The Study Of Structural And Stratum Of Shen 625-229 Buried Hill In Da Mintun Sag, Liaohe Oil Field

Shen 625-629 buried hill is a fracture massive oil pool of proterozoic low buried hill which was discovered in Da Mintun sag. The fracture was happened in both early and late stages of Da Mintun sag. The fracture system and structural configuration are complex; the oil reservoir is deep; the earthquake data of buried hill is poor; the stratum structural is complex; and because the fracture oil reservoir underground is the difficult point of oil reservoir, the rule of stratum distributing and fracture distributing are difficulty to be known. Aimed at this characteristic, compared with the nearby part and combined with the regional geologic background, the stratum order was founded. Based on the study of formation bid and according to the combination rule and the thickness variety which is vertical upping in different lithology, the space distribution of fracture and lithology were forecasted and studied. Combined with the depth and attitude of stratum we studied particularly to the inner structure of proterozoic buried hill. In general, the buried hill is syncline that faced northwest. Stratum distributing is strip-shaped in landscape orientation and is samdwich in portrait. The inner faultage of buried hill made the space of stratum and lithology become complex. This program used the data of three-dimensional earthquake, logging and drilling and combined with the regional geologic background to make the study of buried hill structure and rupture system. Using the data of 3700 logging, 5700 imaging logging, coring, logging, oil testing and oil extraction, It analyzed the characteristics of different lithology and oil reservoir fracture in logging, and then the matching technology that suit the logging explain and evaluation of this buried hill fracture oil reservoir was formed. Using the data of coring and longing, it described the fracture, and use it as restriction, it forecast the fracture developing place by fracture forecasting software. And then forecasted the distribution of main oil-bearing formation, selected high performance developing area and gave relevant developing suggestion. Through the study formed the exploitation technology of buried hill fracture oil reservoir and directed this kind of buried hill oil reservoir exploited in efficient way.