Study On Potential Exploitation Of Denglouku Formation Gas Reservoir In Fulongquan Gas Field

Denglouku formation of Fulongquan gas field is an important gas field productivity construction area in Jilin Oilfield.However,in this area,the recognition of logging geological gas reservoir characteristics is not enough,and the enrichment law of gas reservoir is not clear,especially the relationship between gas and water is not clear.In view of these problems,the research and application of logging geological gas reservoir potential are carried out to find out the fluid identification method suitable for the geological characteristics of the gas field in the study area,find out the gas reservoir enrichment law,and provide technical support for the screening of potential areas in the study area.Based on the natural geological conditions of Fulongquan gas field,combined with previous research,this paper integrated well logging,cores and other data to aim the stratigraphic division and correlation,structural controls,sedimentary characteristics,reservoir physical properties and logging interpretation model of reservoir parameters.The fluid identification and analogy of the wells in the study area are carried out by integration of density neutron log overlapping identification,density resistivity log intersection identification,porosity resistivity log intersection identification,gas peak to base ratio apparent wave impedance intersection identification and apparent wave impedance compensation neutron overlapping identification.These methods would provide a suitable technical sequence for existing well recheck in study and adjacent areas.In the Fulongquan area,the anticlinal structure is complicated into terrains,horsts and grabens by faults.In addition,the early-stage faulting system was suggested to control the hydrocarbon accumulation.The study area is deposited with braided river delta plain sediments.The superimposed distributary channels distributed in belts striking south to north,with sheet sand sedimented at the edge.Fulongquan gas reservoir belongs to faulted lithological gas reservoir.The gas reservoir is controlled by anticlines,fault blocks,lithologies and physical properties.The study area shows a feature of low porosity,medium-low permeability reservoir.There are 145 gas and water layers in 17 wells,which have great potential for gas reservoir.Meanwhile,results show that the gas water layer with high gas saturation is suggested to be the most promising direction for future exploration.