关键词: 有利砂体, 天然气, 合成地震记录, 多井约束, 识别模式

Abstract:

The output of natural gas is closely associated with thickness, porosity, connectivity of the sand and the ratio of sndToceth conformation, direction, changes and connectivity of sand in special, we have done subtle identification and interpretation of the sand in this field based on previous investigation and studies. The responses of sand in seismic profile usually are high amplitude and low frequency. The beneficial containing natural gas sand of high porosity and connectivity is characterized by low velocity and reversal polarity. But we found that the responses of sand in this field are divers, hestphnomenon of severe inconsistent between synthetic seismogram and the seismic records besides wells. Therefore we cannot identify the sand in this field by uniform mode. We have carried out this work by the way of constraining of many wells, standardizing with many formations and interpreting layer by layer on seismic synthetic records. The present paper introduces our sand identification and its interpretation methods in this field.

Key words: beneficial sand, natural gas, seismic synthetic records, constraining of many wells, identification mode