Characteristic of Sedimentary Facies in the Lower Cretaceous Duhongmu Formation of Daerqi Oilfield

Based on mud logging,cores'description,electric log and seismic survey,etc.The sedimentary facies'types and their characteristics of Lower Cretaceous Tenggeer Formation,Baiyinchagan(BYCG) Depression Sanghe oilfield,were studied,as well as their distribution rule.The research showed that lacustrine environment and alluvial environment were present in the Duhongmu formation.In addition,from the margin to the depocenter of the depression,the sedimentary environments gradually changed from fan delta to middle depth lacus and deep lacus.The fronts of fan delta is still the important hydrocarbon accumulation area,and the fault-related turbidities in them are the potential targets of exploring the lithological hydrocarbon reservoirs.