Oil-Well Data Interpretation Using Expert System and Pattern Recognition Technique

T h i s pape r d e s c r i b e s a p rog ram f o r i n t e r p r e t a t i o n o f o i l w e l l m e a s u r e m e n t s . Two t e c h n i q u e s have been merged f o r t h i s p u r p o s e : t h e e x p e r t sys tem t e c h n i q u e ( p r o d u c t i o n r u l e s ) w h i c h l e n d s i t s e l f t o t h e s y m b o l i c r e a s o n i n g a s p e c t o f t h e p r o b l e m and p a t t e r n r e c o g n i t i o n t e c h n i q u e ( m a i n l y t h e s p l i t and merge a l g o r i t h m ) t o i n t e r p r e t c u r v e s m e a s u r i n g p h y s i c a l p r o p e r t i e s o f r o c k s . P a r t o f t h e know ledge o f a n e x p e r t i n g e o l o g y has been coded i n t o 500 p r o d u c t i o n r u l e s t o g e t h e r w i t h h i e r a r c h y t r e e s ( such a s p e t r o g r a p h y , p a l e o n t o l o g y ) w h i c h a l l o w t h e p rog ram a n a c c e s s t o t h e r u l e s c o n t a i n i n g a s s e r t i o n s more g e n e r a l t h a n t h e i n p u t d a t a . T h e r e a r e t w o g e o l o g i c a l l a w s u n d e r l y i n g t h e d e s i g n o f t h e p r o g r a m : (1) A l l s o u r c e s o f d a t a a r e a c c o u n t e d f o r whenever t h e y a r e a v a i l a b l e , (2) A d e s c r i p t i o n o f a r o c k has no s i g n i f i c a n c e o u t o f i t s c o n t e x t , w h i c h means t h a t t h e i d e n t i f i c a t i o n o f r o c k s must b e g u i d e d b y t h e know ledge o f t h e e n v i r o n m e n t a l c o n d i t i o n s . A s e s s i o n w i t h LITHO i s p a r t i a l l y d i s p l a y e d .