Research On Reservoir Evaluation And Its Control On Distribution Of Oil Reservoirs Of Putaohua Oil Layer In Taidong Area Of Songliao Basin

Since 90 s because of the positive structures are to be favorable for oil and gas drilling,the difficulty of the new structure is more and more bigger,but because of lack of geological research,the geological features,the relationship of oil-gas-water and reservoir types and distribution in the area of Taidong has not yet been clarified,the exploration into slow development,it is difficult to open a new situation.In order to solve this series of problems,the Putaohua reservoir and its reservoir control are studied in this paper.First establish k2y1 stratigraphic framework and application principle and method of high resolution sequence stratigraphy,the sequence stratigraphic classification and correlation,that the k2y1 bottom unconformity and k2y1 section he k2y2+3 section of the class I sequence interface.During the k2y1,the mudstone layers with regional correlation are of the type II sequence boundary.With the boundary of three recognized sequence boundaries as the boundary,the lowstand system tract(I)and the lake basin extension system(II)are identified according to the elevation principle of the sedimentary datum.According to the widely developed mudstone layer as the internal subdivision marker,the Putaohua oil layer in the eastern region is divided into seven quasi sequences.Based on the stratigraphic division,make full use of seismic,drilling and the data of logging,the sedimentary environment of the low water level and lake expanding system tract were analyzed,identifying the reservoir of Putaohua in the area of Taidong mainly developed delta front subfacies,including underwater distributary channel,mouth bar,distal bar and sheet sand microfacies;The sedimentary microfacies of the study area were studied by the method of point line surface study.The results show that the study area is a typical "retrograde" sedimentary plane mainly developed North provenance and Western provenance,seven parasequence bottom-up,channel deposits gradually atrophic,one para-sequence large area of the lake sediments.Then,on the basis of macroscopic and microscopic development characteristics and effective physical properties of reservoir,the fine anatomy of reservoir is carried out by using drilling,logging,oil testing and seismic data.The results show that there are three oil and gas accumulation zones and each hydrocarbon accumulation zone in the eastern region.Because of the sedimentary facies zone,the characteristics of the fracture and the property of the reservoir,there are different the types of reservoir and the distribution patterns of oil and water.The western slopes of oil and gas accumulation zone for lithologic structural reservoir,Songfangtun nose structure of oil and gas accumulation zone as the block under the control of the fault lithologic reservoir;Yongle syncline hydrocarbon accumulation zone lithology is the main controlling factors of reservoir forming,the reservoir belongs to lithologic reservoir.Finally,based on the study of reservoir development characteristics and distribution law of oil and water,the control role of reservoir on oil and gas distribution is studied,The results show that the control effect of Putaohua reservoir on oil and gas distribution is mainly reflected in two aspects: First aspect,sedimentary facies control the distribution of oil and gas,the distributary channel sandstone thickness in the delta front of the large,oily,single well productivity is high;Second aspects,reservoir controls the oil and gas production capacity,the total capacity of reservoir porosity in the oil and gas reservoir permeability was higher.The greater the higher the capacity of oil and gas wells.