Natural gas prospecting foreground of the Palaeozoic in southeastern Ordos Basin

Currently,several natural gas fields have already been discovered in the middle-north of the Ordos Basin.In order to look for new prospecting replacing territory,this paper researched systematically the hydrocarbon source rock condition,reservoir rock condition,cover condition,trap type,natural gas migratory-concentration procession and conservation condition,etc.,to analyze overall the natural gas enriching and forming reservoir con-ditions of the Paleozoic in southeastern Ordos Basin,discussed its natural gas prospecting foreground,pointed out the beneficial prospecting targets and put forward concrete prospecting strategy.Express as a result that the study area gets close to hydrocarbon generation center,have high-quality coal measures hydrocarbon source rock along with big hydrocarbon generation intensity,so it has abundant gas source and the material foundation to form large scale natural gas reservoir;Evaporitic tidal flat facies of the Ordovician Majiagou Formation in this area is situated in the austral expanded range of the karstification zone,and is the optimum natural gas prospecting targets of the lower-Paleozoic;In the south of study area,there are well-developed delta deposition system sand bodies of Shanxi Formation and Xiashijezi Formation,hence this area becoming the most beneficial Neopaleozoic natural gas en-riched region;In this area,the Paleozoic develop various concealed non-structured traps,the natural gas migration and accumulation process is very beneficial and both the cover and the conservancy condition are also very good.In fine,the southeast Paleozoic of Ordos Basin has extensive natural gas prospecting foreground.