东营北带东部盐下深层砂砾岩体有效储层地震识别

Seismic identification of effective reservoirs for the subsalt deep glutenite in the east of Northern Dongying Sag

中国石油化工股份有限公司胜利油田分公司物探研究院,山东东营257022

Wang Shugang, Geophysical Research Institute,Shengli Oilfield Branch Company,SINOPEC,Dongying 257022,China

东营北带东部盐下砂砾岩体具有良好的深层气成藏条件,然而由于沉积期次划分不明确、常规的储层预测方法缺乏针对性等因素的制约,使得该区带深层气的勘探一直徘徊不前。在地质分析的基础上,开展了有针对性的储层精细预测技术研究。首先应用小波变换时频分析技术对砂砾岩体的沉积期次进行了精细划分;然后通过三维平均速度场的建立落实了各期次砂砾岩体的构造特征;最后在岩石物理分析的基础上,利用叠前弹性参数反演对各期次砂砾岩体的有效储层发育区进行了量化预测。初步形成的针对性砂砾岩体有效储层精细预测技术系列取得了较好的应用效果,预测东营北带东部深层砂砾岩体有利圈闭天然气资源量246×108m3。

The subsalt glutenite in the east of Northern Dongying Sag has good accumulation conditions for deep gas.However,restricted by the ambiguous classification of sedimentary periods and lacking specificity of conventional reservoir prediction techniques,the exploration for deep gas in this area is lingered.Recently,targeted fine reservoir prediction techniques are studied which is based on geologic analysis.Firstly,wavelet transform timefrequency analysis technique is applied to classify the sedimentary periods of glutenite in detail.Then,the structure characteristics of the glutenite are identified by constructing a 3D average velocity field.Finally,on the basis of petrophysical analysis,the effective reservoirs for the subsalt deep glutenite are quantitatively predicted by prestack elastic parameter inversion.By applying this series of fine reservoir prediction technology,the resource amount of favorable trap natural gas resources for this area is predicted about 246×108 m3.

10.3969/j.issn.10001441.2013.05.016