深水局部限制型水道复合体沉积特征及其对储层性质的影响——以东非鲁武马盆地始新统为例

doi:10.11743/ogg20210618

Abstract

Abstract:

The Eocene channel sandstone reservoirs in the Rovuma Basin, East Africa, are of deep sea gravity flow deposits. The Eocene channel complex is characterized by unilateral migration and multi-level erosion and filling. Research methods and technologies including core observation, well logging analysis, and 3D seismic attribute analysis, etc., are applied to study the channel complex. The relationship between the sedimentary facies of channel complex and its grade is clarified. The Eocene channel complex of locally restricted type can be divided into 3 subfacies, 3 grades and 4 sedimentary periods; moreover, the evolutionary process of the 4 periods is described, and the impact of sedimentary unit type, sedimentary period of the channel complex and the distance from the channel mouth on the reservoir properties is analyzed. The Eocene channel complex in the Rovuma Basin is composed of 3 sedimentary subfacies, i.e. complex substrate, main deposits of confined filling and overflow wedge. Channel filling deposition includes 3 grades of channel complex, composite channel and channel. Under the influence of bottom current, a north-to-south migration occurs within a single composite channel and between composite channels of different stages from old to young; and thereby the reservoir is mainly of the superimposing channel facies in laterally continuous distribution. On the other hand, the reservoir properties of the Eocene channel complex of local restriction type are closely associated with the sedimentary period, the type of sedimentary units and the distance from the channel mouth. Sandstone reservoirs are mainly developed in superimposing and meandering channels, and the superimposing channel facies is the most favorable to reservoir development. The earlier the channel deposition occurs, the thicker a single sandstone layer will be; however, the later the channel deposition begins, the better the physical properties of a reservoir will be, and the closer to the channel mouth, the greater the reservoir thickness and the lower the porosity will be. The variation of shale content and permeability with extension distance is complicated. In a nutshell, the research results serve for deepening the study of sedimentary reservoir of deep-water channel complex facies, as well as are of practical value to establishing geological models in the early stage of oil/gas field development.

Key words: composite channel, channel complex, deep-water deposits, reservoir characteristics, Eocene, Rovuma Basin

CLC Number:

TE122.2

Hui Sun, Guozhang Fan, Dali Shao, Guoping Zuo, Shaozhi Liu, Hongping Wang, Hongxia Ma, Xiaoyong Xu, Yintao Lu, Chun Yan. Depositional characteristics of locally restricted channel complex in deep water and its influence on reservoir properties: A case study of the Eocene series, Rovuma Basin[J]. Oil & Gas Geology, 2021, 42(6): 1440-1450.

Figures/Tables 11

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完整事件层	岩心厚度/m	岩心分析		测井					地震
完整事件层	岩心厚度/m	孔隙度/ %	渗透率/（10^-3μm²）	GR/ API	RT/（Ω·m）	DT/（μs·ft^-1）	RHOB/（g·cm^-3）	备注	描述
上事件层	10.3	19.92	1127.0	54.0	140.0	89.6	2.28	事件层之间具有较高伽马值、高密度特征，异于上、下层	较强振幅，低频，上、下层无反射界面
下事件层	8.7	21.10	1251.5	55.0	145.0	90.0	2.24
平均值	9.5	20.51	1189.0	54.5	142.5	89.8	2.26

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Depositional characteristics of locally restricted channel complex in deep water and its influence on reservoir properties: A case study of the Eocene series, Rovuma Basin

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