Formation Mechanism of Paleokarst in Northwestern Daniudi Area of Ordos Basin
In order to study the formation mechanism of more than ten kilometers of similar faults or paleokarst landforms in Liuyangpu area,and by using the traditional method of 1 x 1 seismic data fine interpretation,coherent body technique,stratified coherent body and time slice,a large number of anticlines are salt diapir and overlying superposed structures of Taiyuan Forms-Xishihehe Formation under the control of karst ancient landforms in the study area.The syncline in the study area is mainly superimposed by gravity load under the control of karstification.The development of faults in the Carboniferous Permian in Liuyangpu gas field was mainly induced by salt diapir and karst collapse.It is revealed that the seismic phase fault in some areas is caused by the difference of paleo-geomorphic relief caused by karstification.In the late Caledonian period,large regularity of karst process began to develop,forming the early preliminary karst paleo-landform,which obviously controlled the deposition of Taiyuan Formation.In the late Caledonian karst landform,the difference of landform gradually expanded under the further action of Carboniferous karst,which further strengthened the sedimentary control of paleokarst on Taiyuan Formation.In the early Permian period,karstification gradually weakened.It is suggested that the next step should focus on strengthening the evaluation and development of in-source gas reservoirs,and select sand bodies close to the source rock strata for horizontal well drilling evaluation,which is conducive to drilling natural gas in the sand and drilling out coalbed methane in the source rock strata by deep fracturing means.
Sugeri gas fieldLiuyangpu areakarst structurediapir structure renewable energy
万方数据
维普
