A$.1.$

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P$.$etro.leum re$.$se$.$r$.$voir is dis.co$.$vered at $3000$ psia a$.$nd $130$F$.$ If th$.$e re$.$serv.oir fluid is repr.e$.$sen$.$ted by the pha.se dia.gram of Diagran $1,.$wil.l the res.er$.$voir con.tain li$.$qui.d or g$.$as$?$ Wh$.$at abo.ut the fl$.$uid of diagram $2?$ Which of the $4$ fl$.$ui$.$ds will ex$.$hi$.$bit re$.$tro.grade be$.$ha$.$vior at re$.$ser.voir con.di$.$tions?

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Diagram $1$

Diagram $2$