| Zhangqiang depression is a Mesozoic depression in the outer basin of liaohe river.In 2006,the three wells were successfully implemented in the next section of the shahai group,all of which obtained industrial oil flow and opened up the new situation of exploration.In 2008,the proved oil geology reserves were 1631×104t and the oil area was 11.3km2.In 2010,the block was developed in a "synchronous waterflooding" approach.Block nissan oil is stable at 150 tons.In recent years,the area is confronted with the main contradiction of the three aspects of the economic development,which is difficult to realize economically and effectively.In new increased difficulties of proven reserves,and development costs increased year by year,under the background of the premise of oil properties become worse year by year,by the fine description of reservoir and the exploration of horizontal well fracturing volume model to realize effective use of proven reserves,development has important significance for the piece of stable yield,benefit.In view of that above problem,the research on the fine description of the quality of the low permeability reservoir in the south of zhangqiang depression is studied,and the structure,sedimentation and reservoir characteristic of the low permeability reservoir in the south of zhangqiang depression are comprehensively evaluated by drilling core data,core analysis,analytical data,development of dynamic data,logging,logging,geophysical and other basic information,and the optimal selection of the design of horizontal well optimization and the scheme of rolling exploration for the low-permeability reservoir in this area is based on this basis.The following points are summarized through the research:(1)The overall structural form of the study area is a single oblique with a low north height,and the internal fault is relatively developed,and the main faults move toward the north east and the north west,and the internal multiple minor faults complicate the structure.(2)The sedimentary type of this area is the leading edge sedimentation of fan delta,which is divided into four microfacies of underwater distributary channel,underwater distributary channel,estuarine dam,and sheet sand.The main line of the underwater distributary channel is large in sand body,and the sand body is thin,and the lithology is thin and the material is poor.(3)The reservoir types in this area are lithologic reservoirs,and the plane distribution is wide and the vertical oil layer is thick.The reservoir in shahai formation is mainly controlled by lithology,and the lithology and physical boundary control reservoir scale.According to the four sexual relations of oil reservoirs,the standard of effective thickness of oil layer was established by re-understanding the physical and electrical limits of oil,and the calculation of the total reserves was 630.88 million tons.(4)On the basis of clear development method,the development plan of fracturing of horizontal well is studied.The results show that the horizontal well should be kept in a certain Angle with the maximum principal stress direction,and the length is controlled at about 600 m,and the deployment site should be in the middle of the reservoir,so as to maximize the advantages of fracturing of horizontal Wells.In addition,five point method and straight horizontal combination of staggered pattern are used to synchronously water injection,so as to ensure the steady production of horizontal well and improve the degree of recovery and economic benefit.This paper presents the prominent problems in the development of low permeability reservoirs in the south of zhangqiang sag.Through the detailed description and optimization of the geological geological geological bodies in the reservoir,the effective use of low-permeability reservoirs in this block is realized,and the development model of low permeability reservoirs is changed,which provides a technical reference for the effective development of low-permeability reservoirs in the peripheral basin of liaohe oilfield. |
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