地震Wheeler域变换结合时频分析技术用于渤海油田岩性油气藏描述

Application of Wheeler transform combined with time-frequency analysis technology to lithologic reservoir characterization of Bohai Oilfield

为研究渤海油田石臼坨凸起缓坡带A区块岩性油气藏的成藏模式、预测勘探有利区带,亟须精细刻画层序格架下沉积体系的分布形态、分析储层顶底板油气保存条件及上倾封堵条件等。首先利用时频分析技术精细划分井上体系域,再采用基于地震数据驱动的Wheeler域变换技术将井上划分结果向三维空间进行推广,快速建立精细体系域格架,进行储层预测及保存条件分析。结果表明:石臼坨凸起缓坡带紧邻秦南富烃凹陷的主洼,汇烃条件优越;区内控洼长期活动断裂与三角洲砂体共同组成复式输导网络,利于岩性油气藏成藏;缓坡带上的鼻状构造是油气运移的重要方向和轨迹,一旦上倾方向具有封堵条件即可形成油气藏。整体而言,渤海油田石臼坨凸起缓坡带A区块的保存条件及封堵条件良好,是岩性油气藏勘探的有利区带。

In order to study the reservoir accumulation model of lithologic reservoirs and find favorable explora- tion zones in block A in the gentle slope zone of Shijiutuo uplift, we need to characterize the distribution of sedi- mentary systems and analyze the preservation conditions and updip sealing conditions of oil and gas in the reser- voir top and bottom plate. This paper firstly used time-frequency analysis technology to divide the 2D sedimentary systems of wells, and then used the Wheeler transform based on seismic data to promote the results of wells to the 3D space, to promote the rapid establishment of fine sedimentary systems framework, and carried out reser- voir prediction and preservation condition analysis. The results show that： （1） adjacent to Qinnan hydrocarbon- rich generation depression, the gentle slope zone in Shijiutuo uplift has good conditions for hydrocarbon collec-tion; （2） the long-term active fault in the study area together with sand bodies in delta formed a double-type transport network, which is beneficial for the formation of lithologic reservoirs; （3） the nose-shaped structure in the gentle slope zone is an important direction and track of hydrocarbon migration, once the area in the updip di- rection has good sealing conditions, it can form oil and gas reservoirs. Overall, block A has favorable preserva- tion and sealing conditions, so it is a favorable exploration zone of lithologic reservoirs.