Exploration To Urban Active Fault Based On 3D Reservior Modeling

This work is supported by the key project "Detection to Active Fault and Evaluation of Seismic Hazard to the city of Handan, and Forecasting Project of its Earthquake Destruction" of China Earthquake Administration and Handan Municipal Government. With field inspection and selected data, using certain software, a quaternary strata 3D model of Handan city, Hebei Province is established. Analyzing the model, especially the activity of Taihang Mountain piedmont fault, we got such main conclusion:1. Based on sequence stratigraphy, the strata is divided from the selected drills. And the Quaternary stratigraphic framework of Handan city is established, dividing the Quaternary strata into four parts- Qh, Qp3O , Qp2Y and Qp1G.2. With all the selected drill data of Handan city, a drill database is established. A quaternary strata 3D model of Handan city is imitated by GOCAD and ArcGIS, and so are the bottom structural map of each horizon.3. Analyzing the 3D model and the contradistinction section of drills, we got: the stratum of Qh and Qp3 is smooth and flat, with a feature of a higher west, little difference between south and north and undistinctness of faults; there are several depocenters along S-N and N-W in the stratum of Qp2, and the evolution of the stratum is controlled by a couple of ruptures, which means the tectonic movement is active in this period of time.4. Since quaternary, main tectonic movements happened in Qp2 and have been stable in Qp3 and Qh. Taihang Mountain piedmont fault (F1) is the key of Handan's physiognomy. It is formed earlier and larger than other faults. Analyzing both from the 3D model and drills, we got: it may be active in Qp2, and did to the landform of Handan city, it has been stable since Qp3.