The Forecast Of Fracture Of Dongshengpu Buried Hill In Liaohe Oilfield

Fracture of buried hill metamorphic reservoir of Dongshengpu in Liaohe oilfield was developed and characterized by high heterogeneity.Poor development performance was caused by water channeling and coning during post development period.Seismology,wire line logs and integrated reservoir analysis technics were used to research reservoir description,and established solid geologic foundation for secondary development.Fracture distribution was studied by using the refection seismology and geological factors based on the core descriptions.The first one was based on effective identification of fractures on single wells,integrating logs and calibrating seismic data to calibrate fracture.The bedrock fractures were predicted by correlation between seismic attributes and fractures.The second one was based on geologic body strain under stress field.Development characteristics were achieved from the paleostress field simulation and rock rupture theory.The following are the main results from this study:(1)Core observation shows that buried hill reservoir are composed of two sets of high-angle oblique cross cutting fractures,among them NE-NNE fracture which is consistent with the structural trend is most developed.NE-NNE fracture opening is generally between 0.01 and 0.1mm and the average spacing is about 2cm,and it is locally filled with calcite and quartz.The fracture distribution is closely related to reservoir lithology.(2)Geologic origin method forecast shows that the top of buried hill mainly developed 2 sets of conjugate fissures,\EW and NE-NW.Fracture distribution is closely related to tectonic position.Fractures were most developed on the buried hill tops of greater curvature while less developed fractures occurred on places of edge low position or slow inclination.(3)Energy attributes can be well reflected fracture in three dimensional space distribution.Fractures were mainly developed at the high part of the structure and nearby the fracture belts,the most development zone is from the top surface of the buried hill about 50-300m.(4)Fracture forecast results combine with exploration and development characteristics,deploying 11 oil and water well measurements and 4 new wells.