The Study Of Drilling Plan Based On The Reservoir Characteristics In Shengping Oilfield

Shengping oilfield is located in the extend position of Shengping nosestructure of Sanzhao depression stretch southward in Songliao basin ,itbelongs to "three low" resevior and experienced oilfield discovery phase, theevaluation phase,rolling development stage.Shengping oilfield reservoir is poor,small, fragmented, it is a variablecomplex oil deposit result from micro-struction, fault,lithology,whichcaused water distribution complex, the initial drilling success rate was lower,which bring about greater development of the oil field drilling difficulties.Todeepen the realization for the struction and development pattern once againand to get the better drilling results,we made the following major geologicalfeatures research. (1) The refined interpretation of structure and faultWe have interpreted three-dimensional seismic data finely , searched formicro-structure and favourable reservoir.The original three-dimensionalseismic data acquisition is aimed at addressing the deep.To improve theresolution of seismic data,we process the target of putaohua reservoir byusing application of three-dimensional seismic data and interpret data throughthe 3D interpretation technology,the core of which is tracking with layerautomatically and interpreting three-dimensional seismic data on the basisof an integrated inclination plan,time difference plan, the time section alongthe floor,plane section and vertical seismic profiles,the final constructionplan is mapped into a 5m contour,making micro-struction clear.We analyse regional tectonic causes by interpreting structure and faultsfinely and restoring the ancient tectonic modeling.The result is faults controltrapping apparently,structure grows with fault, the main type of trapping isfault block.Compared with the original three-dimensional interpretation of the results,the current interpretation use three-dimensional interpretation, and 3Dvisualization, so that faults in the relationship between portfolio and cuttingmethods are different, more accurate explanation, consistent with the regionalstress background, increased in the number of micro-structure , structuredetails clearly, combining micro-structure with facies is important forstudying oil-water distribution rule, which has become an importantcomponent of the refined oil deposit described, now trapping area hasincreased.(2) Lithology prediction methodsApplication layer neural network technology in the same time windowextracts earthquake parameters and train network in the effective thickness ofsamples ,this makes earthquake parameters combination with samplesfully ,then forecast the whole area;application layer sliding along thewindow forecast lithology using known features of the effective thicknesswells,Its advantage lies in drawing parameters along the purpose in a slidingwindow,such reservations reflected on the target layer effective seismicinformation,and give information to reduce the interference factors,therebyensuring the credibility and effectiveness of earthquake parameters. Afteranalysis,when the use of sliding along the floor window earthquake predictlithology, the rate reaches 83%,thus meets oilfield development needs;Jason Mapping software is applicated for setting up reservoir geology modeland is considered structure and sediment model space changes. Invermodemethods provide a basis for optimizing blocks and the design optimizationwells;Voxelgeo 3D visualization software improve forecast accuracy andvisualization variable extent;Stratimagic seismic facies interpretationprovided a better explanation of the geological information for complexlithology reservoir.These applications greatly enhance reservoir forecastaccuracy.(3) Applied refinely reservoir describing technology study refinelysediment characteristicsWe study the sediment environment and well logs sub-facies model,subdivide sediment facies, outlined facies map ,study the water distributionrule.The researches indicate that the oil-water is primarily distributed as thatoil is higher than water in Shengping oil field. The oil-water distribution isbasically according to the gravity differentiation in perpendicular, the upsideis pure oil, middle with oil and water, and the lower is water. It is influencedby such factors as structure, faults, lithological characters, so there is nouniform oil-water interface in the entire area. In different fault blocks, theoil-water interface changes with the different burying depths of fault blocks,and in the identical fault block, the oil-water interface is inclined because ofthe different burying depths and the influences of reservoir anisotropism.According to the fine explanation of structures and faults and thelithological forecast in Shengping oil field, the understanding of the reservoirhas been deepened.With the researches in sedimentary facies, theadvantageous position contained oil has been optimized, and the oil provinceof 8.4 Km2 has been submitted with petroleum geologic reserves of 254×104tand optimal well placement of 114 wells.Shengping oilfield's drilling success ratio is from less than 80% initiallyto the current 98% by means of finely interpreting seismic data andcombining seismic-geology comprehensive analysis methods.The practicehas shown that the lithlogy and water distribution complex fields needconnect the exploration with development,understand the complex oilfieldgeology in the rolling development.That is reference significance for Daqingoilfield to drilling for oil development.