Physical properties and diagenesis of the clastic rocks from the Meishan Formation in the Songnan-Baodao depression, Qiongdongnan Basin

ZHAO Yilin; MA Zunqing; CHEN Guojun; YANG Haizhang; LI Chao; TIAN Bing

Sedimentary Geology and Tethyan Geology > 2019 > 39(4): 14-26.

ZHAO Yilin, MA Zunqing, CHEN Guojun, YANG Haizhang, LI Chao, TIAN Bing. Physical properties and diagenesis of the clastic rocks from the Meishan Formation in the Songnan-Baodao depression, Qiongdongnan Basin[J]. Sedimentary Geology and Tethyan Geology, 2019, 39(4): 14-26.

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Physical properties and diagenesis of the clastic rocks from the Meishan Formation in the Songnan-Baodao depression, Qiongdongnan Basin

1. Northwest Institute of Ecoenvironment and Environments, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;
2. Key Laboratory of Petroleum Resources, Gansu Key Laboratory of Petroleum Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China;
4. Research Institute, CNOOC, Beijing 100028, China;
5. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210000, Jiangsu, China

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Received Date: August 21, 2019
Revised Date: October 11, 2019
Published Date: December 29, 2019

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Abstract

Abstract

In terms of the examination of thin sections and scanning electron photomicrographs, combined with mercury injection test, micron-scale CT Scanning technique, X-ray diffraction analysis and fluid inclusion analysis, the present paper deals with the petrological features, physical properties of the clastic rocks, diagenesis and its effects on the reservoir quality, and prediction of the potential favourable zones based on the diagenatic facies analysis for the Meishan Formation in the Songnan-Baodao depression, Qiongdongnan Basin. The clastic rocks in the study area consist dominantly of fine-grained feldspathic quartz sandstone and siltstone, with point-line contacts and grain-supported textures. The cement types contain clay minerals and carbonate minerals. The porosity types are composed of intergranular solution openings, residual intergranular solution openings and intragranular solution openings, with fine-to extra-fine throats, and mesopores and low-to extra-low permeability. The destructive diagenesis is represented by compaction and cementation while the constructive diagenesis includes dissolution. The delta front may be the potential favourable zone for the development of the effective reservoir rocks in the Meishan Formation in the study area.
- diagenesis,
- reservoir quality,
- clastic rocks from the Meishan Formation,
- Songnan-Baodao depression,
- Qiongdongnan Basin

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Physical properties and diagenesis of the clastic rocks from the Meishan Formation in the Songnan-Baodao depression, Qiongdongnan Basin

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Physical properties and diagenesis of the clastic rocks from the Meishan Formation in the Songnan-Baodao depression, Qiongdongnan Basin

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