Study on the Fracture Development Characteristics and Highly Efficient Development Technology of the Fracture Porosity Type Reservoir

The northern area of the F oilfield is considered as the low porosity and ultra-low permeability carbonate reservoir. Dynamic analyses show that fractures are present in the northern area and that the reservoir has dual porosity characteristics. Therefore, a systematic study of the fracture development characteristics and the optimization of the injection-production well pattern was carried out in the northern area. This paper focuses on the northern area of the F oilfield, where the following studies were carried out: (1) The structure and fracture formation mechanism of the oilfield group have been studied by the restoration of paleomorphology, analysis of regional structural genesis and structural morphology, and the fracture development characteristics of this area were analyzed. (2) Driven by the seismic ant body, through a series of processing technologies such as model resampling, normalization, P32 fracture density conversion, seismic gap zone simulation and completion, and based on the interpretation of fracture parameters of resistivity imaging logging during drilling, combined with the study of the evolution of regional tectonic stress fields, fracture formation mechanism analysis, the fracture parameters of the northern area have been comprehensively studied and determined, the three-dimensional fracture network model of the fracture development area is established. (3) The numerical simulation model of the dual-porosity reservoir of the northern area of the F oilfield is established. The horizontal well layout orientation, injection-production well type, injection layer, well pattern density and injection timing in the northern area are optimized by using reservoir engineering method and reservoir numerical simulation technology. The well trajectories of horizontal wells were finely optimized by applying ant body fracture prediction techniques. Through the research, an important change in the understanding of reservoir type from extra-low permeability pore type to fracture-pore type reservoir was completed. Through optimization research, a specific optimization plan for the injection production well pattern in this region has been proposed and significant results have been achieved, with certain practical and promotional value. By the end of 2022, five high-producing wells have been put into production in the region, with an average production of more than 3000bbl/d, the peak daily production is expected to increase by 40% and the recovery rate is expected to increase by 3.65%.