Sedimentary Characteristics Of The Teng-1 Formation In The Anan Sag

The Anan sag is located on the Annongan Anticline Anticline in the northeast of the Manitou Depression in the Erlian Basin.It has an area of 1,100 km~2 and a large oil and gas reserves.In the Erlian area,the Anan sag is one of the largest oil-rich depressions.The sag was discovered and formed.After several in-depth developments and drillings,the main body parts(such as the Anantic anticline,the Mongolian forest anticline,the Hanan buried hill,and the Fute structure),which are large in scale and simple in structure,have been drilled and developed in the Anan Depression.It is believed that there is potential for expansion and expansion around the old oil fields,but the faults in the area are relatively developed,the earthquakes are highly solvable,and the plane combination of faults is difficult,affecting the implementation of high points of structural traps.Through the analysis of seismic data,well logging,drilling,logging,analysis and testing,and using seismic sequence division,standard layer division bottom sequence,high resolution sequence stratigraphic theory to divide the boundary of each sand group and well seismic combination Methods:Twenty closed skeleton sections were established in the entire area.The Tengger component of the study area was divided into two sections,and the second section of the Tengge section was subdivided into two sand groups.This paper mainly applies several combinations of cuttings characteristics,particle size distribution characteristics,original stratigraphic thickness,detrital composition analysis,heavy mineral analysis,sandstone thickness and sand-to-land ratio,etc.,and comprehensively analyze the Tengger Formation and the Aershan Formation in the study area.The source direction of the clastic rock and the parent rock type are identified.It is determined that the main source of the Tenggeer Formation is from the southwest,northwest and northeast,and the secondary source is the southeast direction.Through core observations,rock composition,and well logging,seismic and other facies markers,it was determined that the main sedimentary deposits in the study area of the Tenggeer Formation are lacustrine facies,braided river deltas,and fan delta facies,in which the lake phase develops two subfacies.There are two microfacies of a subfacies in the braided river delta,and two subfacies of four microfacies develop in the fan delta facies.The single-facies core-phase analysis,single well sedimentary facies partitioning,well-shaft facies analysis,seismic section facies analysis,relative ratio of continuous well deposition,seismic plane facies analysis,well logging facies analysis,and physical property analysis have confirmed that the depositional facies belt of the Teng-1 Member is flat.Spread.