| Author's Name: SONG Tao1, ZHENG Min2, HUANG Fuxi1, OUYANG Jinglin1, LI Mingpeng1,
ZENG Fandi1, FAN Jingjing1, LIU Chao1, LIU Hangyu1 |
| 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. |
