Thin Sand Body Description And Favorable Zone Prediction Of The First Member Of Shawan Formation In Chepaizi Area

The Junggar Basin is located in the northwest of China and occupies an important position in China 's oil and gas exploration.Since development,it has discovered abundant oil and gas resources and has great potential for development and exploration.The Chepaizi bulge is located in the western margin of the Junggar Basin.In the early stage of exploration,due to the rich oil and gas resources,good results can often be obtained by understanding the geology or analyzing the seismic attribute interpretation.With further exploration research,due to the unclear understanding of some geological sedimentary facies and the unclear accumulation pattern and characteristics,no major breakthrough has been made so far.In this paper,the characteristics of sedimentary facies and accumulation model of this target horizon are studied for the description of the thin sand body in the first section of Shawan Formation in Chepaizi area and the prediction of favorable zones.This article is based on modern oil and gas accumulation theory,based on underground geological data,geophysical data,and based on sequence stratigraphy theory and the study of sedimentary facies and provenance distribution in the study area.According to different favorable reservoir types,the stratigraphic division plan is refined and established.The fine sequence stratigraphic framework is used to clearly show the morphological characteristics and distribution laws of sandstone reservoirs in the horizon.Based on this understanding,a series of methods such as seismic multi-attribute analysis and constrained sparse pulse inversion are used to predict A favorable area for Tibet.That is,through the combination of fine seismic interpretation and geological sedimentation model,the hidden traps in the target area are predicted.According to the above research results,the distribution of sand bodies in the study area is mainly controlled by sedimentary facies.The braided river delta sedimentary system mainly consists of thick conglomerates in the south,and the belt transformed by the lake wave in the north.The coastal sand bodies are distributed in a shape,and the lake submarine fan is developed in the central area;from the structuralcharacteristics,the study area has good oil and gas accumulation conditions;according to the results of the study and analysis,it can be known that the accumulation characteristics are north upward dip and sharp extinction The northward tip of the tip along the tip-off line or the high part of the structure is an advantageous accumulation area.