Study On The Structural Interpretation Of The Complex Fault Block Of Jin 27 In Longhu Oilfield

The study area is located in the three dimensional seismic industrial area of Jin 27 oilfield in Songliao basin,the Saertu reservoir is fluvial,Delta and shallow lacustrine sediments,the thickness of sedimentary strata is thin,and the sand shale thin interbed is developed,which is controlled by faults,structure and lithology.The reservoir physical property is different,the contradiction between layers is prominent,the distribution of sand body in different blocks is different,the block structure is complex,and the horizontal well development effect is better than that of the vertical well.Therefore,in order to improve the effect of horizontal well drilling and reduce drilling risk and workload,it is necessary to explain the complex structure of the block.At present,the structural interpretation method,which is often used,is affected by the resolution of seismic data,and the interpretation accuracy of complex fault block structure can not meet the needs of practical production.Therefore,it is necessary to study the fine interpretation of complex fault structures.According to the purpose of the study,this paper consists of 4 parts.The first part of this paper is to study the geological location,tectonic location,stratigraphic characteristics and sedimentary facies characteristics of a block;The second part: according to the deviation data block,clear the main factors influencing the slope structural correction error,combined with Landmark,DoubleFox software,correction method of comparing several deviation data,select the best deviation data correction method;In the third part,by using the method of combination of well and seismic,the 3D fine interpretation of the block structure is realized,and the structural features of the fault and the top surface of the small layer are obtained;The fourth part: application and market prospect.Based on the study,a fine interpretation of the structure of a block is established.It is important to fully understand the structural characteristics of the block to study the formation of oil and gas reservoirs,the distribution of remaining oil and the distribution of oil and water;It provides technical support for the structural interpretation of the block,horizontal well drilling,block structure mapping and so on;It also provides geological reference in order to reduce the risk of drilling,reduce the workload of drilling adjustment and improve the drilling effect of horizontal well;A fine interpretation method of complex fault blocks is formed,which can be used as a reference for fine interpretation of other oil fields.