Title: BULLETIN OF GEOLOGY, VOL. 3 , NO. 1 , 201 9 279 D OI: 10.5614/bull.geol.2019.3.1. 2 STUDI DIAGENESIS BATUPASIR PADA ASOSIASI FASIES CHANNEL - FILL FORMASI HALANG
Abstract: Diagenesis in the channel-fill facies association shows the process of compaction, cementation, recrystallization, and dissolution.The compaction process on channel-1 and channel-2 is characterized by the presence of inter-granular contacts in the form of point, long, and suture contacts.The degree of compacting increases in the sample taken on the channel basis.In channel-1 there is recrystallization of the glass into clay minerals and recrystallization of quartz, whereas in channel-2 only recrystallization of the glass into clay minerals.Dissolution that occurs in channel-1 is the dissolution of pyroxene minerals, plagioclase and foraminifera shells, and in channel-2 only dissolution of pyroxene minerals.The addition of clay minerals during diagenesis takes place reducing porosity value, because clay minerals can fill the space between the granules forming rocks, so the Halang Formation sandstones have a low potential as a hydrocarbon reservoir.