| Tight oil of Permian Lucaogou formation in Jimusar sag of Junggar basin is rich in natural resources,the pace of oil and gas exploration and development is slow.Low porosity and permeability of reservoir are the main restrictive factors.To a certain extent,natural fracture improves the storage capability of reservoir and it improves the permeability of tight reservoirs to a great extent.For the efficient development of research area,development of reservoir fracture of Lucaogou formation is studied.By making full use of field outcrop,core,rock thin section,conventional logging,imaging logging data,and combined with mud logging,3D seismic data and so on,the fractures of Lucaogou formation are recognized,described.With system research,the results are as follows: 1,various types of fracture are developed in Lucaogou formation,the most fractures type are bedding fissure and structural fracture.The scale of structural fracture is small,with high angles fissures being dominant.Fractures of P2l12 reservoir are most developed,maximum line density reached 4.75/m.2,fractures are mainly controlled by lithology,rock brittleness,single layer thickness and structural stress,mainly developed in Dolomitic siltstones.The reservoir of the target is better in the condition of brittleness.In region,strike of fractures is NWW-SEE-trending,NNE-SSW-trending to the northwest area.3,desserts of fracture predicted distribution of P2l22 reservoir is middle part of depression along J31-J174-J30 area,and J36_H,J33,J27 well fields along the pinch out belt.Desserts of fracture predicted distribution of P2l12 reservoir shows a north-south distribution pattern.The southern part is the internal zone of the boundary by J34-J30-J36_H-J25-J173 wells.Fracture is also found in reservoir of the mixed mudstone,so fractures maybe develop in the area along the developed fault.The results of the study provide some reference for the follow-up development of Jimusaer Sag. |
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