Abstract: Six growth curves used for prediction of oilfield development indexes expressed with trigonometric function are proposed, thusperfecting and abounding in the existed growth curve methods further. The cumulative production (N_p) VS time (t), production (Q_t) vs t, Q_t vs N_p, calculation formulae of the ratio of N_p to maximum recoverable reserves (N_Rmax) corresponding to the peak production (Q_tmax), $(N_p/N_{R\ max})_{Q_{t\ max}}$ amwocriterion, and the formulae for obtaining the parameters of the growth curves were proposed and derived. Study of these growth curves indicatethat they are similar in characteristics; $(N_p/N_{R\ max})_{Q_{t\ max}}$ ranges from 0 to 0.36785, which belongs to situation of peak procuction Q_tmax appears inthe early stage of oilfield development; Q_t vs N_p for them assumes dissymmetrical arched curves on the rectangular coordinates. Moreover, therepeated linear regression method passed the origin for obtaining the parameters of these curves is presented. A case from Shuanghe oilfieldshows that these growth curves have certain applicable values.

Key words: growth curve, trigonometric function, production index, prediction