正、反演结合对川东石炭系储层地震响应特征的分析

川东地区石炭系碳酸盐岩储层是油气勘探开发的重点及难点储层之一。该储层以厚度小且变化大、低孔、低渗、非均质特点强为特征；地震响应上表现为典型的薄层响应特点。这里综合考虑了石炭系储层和上覆梁山组地层不同的地质特征，建立了地质、测井分析控制下的精细模型及正、反演，探讨了檀木场气田石炭系储层的地震响应特征。其正演结果表明，梁山组地层对石炭系的地震响应具有重要的影响，时差较振幅更为敏感。在正演结论指导下，运用考虑了时差和梁山组地层的初始模型，获得了较高精度的反演结果。

THE ANALYSIS FOR SEISMIC RESPONSE CHARACTERIC OF THE CARBONIFEROUS RESOVIOR AT THE AREA OF EAST SICHUAN BY COMBINING FORWARD AND INVERSE

Carboniferous carbonate formation at the area of Eastern Sichuan is one type of the important and complex reservoirs during the gas exploration and development. Geologically, it characterizes in thin layer with great variation, low porosity and permeability, and strong heterogeneity, which has a typical seismic responses of thin layer. This paper gives an example of Carboniferous re servoir at Tanmuchang gas field with integrated consideration of various geologi cal characteristics of Carboniferous reservoir and its overburden Liangshan Form ation. Then fine models is built under the constraints of geological and log analysis. Finally, forward and inverse modeling techniques are used to analyz e the seismic responses of the Carboniferous reservoir . The forward results ind icate that Liangshan Formation has significant influence on the seismic response s of the Carboniferous reservoir and difference of travel time is more sensitiv e than amplitude. Referring to the forward results and the initial model which considers the difference of travel time and Liangshan Formation,the more accur ate inverse results are obtained.