Study On Distribution Law Of Mawu₁₊₂ Gas Reservoir In Jingbian Gas Field X Well Area

To study the distribution law of gas reservoirs in the Mawu ₁₊₂section of Well X in JingbianGas Field,firstly divide and compare small layers;use core,logging,logging and gas testing data to determine the sedimentary microfacies in Well X Type and distribution of sedimentary facies.Reservoir research is carried out through petrological characteristics,diagenesis,pore structure characteristics,and reservoir physical properties;combined with previous research results to summarize,establish gas and water layer identification standards,so as to analyze the gas reservoir distribution law and control factors. The research results show that:(1)Structural features:Well X is located in the central part of the Yishan Slope with simple structure in the Ordos Basin.It is a gentle monoclinic dipping westward,with small low-amplitude structural undulations locally,forming nose-like structures and local synclines.structure.(2)Sedimentary characteristics:According to the analysis of core facies and logging equivalence,it is determined that the main tidal flat facies are developed in the Mawu ₁₊₂member of the X well area.The sedimentary microfacies are mainly composed of Yunping,Huiyunping and Niyunping microfacies Composition,Yunping is the most common.(3)Reservoir characteristics:Mawu ₁₊₂ in Well X is a low-porosity-low-permeability reservoir.The rock types are mainly dolomite.The main storage spaces are intercrystalline pores,gypsum mold pores,micro-cracks,and dissolution.Hole(hole).Common diagenesis includes dolomitization,dissolution and structural fracture.(4)Gas reservoir distribution law:According to the statistical analysis of gas test data,there is no obvious difference between gas and water layers in the same well in the Mawu ₁₊₂section of the X well block,and gas-water interbeds are rare.Gas reservoirs in the Mawu ₁₊₂ section of the X well area are mainly distributed in the middle and east of the X well area,and the gas production is good.The water layers are mainly distributed in the southwest of the well area.The distribution of gas reservoirs is mainly affected by stratigraphic facies,structure,and diagenesis.And the control of ancient geomorphological factors.