Method for Improving Coincidence Rate of Watered-out Reservoir Interpretation in Gangxi Block of Dagang Oilfield
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By taking Gangxi Block of Dagang Oilfield as an object of study, a quantitative interpretation model suitable to watered-out reservoir interpretation in the block is established, which combines conventional logging, induced polarization potential logging with complex resistivity logging on the basis of comprehensively analyzing the data of its geology, well logging, logs and formation testing. It is used for data processing for 24 wells with coincidence rate of 81.6%.Cite
The J2x oil reservoir of Niujuanhu Oilfield has such characteristics as complex lithology,bad physical property and the aeolotropism.According to these characteristics,this paper makes full use of lots of datum of core analysis,well test,production test and development,establishes the suitable well logging interpretation model of the reservoir parameters for this area.
Lithology
Petroleum reservoir
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Accurate interpretation to Lianhua reservoir of Lei11 block is conducted based on core analysis and well logging data by means of logging model interpretation.The conclusion shows that regular oil and water distribution is found from top to the bottom of this reservoir.Sha3 section has a certain developing potential.High deliverability may be obtained at Sha4 section for its high resistivity difference of reservoir fractures.This standard settles a basic technical foundation for reservoir interpretation of this block.
Section (typography)
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With Block Yangerzhuang in Dagang Oilfield as an object of study,a quantitative interpreting model for water-out reservoir interpretation of the block is established by using the relative resistirity method on the basis of integral analysis of geologic,logging, well-testing and formation testing data. The model is used to process the data from 5 wells with coincidence rate of 82. 9%.
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In consideration of the limitations in hydrocarbon interpretation of fractured reservoirs by using logging data,by taking Well B in Bohai Oilfield for example,a data acquisition combination,such as common logging,STAR II,XMAC II and production logging during open-hole test was used for qualitative description and quantitative computation for granite reservoir space,by using the data of added production logging,the fluid property in the reservoir space dividing by integrated interpretation was recognized,the zoning production output was quantitatively calculated.The result demonstrates that the method is feasible for granite reservoir interpretation.
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By using the litho-physical software package (P-package) of Schlumberger Corperation, logging interpretation in E1 f3 of Minqiao area of Jinhu Depression is studied , of which good geologic results are achieved, the logging technique is fully used to find out and evaluate oil-water reservoirs, thus feasible techniques are provided for interpreting reservoir parameters and integrally evaluating reservoir logging.
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In Kuqa Area,the reservoir features were low porosity and low permeability and ultra-low porosity and permeability,the reservoir pore-structure was complex with fracture development,it caused great difficulty for evaluation.Through studying the logging interpretation data from Kukebai Gas Well in Kedong Area of Tarim Oilfield and on the basis of analyzing the test data,a physical property(porosity,permeability),and saturation parameter logging interpretation model was established by using core analysis data and reliable logging data from the target zones for analyzing the effectiveness of fractured sandstones and drawing well logging interpretation charts of oil and gas reservoir in Tarim Oilfield,by which the ability of logging identification was improved.The result of the study has great significance and adaptability in oilfield operation.
Tarim basin
Saturation (graph theory)
Adaptability
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MPR multi-parameter propagation resistivity LWD logging and CNL compensated neutron logging in cased hole are widely used in horizontal well logging in Dagang oilfield.Based on comparison between the MPR LWD data and dual induction-focused logging(DIFL) wireline data,and integrated with realities of Dagang oilfield,concluded is that the dominant influence factors of MPR are formation anisotropy and tool eccentricity,then developed is a new set of synthetic evaluation technologies of horizontal well,such as deviated hole convolution and logging data optimum combination to eliminate effects of shoulder bed and tool eccentricity,3D reservoir correlation technology to describe reservoir configuration and evaluate fluid property.The technologies are effective in practice.
Wireline
Formation evaluation
Eccentricity (behavior)
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In terms of the difficulty of logging evaluation during developing the metamorphic buried-hill reservoir in JZ-S oilfield,a new method of logging evaluation has been developed for the reservoir based on the method during its exploration.In addition,the technique series of logging evaluation is improved further for the buried-hill reservoir,by implementing some new ideas,such as making a quantitative fracture description by equivalent fracture density(EFD) and estimating the reservoir productivity by a combination of fractured reservoir index(FRI) with the logging curve profile,which has provided an important support for the logging evaluation during developing this oilfield.
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NMR logging can provide abundant stratigraphical information such as porosity,porosity distribution,mud bound water volume,capillary bound water volume,free fluid volume and permeability.Through the study of the data processing method of MRIL_Prime,the authors establish a data software of MRIL_Prime to process the practical data of Daqing oilfiled and to interpret the well logging data,combined with the corresponding conventional logging data.The results show that the application of NMR logging data can enhance the reliability of the evaluation on the reservoir liquid property and modify some interpretation mistakes in complex reservoir evaluation by conventional logging in Daqing oilfield.
Formation evaluation
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According to the actual situation of long-term salt mud drilling in the beach area of Dagang oilfield,the characteristics of salt mud invaded low resistivity reservoirs are summarized through the experimental simulation and resistivity logging data contrast.Lower reservoir resistivity is closely related with mud invasion time and reservoir properties.On the basis of above study,three kinds of suitable logging methods for the special low resistivity reservoirs are synthetically analyzed.The result shows that the punctual logging is the best way to avoid drilling fluid invasion influence.The time lapse logging method is suitable to the reservoir which is not soaked for a long time by the drilling fluid.The above two methods all need to design the reasonable logging time.For the mud polluted reservoir,NMR log is quite good to identify the reservoir fluid properties.
Mud logging
Logging while drilling
Formation water
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