Fractures Effectiveness Evaluation In Dense Sandstone Reservoir And Exploitation Recommendation

Extra low porosity and permeability reservoirs in Ordos Basin generally do not have edge and bottom water, also lack of nature energy, are typical lithologic-structural reservoirs. HongHe oil field,located in the southwest of Ordos Basin, southern tip of Tianhuan depression, its Chang 8 formation reservoir is a typical low-abundant of oil and gas, extra poor porosity and permeability reservoir,with strong heterogeneity both in vertical and horizontal direction.The exploration work for oil and gas has begun since 1997, only found a lot of oil and gas shows in Chang 8 formation until 2006, but did not get commercial oil and gas flow. Some of the old wells get high yield due to the re-fracture work in2007.After a period of time, the problem that lacking of natural energy had been exposed. Oil production fell too fast and water-content rising too fast, the new drilled well didn't get high yield. In order to solve the shortage of natural energy, felling too fast of production problem for some oilfield-block, water injection technology was used, but the effection was disappointed. Some well group quickly flooded after water injection, leading to the rapid drop of oil production, while some wells seems not affected.In the case of production increasingly decline. For the region's low porosity and low permeability and heterogeneity uneven characteristics, proposed development of natural fractures in the region should be the impact of the uneven distribution of production of important reasons. In order to solve practical production problems, get a higher oil yield and a better production efficiency, this article draw a conclusion from the outcrop observation, core measurement, combining previous log analysis and other information, analyzed the types and characteristic and so on of fractures,proposed the factors that control crack formation and development; and discussed elements that affect the effectiveness of the cracks, and predicted the fracture zones where more fractures may exist by summarized these study above. Crack research and development of oilfield production will then get combined, detailed analysis of the role of fracture in oil and gas accumulation, oil production, water injection, the impact of fracture stimulation and other aspects of the production and development.Finally, according to the results of the previous study, the oilfield injection patterns deployment recommendations, and divided the three developers hope to predict favorable area for oil production and development help.