Reservoir Characteristics of Buried-hill Draping Zone in L Oilfield, Offshore China

Yujuan Liu, Qianping Zhang, B. Zheng, Jing Zhang, Zhaozhao Qu
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Abstract

The reservoir in different parts of buried-hill draping zone is often quite different, so it is of great significance to clarify the reservoir characteristics for exploration and development. Based on core, well logging, seismic data and production data, reservoir characteristics of oil layer Ⅱ in the lower second member of Dongying Formation of L oilfield, Bohai Bay Basin, offshore eastern China are systematically studied. Analyses of seismic facies, well-seismic combination, paleogeomorphology, and sedimentary characteristics are carried out. Sediment source supply, lake level and buried hill basement geomorphology all contribute to reservoir quality. The research suggests that the different parts of buried-hill draping zone can be divided into four types. Reservoir thickness and physical properties vary. The area where the provenance direction is consistent with the ancient valley direction is a favorable location for the development of high-quality reservoirs. Under the guidance of the results, oilfield production practices in L oilfield offshore China are successful. Knowledge gained from study of L oilfield has application to the development of other similar fields.
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中国海上L油田潜山覆盖带储层特征
潜山覆盖带不同部位的储层往往差异较大,因此弄清储层特征对勘探开发具有重要意义。基于岩心、测井、地震和生产资料,对渤海湾盆地L油田东营组下二段Ⅱ油层储层特征进行了系统研究。对地震相、井震组合、古地貌、沉积特征进行了分析。沉积物来源、湖泊水位和潜山基底地貌都对水库质量有影响。研究表明,潜山覆盖带不同部位可划分为4种类型。储层厚度和物性各不相同。物源方向与古河谷方向一致的地区是优质储层发育的有利位置。在此成果的指导下,中国海上L油田的生产实践取得了成功。从L油田的研究中获得的知识可以应用于其他类似油田的开发。
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