Development characteristics of Mianyang Changning"erosion trough"and its controlling effect on oil and gas accumulation
Mianyang Changning erosion trough in Sichuan Basin plays an important role in controlling the formation and distribution of super large Sinian-Cambrian natural gas reservoirs.Based on the latest drilling and seismic data,this paper further defines the plane distribution characteristics of Mianyang Changning erosion trough,which is deep in the north and shallow in the south,segmented in the north and opened in the south,and the profile characteristics of the erosion trough is similar to modern erosion landforms.The Mianyang and Changning erosion trough can be divided into two stages of 2th member and 4th member of the Dengying Formation,which were filled with relatively complete Lower Cambrian Maidiping Formation and Qiongzhusi Formation.The early stage of the'erosion trough'was filled by Maidiping Formation and 1-3th member of the Qiongzhusi Formation,and the late stage was filled by the 4th member of Qiongzhusi Formation.A comparative study indicates that the Mianyang-Changning erosion trough clearly controls the distribution of high-quality hydrocarbon source rocks,large-scale high-quality reservoirs,and gas fields.The erosion trough has a configuration of'upper generation and lower reservoir'and'paragenetic and lateral reservoir'within and on both sides of the trough,and Langzhong,Ziyang and Zhixinchang are the key areas for oil and gas exploration.
The Mianyang-Changning erosion troughdevelopment characteristicsOil-gas accumulation Exploration direction
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