Prestack inversion method based on seismic restrained modeling

Abstract

The invention relates to a prestack inversion method based on seismic restrained modeling. Prestack inversion results are directly determined by the quality of a constraint model, but a model for strong anisotropic carbonate reservoirs can not be quantitatively established through the facies-controlled modeling method or the karst modeling method or the reservoir facies modeling method or the like; in addition, follow-up inversion and reservoir prediction are not accurate due to errors existing in routine basic data of the methods. According to the prestack inversion method, based on prestack amplitude preservation gathering, firstly, the AVO effect is removed through the pure longitudinal wave extraction technology so as to improve data accuracy and then a quantitative model reflecting secondary reservoir distribution rules is established through relative impedance and logging data obtained through color inversion so as to instruct inversion. As is shown in actual data application, development details of secondary carbonate reservoirs can be depicted more clearly through prestack inversion results based on seismic restrained modeling. The prestack inversion method has the advantages that the prestack inversion method can be directly applied to actual data, and particularly development rules of reservoirs in deep zones without wells can be depicted more accurately through the prestack inversion method.

Description

technical field [0001] The invention belongs to the field of petroleum exploration, in particular to a pre-stack inversion method based on seismic constraint modeling, which is suitable for prediction of strongly heterogeneous carbonate rock reservoirs. Background technique [0002] In recent years, significant progress has been made in deep carbonate oil and gas exploration in the Tarim Basin. During the 11th Five-Year Plan period, four high-efficiency oil and gas development zones including Lungu, Yingmaili, Halahatang and Tazhong I have been preliminarily established (Tarim Petroleum News, 2011). The oil equivalent of proven and controlled reserves of carbonate rocks has already accounted for half of the reserves of the entire oilfield, and the annual output of crude oil has exceeded 1 million tons, basically having a resource base of annual output of 3 million tons (Xinjiang News Online, China Pipeline Business Network, etc., 2012) , showing great exploration prospects....

AI Technical Summary

Problems solved by technology

Traditional methods such as phase rotation, trace integration, and recursive inversion do not consider wavelet factors, which is equivalent to not establishing a connection with subsurface geology; the more complex sparse pulse inversion that considers wavelet factors requires very high skills to be correct

Images