论文部分内容阅读
胜利油田存在着一种特殊的裂隙性油气藏,即泥岩裂隙油气藏。由于该类裂隙储层的孔隙度很小,岩石物性参数变化不灵敏,并表现出很强的各向异性,因此,其勘探难度很大。到目前为止,国内外还没有一套成熟的地质、物探、测井及钻井等资料综合分析的裂隙方位、分布、密度的识别方法。本文在研究国外裂缝检测方法的基础上,提出了波阻抗随方位变化(IPVA)的新方法,结合罗家地区的泥岩裂隙地震地质特征,研究了利用多方位 P 波资料检测定向垂直裂缝的地震采集、处理和识别方法,对不同共中心点 CMP 位置的全方位 P 波资料在速度随方位变化(VVA)及振幅随方位角变化(RVA)研究的基础上,进行波阻抗随方位变化(IPVA)的研究,用于识别裂缝的分布、走向及密度。经罗家地区实际资料的应用,见到了初步的效果,证明该方法是潜力较大的高角度裂隙的定量检测方法。
There is a special kind of fractured reservoirs in Shengli Oilfield, namely mudstone fractured reservoirs. Due to the small porosity of such fractured reservoirs and the petrophysical parameters of rock, which are not sensitive to changes and exhibit strong anisotropy, its exploration is very difficult. Up to now, there is not a set of mature method of identifying fracture orientation, distribution and density in the comprehensive analysis of geology, geophysical, logging and drilling data. Based on the study of the overseas fracture detection methods, this paper presents a new method of wave impedance with azimuth change (IPVA). Combined with the seismic geological characteristics of shale fractures in the Luojia area, the paper studies the detection of vertical fractures by multi-azimuth P-wave data Acquisition, processing and identification methods were used to analyze the changes of wave impedance with azimuth (IPVA) on the basis of the research on the azimuthal velocity (VVA) and azimuthal amplitude (RVA) of the CMP data at different co- ) Study to identify the distribution, orientation and density of cracks. Through the application of the actual data in Luojia area, we can see the preliminary results show that this method is a quantitative detection method for high-angle fractures with great potential.