The Research Of The Reservoir Distribution In Zhou Ji Oilfield Qian3~2?Qian4~1 Oil Group

Reservoir distribution technology plays an important role in the exploration of oil and gas resources.In the course of the development of petroleum industry in China,with the progress of the seismic data acquisition processing and interpretation,the fine structure interpretation technology will have wider application space.The 3D fine seismic interpretation technique is the key part of this study.Prediction of Reservoir distribution is on the basis of basic characteristics of reservoir and by geological model forward and the seismic attributes analysis technology launch forecasting reservoir property lithology and petroleum potential.So study on the distribution rule of reservoir is important technology which is beneficial to awareness and evaluation of reservoir and guiding oilfield development.After collating and assimilating predecessors' research,we completed 3D fine structure interpretation of seismic data in structure area.In this study,we used the techniques of horizontal slice interpretation,coherent volume analysis,seismic attribute analysis and geological model forward to clarify the disposition of fault and fault block structures.After all of this study,we provided the reliable base data to research structural characteristic and exploration target prediction.The research results are as follows:(1)Carry out the fine structure interpretation area into 2 aim layers,and complete this regional structure in Figure 2 aim layers;implement structural traps 9 with total area of about 12.397 square kilometers.Brokeback main types of traps include broken nose and fault block,favorable structural traps are described in detail;(2)Based on the velocity analysis,the comprehensive average velocity of the pilot wells in the Zhou Fan area was determined;(3)According to the petrophysical statistical analysis,the petrophysical parameters of different rocks were identified(acoustic velocity ? density and wave impedance)with the depth of the law of change.The relationship of acoustic velocity is: V oil sand? V water sand? V mudstone? V dry sand;The relationship of density is: ? oil sand? ? water sand?? dry sand? ? mudstone;(4)The seismic reflection characteristics and seismic resolution of different lithologicinterfaces at the target interval are determined by model forward modeling.(1)Since the impedance of the salt layer is the smallest the wave impedance of the mudstone is large,seismic reflections form strong in-phase axes on the profile.(2)In the sand-shale interval,the difference of wave impedance between thick sandstone bottom and mudstone top is bigger,a strong reflection of the same axis.The reflection interface between the thin sandstone and the mudstone is an integrated response,and the in-phase reflection is weak.(3)With the increase of permeability sandstone,the sandstone in the salt rhythm layer or the sandstone adjacent to the overlying salt rock mainly manifested as the attenuation of the bottom reflection wave amplitude;As the permeability of sandstone and rock salt wave impedance roughly the same,and sandstone is mudstone transition salt rock,thin-bedded sandstones in the salt rhythm layer are difficult to identify on seismic sections and should be analyzed on the basis of geological settings;(5)Based on geological and geophysical data,the Zhou30 well area qian41 oil groups is divided into(1)?(2)?(3)?(4)?(5)five small layers and ????? three oil groups,and each layer and oil group can be compared in the whole well area.(1)?(2)two small strata are mainly delta siltstone and mudstone;The(4)layer is mainly composed of mud-salt beach sediments;The delta layer is the main layer in the(5)layer.The Zhou16 well area qian32 oil groups is divided into(1)?(2)?(3)three small layers and ????? three oil groups.The(1)layer consists mainly of deltaic sediments and mudstone deposits;The(2)and(3)layers are mainly deltaic and lacustrine sediments;(6)Based on drilling lithology,electrical measurement curve and core data,combined with structural and sequence analysis results,during the depositional period,the Zhou30 well area qian41 oil groups and the Zhou16 well area qian32 oil groups,the sedimentary facies such as delta,mud-salt-beach,brackish-lake.The sedimentary center is dominated by salt rock deposits,and gradually transition to gypsum and mudstone deposition,which is typical salt lake sedimentary sequence.In the area near the main fault,delta deposit is formed,and the delta front facies subfacies is developed in the vicinity of the disk;(7)The reservoirs of the main target layer are predicted by seismic mult-attribute ananlysis and seismic facies ananlysis,and combining the sedimentary facies with the drilled straturn data to predict planar distribution of sand bodies of the Zhou30 well areaqian41 oil groups and the Zhou16 well area qian32 oil groups.