A Study On The Sedimentary Facies Of The Tengge Formation In The Hanan Area

Hanan area,located in the east of A'nan depression in Erlian basin,is one of the main oil producing area of Erlian company of Petrochina Huabei Oilfield Company.There are three main oil-bearing formations developed,which are Palaeozoic,A'ershan and Teng'geer group of lower Cretaceous.Because of the developed fault,the boundary of reservoir is more difficult to determine.At present,there is a lack of comprehensive and in-depth understanding of the formation structure,the supply of sediment source and the sedimentary system.The first section of Teng'geer Formation is the main target layer in this paper,which is guided by the theory of sedimentology,based on the stratigraphic classification and correlation in the whole region,on the grounds of the observation and description of core,through the establishment of rock phase calibrations and log facies patterns,on the basis of the study of single well facies and profile facies,discussesing the characteristics of plane distribution of the sedimentary facies in the work area,combined with the core analysis data and the well logging interpretation,and get the following conclusions:1.According to the characteristics of marker bed and sedimentary cycle,the first section of Teng'geer Formation can be divided into T? and T? two oil formations,the thickness of stratum varies greatly due to the influence of synsedimentary faults and buried hills,north-south and east-west are showing thick,thin and white features.2.According to rock composition maturity,structure maturity,debris composition and mudstone color,combining with regional geological background,determining that Sunite Bulge in the southeast and the Mengulin Uplift in the northwest are the main sedimentary-sources of the first section of Teng'geer Formation,the Shayinwusu Uplift in the northeast is the secondary provenance.3.The sedimentary system of the first section of Teng'geer Formation is fan-dalta-lake facies,four subfacies and six microfacies are further classified.The fan-delta contains pro-fan delta and fan delta front subfacies,the lake facies contain deep-half deep lake and coastal shallow-lake subfacies.4.Through the statistics on the physical analysis of each sedimentary microfacies,the subsea distributary channel microfacies are the most advantageous reservoir facies belt,in the second place is frontal sheet sand,and beach bar is poor.