| The Huomatu anticline zone is located in middle of the south margin of Junggar basin, located in the second row of the three Cenozoic rows of structure, subject from west to east distribution of Huoerguos anticline Manas anticline and Tugulu anticline. Because of the great hydrocarbon resource potential in this area, it has become important explore area, and the former exploration achievement shows that Huomatu anticline zone is very potential in oil and gas resources. The thickest sedimentary stratum of the area is more than 15000m, and it developed multiple source-reservoir-cap assemblage, has a great resources potential. As early as in the early years of the nineteenth century, there are many scholars came to this area to exploration and research, because of the richness of outcrop and structure and they had found many oil and gas seepage. In the middle of last century, the ground structure exploration was made here. Figured out the stratum on the surface. In the 1980s 2d seismic prospecting was used in the research area, but because of the complexity of the geological conditions in this area, the seismic network was very sparse. In 1990s, the geologist made a deeper research of this area, figured out the regional tectonic characters of the area.But because of the complexity of sedimentary environment and tectonic evolution in the research area and the limit of information, the former research in this area was limited, the research of sedimentary facies were not thoroughly, therefore this paper is very meaningfulness. For this purpose, this paper investigated the former research, observed core data, found the sedimentary facies symbol of the research area on base of petrologic feature, grain size distribution characteristic, sedimentary atructural characteristics, features of trace fossils and the characteristics of logging.Through the analysis of heavy mineral, the instability heavy mineral is dominating, it shows a feature of short source sediment. Combining the sand-stratum thickness ratio, the source from the south is dominating, the source from north-west is only influential in Shawan. The research area developed Changji, Tugulu, Manas, Kuitun four river system, and they were continuity. The lithology of Donggou group are red mudstone, sandy mudstone and sandstone and conglomerate conglomeratic sandstone interbed, it is a reservoir of this area. The lithology of Ziniquanzi group is palm red maroon sandy shale ash red sandstone conglomerate, at the bottom of the calcareous conglomerate, containing the ostracoda fossil. The Anjihaihe group is the tiniest, the lithology are grey green and dark grey mudstone argillaceous siltstone clip light grey marl shell limestone. The Shawan group’s lithology are palm red sandy, shale ash red sage green sandstone conglomerate, reddish brown gray, silty mudstone interbed and argillaceous siltstone show different thickness, the gray and brown fine sandstone, conglomeratic sandstone quartz sandstone with brown taupe mudstone and silty mudstone, local found gray paste powder sandstone. It is a complete TST and RST, and the maximum flooding surface identified in E1-2a. The Ziniquanzi group is a retrograding sequence, the development of sand body is well. The deposition of Anjihaihe group is a large-scale lake sediment, and has abnormal high pressure. It is local cap rock. The deposition of Shawan group is a process of base level descends. The sand body developed well. The sandstone of river channel in Shawan group are regional favorable reservoirs of the anticline zone.Through the recognition of facies markers, mudstone color and impotent profile, it shows that the research area has five types of sedimentary facies, there are meandering river, braided river, meandering river delta, the braided river delta and lake. The primary sedimentary face in Donggou group is meandering river, the braided river only been found in partial area. The range of basin expanded in the Ziniquanzi group, but the depth of water was still not deep, the sediment environment passed into underwater environment. It developed meandering river-delta and braided river-delta. Then the stratum evaluated continuous to Anjihaihe group, it is the finest stratum in our research area, and it develops lake sediment. The lake level raised again in Shawan group, and it develope braid river deltas front sub-facies. The main sand body in Shawan group developed in meandering river channel, the sand body in Ziniquanzi group developed in meandering river channel, braided river channel and delta front, the sand body in Anjihaihe group and Donggou group developed in delta front, and the thickness of sand bodies were thin. The favorable reservoir facies belt in the research area is underwater distributary channel, mouth bar, sand platform of shore-lake and distal bar. The lithology of the reservoir bodies in the research area is mainly of fine sandstone.Based on the results obtained, this paper got clear the sedimentary facies and the exhibition of the sand body, pointed favorable reservoir zones, and provides the theoretical basis for the following exploration and development. |
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