Cycle-Time Challenges for Geophysics in the Evaluation of a Tight Gas Pilot Project – Example from South Sulige Permit, Sulige Field, Ordos Basin, China

Historically, well targeting in tight gas reservoir plays has<br>focused on ‘sweet spots” (e.g. high net-to-gross, high Sg,<br>natural fractures, etc) which aim to highlight areas of<br>increased productivity. On Sulige, reservoir and<br>productivity predictions have rarely been straightforward<br>(no natural fracturing, complex diagenetic history) and the<br>already-producing wells by Petrochina on North Sulige<br>more often than not need mechanical stimulation (i.e.<br>hydraulic fracturing) to maintain prolonged production in<br>the low permeability, fluvial sandstones.