Characteristics of Carboniferous Inside Volcanic Mechanisms in the First Area of Kebai Fault Zone in Karamay Oilfield
High yield oil flow was obtained through multiple well testing of exploration wells and evaluation wells drilled inside the Carboniferous system in the first area of Kebai fault zone in Karamay oil field.Through the analysis of core,thin section and physical property data,as well as the study of reservoir characteristics of Carboniferous internal volcanic institutions.The results show that the Carboniferous system in Zone 1 is mainly composed of overflow phase basalt and explosive phase angle conglomerate.The natural gamma relative values of basalt and andesite are ≤ 0.3,0.3＜natural gamma relative value of conglomerate ≤ 0.7,and natural gamma relative value of tuff＞0.7;The volcanic rock eruption center in the study area is located in A18,A5 and other well areas.It is a multi-point central eruption along the Karamay fault and the North Heiyoushan fault.The high angle volcanic channel is pressed and cut through the continu-ous formation in multiple stages.The side of the volcanic channel forms a complex tensile three-dimensional fracture net-work,which is conducive to improving the reservoir and an important factor for high production of oil wells;The devel-opment model of the"ternary controlled reservoir"reservoir,which is controlled by the structure,lithology,and weather-ing and leaching of the Carboniferous period,has been clarified.The weathering crust is in the C4+C3 stage with a thick-ness of 300-600 m.The vertical favorable reservoir gradually deteriorates from top to bottom,and the production effect of the C4+C3+C2 phase is better,which can be the main layer for subsequent production.
Karamay OilfieldVolcanic institutionsThree element control storageExplosive phaseOverflow phaseWeathering leaching
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