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The gas reservoir in the second member of Dengying Formation of Pengtan 1 well is located on the Northern Slope of Gaomo Paleo-uplift, that is an ultra-deep old algae-rich dolomite formation in Sichuan Basin. Due to the development of a large number of dissolution holes in the algae-rich dolomite formation, more than one million cubic meters of high-yield wells have been obtained in many wells, and the test production effect is good. The second member of Dengying Formation can be divided into two sub-members. The lower sub-member develops algae-rich pore dolomite, and the upper sub-member is dissolved pore-type crystalline dolomite. According to the characteristics of reservoir space and lithology, ten types of reservoir types are divided, which are cavernous reservoirs，fractured-vuggy reservoirs 1, vuggy reservoirs 1, fractured-porous reservoirs 1, porous reservoir 1, fractured-vuggy reservoirs 2, vuggy reservoirs 2, fractured-porous reservoirs 2, porous reservoir 2 and fractured reservoirs. In the crystalline dolomite, there are five types: cavernous reservoirs, fractured-vuggy reservoirs 1, vuggy reservoirs 1, fractured-porous reservoirs 1 and porous reservoir 1. In the algae-rich dolomite formation, there are four types of fractured-vuggy reservoirs 2, vuggy reservoirs 2, fractured-porous reservoirs 2, porous reservoir 2. It is mainly fractured reservoirs in tight dolomite strata. The fractured-vuggy and vuggy reservoirs are high-quality reservoirs. On the basis of the favorable sedimentary facies of the mound-shoal facies, the second member of Dengying Formation was uplifted by the three-stage Tongwan movements, and formed a pore-type karst reservoir after dissolution and transformation in the supergene period. The high-quality reservoirs are mainly distributed in the karst paleo-topography and the horizontal subsurface flow zone. The reservoirs in the 2 and 3 sub-layers of the upper sub-member are continuously and stably distributed in the horizontal direction, which is the main development layer at present.

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Analysis on the Characteristics and Controlling Factors of Karst Reservoirs in the Second Member of Dengying Formation in Penglai Gas Area

  • 会议论文

  • 发表日期：

    2025年

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  • Lin Zhang,
  • Chun Zhang,
  • Jun Jiang,
  • Zhen-hua Guo,
  • Jun-ying Liu

摘要

The gas reservoir in the second member of Dengying Formation of Pengtan 1 well is located on the Northern Slope of Gaomo Paleo-uplift, that is an ultra-deep old algae-rich dolomite formation in Sichuan Basin. Due to the development of a large number of dissolution holes in the algae-rich dolomite formation, more than one million cubic meters of high-yield wells have been obtained in many wells, and the test production effect is good. The second member of Dengying Formation can be divided into two sub-members. The lower sub-member develops algae-rich pore dolomite, and the upper sub-member is dissolved pore-type crystalline dolomite. According to the characteristics of reservoir space and lithology, ten types of reservoir types are divided, which are cavernous reservoirs，fractured-vuggy reservoirs 1, vuggy reservoirs 1, fractured-porous reservoirs 1, porous reservoir 1, fractured-vuggy reservoirs 2, vuggy reservoirs 2, fractured-porous reservoirs 2, porous reservoir 2 and fractured reservoirs. In the crystalline dolomite, there are five types: cavernous reservoirs, fractured-vuggy reservoirs 1, vuggy reservoirs 1, fractured-porous reservoirs 1 and porous reservoir 1. In the algae-rich dolomite formation, there are four types of fractured-vuggy reservoirs 2, vuggy reservoirs 2, fractured-porous reservoirs 2, porous reservoir 2. It is mainly fractured reservoirs in tight dolomite strata. The fractured-vuggy and vuggy reservoirs are high-quality reservoirs. On the basis of the favorable sedimentary facies of the mound-shoal facies, the second member of Dengying Formation was uplifted by the three-stage Tongwan movements, and formed a pore-type karst reservoir after dissolution and transformation in the supergene period. The high-quality reservoirs are mainly distributed in the karst paleo-topography and the horizontal subsurface flow zone. The reservoirs in the 2 and 3 sub-layers of the upper sub-member are continuously and stably distributed in the horizontal direction, which is the main development layer at present.