1. A method for generating a total asset valuation for a potential oil and gas field asset target by total asset modeling, which method comprises: (a) selecting a potential oil and gas field target asset; (b) generating a list of potential conceptual engineering design scenarios for the potential asset target selected in step (a); (c) retrieving from a library a unique type model; (d) associating the retrieved unique type model with each potential conceptual engineering design scenario wherein each unique type model includes one or more economic variables and one or more technical variables; (e) performing an initial technical feasibility analysis on each potential conceptual engineering design scenario from step (d); (f) evaluating and removing each potential conceptual engineering design scenario from step (e) that is not technically feasible to provide a technically feasible potential conceptual engineering design scenario; (g) updating each technically feasible potential conceptual engineering design scenario and associated unique type model over time using a computer processor by at least one of (1) adjusting each technical variable and each economic variable for the respective unique type model according to currently available economic data and technical data that is related to a respective adjusted variable and (2) adding at least one of one or more economic variables and one or more technical variables to the respective unique type model according to the currently available economic data and technical data that is related to a respective added variable to obtain an updated technically feasible potential conceptual engineering design scenario; (h) refining each updated type model by adjusting each technical variable and each economic variable for the respective updated type model according to the initial technical feasibility analysis for the respective updated technically feasible potential conceptual engineering design scenario that is related to a respective adjusted variable; (i) calculating a net present value for each updated technically feasible potential conceptual engineering design scenario; (j) ranking the updated technically feasible potential conceptual engineering design scenario in order of its respective net present value; (k) eliminating each ranked updated technically feasible scenario from step (j) that is not economical; (l) identifying one or more remaining potential conceptual engineering design scenarios that are both technically feasible and economical according to the respective technical feasibility analysis and its respective ranked net present value, wherein each identified remaining potential conceptual engineering design scenario represents both a technically feasible, economical scenario; (m) re-updating each refined type model associated with each respective both technically feasible, economical scenario by at least one of (A) adjusting each technical variable and each economic variable for the respective refined type model according to any additional economic data and technical data that is related to a respective adjusted variable and (B) adding at least one of one or more economic variables and one or more technical variables to the respective refined type model according to any additional economic data and technical data that is related to a respective added variable; (n) re-updating each ranked net present value for the respective both technically feasible, economical scenario; (o) identifying a list of the most profitable, technically feasible, economic scenarios from step (n); (p) submitting each profitable scenario identified on the list from step (o) to one or more engineering, procurement and construction contractors for bidding; and (q) selecting a best profitable engineering design scenario from the both technically feasible, economical scenarios based on at least one of the respective re-updated net present value and a respective acceptable project bid from an engineering procurement and construction contractor that includes a project timeline estimate for developing components required to produce at least one of oil and gas from the potential target asset; (r) executing the acceptable project bid for the potential asset target including procurement of at least one capital equipment.