Feature of Paleozoic buried-hill reservoir in 3D zone of Saihantala sag of Erlian basin and affected factors
Chen Guang-po1,2, Xu Guo-sheng1, Zhao Zhi-gang3, Wang Hong-bo3, Dan Wei-ning3
1. Sedimentary Geologic Research Institute,Chengdu University of Technology,Chengdu City, Shaanxi Province, 601159, China;
2. Northwest Branch of China Research Institute of Exploration and Development, Lanzhou City, Gansu Province, 730020, China;
3. Research Institute of Exploration and Development, Huabei Oilfield Branch of CNPC
Abstract：The developing feature of buried-hill reservoir in basement of Saihantala sag was analyzed by using such technical data and methods as core observation, drilling, logging (conventional and imaging logging), slice identification and physical analysis, and planar prediction of reservoir was carried out by using analysis of seismic attributes. The studied results indicated that the lithology of basement in Saihantala sag is mainly the limestone and metamorphics, and space of reservoir is mainly secondary pores such as fracture and solution cave etc. The limestone buried-hill can be divided into surface karst belt, vadose karst zone and disappearing stream karst zone longitudinally; and metamorphics buried-hill can be divided into surface weathered broken zone and fracture, and karst cave developing zone. In these two lithologic buried-hills, the reserve property of superficial belt is better and planar distribution is mainly controlled by the development of faults and fracture. After calibration of drilling data and theoretical analysis, the superficial reservoir is characterized by weak amplitude and low correlation coefficient in seismic data, and interior karat is mainly characterized by strong amplitude, so using seismic attributes can effectively identify the development of buried-hill reservoir. On the basis of analyzing the feature of buried-hill reservoir, we considered that major factors controlling development of buried-hill reservoir are lithology, fault and depth to top interface of buried-hill.
陈广坡, 徐国盛, 赵志刚, 王洪波, 淡伟宁. 二连盆地赛汉塔拉凹陷三维区古生界潜山储层特征及其影响因素[J]. 石油地球物理勘探, 2009, 44(1): 64-69.
Chen Guang-po, Xu Guo-sheng, Zhao Zhi-gang, Wang Hong-bo, Dan Wei-ning. Feature of Paleozoic buried-hill reservoir in 3D zone of Saihantala sag of Erlian basin and affected factors. OGP, 2009, 44(1): 64-69.
