Hydrocarbon Accumulation Conditions Of Condensate Reservoir Of Qianfoya Formation In Bazhong-Tongnanba Area

With the increasing tense oil and gas resources,condensate oil and gas exploration has been paid more and more attention by various countries in recent years.Condensate oil has been paid much attention as an important oil and gas resource.Based on the study of the characteristics and distribution of hydrocarbon source rocks in the Bazhong-Tongnanba area,the characteristics of reservoirs are analyzed by using rock pyrolysis and SEM and so on,and the main factors of oil and gas enrichment in the study area are clarified.The following conclusions are drawn: the abundance of organic matter is low in the source rocks in the Bazhong-Tongnanba area,the type of organic matter is mainly type ?,the thermal evolution maturity is in the high mature stage,mainly forming wet gas,the characteristics of dark mudstone has thin individual bed and low continuity,belonging to poor grade;the dense reservoir of arkoses and lithic arkoses develops small pore and fine throat,belonging to poor permeability and porosity reservoir,and the main diagenesis are compaction,clay coating,early calcareous crystalline cementation and late calcareous pore-filling cementation and metasomatism,siliceous cementation and dissolution,the dissolution is not developed as a whole,the micropores are also rarely developed;Oil and gas is of the self-storage of lithology and fractured oil and gas reservoirs,the source rocks are mainly first and second member of the mudstone of Qianfoya Formation,the transport system is mainly produced by the extrusion fault and shear due to the medium-high angle cracks in the middle-late Jurassic;And the favorable distribution area of condensate oil is mainly composed of two parts: Yuanlu 172 well,Yuanlu 176 well,Yuanlu 177 well,Yuanlu 16 well and Yuanlu 4 well Area and Yuanba 9 wells near,with a certain exploration potential.