Petroleum Science >2009,??Issue 4:??354-365 DOI: https://doi.org/10.1007/s12182-009-0055-3
Alkaline diagenesis and its genetic mechanism in the Triassic coal measure strata in the Western Sichuan Foreland Basin, China Open?Access
文章信息
作者：Jiang Zaixing,Qiu Longwei and Chen Guiju
作者單位：
College of Energy, China University of Geosciences, Beijing 100083, China;College of Earth Resources and Information, China University of Petroleum, Shandong 257062, China;Sinopec Exploration and Production Research Institute, Beijing 100083, China
投稿時間：2009-01-06
引用方式：Jiang, Z., Qiu, L. & Chen, G. Pet. Sci. (2009) 6: 354. https://doi.org/10.1007/s12182-009-0055-3
文章摘要
The reservoir of the upper Triassic Xujiahe Formation (T3x) in the Western Sichuan Foreland Basin is a set of terrigenous clastic rocks in an environment of coal measure sediments. Diagenesis greatly controls the physical properties of the reservoir through different responses of minerals to acidic and alkaline diagenetic environment. The dissolution of unstable components such as feldspar, rock fragments, carbonate cement, and clay minerals is the major source of secondary pores under acidic diagenesis, while the dissolution of quartz increases the reservoir space in the fault-fold zone of Longmen Mountain and Leikoupo paleo-hills. The dissolution of quartz is a result of cross-formation flow of fluid in the Himalaya epoch and the invasion of alkaline formation water from the Triassic Leikoupo and Jialingjiang formations through fault and fracture systems. In the vertical succession, acidic dissolution occurs at a shallow depth of less than 2,180 m, and alkaline dissolution occurs at a greater depth of more than 2,280 m. The reservoir space is formed by the inluence of both acidic and alkaline dissolution in the depth interval of 2,180-2,280 m.
關鍵詞
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Sichuan Basin, upper Triassic, alkaline diagenesis, porosity, genetic mechanism