在对凹陷主干地震剖面地震反射界面、大型湖泛面，测井曲线岩性、岩相标志等

Based on the analysis of the seismic reflection interface of the main seismic section of the sag, large lake flooding surface, logging curve lithology, lithofacies marks, etc., six sequence interfaces were identified in the Xingouzu Formation of Paleogene in the study area From bottom to top are XSB1, XSB2, XSB3, XSB4, XSBS, XSB6. Only the features of the XSB1 interface are described below. <br>The sequence interface xsB1 roughly corresponds to the interface between Xingouzu Formation and Shashi Formation. The Xingouzui Formation is in unconformity with the formation of the Xiafushashi Formation. The unconformity surface is the sedimentary facies abrupt change surface or integration surface in the sag zone. On the seismic section, there is a T9 reflection interface, which shows a low frequency, 3 ^ 'S phases in the depression, strong energy and good continuity, and 1 ^' 2 phase on the uplift, weak energy and poor continuity. The contact relationship between the top and the super-super is generally observed on the slope from the depression to the uplift (Figure 4-1). XSB1 develops in interbedded layers consisting mainly of thin layers of sand, mudstone, and a small amount of gypsum mudstone (Figure 4-2). Below the interface is the interlayer of mud gypsum and thenardite, which belongs to the central salt lake sediment, and above the interface is the interlayer of sand and mudstone, belonging to the freshwater lake sediment, indicating that this interface is the salinity conversion surface of the lake water body.

Based on the analysis of seismic reflection interface, large lake surface, logging curve rock, rock phase marker, etc., 6 sequence interfaces were identified in the ancient near-system new trench tsui group in the study area, with XSB1, XSB2, XSB3, XSB4, XSB4, XSBS, XSB6, XSB6, XSBS, XSB6. Only the features of the XSB1 interface are described below.<br>The sequence interface xsB1 roughly corresponds to the interface between the new ditch group and the sha city group. The xingou Tsui group did not integrate contact with the formation of the lower Fusha city group, and did not integrate the surface in the depression zone as the sedimentary phase mutation surface or the integrated surface. On the seismic profile for the T9 reflection interface, the performance of low frequency, depression within 3'S phase, energy strength, continuity is better, bulge on the 1'2 phase, weak energy, less continuity, can be observed to cut the top, super-super and other contact relationship, in the depression transition slope can generally observe a more obvious cut relationship (Figure 4-1). XSB1 develops in a cross-layer of thin sand, mud rock, and a small amount of plaster edgy rock (Figure 4-2). Under the interface is mud paste rock and manite mutual layer, is a central salt lake sediment, above the interface is sand mud rock mutual layer, is a freshwater lake sediment, indicating that this interface is the lake water salinity conversion surface

Based on the analysis of seismic reflection interface, large Lake flood surface, logging curve lithology and lithofacies mark of the main seismic section in the depression, six sequence interfaces are identified in the neogouzui formation of Paleogene in the study area, which are xsb1, xsb2, xsb3, xsb4, xsbs and xsb6 from bottom to top. Only the characteristics of xsb1 interface are described below.<br>The sequence boundary xsb1 roughly corresponds to the interface between the Xingouzui Formation and Shashi formation. The unconformity of Xingouzui Formation and the underlying Shashi formation is in contact, and the unconformity surface is the sedimentary facies mutation surface or integration surface in the depression belt. On the seismic section, it is T9 reflection interface, showing low frequency, 3 ^'s phases in the depression, strong energy, good continuity, 1 ^'2 phase in the uplift, weak energy, poor continuity, and the contact relationship of roof cutting and superelevation can be observed, and the obvious cutting relationship can be observed on the slope of transition from depression to uplift (Fig. 4-1). Xsb1 is developed in the interbed with thin sand, mudstone and a small amount of gypsum mudstone (Fig. 4-2). Under the interface, there is an interbedding of argillite and mirabilite, which belongs to the central salt lake deposit. Above the interface, there is an interbedding of sandstone and mudstone, which belongs to the fresh water lake deposit, indicating that this interface is the lake water salinity conversion surface<br>