深水峡谷上游复合浊积砂岩储层类型及其展布规律

doi:10.11743/ogg20240215

Abstract

Abstract:

The Lingshui gas field， located in the upper reach of the Central Canyon in the Qiongdongnan Basin， shows the occurrence of turbidite sandstones. However， the turbidite sandstone reservoirs of diverse types， jointly affected by both sedimentation and diagenesis， present challenges in characterization. This study aims to forecast the distribution of favorable reservoirs in the deep-water areas of the Lingshui gas field. Based on the morphologies and burial depths of the Central Canyon， we categorize the upper reach of the canyon head into the adjustment section， the low-tortuosity section， and the curved section. This division allows for a detailed examination of the reservoirs’ fracture and filling types in the reservoirs. Furthermore， we analyze the deposition and origin of the reservoir rocks based on the quantitative relationships between rock fabric and physical properties. The results indicate that the adjustment section is dominated by coarse-grained gravity flow deposits， with reservoir physical properties gradually improving downstream as the intergranular matrix content declines. The low-tortuosity section is primarily composed of fine-grained to silty turbidite sand bodies， with grain sizes marginally varying along the canyon and cementation emerging as a factor affecting the quality of reservoirs consisting of alternating thin- and thick-bedded sandstone. The curved section principally comprises silty turbidite sand bodies， with reservoir physical properties gradually deteriorating downstream with an increase in the burial depth. Therefore， it can be inferred that the reservoir quality is governed by the sedimentary process in the adjustment section and the diagenesis in the low-tortuosity and curved sections.

Key words: convergence area of the Central Canyon, architecture hierarchy, physical property distribution, turbidite sand body, Qiongdongnan Basin

CLC Number:

TE122.2

Chao FU, Yuhong XIE, Yuchu ZHAO, Hui WANG, Zhiwang YUAN, Wei XU, Guoning CHEN. Types and distribution patterns of complex turbidite sandstone reservoirs in the upper reaches of deep-water canyons—A case study of the Lingshui gas field in the Central Canyon of Qiongdongnan Basin[J]. Oil & Gas Geology, 2024, 45(2): 516-529.

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峡谷分段	平均坡降/（°）	下切深度/m	峡谷宽度/m	沉积充填类型	峡谷弯曲度/（°）
调整段	0.3	50	150	滑塌体、粗粒浊积水道	3～5
顺直段	0.6	20	100	细粒浊积水道	1～2
弯曲段	0.1	30	120	细粒浊积水道	15

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Types and distribution patterns of complex turbidite sandstone reservoirs in the upper reaches of deep-water canyons—A case study of the Lingshui gas field in the Central Canyon of Qiongdongnan Basin

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