子北油田高台—毛家河北成藏特征与勘探方向

Reservoir-Forming Characteristics and Exploration Direction of North of Gaotai-Maojiahe Reservoir in Zibei Oilfield

为了搞清子北油田高台—毛家河北成藏特征与勘探方向,在石油地质特征认识的基础上,充分应用测试资料,开展了油藏分布特征、油气主要控制因素及油气成藏规律分析工作,同时开展了勘探有利区预测及建议。研究结果表明①主力含油层位为长4+5、长6油层组,从下部地层到上部地层水层呈增多的趋势;②油气藏在平面上呈现零散分布,毛家河北部油藏相对较为富集,高台地区油藏分布零星,整体具有面积小、层系多、连片性差等特点;③油水分布规律主要受烃源岩油源供给、构造特征、沉积相带展布特征及储层物性条件控制,体现在平面上的油水展布规律为油层基本分布在储层砂体发育、物性好、构造高部位且距离烃源岩较近的有利成藏圈闭内。以上述成果认识为指导,分析认为高台东部王家畔地区、毛家河北部马鞍山地区为今后勘探的重点区域,确定Ⅰ类有利区5个、Ⅱ类有利区12个。

In order to find out the reservoir-forming characteristics and exploration direction of north of Gaotai-Maojiahe reservoir in Zibei oilfield,based on the understanding of petroleum geological characteristics,and with the full use of test data,the analysis of reservoir distribution characteristics,main control factors of oil and gas and the rules of oil and gas reservoir-forming has been carried out,and the prediction and suggestions of favorable exploration areas have also been carried out.The results show that:①The main oil-bearing horizons are Chang-4+5 and Chang-6 oil-bearing formations,and the water layers from the lower stratum to the upper stratum are increasing.②The oil-gas reservoirs are scattered on the plane,and the reservoirs in the north of Maojiahe are relatively rich,while those in Gaotai area are scattered,with small area,many layers and poor connectivity as a whole.③The oil-water distribution law is mainly affected by oil source supply,structural characteristics,distribution characteristics of sedimentary facies belt and control of reservoir physical conditions of source rock are reflected in the oil-water distribution law on the plane as follows:oil layer is basically distributed in favorable reservoir-forming trap with developed reservoir sand body,good physical properties,high structural position and close to source rock.Guided by the above results,it is analyzed that Wangjiapan area in the east of Gaotai and Maanshan area in the north of Maojiahe are the key exploration areas in the future,and 5 favorable areas of classⅠand 12 favorable areas of classⅡare determined.