| Changchunling structure is one of petroleum structure detected in jilin oilfield early. The structure is a long axis anticline complicated by graben.Its biggest trap line is-200 m. Its closed Height of trap is 160 m.Its closed area of structure is about 139 k m2. A group of oil and gas wells was found in the early 20 th century in the 70 s.Because of the low test yield and poor production,there was not bigger breakthrough. Do not form large scale oil and gas,for changchunling structure was formed in sedimentary end of Mingshui group and after major migration period of oil and gas.Early in the 21 st century, According to different blocks,several appraisal well have been deployed and industrial oil flow was found.The practical problems was found at the same time some,such as: oil and gas is different in the same tectonic units of different reservoir characteristics;reservoir sand body in the plane is a zonal distribution, in the vertical sand body is superposition and forming sheet, sand body is poor stability;prediction results difference is very big, being used post-stack information by predecessor, sand body prediction results was difference from the drilling; Changchunling area sand mudstone velocity difference is small, sound wave curve of sand mudstone can not be well reflect the characteristics of the underground lithology, etc.Based on the overall development of reservoir unfavorable above problems, the researches identify the small fault again,using 3 d seismic data for the top of the fine structure interpretation of the reservoir area;Using advanced drawing software for scientific and reasonable reservoir description, the researches get further understanding to the reservoir type and oil, gas and water distribution;At the same time to carry out the corresponding prediction of oil and gas to key reservoir,the researches have important guiding significance to evaluation results of development blocks and deployment of new well, and realizing the overall utilization of reservoir. |
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