摘要
振幅随炮检距变化(AVO)检测技术是目前寻找油气藏的主要技术。根据Zoeppritz简化方程,确定出AVO属性求取公式,通过实际模型确定出储层在含油气与含盐水情况下的差异,可以通过AVO交会图来模拟由烃类因素引起的异常现象和变化趋势。模拟结果表明,应用λρ属性剖面与μρ属性剖面交会图、P波波阻抗与泊松比属性剖面交会图,能够检测出含油气砂岩所引起的异常变化,根据交会图中的异常范围,可以标定出含气层在钻井地层中的位置。验证结果表明,利用AVO属性剖面的交会图确定气层范围是一种有效的方法,其岩性参数计算是AVO反演技术中的关键。
At present, amplitude versus offset （AVO） is one of the main technologies of searching for oil and gas reservoir. Based on confirming the expressions about AVO attributes by simplified Zoeppritz equations, the differences between oil or gas layer and brine layer were determined by AVO model. And the abnormity and trend caused by hydrocarbon can be simulated by AVO crossplot. The results indicate that the abnormity of oil and gas-bearing sand can be detected using the crossplot of λρ attributes and μρ attributes, the cross plot of P wave impedance and σ ratio. And the position of gas-bearing bend in the drilling formation can be determined according to the range of abnormity in the crossplot. The test result shows that using crossplot of AVO attributes sections to confirm the ranges of oil and gas-bearing bend in hydrocarbon reservoirs is effective. The lithologic parameters calculation is the key step of AVO inversing.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第2期41-44,50,共5页
Journal of China University of Petroleum(Edition of Natural Science)
