Detailed Description Of Reservoir Of Es₃^s Of Fault Block Wen 33 In Dongpu Depression

The reservoir of the upper member of the Shahejie Formation in Wen 33 Block of the study area is located in the southern part of the Wenliu structure in the central uplift of Dongpu depression.It is a fault block oil and gas reservoir distributed like a stripe,which lies on the northwestern part of the Wennan graben.After more than 30 years of water injection development,the upper member of the Shahejie Formation in Wen 33 block has reached the late period of oilfields with high recovery,high water cut and high residual recovery speed.At the same time,due to serious damage of the well and the complexity of the structure,the water drive producing degree is low.This thesis is based on petroleum geology,sedimentary petrology,structural geology,etc..By fully taking the latest theoretical and technical methods,making full use of geological,logging and testing data and production dynamics of the oilfield,detailed reservoir description of the study area is completed.The main work includes:1.Establish a standard division and contrast scheme with the original members subdivided,fine stratigraphic correlation to single sand body level based on the elaboration of the interlayers,and re-determine the standard of stratigraphic correlation.2.Interprete the stratigraphic correlation results and 3D seismic data of 144 wells in the research area,and make interpretation trace by trace in locally complex area to rearrange the syntagmatic relation of each fault.Using the historical water seeing relationship data,stratigraphic dip logging and formation pressure test data to determine the attitude of the faults in low ordinal and re-depict the structure in research area.3.Based on previous studies,core observation,sedimentary background along with sedimentary characteristics,we have drawn a conclusion that the study area is a delta deposit controlled by the shallow lake-semi-deep lake sedimentary system,and the delta front is its main reservoir.We also used the core and logging data to re-established the reservoir interpretation model,and make the elaboration of the heterogeneity of the reservoir.4.Through the qualitative and quantitative description of the remaining oil,the distribution feature of remaining oil is found,and the next step is formulated.