straight GR curves at low values, which fluctuate in some intervals due to the shale content increase in some well sections. The Xiaoerbulake Formation and Wusongger Formation are predominantly composed of argillaceous dolomite and argilliferous dolomite; thus, the Lower Cambrian belongs to argillaceous dolomitic flat microfacies. The Middle Cambrian is of restricted-platform facies, including both tidal flat and lagoon subfacies (Figure 6). Figure 5: Characteristics of logging curves for different sedimentary microfacies of the Middle Cambrian in the study area. Based on the crosswell profile in the southwest Tarim Basin, the central and western areas of the basin are in a restricted-platform environment during the Middle Cambrian (Figure 7). In the Awatage Formation and Shayirike Formation, there are extremely thick layers of gypsum, salt, gypsiferous dolomite, gypsiferous mudstone and argillaceous dolomite, with a continuous and stable lateral distribution. Gypsum-salt rocks are primarily distributed in the Bachu area. In well K 2, there are salt rocks and argillaceous dolomite developed in the Awatag Formation, representing the salt-lake microfacies. In the Shayirike Formation, its primary lithology are white salt, dolomite, white gypsum, and mudstone. In well ST 1, thick layers of gypsum in the Awatag Formation are developed, representing the development of gypsum lagoon deposits. In the Shayirike Formation, gypsum mudstone, gypsum, gabbro and gypsum mudstone are developed. In well MB 1 and BT 5, there mainly develop salt rocks. In well MB 4 and F 1, there are interbedded salt and gypsum in the Awatag Formation, with deposits of gray flat microfacies in the Shayilike Formation.