Fine 3D Geological Modeling And Application Of Longwangmiao Formation In Moxi Block

Since the Longwangmiao Formation gas pool in Moxi has been put into production,it has shown great potential for gas reservoir development.However,the actual production process found that the production of water from multiple wells or the risk of water production did not match the predictions of the earlier geological models.Obviously,the characteristics of gas reservoirs are far more complex than those of earlier geological models.It is difficult to meet the needs of the timely dynamic development of the gas reservoirs in the Longwangmiao gas reservoir.Based on structural geology and other theories,this paper comprehensively utilizes seismic sections and drilling,surveying,and well testing data,uses seismic reservoir prediction methods,single well logging peoperty quantitative evaluation techniques,and geological structure modeling methods for gas reservoirs in working areas.Effective reservoir prediction provides the basis.For geological data processing system standardized processing,established a three-dimensional geological model of the Longwangmiao formation.The comprehensive research shows that:(1)The most positive and negative curvature bodies have certain significance for the development of fractures,and the dip angle attribute based on structural tensor extraction may indicate the distribution of the caverns in the reservoir to some extent.(2)The ant-tracking attribute body was extracted after preprocessing such as fusion amplitude preserving processing,construction smoothing,chaos and variance,and the ant-body extraction effects of different methods were debugged several times.It was found that the method was based on the passive ant-body and used again.The characteristics of crack fragment after active ant tracking are obvious.(3)Based on the method of "random and deterministic combination,logging attribute fixed point,seismic bright spot shape" method,and establish the Longwangmiao group porosity and permeability model by well-shock combined method,the whole belongs to low porosity and low permeability reservoir.(4)The MX8 well area at the gas-water interface is generally around-4385m,while the MX21 well area is at around-4360m.And the gas-water interface is low in the east and high in the west.Local gas-water interfaces are slightly different caused by low permeability,faults,and structural fluctuations.The gas-water interface distribution maps were established in different well areas,and the air column height model was further established.The analysis of the statistical results of the wells,holes,and single wells and the fracture prediction results showed that the wells of MX17,MX46 and MX47 cracks were extremely developed and water incasion are extremely easy.(5)Calculated by the volumetric method reserves,the Moxi block is bounded by the northwest-southeast-facing fault developed at the west end.The reserve alculation is divided into the Moxi 8 well area and the Moxi 21 well area.The total resevers of the Long III section of the Moxi block is 1845.3×108m3,the total length of the Long section is 969.4×108m3,and that of the Long wang×miao group is 2814.7×108m3.