Research Of Sedimentary Facies In East Subfoveal Of The Nanbeier Sag Of Tamuchage Basin

The Talmud basin lattice can be divided into five grade tectonic units which is the western depression zone and balaam-sabah raga uplift zone,the Talmud was made in the depression zone,bell-bowie Noel uplift area,the sound-sambre depression area.Which examines the Talmud,depression zone is composed of three sag,Nanbeier sag is one of the important sags,the concave area is thousand square kilometers,divided ininto two depressions,through exploratory well reveals that there exist thick dark mudstone layer,which has good conditions of hydrocarbon source rock,reservoir and cover configuration is complete,but the current understanding of sedimentary facies still have some limitations,oil and gas field exploration and development progress is slow,so it is necessary for a more detailed and accurate sedimentary system research to provide geological support for the next large-scale development.? ?This research mainly on the high resolution sequence stratigraphy,sedimentology,seismic sedimentologysedimentology and some other disciplines theories,based on the early stage of the predecessors' research results and regional geological background,based on the analysis of core,assay,seismic,logging data,the application of geological,geophysical and geochemical methods,the combination of from dot to line to face to the body eventually study research ideas,establish the Nanbeier sag in sequence stratigraphic framework,and on the basis of the analysis of the sequence stratigraphic sedimentary facies types and characteristics,this paper discusses the single well sedimentary facies,profile and plane distribution rule,finally analyzes the sedimentary system and sedimentary evolution mode.The Nanbeier bell sag can be divided into four three-level sequences,eight four-level sequences,and the Tongbo formation is divided into two three-level sequences which is SQ1 and SQ2,and the Nantun formation is three-level sequence SQ3,and the large grinding river group is SQ4.The main developing fan delta and shallow lake facies were analyzed by using core observation,analysis and analysis,logging phase and seismic facies in stratigraphic stratigraphic framework.The Nantun formation mainly develops the near shore underwater fan,the fan delta,the nearshore underwater fan,the deep lake and the semi-deep lake facies.Among them,the west subducts originate mainly from the east and west.The north depressions in the east were mainly derived from the western,eastern and northern parts of the bay.In the east,the source of the trough is from the west and east,which can identify seven sources.At the beginning of the copper bowl temple group sedimentary sag within the fault depression state of dispersed distribution,sedimentary sag in lakes started in the process of continuous development,source supply is adequate,around the sag has distribution,sedimentary system mainly developed fan delta and lake sedimentary system types.Nantun formation sedimentary period can be divided into two phases,During the middle and lower sedimentary period,the lake is regressive,and the sedimentation of the sedimentary fan delta gradually overtakes the lake facies.In the early retrogradation fan delta mainly "skirt edge" shape distribution in eastern depression actic region.The water depth of the upper sedimentary system of Nantun formation gradually becomes deeper and sedimentary environment became more stable and mainly developed lake sedimentary system.