Geological Characteristics Of The Es3x Of Block Lin 13,linpan Oil Field

Located in the west of central uplift of Huimin sag,Lin 13 area is one of the main bock in Linpan oilfield,which is chraracterized by complex oil-water relation,serious interlayer interference in the longitudinal direction, poor well pattern adaptability and worse development effect.Aiming at the problems of serious interlayer interference and hard to be recognized for distribution of residual oil during oilfield development in Fault Block Lin 41-43 in the lower part of Es3 x of Lin 13,geological research,based on stratigraphic division and correlation,is carried out with structure,reservoir,3D geological model and numerical simulation at the core. The main conclusions are as followed:Guided by theories of sedimentology, the study layers are divided into three sand sets and thirty small layers with the method of cyclic correlation and graduation control. The sand body is characterized by multiple superposition,stable distribution on the whole,scattered distribution for partial layers and getting thinner gradually from west to east.The sedimentary microfacies are mainly underwater distributary channel and mouth bar of Delta front. The structure maturity of sandstone changes from Low to medium. Detrital grains mainly show line- point contact. The main cementation type is pore cementation. The size classification of the sandstone, with relatively coarse grain size, is medium. On the contrary,the thin sandstone with relatively fine grain size is poorly sorted.From the plane of view,remaining oil distribution of the Fault Block Lin41-43 is mainly controlled by tectonic. Remaining oil is rich in the structural high position including Lin41-438 well areas and the area of faulting shelter such as Lin41-X260 well area. Vertically,main layers including 15,18 and 210 occur serious water out and relatively low residual oil saturation. Non main layers including 13,16,32 are characterized by relatively poor physicalproperties and high oil saturation.Comprehensively analyzing and evaluating the heterogeneity of interlayer, plane and microcosmic level in the reservoir,the average porosity is 19.6%,the average permeability is97.7×10-3μm2, the permeability ratio is 7.6, coefficient of variability is 0.41 and the heterogeneity coefficient of permeability is 1.9. Therefor, the reservoir heterogeneity is relatively strong. Petrel is applied to build three-dimensional geological modeling of structure,reservoir and fluid as well.Based on the study of reservoir classification and evaluation and technical and economical limits,the development adjust plan,which is that the Fault Block Lin 41-43 were divided into three well network,is put forward according to the principle of subdivision and regroup of layer series and vector well pattern.