Technology Of Coherent Analysis And Its Application In The Fault Interpretation

The paper introduced seismic coherent analysis technology and its application in the fault interpretation of target area. In this paper, the target area is located in Sichuan Longgang district of oil and gas exploration.The main contents and results of this paper are listed as follows:(1) The paper reviewed in detail the principle of seismic coherence cube and the coherence algorithms of three generations. With comparing the results of C2, C3 coherent algorithm in practical applications, the paper employed C3 coherent algorithm to calculate the 3D target data at last. In order to achieve better effect, this thesis compared the different effect when using different parameters and picked up those optimal ones such as matrix type space combination and 11 ms window.(2) Based on the data of logging, drilling and seismic etc, synthetic seismograms of 6 wells were made to demarcate the target layer of Shaximiao. And then, the paper applied the technology of the three-dimensional seismic interpretation, seismic images analysis and coherent analysis, and explained 185 profiles along the survey line (inline3275-inline4200) and 500 horizontal slices of the study area. Finally, 143 faults of the target area were explained.(3) The paper not only used three-dimensional software to display the fault in the place, but also described the fault's element of this region such as trend and tendency. Some typical structural modes, such as imbricate structure, fault-propagation folds, pop up, arrested anticline, were analysis.(4) According to the interpretation and analysis of the fault and fracture zones, the target area was divided into three fracture zones which were in NW direction, and they matched the actual geological data well; After that, based on the analysis the faults'distribution and connectivity in the target area, the paper assessed the closure of the target layers of Shaximiao, which can provide basic materials for the effluent discharge.