Formation Evaluation Of Second Section Of Jialingjiang Formation In Central Sichuan Basin

The Second Section of Jialingjiang Formation in central Sichuan Basin is a major gas producing region,with ceaselessly further exploration,we are facing the questions: finely portrayed of local sedimentary microfacies,the controlling factors and distribution law of high-quality reservoir needs to be researched etc.The complex reservoir space and strong heterogeneity because of the diagenesis of Carbonate lead great difficulties in logging interpretation.And lack of data of new technologies liking NMR logging,electrical imaging logging in this area,so it has great practical significance for supporting and guiding the oil and gas exploration of this region and other parts of Jialingjiang Formation to establish a reservoir evaluation method.In this paper,we established a logging evaluation method of sedimentary reservoir with the conventional logging evaluation technology as the core,making full use of geological data,core data,logging data and dynamic production data.Under the guidance of the theory of multi-mineral interpretation model,first,we carried out research of “relations among four properties” in this area;then,we achieved recognition of lithology and microfacies by principal component analysis and cluster analysis;finally,we setted up a suitable logging interpretation model of reservoir in this area,explored suitable method of reservoir logging evaluation for the area,further clarify the type of reservoir and fluid properties in this area.Studies have shown that,it is predominantly dolomite and gypsum rocks of the Second Section of Jialingjiang Formation in central Sichuan Basin,the reservoir is mainly made up of particles of dolomite and crystalline dolomite,the overlap method of AC-CNL logging curves is a more effective way for determining reservoir fluid properties;basically,the rank of reservoir quality is that the area of Gaomo?Penglai?Longgang and the other places;mainly is Class ? and Class ? reservoirs and fracture-pore type.The water and gas in the reservoir are associated,the larger water saturation of reservoir,gas saturation more or less corresponding increase,providing a new way of thinking for the study of the Second Section of Jialingjiang Formation.