Based on the Reservoir Architecture of the Remaining Oil Reservoir Fine Characterization and Potentialities: A Case of the Oil Layer of the Lower ED2 of Dongying Formation in Bohai L Oilfield

doi:10.3969/j.issn.1006-396X.2021.05.006

Abstract

Abstract:

Bohai L oilfield has undergone multiple adjustments since it was exploited, such as well pattern internal infilling, changing well patterns, and reversing lines. The scattered distribution of remaining oil on the flat and extremely complicated vertical flooding law resulted in difficulty for tapping the remaining oil. Based on the data of core, well logging, seismic, production dynamic and other results, the thick reservoir can be comprehensively characterized, so as to guide the remaining oil fine characterization and potential development. The results show that the plane contact styles of single sand body is mainly in butt type, and the vertical overlap mainly in cut type. The remaining oil of the southern vertical accretion type leaf body is mainly concentrated near the vicinity of the fault, the buried hill area and the sand?body deposition margin, which can be tapped using directional wells. The remaining oil of the central prophase frond is mainly concentrated in the top of the thick sand body and the lower part of the thin interbe, which can be tapped using horizontal wells.

Key words: Thick reservoir, Reservoir architecture, Remaining oil, Characterization, Potential tapping strategy

摘要：

渤海L油田从投入开发，经历了内部加密、变井网、转流线等多轮次调整，平面剩余油分布零散，纵向水淹规律异常复杂，剩余油挖潜难度大。综合应用岩心、测井、地震、生产动态等资料，对厚层油藏储层进行精细刻画，指导剩余油精细表征和挖潜。研究发现，该油田单砂体平面以对接式为主，纵向叠置以切叠式为主，南部垂向加积型朵叶体剩余油富集在断层附近、潜山围区、砂体沉积边部，可部署定向井挖潜，中部前积型朵叶体剩余油富集在厚砂体顶部及薄夹层下部，可部署水平井挖潜。

关键词: 厚层油藏, 储层构型, 剩余油, 表征, 挖潜策略

CLC Number:

TE122

Bin Zheng, Xinwu Liao, Zongbin Liu, Yujuan Liu, Jing Zhang, Zhiming Yan. Based on the Reservoir Architecture of the Remaining Oil Reservoir Fine Characterization and Potentialities: A Case of the Oil Layer of the Lower ED2 of Dongying Formation in Bohai L Oilfield[J]. Journal of Petrochemical Universities, 2021, 34(5): 36-42.

郑彬, 廖新武, 刘宗宾, 刘玉娟, 张静, 闫志明. 基于储层构型的剩余油精细表征方法及挖潜策略——以渤海L油田东营组东二下亚段油层为例[J]. 石油化工高等学校学报, 2021, 34(5): 36-42.

Figures/Tables 8

Fig.1 Paleogeomorphologic map of sedimentary time of II oil layer group in Bohai L oilfield

Fig.2 Three lobes of braided river delta front and the plane distribution pattern of sand body in Bohai L oilfield

Fig.3 Vertical sand body superimposition pattern in thick sand body of Bohai L oilfield

Fig.4 Vertical aggradation architecture of thick sand body and vertical remaining oil type in infill wells in Bohai L oilfield

Fig.5 II?1?1 single sedimentary microfacies in Bohai L oilfield

Fig.6 Different plane configuration unit injection-production contact pattern in Bohai L oilfield

Fig.7 The occurrence pattern of remaining oil in Bohai L oilfield

Fig.8 Injection and production curve of A35 well group in Bohai L oilfield

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