Fine Geological Research Of The Second Member Of Shahejie Formation In He11 Fault Block Area

Since the exploration of He11 block zone in the western part of the central uplift zone in the Dongying depression has embarked on from 1972,a mature stage of high exploration and development has entered after more than 40 years of progressive exploration and development.Although many achievements have been achieved in the early exploration stage,there is still a lack of understanding of the holistic structure patterns,while the micro structures,the low order faults are poorly understood,and the depositional system could only be characterized with relative low accuracy,which results in the poor development of this block area.Taking the 2nd member of the main hydrocarbon producing layer of this block zone as the research object,the detailed and precise stratigraphy correlation,regional structures and low order faults identification,sedimentary facies and reservoir characterization together with barrier study has been carried out based on comprehensive utilization of drilling,logging,seismic and production data,after which a three-dimensional geological model has been established to recalculate the regional reserves.The conclusions are as follow:(1)By using the method of "Marker controls and correlate under multiple levels and cycles",the stratigraphy of Es2 in He11 block zone has been precisely correlated,after which 10 sand groups,78 thin layers has been divided.14 thin layers have been added additionally compared to the previous schemes.(2)Synthetically utilizing of the well logging and seismic data to carry out detailed structure interpretation of study area.The seismic identification and interpretation of low order faults has been realized by the integration of horizontal slice,coherence cube and precise interpretation of seismic section.6 new low order faults and 28 micro-structure highs have been discovered,providing a brand new understanding of the extension of the He11 Fault which dominates the regional structural patterns.(3)Delta-lacustrine is the main sedimentary systems of the 2nd member of Es2 in He11 block zone,which is supplied through multiple provenances.The provenance of Es2 upper member is from the Qingtuozi Uplift and the eastern part of Chenjiazhuang Uplift,while the provenance of Es2 lower member is from the Guangrao Uplift.(4)The reservoir heterogeneity is researched based on the results of reservoir logging evaluation and sedimentary facies study.The 2nd-6th sand groups of the research area mainly develop sand stone of distributary channels with relative good property,which could be categorized to intermediate – intermediate and low permeability reservoir.While the 7th-10 th sand groups mainly develop sandstone of slump and turbidites which could be categorized to low permeability reservoir.(5)On the basis of reservoir geology research,the geological reservoir model of 2nd member of Es2 is established.The regional reserve is recalculated based on the thin layers,after which,the geological basis for further exploration and development of the study area could be provided.