摘要:
大港探区奥陶系厚 6 0 0～ 80 0m,主要由石灰岩和白云岩组成。本区奥陶系的储层主要为岩溶储层。控制岩溶发育的主要因素有:岩性及沉积环境、水动力条件、古地形因素、断裂与裂缝发育情况和风化淋滤时间等。白云岩和石膏发育的地层有利于岩溶储层发育 ;潮坪环境是有利的储集岩发育相带。岩溶储层主要发育在距不整合面 2 0～2 0 0m范围内。加里东期古地形为南西高、北东低,水流方向是自南西向北东的 ;岩溶斜坡和不长期积水的岩溶洼地是有利的岩溶储层发育部位,尤其是岩溶斜坡。裂缝和断层发育的部位是岩溶储层有利的发育部位,裂缝和断层的走向控制岩溶带的走向。风化剥蚀时间越长,越有利于岩溶储层发育。
Abstract:
In the Dagang region, the Ordovician is 600 ~ 800 m thick and mainIy consists of Iimestones and doIostones. Karst reservoirs are deveIoped. The main controIs on karst reservoirs are ：IithoIogy, depositionaI environments, hydroIogy, an- cient Iandform, fractures and weathering time and so on. The IithoIogy composed of doIostones and gypsum is favorabIe for the deveIopment of karst reservoirs. TidaI fIat environments are favorabIe facies to deveIop karst reservoirs. Karst reservoirs are mainIy deveIoped 20 to 200 m beneath the unconformity. Beofore the Carboniferous, the Iand surface of the study area incIined from southwest to northeast, and the ground water fIew from southwest to northeast. Karst reservoir beIt formed in this time aIso trends southwest-northeast. The karst sIope and karst depression with no standing water are favorabIe for the karst reservoir deveIopment, especiaIIy the karst sIope. Karst reservoirs tend to deveIop in the pIace where fractures and fauIts are abundant, and the trend of fractures and fauIts controIs the trend of karst reservoir beIts The Ionger the weathering time, the better the karst wiIIbe deveIoped.
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