莺-琼盆地轴向水道沉积演化及勘探前景

doi:10.11885/j.issn.1674-5086.2015.12.31.01

摘要/Abstract

摘要： 莺琼盆地在莺歌海期和黄流期发育大规模的轴向水道沉积体系，但由于对这种轴向水道的成因机制及水道砂体的分布规律缺乏系统认识，勘探一直未能取得商业性突破。针对制约轴向水道沉积体系勘探的物源和储层展布问题，以最具代表意义的轴向水道——琼东南盆地中央峡谷为例，应用地质与地震相结合分析技术、多属性融合技术、适用于峡谷水道体系的地震沉积学等，开展了具有针对性的物源体系、沉积演化、储层展布等方面的研究，阐明了中央峡谷水道的物源、沉积演化及优质储层展布规律，建立了具有储层预测功能的峡谷沉积模式及水道砂叠置方式，指出乐东10-1峡谷水道等4个潜在的大型岩性圈闭群是轴向水道领域的下一步勘探有利区域，提升了轴向水道勘探潜力。

关键词: 莺琼盆地, 轴向水道, 中央峡谷, 充填演化, 储层展布

Abstract: Channel sandstone is the most important oil and gas reservoir type in deep-water sedimentary systems. A large-scale axial channel deposition system is present in the Yinggehai and Huangliu Formations in the Ying-Qiong Basin. Axial channels are considered an important area for oil and gas exploration in the Ying-Qiong basin, and are valued by domestic and international companies. However, due to a lack of systematic understanding of the formation mechanism and distribution of sandstones in such axial channels, exploration thus far has been unable to yield a commercial breakthrough. This study aimed to resolve issues of provenance and reservoir distribution, which have restricted the exploration of axial channel depositional systems. The central valley, which is the most representative axial channel in the Qiongdongnan Basin, was taken as an example. Combined geological and seismic analysis, multi-attribute integration technology, seismic sedimentology, and other new technologies suited to canyon channel systems were applied in this study. We then carried out targeted research on the provenance system, sedimentary evolution, and reservoir distribution, thereby clarifying the provenance, sedimentary evolution and quality reservoir distribution patterns of the central valley channel. We have also established a sedimentation model and channel sandstone superimposition method for the central valley, which could be used to predict the structure of the reservoir. Our results revealed the existence of four potential large lithologic traps, such as in the Ledong 10-1 Valley channel. These areas are favorable for the next step of exploration of axial channels, thus greatly enhancing their exploration potential.

Key words: Ying-Qiong Basin, axial channel, central valley, filling evolution, reservoir distribution

中图分类号:

TE122

何小胡, 张迎朝, 张道军, 陈杨, 黄灿. 莺-琼盆地轴向水道沉积演化及勘探前景[J]. 西南石油大学学报(自然科学版), 2017, 39(3): 66-76.

HE Xiaohu, ZHANG Yingchao, ZHANG Daojun, CHEN Yang, HUANG Can. Sedimentary Evolution and Exploration Prospects of Axial Channel in Ying-Qiong Basin[J]. 西南石油大学学报(自然科学版), 2017, 39(3): 66-76.

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