Reservoir characteristics and it's influencing factors of the upper section of the first member of Tenggar Formation in Block Aer 29 of Aer Sag
With the deepening of oilfield exploration and development,the oil-bearing strata of the upper section of the first member of Tenggar Formation(K1bt1upper)have been gradually implemented.To clarify the reservoir characteristic and it's influencing factors of K1bt1upper in Block Aer 29 of Aer Sag,an integration of core observation and the data of drilling,thin slice identification,scanning electron microscope,X-ray diffraction analysis,physical analysis and capillary pressure curve measurement,is applied to the study.The results show that K1bt1upper in the study area is fan delta front subfacies deposition and the reservoir lithology mainly include gray feldspar lithic sandstone and complex composition glutenite,which has the characteristics of low maturity of rock composition and low evolution degree of clay mineral characteristics.The reservoir space types are mainly intergranular pores and secondary dissolution pores,which belongs to ultra-low-medium porosity and ultra-low-low permeability pore reservoirs.The pore structure is comprehensively classified as medium-poor degree.When intergranular pores and secondary dissolution pores are jointly developed,it has better storage and permeability capacity.The development of the reservoir in Ki bt1upper is mainly affected by sedimentation and diagenesis.The provenance,lake level fluctuation and sedimentary microfacies control the spatial distribution of the reservoir,the reservoir heterogeneity and the mineral composition.In terms of the mineral composition,the higher the quartz content,the better the permeability.Mechanical compaction and clay minerals cementation cause porosity reduction and pore throat complexity,while dissolution effectively improves reservoir physical conditions.
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