地表-早成岩阶段发育开放-半开放成岩体系，长石溶蚀形成增孔型次生孔隙；

The surface-early diagenetic stage developed an open-semi-open diagenetic system, and feldspar dissolved to form porosity-increasing secondary pores; in the middle-late diagenetic stage, a near-closed-closed diagenetic system developed, and feldspar dissolution formed mixed-type secondary pores, associated with Cementation makes the rock more compressive, which is conducive to the effective preservation of secondary pores. The proposal of this understanding expands the formation window of secondary pores in petroliferous basins from the traditional acid-generating window to the high-temperature gas-generating window after accumulation, and rationally explains the deep-ultra-deep feldspar dissolution secondary pore-dominated window. The development mechanism of low-permeability-medium-porosity high-quality reservoirs is of great significance for expanding the field of deep-ultra-deep oil and gas exploration.

In the surface early diagenetic stage, an open semi open diagenetic system is developed, and feldspar dissolution forms pore increasing secondary pores; Near closed closed diagenetic system is developed in the middle late diagenetic stage. Feldspar dissolution forms allocated secondary pores. The associated cementation makes the rock more compressive and is conducive to the effective preservation of secondary pores. This understanding extends the formation window of secondary pores in petroliferous basins from the traditional acid generation oil generation window to the high-temperature gas generation window after reservoir formation, and reasonably explains the development mechanism of low-permeability medium porosity high-quality reservoirs dominated by deep ultra deep feldspar dissolution secondary pores, which is of great significance to expand the field of deep ultra deep oil and gas exploration.

In the stage of surface-early diagenesis, open-semi-open diagenetic system developed, and feldspar eroded to form pore-increasing secondary pores. Near-closed-closed diagenetic system developed in the middle diagenesis-late diagenesis stage. Feldspar dissolution formed mixed secondary pores, and the associated cementation made rocks have stronger compressive resistance, which was beneficial to the effective preservation of secondary pores. This recognition expands the formation window of secondary pores in oil-bearing basins from the traditional acid-oil generation window to the high-temperature gas generation window after reservoir formation, and reasonably explains the development mechanism of low permeability-mesoporous high-quality reservoirs dominated by deep-ultra-deep feldspar dissolution secondary pores, which is of great significance for expanding the field of deep-ultra-deep oil and gas exploration.