Discovery and Significance of Seismite of Silurian in Member III at Shahejie Formation in Xianhe Area of Dongying Sag

Based on studies of regional tectonic setting and the observation of drilling cores, the seismite is recognized which mainly occurred in member Ⅲ at Shahejie formation in Xianhe area of Dongying sag. Many kinds of soft sedimentary deformation structures have been found in seismite, such as step micro-faults, pleated within layers, liquefaction sandstone and clay veins, vibrational liquefaction deformation structure and seismic breccias. Observing the drilling cores in He 152, Wang 59, Niu 38, Niu 22, and so on, it is found that the sequence of seismite is different due to the different structure and seismic intensity. The relationship between seismite character and seismic intensity show that different seismite structure are formed by different seismic intensity, and testified the relationship between seismite structure and ancient earthquake. Research on reservoir show that seismite is an efficient reservoir. It provides the theoretical foundation for the tectonic evolution studies and seismite recognition in Tarim basin, and supplies evidence for researching palaeo-seismicity