陕北斜坡东部低渗透储集层的连片分析及其应用

根据240口勘探开发井的统计结果对AS油田杏河、侯市、王窑三井区长6特低渗透非均匀沉积砂体规模连片关系进行了分析.给出了长61121、长61122、长61123、长612、长622和长63六个小层的砂层、渗砂层、油层(含水油层)和纯油层的井数、厚度、平均厚度和视连片率的统计结果.指出主力油层长61122具有很好的连片性,其砂层和油层的视连片率分别达到88.3%和63.3%.还给出了6个小层的油水层和油层的钻遇率.其中长61122小层的油层井数、油层层数和油层厚度的钻遇率都达到60%～70%.本文的结果可以为该区的开发决策提供可靠的地质依据.

Study on the continuity of the extra- low permeability reservoir of Chang6 in the east of North Shaanxi Slope and its application

The continuity of the Chang6 extra-low permeability sand -body in the t hree wellblocks of Xinghe, Houshi and Wangyao in Ansai Oilfield is studied acco rding to the statistical data of 240 exploration wells and development wells. Th e well number, the total thickness, the average thickness and the apparent conti nuity ratio of sand layer, permeable sand layer, oil-bearing aquifer and oil-b ea ring formation of Chang6_1~(1-1), Chang6_1~(1-2), Chang6_1~(1-3), Chang6_1~2, Chang6_2~2 and Cha ng_6~3 are presented in one statistical table. The major reservoir of Chang6_ 1~(1-2)in the studied area has good continuity, the apparent continuity ra tios of its sa nd layer and oil-bearing formation are 88.3% and 63.3% separately. The drilling - encounter ratios of oil-bearing aquifer and oil-bearing formation of them base d on well number, stratum number and stratum thickness separately are also present ed in the other statistical table. The drilling-encounter ratios of Chang6_1~ (1-2) a ll reach to 60%～70%. The results in this paper can provide reliable geological basis for the development decision-making in the studied area.