The Study On The Geological Characteristics Of Leijia Lianhua Reservoir

The Leijia area is located on the Shuguang-Leijia slope in the "western depression area" of the Liaohe Basin.The area is characterized by complex structures,developed internal faults,broken structures and rapid lithologic changes.It is a low resistivity reservoir in complex fault-block reservoir.After subdividing sedimentary microfacies,it is found that there are still some uncontrolled single sand bodies in the oil reservoir which has been thought to be controlled by well pattern in the past.In view of these,the geological understanding of this paper has been carried out.In this paper,the Lejialianhua reservoir is taken as the main research object,the regional geological understanding is taken as the guide,the stratigraphic characteristics and sedimentary environment of the area are analyzed preliminarily,and the seismic data interpretation research is carried out.Firstly,according to the principle of seismic sequence division,the isochronous sequence stratigraphic framework is established,as well as the variable velocity mapping are studied.It is summarized that the top boundary of sand formation of Lianhua main oil reservoir in the study area has the structural characteristics of step by step from north to south,which is low from north to south,and the strike is near east-west and northeastward,so as to perfect the previous geological understanding.According to the sedimentary environment and lithofacies,the sedimentary system of sublacustrine fan is determined,which can be divided into a series of microfacies,such as front edge of middle fan,channel between channels,braided channel and so on.By analyzing the physical properties of different sand groups and the distribution law of reservoir physical properties,the horizontal distribution characteristics of sand bodies and the main features of pure mudstone are summarized.The type of interbedded rock supplemented by sandy gravel or mudstone intercalated with thin sandstone.In view of the actual reservoir production situation,the characteristics of remaining oil distribution and the main influencing factors are mainly analyzed by dynamic analysis method,and the sedimentary facies of middle and small reservoirs are studied by dynamic analysis method.Combined with the structural characteristics of the study area,so as to make the necessary determination of the condition of the remaining oil.The single sand body which has not been controlled by subdivision of sedimentary microfacies has been studied on the perfection of injection and production of single sand body,which lays a good foundation for further tapping remaining oil and enhancing oil recovery.