Study on the Distribution of Low-Permeability Carbonate Reservoirs in the Paleozoic Under Sulige Gas Field – A Case Study of the Combined Mawu1 +2 Reservoir in Majiagou Formation of TX Block

Abstract

The lower Paleozoic low permeability carbonate reservoir in Sulige gas field has great potential for development, but the study on it is relatively small, so it can not effectively guide the development. The prediction from the three aspects of reservoir characteristics, control factors, effective reservoir enrichment zone in the core analysis results, deposition, karst topography and structure on the basis of reservoir distribution effect analysis, the seismic geology combined with the implementation of the favorable area of development. The results show that the study area of reservoir lithology is mainly fine dolomite, dissolved pores and intergranular pores, large pores throat pore structure is the most favorable area of. The distribution of reservoir is mainly controlled by the sedimentary and karst landform effect, sedimentation provides the material basis for the development of reservoir, the reservoir in the gypsum dolomite flat microfacies development; residual hill and depression margin are the most favorable location reservoir filling into natural gas. The horse five1+2 seismic stratigraphic thickness, reservoir prediction of gas based on the combination of comprehensive reservoir evaluation implementation of the natural gas enrichment area, the development of effective guidance for the study area, has important significance to the development of a similar gas reservoir.