四川盆地大庆油田探区油气勘探进展及前景OA

The Daqing Oilfield exploration area(Daqing exploration area for short)in the Sichuan Basin vertically develops over 16 marine and continental target strata,with less than 7%gas reserves proved,suggesting enormous exploration potential.To fully tap into the potential of oil and gas resources and improve the quality and efficiency of exploration and development,Daqing Oilfield has carried out systematic research targeting the Hechuan-Tongnan and Yilong-Pingchang blocks.By continuously deepening the understanding of regional geology,focusing on key technical challenges,and promoting the transformation and upgrading of exploration and development models,the oilfield has realized a leap from"strategic three-dimensional exploration"to"efficiency concentrated exploration"and a shift from"development pilot tests"to"large-scale profitable development".Systematic investigation has been conducted centering on three key domains:conventional gas in the Middle Permian Maokou Formation,tight gas in the Upper Triassic Xujiahe Formation,and shale oil in the Middle Jurassic Lianggaoshan Formation.The following results are obtained.(i)In terms of conventional gas in marine carbonates,a ternary reservoir-controlling model of"shoal facies+karstification+dolomitization"is established for the Maokou Formation,with proved gas reserves of 2 132×108 m3 submitted cumulatively,laying a resource base for a trillion-cubic-meter gas province.(ii)In terms of tight gas,a vertical multi-layer stereoscopic hydrocarbon accumulation model is constructed for the Xujiahe Formation,with three major enrichment zones showing prospective resource potential of 1.6×1012 m3 of gas,expected to become another new reserve growth target on a scale of 1 000×108 m3 following the Maokou Formation.(iii)In terms of shale oil,further research on source-reservoir coupling is conducted for the Lianggaoshan Formation,with possible shale oil reserves of 9 032×104 t submitted for the first time,breaking new ground in Jurassic shale oil exploration.Shale oil in this formation is expected to achieve 100-million-ton-scale growth in reserves,making it a practical option for large-scale oil exploration in the Sichuan Basin.It is concluded that the exploration in the three key domains has achieved remarkable results,not only providing a solid resource guarantee for reserve growth and production increase in this exploration area,but also offering a reference for hydrocarbon exploration and development in domestic basins with similar geological conditions.