The Realesearch Of Argillaceous Siltstone Improving Exploitment For Thin Narrow Sand Body Oil Field

Pu-I layers of Putaohua oil field are the part of the Songliao Basin, in which the northern large rivers -delta depositional system extend towards south. The results of the fine geological and residual oil research on narrow sand body oil underwater show that: the type of oil field is narrow sand body, poor continuity, scattered distribution, the mean rate of drilling of each small layer of sandstone and net pay thickness are 30.11% and 18.99% separately. Under the condition of the existing well pattern, the degree of controlling over the sand body is low, which increases difficulty for comprehensive potential adjustment in the future.Therefore, on the base of the geological characteristics is that a great deal of argillaceous siltstone existing over the intermittent sand bodies. Advanced the idea that taking advantage of the great number of argillaceous siltstone existing over the intermittent sand bodies to improve the state of connectivity between sand bodies, research on the comprehensive utilization of argillaceous siltstone. In this paper, narrow underwater distributary channel sand body deposition is primarily depositional mode for Putaohua oil field, which is narrow sand body, poor continuity, scattered distribution and a great deal of argillaceous siltstone existing over the intermittent sand bodies. On the base of fine geological research, according to the known produced fluid,injectivity,physical properties and the results of statistical analysis of argillaceous siltstone, establish the electrical explain standard of argillaceous siltstone. Applicate the standard perforating in the extension well in the oil field and reperforating in the argillaceous siltstone layer of new zoned old well, which attain a good water injection and oil-producing effects, further improve the relationship between injection and production for single sandbody, and provide new ways for exploiting residual oil.According to the result of the study: the method of improving the effect of oil field development by utilizing argillaceous siltstone, which can be applied to other similar geological conditional oil fields of Daqing oil field, can effectively improve the effect of oil field exploitment, generates considerable economic benefits, has a broad applicability and popularity.