Study on geological engineering integration of distributary channel tight sandstone reservoir
Optimizing hydraulic fracturing development methods and well pattern parameters for delta front reservoirs requires an integrated geological engineering approach.Using the Fuyu layer in L block of the southern placanticline,northern Songliao Basin as a study case,a reservoir rock mechanics model was constructed with constraints from a facies-controlled geological model.An in-situ fluid-solid coupling finite element stress simulation method was then used to perform a three-dimensional sim-ulation of the in-situ stress field,based on the geological and rock mechanics models.The simulated in-situ stress values and directions have been verified to be consistent with Kaiser effect data and imaging logging data,respectively.Hydraulic fractu-ring fractures in two wells were subsequently simulated and verified using fracturing construction data and micro-seismic monito-ring data,applying the aforementioned models.Finally,a dual porosity and dual permeability model was developed under the fluid-solid coupling framework,yielding strong results through history fitting.The study quantitatively explored the relationship between vertical well pattern characteristics and the adaptability of regional geological and physical features.The findings indi-cate that under depletion production,a 500 m×150 m well pattern in areas with good reservoir quality yielded 11% higher cu-mulative oil production over 15 a compared to a 300 m×120 m well pattern.In contrast,in areas with poorer reservoir conditions influenced by underwater distributary channels,the 300 m×120 m well pattern produced 8.16% more oil.Under water injection production,the 15 a cumulative oil output of a 500 m×150 m well pattern exceeded that of a 300 m×120 m well pattern by more than 30%,with the advantage being more pronounced in areas with poor reservoir conditions.This study provides theoretical support for optimizing fracturing development in similar tight reservoirs.
tight reservoirgeological engineering integrationthree-dimensional fracturing simulationfinite element stress simulationsedimentary facies
万方数据
维普
