Study On Physical Characteristics Of Chang 6 Member In Z15 Well Area In Ordos Basin

The Ordos Basin is the second largest sedimentary basin in China.Due to the earlier exploration and development of some oil and gas fields,the results obtained in the sedimentary facies,reservoirs,and development are not enough to meet the needs of rolling development.Therefore,the Z15 well area needs to be deeply studied.The old area is digging the latent.Based on the theory of stratigraphy,based on the theory of sedimentology,reservoir geology,logging and geology,this paper analyzes the basic geological data of the Triassic Yanchang Formation in the Z15 well area of Ordos Basin and combines the previous research results,and integrates the core materials,logging data,seismic data and the seismic data.The physical properties of reservoir in the study area were systematically studied by testing and analyzing data,Defining the temporal and spatial distribution regularity and evolution model of reservoir physical properties in the study area.Through the study of reservoir characteristics,it is clear that the petrological characteristics of the Triassic Yanchang Formation in the Z15 well area are feldspar quartz sandstone,lithic quartz sandstone,feldspar sandstone,and a small amount of lithic sandstone,and the pores mainly develop intergranular pores,dissolved intergranular pores,microcracks and a very small amount of intragranular dissolution.The main diagenesis is compaction,cementation,dissolution,alteration,metasomatism and dissection.According to the analysis of the physical properties of reservoir samples collected,the change law of the physical property of the reservoir is obtained.Firstly,the physical properties of individual wells were studied by using core wells to find out that the physical properties of the reservoirs became better from the bottom up;Secondly,the downward trend of the reservoir physical property is gradually decreasing.Finally,using each layer as a plotting unit,the plane porosity changes in the entire study area were analyzed.Finally,the temporal and spatial evolution of the physical properties of the study area was clearly defined.On the basis of the above research,combined with the previous research results and exploration status,the reservoir physical properties are mainly affected by diagenesis,tectonic action and sedimentary faces,and the metasomatism,corrosion alteration and rupture play a constructive role in improving the physical property of the reservoir,and the properties of the turbid water channel micro faces sand body are the best and the reservoir is the best.Best performance and good oil and gas display.