Changes

Mechanical compaction during the early diagenetic phase reduced porosity and permeability through increased grain packing, displacement and rearrangement of the detrital fragments, plastic deformation of the ductile mud intraclasts to pseudo matrix as well as bending and squeezing of Biotite between rigid grains. The overall small amounts of early diagenetic cements rendered compaction to be more important than cementation in reducing porosity and permeability (figure 11).

Mechanical compaction during the early diagenetic phase reduced porosity and permeability through increased grain packing, displacement and rearrangement of the detrital fragments, plastic deformation of the ductile mud intraclasts to pseudo matrix as well as bending and squeezing of Biotite between rigid grains. The overall small amounts of early diagenetic cements rendered compaction to be more important than cementation in reducing porosity and permeability (figure 11).

[[File:Sandstone-Fig-11.png|thumb|300px|Figure 11: Plot of intergranular volume (%) versus cement (%) for the Jurassic-Triassic fluvio- deltaic sandstones with a depositional intergranular volume of 40% (after Li Renwei et al<ref>Li Renwei, Lu Jiacan, Zhang Shukun et al. (1999). Organic carbon isotopic composition in black shales of Sinian and early Cambrian. (6th edition), vol.42, Science in China, pp.595-603.</ref>).]]

[[File:Sandstone-Fig-11.png|thumb|300px|Figure 11: Plot of intergranular volume (%) versus cement (%) for the Jurassic-Triassic fluvio- deltaic sandstones with a depositional intergranular volume of 40% (after Li Renwei et al<ref>Li Renwei, Lu Jiacan, Zhang Shukun et al., 1999, Organic carbon isotopic composition in black shales of Sinian and early Cambrian. (6th edition), vol.42, Science in China, pp. 595-603.</ref>).]]





====Effect of cementation on reservoir quality====

====Effect of cementation on reservoir quality====