Method for calculating formation water mineralization degree
A technology of formation water salinity and salinity, which is applied in the field of prospecting wells, can solve the problems of not predicting the formation water salinity of new wells and not considering the impact, etc., and achieves the effect of high actual efficiency and low cost
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Embodiment 1
[0052] In an offshore oilfield, historical well formation information, logging parameter information, mud filtrate and formation water salinity information are collected as shown in Table 1. The new well formation information, logging parameter information, mud filtrate and formation water salinity information are shown in Table 2.
[0053] According to the data in Table 1, the model is established by the method of multiple linear regression, and the model is as follows:
[0054] Formation water salinity=5286.081+2.085×depth-19.674×pressure difference between mud and formation+0.163×pumped fluid volume-43.814×pumping time+46.399×mud content+314.771×porosity-20.340×water saturation- 7.734×permeability+0.064×salinity of mud filtrate.
[0055] Through the model, the formation water salinity of sample 1 and sample 2 are calculated to be 9686mg / L and 11520mg / L respectively;
[0056] The measured values of formation water salinity of sample 1 and sample 2 are 8927mg / L and 11050m...
Embodiment 2
[0058] According to the historical well information data in Table 1, using the neural network method, the input layer data standardization method involved in the neural network modeling is range standardization. The input parameters include the number of network nodes is 10; the learning rate is 0.8; the impulse coefficient is 0.1; the maximum absolute error is 0.0001; the sum of squared errors is 0.0001; the maximum number of iterations is 500, and the modeling is completed. Afterwards, the neural network model is used for prediction, and new well formation information, logging parameter information, mud filtrate and formation water salinity information are brought into the model.
[0059] The calculated formation water salinity of sample 1 and sample 2 are 9319mg / L and 10602mg / L respectively. The measured values of formation water salinity of sample 1 and sample 2 are 8927mg / L and 11050mg / L, respectively, and the calculation errors are 4.4% and 4.1%, respectively.
[0060...
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