## 3 Actual Seismic Data Application
### Application Example in YGU Block  
Take the YGU block as an example. The target stratum in the study area is an Ordovician TO\({}_{2y}\) Formation-TO\({}_{12y}\) formation. Ascribed to multi-directional compressive stress, the current structure of Ordovician stratum is a dome anticline structure (Figure 12a), and the dip angle of TO\({}_{2y}\) Formation varies greatly, ranging from 5\({}^{\circ}\)-35\({}^{\circ}\) (Figure 12b). The reservoirs encountered during drilling are mainly caves, holes and fractures, with strong heterogeneity. Figure 11: RMS amplitude attribute plan of target layer of the HD-YK block. (**a**) the attribute plan based on original seismic data; (**b**) the attribute plan based on heterogeneous SWFA data obtained by this method. After years of exploration, researchers have always believed that the reservoir in the YGU block is controlled by a dome anticline structure and has a relatively unified oil-water interface. However, this view cannot solve three problems. First, the oil and gas development effect at the highest position of the structure is not the best. Second, there is no obvious relationship between the distribution of high-yield and high-efficiency wells and the height of the structure. Third, the wells located at the high position of the formation structure have rapid water cuts in production, while the wells located at the low position of the formation structure have no water production for a long time. At the same time, some researchers believe that the YGU block reservoir is controlled by strike slip faults, and the dome anticline structure only plays a role in the later adjustment and migration of oil and gas. This can solve the above three problems to a certain extent. However, this view has not been supported by direct evidence, such as earthquakes. The method in this paper is applied to carry out targeted research, and the SWFA characteristics of the FVRs as indicated in the arbitrary profile are clearly demonstrated (Figure 13). The RMS amplitude attribute plan along the target layer can clearly distinguish the distribution characteristics of FVRs along the fault zone (Figure 14). Based on the research results of the heterogeneous SWFA data volume, the researchers deployed a wildcat well. This well is located in the southwest wing of the structure and is designed to drill the SSFCRs. It is 6741 m away from the main reservoir area. Vertically, 1100 m is added downward on the basis of the original unified oil-water contact, and the vertical depth reaches 7083.7 m. Drilling results: the logging interpretation of the target layer is 85.5 m/five layers of an oil layer and poor oil layer, and 9.5 m/one layer of a water bearing oil layer. Oil tested results: the open hole section 7133-7380 m, 4 mm nozzle, oil pressure is 17.35 MPa, daily oil production is 150 m\({}^{3}\) and natural gas is 2450 m\({}^{3}\). The view that the reservoir in the YGU block is controlled by faults is corroborated by this wildcat well. It is proved that the method has good applicability in complex structural areas. This method has been applied in other blocks of FMOF, which can effectively improve the seismic wavefield abnormalities caused by fault-controlled heterogeneous fractures and caves and plays an important role in the prediction of FMOF reservoirs and guiding drilling into targets; guided by the effective improvement of the drilling success rate and the percentage of high-efficiency wells in the study area. The drilling success rate refers to the percentage of the number of industrial oil and gas wells obtained during the drilling test in the current year in the total number of wells, and the percentage of high-efficiency wells refers to the test production of the current year. The number of wells with an oil and gas equivalent of more than 50,000 tons accounted for the proportion of the total number of industrial oil and gas wells obtained from the oil test.