Hydrocarbon Accumulation Conditions Of Cretaceous-Paleogene In Fangzheng Fault Depression

Based on the recent theory and method of Stratigraphy.Sedimentology an Seismic Stratigraphy.this paper uses seismic logging and core information to analyze and search the sequence formation frame work and sedimentary facies of Cretaceous-Paleogene in Fangzheng fault depression.Moreover,combined with structural geology feature of Fangzheng fault the combination law of oil source bed,reservoir and cap rock of Cretaceous-Paleogene is studied and the distribution area of favorable and body is predicted.The result offers the dependa evide for sequence division and it is significant for the exploration and development of oil and gas.According to seismic, comprehensive logging, logging and core information, Fangzheng fault hydrocarbon source rocks are in Cretaceous,Eocene series and Oilgocene series of Paleogene system According to fang 4 well and fang 6 well color spectrum and mass spctrum analysis results contrast primary oil may come to the futher deep Cretaceous and xin an cun groop of Paleogene.Fangzheng fault depression reservoir parameters on the evaluation of the reservoir evaluation that class,Baoquanling groop is the good reservoir and favourable oil and gas accumulation zones of the region.Baoyi section and Dayi section develop mudstone and their blocks ability of oil and gas are better strong,and are good cover regional and local coverThe traps have been found consist of failed nose traps,failed anticline traps,block fault traps.According to oil gas accumulation condition analysis,the research district present good oil gas accumulation condition.So,the traps wether present and are valid are the main control factors of oil gas accumulation.This paper predicts two favorable perspective plays by comprehensively considering basic conditions for the formation of reservoir (source bed, reservoir, cap rock and trap, etc) and distribution of sand bodies.