| Groundwater is the driving force of oil and gas resources.The migration,accumulation and accumulation of oil and gas cannot leave the ground water resources.In order to reflect the stratigraphic structure of eastern Qaidam better and study the distribution state of hydrogeological parameters in the eastern Qaidam basin,in the meantime to give consideration to the geological model,3D visualization,we need to use the petrel software formation stratigraphy model and permeability model for the further study about the numerical simulation of oil reservoir.The actual measurement of core data is an important part of the study.In this article we process the drilling core sample in the study area,to measure the porosity and permeability part of limestone and sandstone in eastern Qaidam and analyze the size distribution and change rule of the core porosity and permeability;The 3D geological modeling technique is an important component of geostatistics,and the geological modeling is more objective to study the stratigraphic and geological parameters in the three-dimensional space.In the eastern Qaidam basin area according to the prophase survey and geophysical exploration and interpretation of results,we preliminary forecast that the carboniferous in lime gully area has hydrocarbon accumulation conditions.According to the seismic interpretation data and logging data we can build the 3D structure model,the lithofacies model and the property model(including porosity and permeability)of carboniferous strata based on the petrel software.In the paper we have test 300 permeability experiment samples.The study found that the porosity size distribution is relatively uniform,averagely 4.5%,and there are big differences among the permeability size as well as the permeability of the limestone is generally below 0.1 md.And the permeability of the sandstone is about an order of magnitude larger than the permeability of the limestone.The measured permeability data also has a good positive correlation,and the data size can be used as a reference for the optimization of pore permeability modeling.In the paper we will establish the 3D strata model of the Lime gully region to response outcropping characteristics of the carboniferous strata in the area.The area has developed five NWW thrust faults,and the carboniferous strata from top to bottom in turn are the zabuza garshow group,the hurleg fm,the huaitoutala fm,the chengqianggou fm and the chuanshangou fm,in which the hurleg fm and the huaitoutala fm have a big thickness.By further study on its fine formation,controlled by sedimentary facies based on pixel we use the stochastic simulation method of the sequential index to establish the lithofacies model and pore permeability model.After analysis of data processing and model optimization we can determine the geological model accord with the actual situation of the study area.The hurleg fm mainly develops tidal flat-shore deposit in the study area and is sandstone,limestone and shale are the mainly components.The huaitoutala fm mainly develops platform deposits which mainly composed of carbonate rocks and mudstone.We presume that in the central region of the hurleg fm in the study area,the eastern region of the huaitoutala fm has larger sponginess and the eastern region of the study area has larger permeability distribution.We also find the interbedding phenomenon of the permeability,which is advantageous to the oil and gas storage.The distribution characteristics and laws of this area provide scientific basis for further reservoir prediction,regional parameter evaluation and later reservoir mathematical model. |
PDF Full Text Request