The Natural Gas Enrichment Regularity Of The 8th And The 1st Block Of The Su 59 Block In The Sulige Gas Field

As a typical tight sandstone gas reservoir, su59 block in Sulige gas field has a complex relation between gas and water, which leads to gas production with water. As a result, it has become a major obstacle to raise production. Therefore, to figure out the characteristic of gas-water distribution and summarize the pattern of gas enrichments of early palaeozoic is the primary purpose.On the basis of previous studies, He8 Member can be subdivided into four little layers: H81, H82, H83, H84 and Shan1 Member can be subdivided into three little layers:S11,S12 and S13 in combination with logging and core data. All layers belong to meandering deltaic plain except for H84, which is braid-river delta plain subfacies. As shown in well profile, multi-stacked channels often appear in channel sand body of different layers. The multi-stacked directly results in one more upward-fining sequences, which leads to the obvious vertical anisotropy. Microstructures in there searched region including nose structure, anticline, syncline and sag. Microstructures have some influence on gas accumulation, and it concrete manifestation and it concrete manifestation for the gas-generation in higher structure and water-generation in lower structure.It established judgment methodand the corresponding relation of physical properties and electrical for mud, sand and gravel of He8 Member and Shanl Member based on "four-property relationship". Besides, physical property lower limit of He8 Member and Shanl Member are received. For He8 Member, if porous reaches 4% and permeability reaches 0.01mD, the sandstones are gas-bearing. As for Shanl Member, the porous lower limit is 2% and the permeability lower limit is 0.01mD. At the same time, we found that particle size of quartz lithic sandstone is larger than lithic sandstone. Then the physical property of quartz lithic sandstone is better than lithic sandstone, and also, the gas-water distribution of quartz lithic sandstone is more simple than lithic sandstone.The gas and water formation could be discriminate based on the discriminate model according to four-property relationship research. Then the chart method and total hydrocarbon standardization methods could be applied to water and gas formation identification. After that the map of water and gas distribution was made.Reference to previous research results, and integrate all the above results, the gas accumulation in the study area are mainly affected by the lithology and sand body structure, the strength of the hydrocarbon of hydrocarbon source rock, the influence of tectonic movement. Finally, based on the enrichment regularity of favorable area is forecasted.