Study On Carboniferous Reservoir Characteristics Of Wuwei Basin In Hexi Corridor

Yumen oilfield is a history of70years of exploration and development of old fields, open up new areas for oil and gas exploration is imminent, and adjacent regions basin, the palaeozoic group breakthrough and progress, system in hexi corridor area carboniferous petroleum geological conditions and oil and gas exploration prospect is particularly important. The hexi corridor region, is one of the first to develop oil and gas exploration areas in China, is the main area of yumen oil field exploration, the wuwei basin is the key exploration in the basin, the hexi corridor region, wuwei basin in the south qilian mountain, north to dragon mountain-the north mountain-ho on the mountain is bounded, west arrived in peach gourd mountain, helan mountain, in the east and the carboniferous strata formation is the key exploration. On the basis of predecessors’ study, through field geological survey, analysis of sedimentary facies and reservoir rock analysis, the wuwei basin carboniferous strata, sedimentary facies, reservoir property and diagenesis are studied, some new understanding.The study on the basis of the existing study of qilian mountain, combining with the characteristics of development of corridor area of wuwei basin formation and carboniferous yumen oilfield exploration research the actual application situation and the latest stratigraphic classification scheme, the stratigraphic classification scheme from bottom to top as the carboniferous:Qianheishan group (C1q), Chouniugou group (C1c) and Jingyuan group (C1j), the carboniferous:Hongtuwa group (C2h) and Yanghugou group (C2y). Every interval of wuwei basin reservoir physical property analysis on longitudinal favorable reservoir interval and area.In addition, the study of wuwei basin from the carboniferous lithologic characteristics, compositional maturity and textural maturity, the porosity of the reservoir type, etc are studied.Through the corridor area of wuwei basin carboniferous samples of rock thin section, casting thin sections of system arrange, the diagenesis types of reservoir in this area are summarized and its influence to the reservoir property.Think wuwei basin in reservoir diagenesis is mainly as follows:compaction pressolution, cementation, dissolution, recrystallization, metasomatism and rupture. Constructive to the reservoir are:dissolution, rupture, metasomatism smaller influence on reservoir. It is because of the results of these diagenesis comprehensive reform constitutes the wuwei basin reservoir development characteristics of wuwei basin at present. The pore types are mainly composed of secondary solution pores. Wuwei basin carboniferous to shore facies and delta facies, clastic rock development, has a good original reservoir conditions, the thick carboniferous stratigraphic sandstone in-thick layer of lithic quartz sandstone, for coast on carboniferous shallow sea facies. Overall, jingyuan group in west alkali snap profile better reservoir physical property, sheep tiger groove group in the school education sichuan, xiaojing, red fort water tower ditch profile and soil reservoir physical property is better. Combined with field data, the existing evaluation of the distribution of favorable reservoir exploration and development provides geological basis for the next step.