The Jade Fieldi sl ocated inBlock 30/2ci nt he UK CentralNorthS ea andwasdiscovered byw ell 30/2c-3in1 996. Itw ast henappraised byw ell 30/2c-4 in1 997,withfi rst production in2 002. The decision to develop the fieldafteronly oneappraisalwell led to adegree ofuncertainty inthe fieldreservesandestimated production profiles. Consequently,the development programmewasdesigned to include anelement off urther appraisal. The development planincluded simultaneous drillingandproduction operationssoreservoirpressure depletion,dueto production,wasrecognized asasignificant projectchallenge.Detailed contingencyplans were formulated to ensurethatwell objectiveswereachieved, despitethe potentially problematic reservoirconditions. The fieldproducesgasandc ondensatef rom the Triassic Joannea ndJ udySandstonesandi sclassified asa high-pressure, high-temperaturefield, withawetgas-in-place estimatefor the JoanneSandstoneofaround1000 BCF andfor the JudySandstoneof150BCF.Thispaperoutlinesthe petroleum geologyanddevelopment history ofthe fieldandthe current understandingofthesecomplexreservoirs.

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