| According to the lithological deposit of lacking structural trap, the microfacies research is the base of reservoir assessment and prognosis . The gas concentration of shanxi group and shihezi group of permain system in suligemiao area was mainly controlled by sedimentary facies belt. Therefore, it抯 an important content in this geological research area that block out sedimentary microfacies, study the distribution of sedimentary facies and its regular between different subfacies and petroleum. Based on the synthetic study of sedimentary lithology, sedimentary texture and structure, vertical section, well log and log materials of permain system in suligemiao area, this paper divided the study area into four facies梤iver,delta,braid delta and lake .And discriminate some different subfacies and microfacies from each sedimentary facies. River facies distributed in the north of the research area. It include two subfacies梞eandering river and braid river. The meandering river was mainly developed in extensive area north of the line among su-2,su-6, tao-4, and shan-232 well. It抯 prominent feature was that river channel contindously more back and forth, which made the sand body superimposed on vertical and linked together on horizontal. Sand bodies looked like unregularily banding on horizontal and plane-convex lens on profile. Sand bodies were surrounded by fine-grained flood land deposition. Braid river was mainly developed in he-S and he-9 gas zones of shihezi group. It distributed north of the line among tao-i ,shan- 144 and shan-179 well in he-S gas zones. Braid river channel bar show plate of large width and thickness scale on profile. Scour basement is plane, compounded sand body appears extensively distributed belt. Lake deposition was only in the south of suligemiao area, and it抯 a group of shallow lake deposition. Beach sands distributed at the merge of the lake basen in some submerged gentle slope and far from entrence of river. Sand materials were brought to here by lake waves and bank flowage from others big sand bodies. Beach sand was extensively distributed liking a sheet, and almost paralleled with the bank. Deltas were the main deposition in shanxi group of lower permain, they developed south of the line among su-2, su-6, tao-4 and shan-232 well. Braid river deltas developed in abrupt slope boundary of the sea basen, in He-S and He-9 gas zones of Shihezi group in the middle permain. On foundation of lots of log materials and in-door analysis,this paper summed up the model of sedimentary of Shanxi group and Shihehezi group in Suligemiao area. During Shanxi are,sourceland in the north-Yimeng doming started to uplift, slope was rather gentle. Meandering river was developed in the north of this area, next to the south was delta planet, the last was delta front. In the early of Shihezi era ,the Yimeng doming went further uplift, the slope was becoming abrupt, the proper order from North to South was: braid river, braid river delta planet and braid river delta front. Based on the constitution and content of light minerals and heavy minerals, research on the main debris content and cathodo-luminescence characters of quartz, this article summed up the materials source of Shan- I ,Shan-2,He-8,He-9 in research area. Started from the north, many water systems were developed, the topomorphic characteristic and composition of light mineral and heavy mineral, content of debris were generally similar, which implied that elastic was taken from the same soureeland.Maturity index was gradually rising up, which showed the river systems ran... |
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