Abstract:Dolomite gas reservoirs were well developed under gypsum and salt rocks in the Ordovician Majiagou Formation,the central and east of Ordos Basin,However,it is very difficult to predict this kind of gas reservoirs because they are characterized by thin beds,strong heterogeneity,laterally rapid change,andlittle impedance difference with surrounding rocks.Therefore,based on high-precision internal imaging in the Ordovician carbonate rocks,a series of key techniques are used to predict dolomite gas reservoirs,such as seismic forward modeling,rock physical modeling,and prestack inversion of sensitive elastic parameters.Good results have been achieved in the reservoir prediction and the well deployment.The following understandings are obtained:①Favorable subsalt reservoirs show weak complex wave; ②Brie equation (e=2) can be used to calculate the bulk modulus of mixed fluids,and can also be used for rock physical modeling and shear wave prediction because it characterizes the relationship between elastic parameters and the gas-bearing property of subsalt reservoirs;③If the Poisson ratio of gas-bearing beds is less than 0.27,gas reservoirs can be delineated by crossplots of the Poisson ratio with p-wave impedance,and "small negative anomaly" of high frequency of fluid mobility indicates gas-bearing reservoirs.
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