The Structure And Evolution Of Alar Fault

Alar fault is a big fault of the western Qaidam Basin, Southern District, Hanging wall of fault developments Ga-South, Yuexi, Yuejinll, Yuedong, Yuedongdong, Yuejin III, and the petroleum and gas resources amounted to1.15milliont, has been proven about30million tons of petroleum reserves and On the basis of regional geology, fracture of the periphery, the basin basement, the stress field evolution, the use of3D seismic data, well logging and core samples, Alar on both sides of the fault zone rock mechanical properties, structural characteristics, the cross section structural characteristics, regional stress and fracture evolution of the characteristics of a preliminary analysis of the relationship between the fracture and reservoir have been found,as the following conclusions and understanding:1. Alar fault zone on both sides of rock mechanical properties of rock evolution in three phases:the plastic compaction stage, the elastic-plastic stage, the rupture phase. Rock plastic compaction stage depth of about0-1000m; rock elastic-plastic stage depth of about1000-2000m rupture phase of the depth of approximately2000m.2. Alar fault has NWW toward and the NNE toward. NWW toward plane dips south, the western end of the section dip about80°-85°; NNE toward the tendency to segment cross-section for the west-dipping, dip about75°.3. NWW towards segment of the Alar fault, breaking off from the whole is greater than the NNE to the segment-off distance, the maximum breaking distance of approximately2950m, and NNE breaking distance is smaller, the breaking distance is usually less than1000m.4. The top of the Alar fault cross-section as the "(?)" shape, the top of the section west tectonic depth of approximately500m east decreased, the depth of about500m to about3000m.5. Alar fault eastern section of the western part of the E1+2(Luyue River Group) of N21the (Xiayoushashan Group) and N22(Shangyoushashan Group) to Q (Now) the activitied of different characteristics. The E1+2(Luyue River Group) of N21the (Xiayoushashan Group), the western fault of NWW segment activity is larger than the eastern; and N22(Shangyoushashan Group) to Q (Now), fault western of NWW activitied magnitude smaller than the eastern, NNE section of the activity is relatively weak.