Research On The Sedimentary Micro Facies Of Shuangtaizi Anticline Shuang 6 Gas Storage In Liaoxi Sag

The shuang 6 gas storage is located in the southern part of the western depression of the Liaohe Basin.It is structurally located on the Shuangtaizi anticline fault zone,forming a trap area of about 7.1km2 and an upper cover layer thickness of about 200-400 m.The surrounding boundary fault both have good sealing.In order to expand the gas storage area,it is necessary to accommodate the surrounding five blocks and establish a shuang6 gas storage group.Therefore.it is necessary to carry out detailed fine stratigraphic division and sedimentary microfacies description of the shuang6 gas storage.which is of great geological significance for the subsequent construction of the shuang6 gas storage group.Based on high-resolution sequence stratigraphy,this paper uses the INPEFA technology and other stratigraphic division and comparison methods to classify the strata of the Xinglongtai oil layer of the Shahejie Formation of the shuang6 gas storage.In view of the wide area of the shuang6 gas storage area and the development of the thick sand layer at the bottom,in this paper.seismic identification is used to control the oil group interface and attribute analysis is used to classify different sand groups,core-logging comprehensive analysis is used to determine the interface and the spiral back analysis is used to divide the small layers.Finally,the three-level,four-level and five-level sequence base-level cycles are identified and divided,and the layers are compared.By establishing a standard well,comparing the single well cross-well logging curve with the lithologic sand body development characteristics,the single well drilling fault condition is analyzed,and the seismic profile is used to verify each other,and the original stratified data is corrected and divided.According to the single well sequence stratigraphic division and comparison results,a medium-term high-resolution stratigraphic framework of the Xinglongtai reservoir of the shuang6 gas storage was established.Through the analysis of the plan of mudstone color index,the plane of the number of terrestrial spores,the plane of sand thickness and the plane of ratio of sand layer to formation of the Xinglongtai oil layer of the shuang6 gas storage reservoir.Combining the single well phase data,the core data and the sedimentary background of the western Liaoning sag,the comprehensive analysis suggests that the source of the Xinglongtai oil layer of the shuang6 gas storage reservoir is from the western bulge in the northwest direction.The color types of mudstone in the study area are mainly light gray and gray,reflecting the weak oxidation-weak reduction deposition environment.The lithology of the strata is dominated by glutenite,mudstone,coarse sandstone,medium sandstone,fine sandstone and siltstone.The sandstone types are mainly divided into lithic feldspar sandstone and feldspar sandstone,and the content of feldspar and cuttings is high.This shows that the handling distance is close.The degree of rounding of the crumb particles is relatively poor,showing sub-edge to sub-circlc,poor sorting and weaker weathering.The contact and support relationship are mainly caused by line contact and particle support,indicating that the sediment source in the study area is close and the crumb particles are less affected by the modification.Plate-like and trough-like staggered bedding formed in a strong hydrodynamic environment in the study area,and the gluten is very developed.Therefore,it is considered that the fan-delta front subfacies deposits in the Xinglongtai oil layer of the shuang6 gas storage reservoir.Combined logging phase mark,this paper describes the sand body plane distribution characteristics,sedimentary microfacies plane distribution characteristics and sedimentary micro facies profile distribution characteristics of 18 small layers in the Xinglongtai oil layer of the shuang6 gas storage.Finally,the paper summarizes the sedimentary evolution law of the study area,and finally establishes the sedimentary model of the fan-delta sedimentary system of the Xinglongtai.oil layer in the shuang6 gas storage.