Combination Of Well And Seismic Fine Structure Research For The South Oil Area In The North Saertu Development Area

Saertu Development Area has entered the extra-high water cut stage of development, due to influence of the fault, the proportion of oil wells and water wells in water flooding layers is high,partial well area injection is imperfect, development effect is poor. how to accurately describing faults features provides geological basis for the development and adjustment of extra-high water cut period and is an important means to improve oil recovery. The previous structural interpretation is seismic-based mostly, well-seismic calibration is based mainly on the horizon, which do not combine breakpoint information of well with sesmic very well.This article will fully integrate well and seismic information in structural interpretation, namely use synthetic seismic record to finely calibrating the layer and breakpoint information of wells in seismic profile, combine with the advantages of seismic lateral continuity and well breakpoint information accuracy, and ultimately get combination of well and seismic structural interpretation research results.Specific content is divided into two parts:First, the calibration of seismic horizons and horizon tracking explanation.By investigating all the wells data in the study area, on the basis of the quality of well curves and the location of well point,we can select sparse well, the distribution of which can control structure. Make synthetic seismic record for those wells, achieve time to depth conversion, calibrate each of the geological stratification in seismic reflection axis and on the basis of synthetic seismic record calibration closely explain union well profile, trunk measuring line, contact measuring line and all layer of the region to establish a high-resolution sequence stratigraphy. Second, the fault tracing interpretation and combination of well and seismic structure interpretation. Combing with the spatial distribution of structure, continuously tracked of seismic horizons and carry out closure interpretation of the fault. Well data can provide a lot of fault information, which is more accurate than seismic faults information in the vertical direction,this can improve the accuracy of interpretation of seismic fault space.But the previous seismic faults information has more continuous space than the well breakpoint information,which can be used to verify the accuracy of the well breakpoint information. By using the time-deep relationship of the synthetic seismic record to build three-dimensional time-depth conversion velocity field, we can provide a reliable basis for time domain horizons and fault information to the depth of field conversion. After conversion to depth domain, we can select the test wells to verify the accuracy of interpretation and extract the seismic attributes of the corresponding layers which can reflect the distribution of faults to assist in identifying and validate fault interpretation results, eventually get combination of well and seismic fine structure interpretation results.