辽河坳陷东部凹陷桃园地区沙河街组岩性油气藏勘探突破及意义  

Exploration breakthrough of lithologic reservoirs of Shahejie Formation in Taoyuan area of the eastern sag of Liaohe depression and its significance

作　　者：户昶昊[1] 郭强[1] 韩宏伟[1] 张斌[1] 王建飞[1] 庚琪[1] 尹宜鹏 Hu Changhao;Guo Qiang;Han Hongwei;Zhang Bin;Wang Jianfei;Geng Qi;Yin Yipeng(PetroChina Liaohe Oilfield Company,Liaoning Panjin 124010,China)

机构地区：[1]中国石油辽河油田公司,辽宁盘锦124010

出　　处：《石油学报》2023年第3期447-457,共11页Acta Petrolei Sinica

基　　金：中国石油天然气股份有限公司科技重大专项"辽河油田千万吨稳产关键技术研究与应用"(2017E-1601)资助。

摘　　要：辽河坳陷东部凹陷经历了50多年的勘探开发,其沙河街组是重要的增储上产领域,而以往的发现主要为构造油气藏。基于构造、烃源岩、沉积储层和保存条件等多方面研究,重新认识了东部凹陷桃园地区岩性圈闭的成藏条件与成藏模式。研究结果认为:辽河坳陷东部凹陷沙河街组三段上亚段存在泥岩与煤系地层两套烃源岩,所生成的原油中有煤成油的贡献;储层中发育的NE—SW向长轴河道沉积体系向构造高部位侧向尖灭,易于形成河道透镜体圈闭;盖层稳定分布;发育互层叠置、叠合连片的规模岩性油气藏。针对辽河坳陷东部凹陷岩性油气藏部署的T28-1井在试油阶段获得产量为54.5 t/d的高产油流,取得了勘探突破,证实东部凹陷沙河街组岩性圈闭具备规模勘探潜力,开辟了煤系地层岩性油气藏勘探的新领域。The eastern sag of Liaohe depression has experienced more than 50 years of exploration and development.Shahejie Formation is an important reservoir for increasing reserves and production,but the previously discovered reservoirs are mainly structural reservoirs.Based on the study of tectonics,source rock,sedimentary reservoir and preservation conditions,a new understanding on the accumulation conditions and mode of lithologic traps in Taoyuan area of the eastern sag of Liaohe depression has been obtained.The results show as follows.There are two sets of source rocks,i.e.,mudstone and coal measure strata,in the upper submember of Member 3 of Shahejie Formation in the eastern sag of Liaohe depression,and the crude oil generated has the contribution of the coalbed.The NE-SW trending long-axis channel depositional system developed in the reservoir is pinched out laterally towards the high part of tectonic structure,which is easy to form lens-shaped channel traps.The overlying strata are distributed stably.The large-scale superimposed interbedding lithologic reservoirs are developed continuously.Well T28-1,deployed in the lithologic reservoir in the eastern sag of Liaohe depression,achieved high-yield oil flow with the yield of 54.5 t/d during the well test stage,thus making a breakthrough in exploration.This has proved that the lithologic trap of Shahejie Formation in the eastern sag of Liaohe depression has large-scale exploration potential and opened up a new field for the exploration of lithologic reservoirs in coal measure strata.

关 键 词：辽河坳陷东部凹陷 沙河街组 煤系地层 河道 岩性圈闭 储层改造 

分 类 号：TE122.3[石油与天然气工程—油气勘探]