压实作用是造成砂岩孔隙度降低的最主要因素。
The mechanical compaction is the main cause of porosity loss.
泥岩压实过程中，随着孔隙度降低，孔隙中流体被排出。
Fluids in the pores will be expelled as the reduction in porosity occurs during the process of compaction of the mudstones.
压实作用和胶结作用是砂岩孔隙度降低的主要原因，分别造成22%和15%的原生孔隙丧失。
Decrease of sandstone porosity is mainly caused by compaction and cementation, which contribute 22% and 15% to the loss of primary pores, respectively.
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