| Structural slope refers to the regional tectonic movement or local tectonic uplift formed in the upper part,lower erosion,burial slope area,which is a kind of important tectonic unit in petroliferous basin,located in the uplift to sag,and is the main sand accumulation zone of large lithologic stratigraphic trap formation.Slope structure refers to the slope area which formed by the regional tectonic movement or the tectonic uplift somewhere.The upper of it is given priority to with denudation,the lower sedimentary burial.It is a kind of very important in oil and gas basin tectonic units which located in between uplift and depression.It is the main strip of sand accumulation in the basin,and the the main formation and distribution places of large lithologic stratigraphic trap.This paper choose the production Wells as the research object,which located in CBM development demonstration area in Panzhuang block of Qinshui Basin.Gathering the main reservoir geological factors and the main reservoir parameters and mining historical data,and simulatting coalbed methane Wells through the software of Coalbed methane reservoir dynamic assessment system and COMET3.Then analysis of the sensitivity of the reservoir parameters,single well pattern space model is established and the reservoir geological model.On the basis of above work we combine with GIS technology to establish TIN model and classify the slope in the study area,and analysis of structural slope area in the change of the development of a vertical Wells reservoir space form,and research the influence of reservoir space when single well rank at different positions of the slope.Now we made the following conclusions:(1)Using GIS software pretreatment of coalbed methane reservoir raw data in the studied area,and extracting the 3 # coal seam buried depth,thickness of coal seam gas content contour respectively and establish TIN model of slope of 3 # coal reservoirs in the study area.With west Panzhuang 4 high rank CBM Wells as the research object,the gradient distribution are that PZC-04,PZC-05,PZC-06 well located at 0 ~ 5°on the micro shelving,PZC-03 Wells located at 5°~ 8°slower slopes.(2)Combine with the reservoir sensitivity analysis,to analyses the influence of the direction and permeability to single well reservoir pressure distribution through Coalbed methane reservoir dynamic assessment system.From the change of the reservoir pressure,rank the initial reservoir pressure in the study area as a whole to drop,but still overall reservoir pressure is greater than the critical desorption pressure,after adsorption gas desorption evident in the near wellbore,forming obvious pressure drop funnel;The direction of the permeability difference of single well reservoir pressure distribution form is larger,the influence of reservoir pressure drop funnel in permeability advantage direction have obvious positive effect.(3)On the basis of the study area reservoir slope distribution model and the present distribution of production well,combining with the different structural slope parts of reservoir well spacing ratio.Through the numerical simulation results and spatial distribution of the single well reservoir pressure,we can know that the morphology of central syncline in the study zone gas production rate is higher than other parts of the gas production;At the same tectonic position,the slope is higher,the gas production rate is higher,the gradient transitional zone gas production rate higher than the slope transition zone of the slope with gas production;The same tectonic position and slope belt of the same area,the slope is higher,the gas production rate is higher,and the greater the coal floor elevation,the high volume is larger. |
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