Study On Geographic Information System

In this paper,the Es3 member of the Linnan sag is used as the main research stratum,using sequence stratigraphy,sedimentary petrology and other theories and methods,comprehensive use of geological,geochemical,and various analytical tests,and high-resolution sequence bottom science.The subdivision of the sequence stratigraphy of the Es3 segment in the Linnan depression,combined with the sequence,establishes the sedimentary evolution model of the depositional system types and distribution rules of the Es3 subsegments in the Linnan depression,based on the reservoir physical properties and diagenesis The reservoir characteristics of each subsection of Es3 are studied,and a comprehensive reservoir evaluation is made to provide reference for the exploration of oil and gas reservoirs in the study area.Under the guidance of the basic theory of sequence stratigraphy,the Es3 segment is subdivided into three subsegments by identifying the interface of each subsegment of Es3,combining the maximum entropy spectrum and wavelet analysis,and the Es3 segment is divided into a long-term cycle and Six mid-cycle cycles to determine the highresolution sequence stratigraphic division scheme of the Es3 member and establish a high-resolution sequence isochronous stratigraphic framework in the study area.By using the elemental analysis data of the core and observation of the core in the study area as an indicator to determine the sedimentary environment,it was determined that the climate in the Es3x sub-segment of the Linnan subsidence was relatively dry,the paleo-salinity was high,and the water body in the lake basin evaporated seriously Relative to the lake level is low,the effect of water flow is not obvious.During the Es3z sub-segment,the climatic conditions were relatively humid,the ancient water depth was the deepest,and the lithology was mainly gravel sandstone.During the Es3s sub-segment,the climate was dry,the water area continued to expand,and the depth continued to decrease.The study area mainly develops delta and fan delta deposition types,and there is the influence of gravity flow deposition.By analyzing the reservoir physical properties of each subsection of Es3,combined with the analysis of laboratory data,the rock composition,pore type,diagenesis,diagenetic evolution,and other related physical properties in the study area were determined.Using the method of fuzzy evaluation and single-well evaluation,it is analyzed that the Es3 x subsection is deeper,and the reservoir development is worse than the Es3 z sub-section.The main high-quality reservoir area in the Es3 segment,and the Es3 s sub-period is greatly affected by diagenesis,which has an adverse effect on the reservoir.