The Stratum Feature Of Permian In Southern North China And Shale Gas Exploration Prospect

Based on the sedimentology, petroleum geochenmistry and latest research onshale gas. Integrated with use of seismic、logging、field samping core date.Studies thePermian strata in southern North China shale development of its characteristics,preliminary preciticts the favorable region of southern North China Province of shalegas.The development and evolution of basin in southern North China hasexperienced a long and complex process since the initially formed the north chinaplatform. Early Paleozoic cratonic basins-intracontinental sag basin—extensional riftbasin evolution process. Today’s Basins of southern North China are mostly Mesozoic—Cenozoic basins in the transformation of the multi—phase tectonic movement, andsuperiposed on the Late Paleozoic epicontinental sea basin.The southern North China Late Paleozoic depositional environment has gonethrough the epicontinental environment—paralic environment—inland environment.Form in the vertical corresponding to the lower part of the carbonate platformdeposition system and the Fort island deposition the delta deposition system in thecentral part the upper part of the sedimentary sequences for the river and lacustrinedepositional system. From north to south inland environment—the transition—theepeiric sea environment was distributed and developed over time.phase graduallymoved south, eventually completely converted to the inland depositionalenverionment. Southern North China Permian strata from the bottom can be dividedinto the Taiyuan Formation Shanxi Formation Lower Shihezi Formation UpperShihezi Formation and Sunjiagou Formation,dark shale usually developed in amongthe coal—bearing strata, is coastal marshand and delta sedimentary facies. Permianstrata of the southern North China today into each depression.Souther North China Permian dark shale organic type mainly dominatedkerogen type III, Mixing with a small amount of kerogen type II.Except ShangshiheziFormation,all the Formation of Permian have a high total organic carbon. Organic matter are basically at maturity—over maturity stage. Obtained from Permian shalesample test, most of sample has a high quartz content more than half of the contentgreater than50%interbeded mineral kaolinite and illite/Mongolia based clay minerals,illite and chlorite were lower,in favor of gas adsorption and reservoir fracturing.By studying of the Permian dark shale’s source rock feature, reservoirproperties gas content of southern North China, And using analogy method predictfavorable region of southern North China province of shale gas.