The PetroChina has continuously made a number of major oil and gas discoveries and implemented a number of large-scale reserves in the field of deep-ultradeep clastic rocks,demonstrating the huge exploration potential in this field.Based on the exploration progress and geological cognition obtained,combined with the characteristics of onshore oil and gas basins in China,the deep-ultradeep clastic rock domain could be divided into three types:foreland basin,graben basin and depression basin,and the scale distribution of deep effective source rocks and the characteristics of riching in oil especially gas are revealed.The new recognitions that four formation mechanisms control the development of deep high-quality clastic reservoirs and deep reservoir-forming factors are well configured are also proposed from the research.Combining the basic geological understanding of deep clastic rocks,source rock and resource potential,effective reservoir distribution and reservoir-controlling factors of deep clastic rocks,four major directions for future research are proposed:(1)Strengthen research on deep geological structure,sedimentary filling and tectonic evolution,determine favorable reservoir combination and their plane distribution.(2)Strengthen the evaluation of main hydrocarbon source rock distribution,and objectively estimate the deep resource potential,then determine the favorable resource enrichment area.(3)Strengthen researches on the formation,preservation mechanism and distribution law of different types of reservoirs,and implement the vertical layer distribution and plane distribution of large-scale effective reservoirs.(4)Strengthen analysis of the control factors,preservation mechanism,and trap evaluation of oil and gas reservoirs,implement favorable zones from priority areas,and determine drilling targets.Based on the distribution characteristics of the remaining resources and exploration understanding,ten zones in the deep-ultradeep clastic rock field of the three types of basins are selected as the next key exploration targets.The estimated resource potential is nearly 3 billion tons of oil and over 7 trillion cubic meters of natural gas.