Research On Sedimentary System, Reservoir Characteristics For Es-3 Lian Hua Reservoir In Qi108 Section,Liao He Oil Field Western Depression

Liao he western depression is the typical down slope oil-gas accumulation zone. As the chief exploration area of Liao he oilfield, Liao he western depression has a great petroleum geologic potential. As preliminary studies lack the understanding of the geological conditions in this area, this area of exploration would be adversely affected. In order to keep production, according to the complex tectonic conditions, high reservoir heterogeneity degree, fast phase change of this area, Strengthening the sedimentary facies and reservoir characteristics of micro-studies, is the guide and important basis for the next step and prerequisite of oil and gas exploration in the area.This thesis is based on sedimentology and reservoir sedimentary, logging geology, making full use of the study area well drilling data, drill core data, bore log data,test analysis data, carrying out a systematic stratigraphic division and correlation in the study area of Lian hua reservoir. By analyzing sedimentary characteristics, rock electricity characteristics,deeply studied the sedimentary system type and characteristics in Qi108 Lianhua oil group, at the same time established the corresponding facies model,carrying out a systematic study on sedimentary facies and reservoir characteristics. At the same time, detailedly discussed genetic types and distribution characteristics of reservoir sand. Then attain a more in-depth understanding.Research shows: Lianhua reservoir group in the study area belongs to fan-delta depositional system, and developing fan delta front subfacies underwater distributary channel, the mouth bar, front thin sand microfacies. In various sedimentary microfacies fan-delta front underwater distributary channel and mouth bar has the characters of pore throat big, good reservoir properties, pore structure type of combination to high permeability, the main characters are megaporosity, medium - wide throat, which belongs to a good reservoir, while front sheet sand and segregation between the thin reservoir sand is a poor, sandy mud between the diversion of non-reservoir rock.The reservoir physical property of underwater distributary channel and mouthbar sands in delta front is better in all kinds of sedimentary micro-facies, that of distal bar and shallow lake sand bars is poor, in all kinds of lithology, The reservoir physicalproperty of fine sandstone is better, that of siltstones is poor, and fine sandstone is the main reservoir lithologic types in the studied area.Development of sand bodies are controlled by sedimentary facies, showing a NW-SE fan-shaped cloth. By studying the petrological character, physical property character, pore structure types. the study area Lian hua reservoir Characteristics of reservoir has been studied,the result identifies that Lian hua reservoir group in the study area has low compositional maturity and low textural maturity characters. The main rock type is lithic arkose. Reservoir performance is controlled by sedimentary facies and diagenetic clearly, the underwater distributary channel sand reservoir is the best one. According to physical parameters and pore structure characteristics of the study area, Lian hua oil Formation sandstone reservoir is divided into five categories: classâ… is a better reservoir, classâ…¡,â…¢,â…£o f poor reservoir. The final study is group of each reservoir reservoir sand body distribution rule, with the purpose of providing an important basis for the further oil exploration and deployment in the area.