储层非均质性研究——以辽河油区J 99区块为例

Study on reservoir heterogeneity:A case of J 99 Block in Liaohe oil region

沙四段杜家台油层是辽河油区J 99区块主力储层发育段,但J 99区块属于特殊的断块油气藏,断块较破碎,油气分布规律复杂。对该区块沙四段杜家台油层沉积微相划分、平面展布特征及物性特征研究分析和综合研究表明J 99区块东北部杜家台油层发育为一套扇三角洲前缘亚相沉积,并细分出水下分支河道、河口坝、分支间湾及滨浅湖泥坪4个微相,平面相显示出砂体连续性差,以带状为主,且不同微相储层物性非均质性差异大。利用示踪剂技术对该研究区进行注采观察发现,在示踪剂注入井的周边,都分别监测出示踪剂显示,但时间、浓度与井距并不成正比关系,间接反映出该层位的不均质性。储层非均质性研究对该区下一步全面评价储层的特征,探讨砂体与构造对油气聚集的控制具有重要意义,对油田开发具有重要价值。

Dujiatai reservoir in the fourth Member of Shahejie Formation is the main reservoir development section of J99 block in Liaohe oil region,but J99 block belongs to a special fault-block hydrocarbon reservoir,with broken faulted blocks and complex oil and gas distribution law.The analysis and comprehensive study on sedimentary microfacies division,plane through-going characteristics and physical property characteristics of Es4 Dujiatai reservoir in this block indicates that Dujiatai reservoir in the northeast of J99 block develops a set of fan delta front subfacies deposition,and subdivides four microfacies:underwater distributary channel,mouth bar,interdistributary bay and coastal shallow lake mudflat.And the planar facies shows poor continuity of sand body,mainly banded,and the heterogeneity of physical property of different microfacies reservoir varies greatly.Injection-production observation of the study region using tracer technology found that tracer show was monitored around the tracer injection wells,while time and concentration were not proportional to the well spacing,indirectly reflecting the heterogeneity of the horizon.The study of reservoir heterogeneity is important to comprehensively evaluate reservoir characteristics in this region and explore the control of sand body and structure on petroleum accumulation,and is of great value for oilfield development.