Reservoir Architecture Of Lacustrine Delta Front In SZ36-1 Oil Field

SZ 36-1 oil field found in 1987 is located in the bay of Liaohe depression based on low central bulge in Bohai Bay Basin,which is a fractured anticlinal oil and gas reservoirs.After 30 years of development,the oil field entered the stage of high water cut as a whole,and the comprehensive water cut up to75%.Reservoir vertical and plane injection-production imbalance led to the development of contradictions increasingly and fundamental reason is that the original geological understanding can not meet the needs of the further development.This study will therefore analyze the configuration of finer classification for this area of delta front reservoirs to improve well pattern and adjust the development to provide the reference in the future.The thesis conducted the research on Dongying formation? oil group withrich logging data.Based on the core,logging and dynamic data,the reservoir configuration of the research area was dissected by means of sedimentological method and stratigraphic stratigraphy.Through the analysis of lithology,sedimentary structure and well logging data it can be concluded that the study area in the western ancient Suizhong drainage sedimentary pattern is braided river delta deposit,and the study area in eastern ancient Fuzhou drainage sedimentary pattern is meandering river delta deposits.Under the guidance of depositional model,the ?oil group of configuration unit of study area is divided and correlated.It is divided into 6 configuration units,and the main research objectsare the level 3 and level 4 configuration unit.The level 3 configuration unit is sedimentary microfacies sandbody,while the level 4 configuration unit is hyperplasia of internal body microfacies sand bodies.On the basis of the division of configuration units,this paper analyzes on level 3 configuration unit types,and describes the contact relationship of different level 3 configuration unit,section and plane distribution mode.In the research district,the mouth bar research area A-C was selected.The study dissects the river mouth bar configuration unit as three main factors such as configuration interface,hyperplasia and argillaceous interlayer,and depicts the configuration elements on profile and the distribution of the contact relationship of 4th level configuration unit.