【摘要】 在莺歌海盆地,随着勘探走向中深层和高温高压领域,利用地震资料进行常规的亮点、AVO、叠前反演等对储层预测、含气性检测出现了精度大幅降低或失灵的情况。为了研究高温高压地层的地震响应特征,有效地解决盆地内高温高压储层的预测和含气性检测问题,通过多砂体精细属性分析,总结了影响本区地震响应的6大主要因素,分别是浅层气及泥底辟、泥岩盖层、砂体耦合、储层厚度、储层物性和储层的含气饱和度。研究中采用了岩石物理分析、地震正演、精细建模的叠前叠后反演等技术,并在此基础上开展了对各种地震信息的分析,然后将各种影响因素一一剥离,以达到去伪存真的目的,最后得到不同条件下地震属性异常所代表的储层厚度、物性及含气性等数据,实现了地震信息与气藏信息的有效对应,达到了预测储层及其含气性的目的。实钻结果表明,利用地震信息剥离技术开展的中深层高温、高压储层预测和含气性检测的精度较高,取得了良好的勘探效果。更多还原

【Abstract】 Up till now,gas exploration has come to the middle and deep strata under high temperature and high pressure in the Yinggehai Basin,and the conventional methods based on seismic data like Spotlight,AVO,Prestack Inversion,etc.have been questioned by a sharp decline of accuracy or even failures in either reservoir prediction or gas-bearing inspection.In view of this,this paper first analyzes the characteristics of seismic response from the HPHT strata in this study area.Through a fine description of multi-sandbody seismic attributes,6 major factors affecting the seismic response in this study area are thus summarized: shale gas/mud diaper,mudstone caprocks,sandbody coupling,reservoir thickness,reservoir petrophysical properties,and gas saturation of reservoirs.Then,by use of seismic techniques like rock physical analysis,seismic forward modeling,fine modeling of prestack and poststack inversions,and so forth,this paper makes a deep investigation into all kinds of seismic data and from which such sufficiently genuine factors are discovered as the thickness,petrophysical properties,and gas saturation of reservoirs through the abnormality of seismic attributes under various conditions.In this way,effective correspondence between seismic data and the information of gas reservoirs is achieved and finally both gas reservoirs and their gas saturation are predicted accurately.The actual drilling results demonstrate that this study provides a good seismic prediction method with a high accuracy rate for gas exploration in this area.更多还原