The Shunbei oil and gas field is located in the low uplift of Shuntuoguole, which is affected by the multistage tectonic movement of the basin. There are several strike-slip fault systems that have developed from north to south, and the geological characteristics of the reservoir are controlled by different combination of fault zones. A large cavernous fracture system is developed in the main fault zone. The stress inversion calculation and analysis methods are established for various types of faults. The three-dimensional stress field distribution in the study area was obtained through numerical simulation. The magnitude and direction of the stress field were analyzed at different depths and locations in different types of faults, including at the tip, in the middle, adjacent to the fault, and in the intersection to determine the magnitude and spatial distribution behavior of the stress field in the multi-fault area around the well. On the basis of the stress field simulation, the distribution of some natural fractures is preliminarily explained according to the statistical fracture distribution behavior, and a hydraulic fracturing process simulation is performed to reveal the distribution and influence range generated by hydraulic fracturing, which provides guidance for subsequent hydraulic fracturing scheme designs.
Deep carbonate reservoirs contain abundant oil and gas resources. Sixty percent of the world's proven oil and gas reserves are marine carbonate reservoirs, which have become an important field of oil and gas exploration and development. Shunbei Oilfield is located in the Tarim Basin, with an average depth of more than 7500 m. It is an ultra-deep fault-fracture carbonate reservoir controlled by main faults and formed by multistage karst transformation. How the existing fault zone disturbs the present in situ stress field and how the disturbed stress field and the natural fractures near the fault affect the extension direction and range of hydraulic fractures need to be further clarified to better stimulate the complex fault zone reservoir[1-4].
