Study On Geological Modeling And Numerical Simulation Integration Of Lower Ditch Group Reservoir In L6 Block

Kulongshan reservoir in QX oilfield is a deep complex fractured reservoir which is controlled by foreland thrust belts. The L6block is the richest hydrocarbon accumulation area, located in the center of structural belt, with the characteristics of high original formation pressure, good fluid properties, sufficient elastic energy and high original production. L6block belongs to complicated fractured fault block oil reservoir with the properties of high temperature, high pressure, low porosity and permeability, and complex lithology.The geological features of complex fractured reservoir would cause edge and bottom water breaking through and fingering, which cause great difficulties to control water and stabilize production.For the combination of reservoir geology and development characteristics, the space distribution and attribute model of fracture network was established by discrete fracture network technology based on the reservoir structure, and then a dual porosity3D model was built. Because the uncertainty of the fracture property is big, this paper calculated three fracture NTG modes which reflect the fracture characteristics synthetically by integrating numerical simulation and geology modeling. Geology model was upscaled and the date was imported into numerical model, and the effect of three NTG model on exploitation dynamic was compared. Then the appropriate fracture properties were determined and the lower limiting value of porosity is0.1%. The dual porosity numerical model was built preliminarily.On the basis of numerical model, production history matching was completed by adding water body, segmenting and integrates research. The main remaining oil-rich regions were found that concentrated in the vicinity of faults, poor sand body and weak completeness area of well network. Based on the distribution of remaining oil that reservoir simulation obtained,9development plans considering reperforation, water extracting, well pattern thickening and comprehensive adjustment were designed and then production effect was forecasted by these plans. From the forecasting effect, the main measures of improving recovery were reperforation and water extracting. This study provides technical support and suggestions for late stable production and water control of this kind of fractured reservoirs.