STRIKE-SLIP CHARACTERISTICS, FORMING MECHANISMS AND CONTROLLING RESERVOIRS OF DAZHULUOGOU FAULTS

Dazhuluogou fault was confirmed the strike-slip fault, according to the field marks including steep fault plane, horizontal slickenside and upright step, and the seismic marks that the flower Structure was interpreted on the seismic cross-sections. Main fault and branch faults constituted the typical strike-slip fault system in plane. The spatial combination relation of faults in the western part of Junggar basin and the simple shear mechanical mode showed that the Dazhuluogou fault is an important branch of Daerbute fault, and belong to R’ shearing plane. Moreover, the physical simulation proved that the Dazhuluogou fault is a strike-slip fault and can develop derivative structures. The Dazhuluogou fault going along NW and laterally cutting through the northwestern margin of Junggar basin directly connected with Mahu depression and formed many triangular fault blocks with the branch faults. The comprehensive evaluation indicated that the sealing ability of Dazhuluogou faults with stopping movement is stronger, and fault blocks can form effective traps. So the strike-slip fault effectively controlled the hydrocarbon accumulation of northwestern margin in Junggar basin.