Reservoir Description And The Study Of Residual Oil Distribution Law For Middle S3～(6-10) In Block Pu67

Based on the study of Middle S3^6-10 in Block Pu67 reservoir, the reservoir description,reservoir dynamic analysis, reservoir engineering and numerical simulation are integratedlyapplied. According to reservoir characteristics of Middle S3^6-10 in Block Pu67 reservoir,accurate correlation of flow unit, structural interpretation combined with borehole seismicmaterials, sedimentary microfacies analysis, diagenesis of reservoir and fracturecharacteristics, studies of the heterogeneity and sensibility of reservoir, the fine geologicalmodel of oil reservoir are established. Through in-house tests, dynamic analysis andnumerical simulation, the distribution law of residual oil is studied. Major researches of thispaper include:1. The sedimentary microfacies study shows Middle S3^6-10 in Block Pu67 is submarinefan sedimentation. The main sedimentary facies is middle fan front to fan front. Themicrofacies include water channel, shallow channel, sand sheet, slump deposit and deeplake-half deep lake deposit. The main reservoir rock is water channel, then the sand sheet,others are less.2. Diagenesis study shows middle S3^6-10 sand member was experienced compaction,cementation and erosion after deposition. While now displacement recememtation occurredso as to make porous structure weak.3. According to requirements of reservoir development, 27 flow blocks are divided. Inthe 3 kinds of flow blocks that are sorted, there are 9 flow blocks of sort I, 8 of sort II and10 of sort III.4. The accuracy of understanding reservoir structure is obviously improved. So it isclear to determine structure pattern and fault spreading. It is thought that Pu 67 fault playsan important role for controlling the structural development of block Pu 67 and itspetroleum accumulation. There are 5 sub growth faults developed in block Pu 67.5. Study has been done on oil displacement mechanism of low percolation reservoirswith deep layer. The research results indicate flooding rate and injection pressure haveunconspicuous effect on formation of residual oil. The heterogeneity of reservoir poretexture is a major cause of displacement efficiency.6. Combining dynamic analysis and numerical modeling, qualitative analysis andquantitative analysis to study residual oil distribution of the reservoir, the result shows thatplane residual oil distributes around waterflooded area, elastic development area, anduncompleted injection and production area. Some major layer (61.3, 82.3.4 etc) are seriouslywaterflooded , the residual oil distributes scatter.The achievements of this paper have been used in developing the residual oil in MiddleS36-10 in Block Pu67 reservoir. The field implication also proved its reliability, goodapplication, maneuverable measures and economic use. Meanwhile, the research method ofresidual oil distribution and developing techniques of reservoirs with deep layer, lowpercolation are of certain guiding importance for development of the assemble reservoir.