基于分频CMY融合技术的储层分级构型及沉积相刻画——以西湖凹陷A构造花港组为例

Reservoir Hierarchical Architecture and Sedimentary Facies Characterization Based on Frequency-division CMY Fusion Technique:A Case Study of Huagang Formation in Structure A of Xihu Sag

近年来勘探研究表明,西湖凹陷A构造花港组H3a砂层组具备发育规模油气藏的潜力。但由于储层纵横向非均质性强、河道展布特征刻画难度大,严重阻碍了本区勘探开发进程。基于源—汇体系,利用分频CMY融合技术,对西湖凹陷A构造H3a砂组层砂体发育特征开展研究。在A构造花港组H3a砂层组识别出两期河道,其中早期河道广泛发育,晚期河道发育相对局限,仅见于研究区东部;A构造H3a砂层组整体表现出“准平原化”的特点,三角洲开始大规模由北向南快速推进,三角洲平原范围可推进至B-2井区以南,呈现大平原小前缘特征。研究结果表明,在源—汇系统约束下,利用分频CMY融合技术,能有效地提高砂体叠置区河道识别能力,更精确地刻画出河道期次及展布形态,对研究区下一步勘探开发提供参考。

Recent exploration studies show that the H3a sand formation of Huagang Formation has the potential to develop large-scale oil and gas reservoirs.But the heterogeneity of the reservoirs in vertical and horizontal direction is strong,and it is difficult to characterize the channel distribution characteristics,which seriously hinders the exploration and development process in this area.Under the constraint of source-sink system,the development characteristics of H3a sand layer in structure A of Xihu sag are studied by using frequency-division CMY fusion technology.Two stages of river channels are identified in the H3a sand group of structure A,among which the early river channels are widely developed,and the late river channels are relatively limited,which are only found in the eastern part of the study area.The H3a sand layer of structure A shows the characteristics of quasi-plainization as a whole.The delta began to advance rapidly from north to south on a large scale,and the delta plain can be advanced to the south of B-2 well area,showing the characteristics of large plain and small front.The results show that under the constraint of the source-sink system,the frequency-divided CMY fusion technology can effectively improve the channel identification ability of the sand body superposition area,and more accurately depict the channel period and distribution pattern.It has important guiding significance for the next exploration in the study area.