| 深埋藏致密砂岩中相对优质储层形成机理——以川西坳陷新场构造带须家河组为例 |
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| 关键词:tight sandstones with deep burial relatively high-quality reservoir formation mechanism Western Sichuan depression Xujiahe Formation |
| 基金项目:国家科技重大专项(编号: 2016ZX05033-001-002); 中国石油科技创新基金项目(编号: 2014D-5006-0108) |
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| The Formation Mechanism of the Relatively High-quality Reservoir in Tight Sandstones with Deep Burial: A Case Study of Xujiahe Formation in Xinchang Structural Belt of Western Sichuan Depression |
| In the Xinchang structural belt of the middle part of the western Sichuan depression, the sandstones of the Xujiahe Formation which belong to the ultra-tight sandstones with the deep burial and complicated diagenesis are mainly distributed in the second and fourth member of Xujiahe Formation. However, the tight sandstone gas reservoirs of the Xujiahe Formation were formed in the relatively high-quality reservoirs and proved to be the important gas exploration targets in the western Sichuan depression. For efficient predicting and extrapolating the tight sandstone gas reservoirs, the formation mechanism of relatively high-quality reservoirs need to be better understood. Based on the research on petrology, reservoir characteristics and diagenesis, the authors used thin-section analysis, physical property measurement, scanning electron microscope analysis, cathodoluminescence, X-ray diffraction analysis, homogenization temperatures of fluid inclusions and electron microprobe analysis to investigate material composition, texture feature, early cementation, interaction of fluid and rock, tectonic activity, hydrocarbon generation-expulsion history and their impact on the preservation of the remains of primary pores and the formation of secondary pores, so as to systematically study and understand the formation mechanism of the relatively high-quality reservoirs in the tight sandstones of the Xujiahe Formation and provide the important basis for the prediction of favorable reservoirs. The research results show that the formation mechanism of relatively high-quality reservoirs mainly consisted of the preservation of the residual primary pores and the formation of the secondary pores. The former included the protection of the early chlorite rim and calcite cement, and the early injection of hydrocarbon created by some fractures, whereas the formation of the secondary pores was generated by the interaction of fluid and rock dominated by the dissolution of feldspar and a little unstable rock debris, and was produced or enlarged by the fractures. |
| LUO Long,GAO Xian-zhi,MENG Wan-bin,TAN Xian-feng,FENG Ming-shi,SHAO Heng-bo.2017.The Formation Mechanism of the Relatively High-quality Reservoir in Tight Sandstones with Deep Burial: A Case Study of Xujiahe Formation in Xinchang Structural Belt of Western Sichuan Depression[J].Acta Geoscientica Sinica,38(6):930-944. |
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