Characteristics Of Kalashayi Reservoir In S75-AT10 Well Area Of Tahe Oilfield

In recent years,Well HY1 and HY2 drilled in Carboniferous Kalashayi formation have good indication of oil and gas,but at present,the research degree of peer microcharacteristics like reservoir characteristics,diagenetic evolution and reservoir control factors is low,which severely restrict the process of exploration and development of the Kalashayi formation.This paper relies on sedimentary petrology,reservoir geology,Combine multiple core analysis techniques methods like particle size analysis,rock wafer identification,physical parameter analysis,cathode luminescence,scanning electron microscope,X diffraction and fluid inclusion analysis.This paper study comprehensively on stone characteristics,reservoir characteristics and diagenesis of C₁kl Reservoir in S75-AT10Well Area of Tahe Oilfield,then discuss the main control factors of reservoir development.The research shows that the feldspathic quartz sandstone,debris quartz sandstone,feldspathic lithic sandstone,lithic sandstone are the main lithology types in C₁kl reservoirs which are line-contact,grain-supported,medium-to well-sorted and sub-edge to sub-rounded.The calcites are the main cements,and the matrices are filled by argillaceous matter and gray matter.The reservoirs are in medium-to low-physical properties,in which the porosity ranges from 9%to 15%with an average value of9.846%,and the permeability ranges from 0 to 1000×10^-3?m² with an average value of89.07×10^-3?m².The intergranular dissolved pores are well developed,with minor corrosion pore,intragranular dissolved pore and cracks.The throats with a poor connection are well-distributed.The reservoirs have undergone several diagenesis processes which include cementation,compaction,dissolution and so on.The early compaction and cementation decreased the reservoir properties,while the later dissolution contributed the effective space to the reservoirs.It stands out that the primary sedimentary facies and the later dissolution are the main factors for the properties.The sedimentary facies are the basement for the high quality reservoirs,while the dissolution is the key point.This study is more systematic,more detailed,more clearly re-understanding of the Tahe Oilfield S75-AT10 well C₁kl reservoir characteristics,which also has a certain guiding significance for exploration and development of oil and gas in Tahe Oilfield in future.